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Member "tmux-3.2a/CHANGES" (10 Jun 2021, 133040 Bytes) of package /linux/misc/tmux-3.2a.tar.gz:


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    1 CHANGES FROM 3.2 TO 3.2a
    2 
    3 * Add an "always" value for the "extended-keys" option; if set then tmux will
    4   forward extended keys to applications even if they do not request them.
    5 
    6 * Add a "mouse" terminal feature so tmux can enable the mouse on terminals
    7   where it is known to be supported even if terminfo(5) says otherwise.
    8 
    9 * Do not expand the filename given to -f so it can contain colons.
   10 
   11 * Fixes for problems with extended keys and modifiers, scroll region,
   12   source-file, crosscompiling, format modifiers and other minor issues.
   13 
   14 CHANGES FROM 3.1c TO 3.2
   15 
   16 * Add a flag to disable keys to close a message.
   17 
   18 * Permit shortcut keys in buffer, client, tree modes to be configured with a
   19   format (-K flag to choose-buffer, choose-client, choose-tree).
   20 
   21 * Add a current_file format for the config file being parsed.
   22 
   23 * When display-message used in config file, show the message after the config
   24   file finishes.
   25 
   26 * Add client-detached notification in control mode.
   27 
   28 * Improve performance of format evaluation.
   29 
   30 * Make jump command support UTF-8 in copy mode.
   31 
   32 * Support X11 colour names and other colour formats for OSC 10 and 11.
   33 
   34 * Add "pipe" variants of "copy-pipe" commands which do not copy.
   35 
   36 * Include "focused" in client flags.
   37 
   38 * Send Unicode directional isolate characters around horizontal pane borders if
   39   the terminal supports UTF-8 and an extension terminfo(5) capability "Bidi" is
   40   present.
   41 
   42 * Add a -S flag to new-window to make it select the existing window if one
   43   with the given name already exists rather than failing with an error.
   44 
   45 * Add a format modifier to check if a window or session name exists (N/w or
   46   N/s).
   47 
   48 * Add compat clock_gettime for older macOS.
   49 
   50 * Add a no-detached choice to detach-on-destroy which detaches only if there
   51   are no other detached sessions to switch to.
   52 
   53 * Add rectangle-on and rectangle-off copy mode commands.
   54 
   55 * Change so that window_flags escapes # automatically. A new format
   56   window_raw_flags contains the old unescaped version.
   57 
   58 * Add -N flag to never start server even if command would normally do so.
   59 
   60 * With incremental search, start empty and only repeat the previous search if
   61   the user tries to search again with an empty prompt.
   62 
   63 * Add a value for remain-on-exit that only keeps the pane if the program
   64   failed.
   65 
   66 * Add a -C flag to run-shell to use a tmux command rather than a shell command.
   67 
   68 * Do not list user options with show-hooks.
   69 
   70 * Remove current match indicator in copy mode which can't work anymore since we
   71   only search the visible region.
   72 
   73 * Make synchronize-panes a pane option and add -U flag to set-option to unset
   74   an option on all panes.
   75 
   76 * Make replacement of ##s consistent when drawing formats, whether followed by
   77   [ or not. Add a flag (e) to the q: format modifier to double up #s.
   78 
   79 * Add -N flag to display-panes to ignore keys.
   80 
   81 * Change how escaping is processed for formats so that ## and # can be used in
   82   styles.
   83 
   84 * Add a 'w' format modifier for string width.
   85 
   86 * Add support for Haiku.
   87 
   88 * Expand menu and popup -x and -y as formats.
   89 
   90 * Add numeric comparisons for formats.
   91 
   92 * Fire focus events even when the pane is in a mode.
   93 
   94 * Add -O flag to display-menu to not automatically close when all mouse buttons
   95   are released.
   96 
   97 * Allow fnmatch(3) wildcards in update-environment.
   98 
   99 * Disable nested job expansion so that the result of #() is not expanded again.
  100 
  101 * Use the setal capability as well as (tmux's) Setulc.
  102 
  103 * Add -q flag to unbind-key to hide errors.
  104 
  105 * Allow -N without a command to change or add a note to an existing key.
  106 
  107 * Add a -w flag to set- and load-buffer to send to clipboard using OSC 52.
  108 
  109 * Add -F to set-environment and source-file.
  110 
  111 * Allow colour to be spelt as color in various places.
  112 
  113 * Add n: modifier to get length of a format.
  114 
  115 * Respond to OSC colour requests if a colour is available.
  116 
  117 * Add a -d option to display-message to set delay.
  118 
  119 * Add a way for control mode clients to subscribe to a format and be notified
  120   of changes rather than having to poll.
  121     
  122 * Add some formats for search in copy mode (search_present, search_match).
  123 
  124 * Do not wait on shutdown for commands started with run -b.
  125 
  126 * Add -b flags to insert a window before (like the existing -a for after) to
  127   break-pane, move-window, new-window.
  128 
  129 * Make paste -p the default for ].
  130 
  131 * Add support for pausing a pane when the output buffered for a control mode
  132   client gets too far behind. The pause-after flag with a time is set on the
  133   pane with refresh-client -f and a paused pane may be resumed with
  134   refresh-client -A.
  135 
  136 * Allow strings in configuration files to span multiple lines - newlines and
  137   any leading whitespace are removed, as well as any following comments that
  138   couldn't be part of a format. This allows long formats or other strings to be
  139   annotated and indented.
  140 
  141 * Instead of using a custom parse function to process {} in configuration
  142   files, treat as a set of statements the same as outside {} and convert back
  143   to a string as the last step. This means the rules are consistent inside and
  144   outside {}, %if and friends work at the right time, and the final result
  145   isn't littered with unnecessary newlines.
  146 
  147 * Add support for extended keys - both xterm(1)'s CSI 27 ~ sequence and the
  148   libtickit CSI u sequence are accepted; only the latter is output. tmux will
  149   only attempt to use these if the extended-keys option is on and it can detect
  150   that the terminal outside supports them (or is told it does with the
  151   "extkeys" terminal feature).
  152 
  153 * Add an option to set the pane border lines style from a choice of single
  154   lines (ACS or UTF-8), double or heavy (UTF-8), simple (plain ASCII) or number
  155   (the pane numbers). Lines that won't work on a non-UTF-8 terminal are
  156   translated back into ACS when they are output.
  157 
  158 * Make focus events update the latest client (like a key press).
  159 
  160 * Store UTF-8 characters differently to reduce memory use.
  161 
  162 * Fix break-pane -n when only one pane in the window.
  163 
  164 * Instead of sending all data to control mode clients as fast as possible, add
  165   a limit of how much data will be sent to the client and try to use it for
  166   panes with some degree of fairness.
  167 
  168 * Add an active-pane client flag (set with attach-session -f, new-session -f
  169   or refresh-client -f). This allows a client to have an independent active
  170   pane for interactive use (the window client pane is still used for many
  171   things however).
  172 
  173 * Add a mark to copy mode, this is set with the set-mark command (bound to X)
  174   and appears with the entire line shown using copy-mode-mark-style and the
  175   marked character in reverse. The jump-to-mark command (bound to M-x) swaps
  176   the mark and the cursor positions.
  177 
  178 * Add a -D flag to make the tmux server run in the foreground and not as a
  179   daemon.
  180 
  181 * Do not loop forever in copy mode when search finds an empty match.
  182 
  183 * Fix the next-matching-bracket logic when using vi(1) keys.
  184 
  185 * Add a customize mode where options may be browsed and changed, includes
  186   adding a brief description of each option. Bound to C-b C by default.
  187 
  188 * Change message log (C-b ~) so there is one for the server rather than one per
  189   client and it remains after detach, and make it useful by logging every
  190   command.
  191 
  192 * Add M-+ and M-- to tree mode to expand and collapse all.
  193 
  194 * Change the existing client flags for control mode to apply for any client,
  195   use the same mechanism for the read-only flag and add an ignore-size flag.
  196 
  197   refresh-client -F has become -f (-F stays for backwards compatibility) and
  198   attach-session and switch-client now have -f flags also. A new format
  199   client_flags lists the flags and is shown by list-clients by default.
  200 
  201   This separates the read-only flag from "ignore size" behaviour (new
  202   ignore-size) flag - both behaviours are useful in different circumstances.
  203 
  204   attach -r and switchc -r remain and set or toggle both flags together.
  205 
  206 * Store and restore cursor position when copy mode is resized.
  207 
  208 * Export TERM_PROGRAM and TERM_PROGRAM_VERSION like various other terminals.
  209 
  210 * Add formats for after hook command arguments: hook_arguments with all the
  211   arguments together; hook_argument_0, hook_argument_1 and so on with
  212   individual arguments; hook_flag_X if flag -X is present; hook_flag_X_0,
  213   hook_flag_X_1 and so on if -X appears multiple times.
  214 
  215 * Try to search the entire history first for up to 200 ms so a search count can
  216   be shown. If it takes too long, search the visible text only.
  217 
  218 * Use VIS_CSTYLE for paste buffers also (show \012 as \n).
  219 
  220 * Change default formats for tree mode, client mode and buffer mode to be more
  221   compact and remove some clutter.
  222 
  223 * Add a key (e) in buffer mode to open the buffer in an editor. The buffer
  224   contents is updated when the editor exits.
  225 
  226 * Add -e flag for new-session to set environment variables, like the same flag
  227   for new-window.
  228 
  229 * Improve search match marking in copy mode. Two new options
  230   copy-mode-match-style and copy-mode-current-match-style to set the style for
  231   matches and for the current match respectively. Also a change so that if a
  232   copy key is pressed with no selection, the current match (if any) is copied.
  233 
  234 * Sanitize session names like window names instead of forbidding invalid ones.
  235 
  236 * Check if the clear terminfo(5) capability starts with CSI and if so then
  237   assume the terminal is VT100-like, rather than relying on the XT capability.
  238 
  239 * Improve command prompt tab completion and add menus both for strings and -t
  240   and -s (when used without a trailing space). command-prompt has additional
  241   flags for only completing a window (-W) and a target (-T), allowing C-b ' to
  242   only show windows and C-b . only targets.
  243 
  244 * Change all the style options to string options so they can support formats.
  245   Change pane-border-active-style to use this to change the border colour when
  246   in a mode or with synchronize-panes on. This also implies a few minor changes
  247   to existing behaviour:
  248 
  249   - set-option -a with a style option automatically inserts a comma between the
  250     old value and appended text.
  251 
  252   - OSC 10 and 11 no longer set the window-style option, instead they store the
  253     colour internally in the pane data and it is used as the default when the
  254     option is evaluated.
  255 
  256   - status-fg and -bg now override status-style instead of the option values
  257     being changed.
  258 
  259 * Add extension terminfo(5) capabilities for margins and focus reporting.
  260 
  261 * Try $XDG_CONFIG_HOME/tmux/tmux.conf as well as ~/.config/tmux/tmux.conf for
  262   configuration file (the search paths are in TMUX_CONF in Makefile.am).
  263 
  264 * Remove the DSR 1337 iTerm2 extension and replace by the extended device
  265   attributes sequence (CSI > q) supported by more terminals.
  266 
  267 * Add a -s flag to copy-mode to specify a different pane for the source
  268   content. This means it is possible to view two places in a pane's history at
  269   the same time in different panes, or view the history while still using the
  270   pane. Pressing r refreshes the content from the source pane.
  271 
  272 * Add an argument to list-commands to show only a single command.
  273 
  274 * Change copy mode to make copy of the pane history so it does not need to
  275   freeze the pane.
  276 
  277 * Restore pane_current_path format from portable tmux on OpenBSD.
  278 
  279 * Wait until the initial command sequence is done before sending a device
  280   attributes request and other bits that prompt a reply from the terminal. This
  281   means that stray replies are not left on the terminal if the command has
  282   attached and then immediately detached and tmux will not be around to receive
  283   them.
  284 
  285 * Add a -f filter argument to the list commands like choose-tree.
  286 
  287 * Move specific hooks for panes to pane options and windows for window options
  288   rather than all hooks being session options. These hooks are now window options:
  289 
  290   window-layout-changed
  291   window-linked
  292   window-pane-changed
  293   window-renamed
  294   window-unlinked
  295 
  296   And these are now pane options:
  297 
  298   pane-died
  299   pane-exited
  300   pane-focus-in
  301   pane-focus-out
  302   pane-mode-changed
  303   pane-set-clipboard
  304 
  305   Any existing configurations using these hooks on a session rather than
  306   globally (that is, set-hook or set-option without -g) may need to be changed.
  307 
  308 * Show signal names when a process exits with remain-on-exit on platforms which
  309   have a way to get them.
  310 
  311 * Start menu with top item selected if no mouse and use mode-style for the
  312   selected item.
  313 
  314 * Add a copy-command option and change copy-pipe and friends to pipe to it if
  315   used without arguments, allows all the default copy key bindings to be
  316   changed to pipe with one option rather than needing to change each key
  317   binding individually.
  318 
  319 * Tidy up the terminal detection and feature code and add named sets of
  320   terminal features, each of which are defined in one place and map to a
  321   builtin set of terminfo(5) capabilities. Features can be specified based on
  322   TERM with a new terminal-features option or with the -T flag when running
  323   tmux. tmux will also detect a few common terminals from the DA and DSR
  324   responses.
  325 
  326   This is intended to make it easier to configure tmux's use of terminfo(5)
  327   even in the presence of outdated ncurses(3) or terminfo(5) databases or for
  328   features which do not yet have a terminfo(5) entry. Instead of having to grok
  329   terminfo(5) capability names and what they should be set to in the
  330   terminal-overrides option, the user can hopefully just give tmux a feature
  331   name and let it do the right thing.
  332 
  333   The terminal-overrides option remains both for backwards compatibility and to
  334   allow tweaks of individual capabilities.
  335 
  336 * Support mintty's application escape sequence (means tmux doesn't have to
  337   delay to wait for Escape, so no need to reduce escape-time when using
  338   mintty).
  339 
  340 * Change so main-pane-width and height can be given as a percentage.
  341 
  342 * Support for the iTerm2 synchronized updates feature (allows the terminal to
  343   avoid unnecessary drawing while output is still in progress).
  344 
  345 * Make the mouse_word and mouse_line formats work in copy mode and enable the
  346   default pane menu in copy mode.
  347 
  348 * Add a -T flag to resize-pane to trim lines below the cursor, moving lines out
  349   of the history.
  350 
  351 * Add a way to mark environment variables as "hidden" so they can be used by
  352   tmux (for example in formats) but are not set in the environment for new
  353   panes. set-environment and show-environment have a new -h flag and there is a
  354   new %hidden statement for the configuration file.
  355 
  356 * Change default position for display-menu -x and -y to centre rather than top
  357   left.
  358 
  359 * Add support for per-client transient popups, similar to menus but which are
  360   connected to an external command (like a pane). These are created with new
  361   command display-popup.
  362 
  363 * Change double and triple click bindings so that only one is fired (previously
  364   double click was fired on the way to triple click). Also add default double
  365   and triple click bindings to copy the word or line under the cursor and
  366   change the existing bindings in copy mode to do the same.
  367 
  368 * Add a default binding for button 2 to paste.
  369 
  370 * Add -d flag to run-shell to delay before running the command and allow it to
  371   be used without a command so it just delays.
  372 
  373 * Add C-g to cancel command prompt with vi keys as well as emacs, and q in
  374   command mode.
  375 
  376 * When the server socket is given with -S, create it with umask 177 instead of
  377   117 (because it may not be in a safe directory like the default directory in
  378   /tmp).
  379 
  380 * Add a copy-mode -H flag to hide the position marker in the top right.
  381 
  382 * Add number operators for formats (+, -, *, / and m),
  383 
  384 CHANGED FROM 3.1b TO 3.1c
  385 
  386 * Do not write after the end of the array and overwrite the stack when
  387   colon-separated SGR sequences contain empty arguments.
  388 
  389 CHANGES FROM 3.1a TO 3.1b
  390 
  391 * Fix build on systems without sys/queue.h.
  392 
  393 * Fix crash when allow-rename is on and an empty name is set.
  394 
  395 CHANGES FROM 3.1 TO 3.1a
  396 
  397 * Do not close stdout prematurely in control mode since it is needed to print
  398   exit messages. Prevents hanging when detaching with iTerm2.
  399 
  400 CHANGES FROM 3.0a TO 3.1
  401 
  402 * Only search the visible part of the history when marking (highlighting)
  403   search terms. This is much faster than searching the whole history and solves
  404   problems with large histories. The count of matches shown is now the visible
  405   matches rather than all matches.
  406 
  407 * Search using regular expressions in copy mode. search-forward and
  408   search-backward use regular expressions by default; the incremental versions
  409   do not.
  410 
  411 * Turn off mouse mode 1003 as well as the rest when exiting.
  412 
  413 * Add selection_active format for when the selection is present but not moving
  414   with the cursor.
  415 
  416 * Fix dragging with modifier keys, so binding keys such as C-MouseDrag1Pane and
  417   C-MouseDragEnd1Pane now work.
  418 
  419 * Add -a to list-keys to also list keys without notes with -N.
  420 
  421 * Do not jump to next word end if already on a word end when selecting a word;
  422   fixes select-word with single character words and vi(1) keys.
  423 
  424 * Fix top and bottom pane calculation with pane border status enabled.
  425 
  426 * Add support for adding a note to a key binding (with bind-key -N) and use
  427   this to add descriptions to the default key bindings. A new -N flag to
  428   list-keys shows key bindings with notes. Change the default ? binding to use
  429   this to show a readable summary of keys. Also extend command-prompt to return
  430   the name of the key pressed and add a default binding (/) to show the note
  431   for the next key pressed.
  432 
  433 * Add support for the iTerm2 DSR 1337 sequence to get the terminal version.
  434 
  435 * Treat plausible but invalid keys (like C-BSpace) as literal like any other
  436   unrecognised string passed to send-keys.
  437 
  438 * Detect iTerm2 and enable use of DECSLRM (much faster with horizontally split
  439   windows).
  440 
  441 * Add -Z to default switch-client command in tree mode.
  442 
  443 * Add ~ to quoted characters for %%%.
  444 
  445 * Document client exit messages in the manual page.
  446 
  447 * Do not let read-only clients limit the size, unless all clients are
  448   read-only.
  449 
  450 * Add a number of new formats to inspect what sessions and clients a window is
  451   present or active in.
  452 
  453 * Change file reading and writing to go through the client if necessary. This
  454   fixes commands like "tmux loadb /dev/fd/X". Also modify source-file to
  455   support "-" for standard input, like load-buffer and save-buffer.
  456 
  457 * Add ~/.config/tmux/tmux.conf to the default search path for configuration
  458   files.
  459 
  460 * Bump the escape sequence timeout to five seconds to allow for longer
  461   legitimate sequences.
  462 
  463 * Make a best effort to set xpixel and ypixel for each pane and add formats for
  464   them.
  465 
  466 * Add push-default to status-left and status-right in status-format[0].
  467 
  468 * Do not clear search marks on cursor movement with vi(1) keys.
  469 
  470 * Add p format modifier for padding to width and allow multiple substitutions
  471   in a single format.
  472 
  473 * Add -f for full size to join-pane (like split-window).
  474 
  475 * Do not use bright when emulating 256 colours on an 8 colour terminal because
  476   it is also bold on some terminals.
  477 
  478 * Make select-pane -P set window-active-style also to match previous behaviour.
  479 
  480 * Do not truncate list-keys output.
  481 
  482 * Turn automatic-rename back on if the \033k rename escape sequence is used
  483   with an empty name.
  484 
  485 * Add support for percentage sizes for resize-pane ("-x 10%"). Also change
  486   split-window and join-pane -l to accept similar percentages and deprecate the
  487   -p flag.
  488 
  489 * Add -F flag to send-keys to expand formats in search-backward and forward
  490   copy mode commands and copy_cursor_word and copy_cursor_line formats for word
  491   and line at cursor in copy mode. Use for default # and * binding with vi(1)
  492   keys.
  493 
  494 * Add formats for word and line at cursor position in copy mode.
  495 
  496 * Add formats for cursor and selection position in copy mode.
  497 
  498 * Support all the forms of RGB colour strings in OSC sequences rather than
  499   requiring two digits.
  500 
  501 * Limit lazy resize to panes in attached sessions only.
  502 
  503 * Add an option to set the key sent by backspace for those whose system uses ^H
  504   rather than ^?.
  505 
  506 * Change new-session -A without a session name (that is, no -s option also) to
  507   attach to the best existing session like attach-session rather than a new
  508   one.
  509 
  510 * Add a "latest" window-size option which tries to size windows based on the
  511   most recently used client. This is now the default.
  512 
  513 * Add simple support for OSC 7 (result is available in the pane_path format).
  514 
  515 * Add push-default and pop-default for styles which change the colours and
  516   attributes used for #[default]. These are used in status-format to restore
  517   the behaviour of window-status-style being the default for
  518   window-status-format.
  519 
  520 * Add window_marked_flag.
  521 
  522 * Add cursor-down-and-cancel in copy mode.
  523 
  524 * Default to previous search string for search-forward and search-backward.
  525 
  526 * Add -Z flag to rotate-window, select-pane, swap-pane, switch-client to
  527   preserve zoomed state.
  528 
  529 * Add -N to capture-pane to preserve trailing spaces.
  530 
  531 * Add reverse sorting in tree, client and buffer modes.
  532 
  533 CHANGES FROM 3.0 TO 3.0a
  534 
  535 * Do not require REG_STARTEND.
  536 
  537 * Respawn panes or windows correctly if default-command is set.
  538 
  539 * Add missing option for after-kill-pane hook.
  540 
  541 * Fix for crash with a format variable that doesn't exist.
  542 
  543 * Do not truncate list-keys output on some platforms.
  544 
  545 * Do not crash when restoring a layout with only one pane.
  546 
  547 CHANGES FROM 2.9 TO 3.0
  548 
  549 * Workaround invalid layout strings generated by older tmux versions and add
  550   some additional sanity checks
  551 
  552 * xterm 348 now disables margins when resized, so send DECLRMM again after
  553   resize.
  554 
  555 * Add support for the SD (scroll down) escape sequence.
  556 
  557 * Expand arguments to C and s format modifiers to match the m modifier.
  558 
  559 * Add support for underscore colours (Setulc capability must be added with
  560   terminal-overrides as described in tmux(1)).
  561 
  562 * Add a "fill" style attribute for the fill colour of the drawing area (where
  563   appropriate).
  564 
  565 * New -H flag to send-keys to send literal keys.
  566 
  567 * Format variables for pane mouse modes (mouse_utf8_flag and mouse_sgr_flag)
  568   and for origin mode (origin_flag).
  569 
  570 * Add -F to refresh-client for flags for control mode clients, only one flag
  571   (no-output) supported at the moment.
  572 
  573 * Add a few vi(1) keys for menus.
  574 
  575 * Add pane options, set with set-option -p and displayed with show-options -p.
  576   Pane options inherit from window options (so every pane option is also
  577   a window option). The pane style is now configured by setting window-style
  578   and window-active-style in the pane options; select-pane -P and -g now change
  579   the option but are no longer documented.
  580 
  581 * Do not document set-window-option and show-window-options. set-option -w and
  582   show-options -w should be used instead.
  583 
  584 * Add a -A flag to show-options to show parent options as well (they are marked
  585   with a *).
  586 
  587 * Resize panes lazily - do not resize unless they are in an attached, active
  588   window.
  589 
  590 * Add regular expression support for the format search, match and substitute
  591   modifiers and make them able to ignore case. find-window now accepts -r to
  592   use regular expressions.
  593 
  594 * Do not use $TMUX to find the session because for windows in multiple sessions
  595   it is wrong as often as it is right, and for windows in one session it is
  596   pointless. Instead use TMUX_PANE if it is present.
  597 
  598 * Do not always resize the window back to its original size after applying a
  599   layout, keep it at the layout size until it must be resized (for example when
  600   attached and window-size is not manual).
  601 
  602 * Add new-session -X and attach-session -x to send SIGHUP to parent when
  603   detaching (like detach-client -P).
  604 
  605 * Support for octal escapes in strings (such as \007) and improve list-keys
  606   output so it parses correctly if copied into a configuration file.
  607 
  608 * INCOMPATIBLE: Add a new {} syntax to the configuration file. This is a string
  609   similar to single quotes but also includes newlines and allows commands that
  610   take other commands as string arguments to be expressed more clearly and
  611   without additional escaping.
  612 
  613   A literal { and } or a string containing { or } must now be escaped or
  614   quoted, for example '{' and '}' instead of { or }, or 'X#{foo}' instead of
  615   X#{foo}.
  616 
  617 * New <, >, <= and >= comparison operators for formats.
  618 
  619 * Improve escaping of special characters in list-keys output.
  620 
  621 * INCOMPATIBLE: tmux's configuration parsing has changed to use yacc(1). There
  622   is one incompatible change: a \ on its own must be escaped or quoted as
  623   either \\ or '\' (the latter works on older tmux versions).
  624 
  625   Entirely the same parser is now used for parsing the configuration file
  626   and for string commands. This means that constructs previously only
  627   available in .tmux.conf, such as %if, can now be used in string commands
  628   (for example, those given to if-shell - not commands invoked from the
  629   shell, they are still parsed by the shell itself).
  630 
  631 * Add support for the overline attribute (SGR 53). The Smol capability is
  632   needed in terminal-overrides.
  633 
  634 * Add the ability to create simple menus. Introduces new command
  635   display-menu. Default menus are bound to MouseDown3 on the status line;
  636   MouseDown3 or M-MouseDown3 on panes; MouseDown3 in tree, client and
  637   buffer modes; and C-b < and >.
  638 
  639 * Allow panes to be empty (no command). They can be created either by piping to
  640   split-window -I, or by passing an empty command ('') to split-window. Output
  641   can be sent to an existing empty window with display-message -I.
  642 
  643 * Add keys to jump between matching brackets (emacs C-M-f and C-M-b, vi %).
  644 
  645 * Add a -e flag to new-window, split-window, respawn-window, respawn-pane to
  646   pass environment variables into the newly created process.
  647 
  648 * Hooks are now stored in the options tree as array options, allowing them to
  649   have multiple separate commands. set-hook and show-hooks remain but
  650   set-option and show-options can now also be used (show-options will only show
  651   hooks if given the -H flag). Hooks with multiple commands are run in index
  652   order.
  653 
  654 * Automatically scroll if dragging to create a selection with the mouse and the
  655   cursor reaches the top or bottom line.
  656 
  657 * Add -no-clear variants of copy-selection and copy-pipe which do not clear the
  658   selection after copying. Make copy-pipe clear the selection by default to be
  659   consistent with copy-selection.
  660 
  661 * Add an argument to copy commands to set the prefix for the buffer name, this
  662   (for example) allows buffers for different sessions to be named separately.
  663 
  664 * Update session activity on focus event.
  665 
  666 * Pass target from source-file into the config file parser so formats in %if
  667   and %endif have access to more useful variables.
  668 
  669 * Add the ability to infer an option type (server, session, window) from its
  670   name to show-options (it was already present in set-option).
  671 
  672 CHANGES FROM 2.9 TO 2.9a
  673 
  674 * Fix bugs in select-pane and the main-horizontal and main-vertical layouts.
  675 
  676 CHANGES FROM 2.8 TO 2.9
  677 
  678 * Attempt to preserve horizontal cursor position as well as vertical with
  679   reflow.
  680 
  681 * Rewrite main-vertical and horizontal and change layouts to better handle the
  682   case where all panes won't fit into the window size, reduce problems with
  683   pane border status lines and fix other bugs mostly found by Thomas Sattler.
  684 
  685 * Add format variables for the default formats in the various modes
  686   (tree_mode_format and so on) and add a -a flag to display-message to list
  687   variables with values.
  688 
  689 * Add a -v flag to display-message to show verbose messages as the format is
  690   parsed, this allows formats to be debugged
  691 
  692 * Add support for HPA (\033[`).
  693 
  694 * Add support for origin mode (\033[?6h).
  695 
  696 * No longer clear history on RIS.
  697 
  698 * Extend the #[] style syntax and use that together with previous format
  699   changes to allow the status line to be entirely configured with a single
  700   option.
  701 
  702   Now that it is possible to configure their content, enable the existing code
  703   that lets the status line be multiple lines in height. The status option can
  704   now take a value of 2, 3, 4 or 5 (as well as the previous on or off) to
  705   configure more than one line. The new status-format array option configures
  706   the format of each line, the default just references the existing status-*
  707   options, although some of the more obscure status options may be eliminated
  708   in time.
  709 
  710   Additions to the #[] syntax are: "align" to specify alignment (left, centre,
  711   right), "list" for the window list and "range" to configure ranges of text
  712   for the mouse bindings.
  713 
  714   The "align" keyword can also be used to specify alignment of entries in tree
  715   mode and the pane status lines.
  716 
  717 * Add E: and T: format modifiers to expand a format twice (useful to expand the
  718   value of an option).
  719 
  720 * The individual -fg, -bg and -attr options have been removed; they
  721   were superseded by -style options in tmux 1.9.
  722 
  723 * Allow more than one mode to be opened in a pane. Modes are kept on a stack
  724   and retrieved if the same mode is entered again. Exiting the active mode goes
  725   back to the previous one.
  726 
  727 * When showing command output in copy mode, call it view mode instead (affects
  728   pane_mode format).
  729 
  730 * Add -b to display-panes like run-shell.
  731 
  732 * Handle UTF-8 in word-separators option.
  733 
  734 * New "terminal" colour allowing options to use the terminal default colour
  735   rather than inheriting the default from a parent option.
  736 
  737 * Do not move the cursor in copy mode when the mouse wheel is used.
  738 
  739 * Use the same working directory rules for jobs as new windows rather than
  740   always starting in the user's home.
  741 
  742 * Allow panes to be one line or column in size.
  743 
  744 * Go to last line when goto-line number is out of range in copy mode.
  745 
  746 * Yank previously cut text if any with C-y in the command prompt, only use the
  747   buffer if no text has been cut.
  748 
  749 * Add q: format modifier to quote shell special characters.
  750 
  751 * Add StatusLeft and StatusRight mouse locations (keys such as
  752   MouseDown1StatusLeft) for the status-left and status-right areas of the
  753   status line.
  754 
  755 * Add -Z to find-window.
  756 
  757 * Support for windows larger than the client. This adds two new options,
  758   window-size and default-size, and a new command, resize-window. The
  759   force-width and force-height options and the session_width and session_height
  760   formats have been removed.
  761 
  762   The new window-size option tells tmux how to work out the size of windows:
  763   largest means it picks the size of the largest session, smallest the smallest
  764   session (similar to the old behaviour) and manual means that it does not
  765   automatically resize windows. aggressive-resize modifies the choice of
  766   session for largest and smallest as it did before.
  767 
  768   If a window is in a session attached to a client that is too small, only part
  769   of the window is shown. tmux attempts to keep the cursor visible, so the part
  770   of the window displayed is changed as the cursor moves (with a small delay,
  771   to try and avoid excess redrawing when applications redraw status lines or
  772   similar that are not currently visible).
  773 
  774   Drawing windows which are larger than the client is not as efficient as those
  775   which fit, particularly when the cursor moves, so it is recommended to avoid
  776   using this on slow machines or networks (set window-size to smallest or
  777   manual).
  778 
  779   The resize-window command can be used to resize a window manually. If it is
  780   used, the window-size option is automatically set to manual for the window
  781   (undo this with "setw -u window-size"). resize-window works in a similar way
  782   to resize-pane (-U -D -L -R -x -y flags) but also has -a and -A flags. -a
  783   sets the window to the size of the smallest client (what it would be if
  784   window-size was smallest) and -A the largest.
  785 
  786   For the same behaviour as force-width or force-height, use resize-window -x
  787   or -y.
  788 
  789   If the global window-size option is set to manual, the default-size option is
  790   used for new windows. If -x or -y is used with new-session, that sets the
  791   default-size option for the new session.
  792 
  793   The maximum size of a window is 10000x10000. But expect applications to
  794   complain and higher memory use if making a window that big. The minimum size
  795   is the size required for the current layout including borders.
  796 
  797   The refresh-client command can be used to pan around a window, -U -D -L -R
  798   moves up, down, left or right and -c returns to automatic cursor
  799   tracking. The position is reset when the current window is changed.
  800 
  801 CHANGES FROM 2.7 TO 2.8
  802 
  803 * Make display-panes block the client until a pane is chosen or it
  804   times out.
  805 
  806 * Clear history on RIS like most other terminals do.
  807 
  808 * Add an "Any" key to run a command if a key is pressed that is not
  809   bound in the current key table.
  810 
  811 * Expand formats in load-buffer and save-buffer.
  812 
  813 * Add a rectangle_toggle format.
  814 
  815 * Add set-hook -R to run a hook immediately.
  816 
  817 * Add README.ja.
  818 
  819 * Add pane focus hooks.
  820 
  821 * Allow any punctuation as separator for s/x/y not only /.
  822 
  823 * Improve resizing with the mouse (fix resizing the wrong pane in some
  824   layouts, and allow resizing multiple panes at the same time).
  825 
  826 * Allow , and } to be escaped in formats as #, and #}.
  827 
  828 * Add KRB5CCNAME to update-environment.
  829 
  830 * Change meaning of -c to display-message so the client is used if it
  831   matches the session given to -t.
  832 
  833 * Fixes to : form of SGR.
  834 
  835 * Add x and X to choose-tree to kill sessions, windows or panes.
  836 
  837 CHANGES FROM 2.6 TO 2.7
  838 
  839 * Remove EVENT_* variables from environment on platforms where tmux uses them
  840   so they do not pass on to panes.
  841 
  842 * Fixes for hooks at server exit.
  843 
  844 * Remove SGR 10 (was equivalent to SGR 0 but no other terminal seems to do
  845   this).
  846 
  847 * Expand formats in window and session names.
  848 
  849 * Add -Z flag to choose-tree, choose-client, choose-buffer to automatically
  850   zoom the pane when the mode is entered and unzoom when it exits, assuming the
  851   pane is not already zoomed. This is now part of the default key bindings.
  852 
  853 * Add C-g to exit modes with emacs keys.
  854 
  855 * Add exit-empty option to exit server if no sessions (defaults to on).
  856 
  857 * Show if a filter is present in choose modes.
  858 
  859 * Add pipe-pane -I to to connect stdin of the child process.
  860 
  861 * Performance improvements for reflow.
  862 
  863 * Use RGB terminfo(5) capability to detect RGB colour terminals (the existing
  864   Tc extension remains unchanged).
  865 
  866 * Support for ISO colon-separated SGR sequences.
  867 
  868 * Add select-layout -E to spread panes out evenly (bound to E key).
  869 
  870 * Support wide characters properly when reflowing.
  871 
  872 * Pass PWD to new panes as a hint to shells, as well as calling chdir().
  873 
  874 * Performance improvements for the various choose modes.
  875 
  876 * Only show first member of session groups in tree mode (-G flag to choose-tree
  877   to show all).
  878 
  879 * Support %else in config files to match %if; from Brad Town in GitHub issue
  880   1071.
  881 
  882 * Fix "kind" terminfo(5) capability to be S-Down not S-Up.
  883 
  884 * Add a box around the preview label in tree mode.
  885 
  886 * Show exit status and time in the remain-on-exit pane text; from Timo
  887   Boettcher in GitHub issue 1103.
  888 
  889 * Correctly use pane-base-index in tree mode.
  890 
  891 * Change the allow-rename option default to off.
  892 
  893 * Support for xterm(1) title stack escape sequences (GitHub issue 1075 from
  894   Brad Town).
  895 
  896 * Correctly remove padding cells to fix a UTF-8 display problem (GitHub issue
  897   1090).
  898 
  899 CHANGES FROM 2.5 TO 2.6, 05 October 2017
  900 
  901 * Add select-pane -T to set pane title.
  902 
  903 * Fix memory leak when lines with BCE are removed from history.
  904 
  905 * Fix (again) the "prefer unattached" behaviour of attach-session.
  906 
  907 * Reorder how keys are checked to allow keys to be specified that have a
  908   leading escape. GitHub issue 1048.
  909 
  910 * Support REP escape sequence (\033[b).
  911 
  912 * Run alert hooks based on options rather than always, and allow further bells
  913   even if there is an existing bell.
  914 
  915 * Add -d flag to display-panes to override display-panes-time.
  916 
  917 * Add selection_present format when in copy mode (allows key bindings that do
  918   something different if there is a selection).
  919 
  920 * Add pane_at_left, pane_at_right, pane_at_top and pane_at_bottom formats.
  921 
  922 * Make bell, activity and silence alerting more consistent by: removing the
  923   bell-on-alert option; adding activity-action and silence-action options with
  924   the same possible values as the existing bell-action; adding a "both" value
  925   for the visual-bell, visual-activity and visual-silence options to trigger
  926   both a bell and a message.
  927 
  928 * Add a pane_pipe format to show if pipe-pane is active.
  929 
  930 * Block signals between forking and resetting signal handlers so that the
  931   libevent signal handler doesn't get called in the child and incorrectly write
  932   into the signal pipe that it still shares with the parent. GitHub issue 1001.
  933 
  934 * Allow punctuation in pane_current_command.
  935 
  936 * Add -c for respawn-pane and respawn-window.
  937 
  938 * Wait for any remaining data to flush when a pane is closed while pipe-pane is
  939   in use.
  940 
  941 * Fix working out current client with no target. GitHub issue 995.
  942 
  943 * Try to fallback to C.UTF-8 as well as en_US.UTF-8 when looking for a UTF-8
  944   locale.
  945 
  946 * Add user-keys option for user-defined key escape sequences (mapped to User0
  947   to User999 keys).
  948 
  949 * Add pane-set-clipboard hook.
  950 
  951 * FAQ file has moved out of repository to online.
  952 
  953 * Fix problem with high CPU usage when a client dies unexpectedly. GitHub issue
  954   941.
  955 
  956 * Do a dance on OS X 10.10 and above to return tmux to the user namespace,
  957   allowing access to the clipboard.
  958 
  959 * Do not allow escape sequences which expect a specific terminator (APC, DSC,
  960   OSC) to wait for forever - use a small timeout. This reduces the chance of
  961   the pane locking up completely when sent garbage (cat /dev/random or
  962   similar).
  963 
  964 * Support SIGUSR2 to toggle logging on a running server, also generate the
  965   "out" log file with -vv not -vvvv.
  966 
  967 * Make set-clipboard a three state option: on (tmux both sends to outside
  968   terminal and accepts from applications inside); external (tmux sends outside
  969   but does not accept inside); and off.
  970 
  971 * Fix OSC 4 palette setting for bright foreground colours. GitHub issue 954.
  972 
  973 * Use setrgbf and setrgbb terminfo(5) capabilities to set RGB colours, if they
  974   are available. (Tc is still supported as well.)
  975 
  976 * Fix redrawing panes when they are resized several times but end up with the
  977   size unchanged (for example, splitw/resizep -Z/breakp).
  978 
  979 * Major rewrite of choose mode. Now includes preview, sorting, searching and
  980   tagging; commands that can be executed directly from the mode (for example,
  981   to delete one or more buffers); and filtering in tree mode.
  982 
  983 * choose-window and choose-session are now aliases of choose-tree (in the
  984   command-alias option).
  985 
  986 * Support OSC 10 and OSC 11 to set foreground and background colours.
  987 
  988 * Check the U8 capability to determine whether to use UTF-8 line drawing
  989   characters for ACS.
  990 
  991 * Some missing notifications for layout changes.
  992 
  993 * Control mode clients now do not affect session sizes until they issue
  994   refresh-client -C. new-session -x and -y works with control clients even if
  995   the session is not detached.
  996 
  997 * All new sessions that are unattached (whether with -d or started with no
  998   terminal) are now created with size 80 x 24. Whether the status line is on or
  999   off does not affect the size of new sessions until they are attached.
 1000 
 1001 * Expand formats in option names and add -F flag to expand them in option values.
 1002 
 1003 * Remember the search string for a pane even if copy mode is exited and entered
 1004   again.
 1005 
 1006 * Some further BCE fixes (scroll up, reverse index).
 1007 
 1008 * Improvements to how terminals are cleared (entirely or partially).
 1009 
 1010 CHANGES FROM 2.4 TO 2.5, 09 May 2017
 1011 
 1012 * Reset updated flag when restarting #() command so that new output is properly
 1013   recognised. GitHub issue 922.
 1014 
 1015 * Fix ECH with a background colour.
 1016 
 1017 * Do not rely on the terminal not moving the cursor after DL or EL.
 1018 
 1019 * Fix send-keys and send-prefix in copy-mode (so C-b C-b works). GitHub issue
 1020   905.
 1021 
 1022 * Set the current pane for rotate-window so it works in command sequences.
 1023 
 1024 * Add pane_mode format.
 1025 
 1026 * Differentiate M-Up from Escape+Up when possible (that is, in terminals with
 1027   xterm(1) style function keys). GitHub issue 907.
 1028 
 1029 * Add session_stack and window_stack_index formats.
 1030 
 1031 * Some new control mode notifications and corresponding hooks:
 1032   pane-mode-changed, window-pane-changed, client-session-changed,
 1033   session-window-changed.
 1034 
 1035 * Format pane_search_string for last search term while in copy mode (useful
 1036   with command-prompt -I).
 1037 
 1038 * Fix a problem with high CPU usage and multiple clients with #(). GitHub issue
 1039   889.
 1040 
 1041 * Fix UTF-8 combining characters in column 0.
 1042 
 1043 * Fix reference counting so that panes are properly destroyed and their
 1044   processes killed.
 1045 
 1046 * Clamp SU (CSI S) parameter to work around a bug in Konsole.
 1047 
 1048 * Tweak line wrapping in full width panes to play more nicely with terminal
 1049   copy and paste.
 1050 
 1051 * Fix when we emit SGR 0 in capture-pane -e.
 1052 
 1053 * Do not change TERM until after config file parsing has finished, so that
 1054   commands run inside the config file can use it to make decisions (typically
 1055   about default-terminal).
 1056 
 1057 * Make the initial client wait until config file parsing has finished to avoid
 1058   racing with commands.
 1059 
 1060 * Fix core when if-shell fails.
 1061 
 1062 * Only use ED to clear screen if the pane is at the bottom.
 1063 
 1064 * Fix multibyte UTF-8 output.
 1065 
 1066 * Code improvements around target (-t) resolution.
 1067 
 1068 * Change how the default target (for commands without -t) is managed across
 1069   command sequences: now it is set up at the start and commands are required
 1070   to update it if needed. Fixes binding command sequences to mouse keys.
 1071 
 1072 * Make if-shell from the config file work correctly.
 1073 
 1074 * Change to always check the root key table if no binding is found in the
 1075   current table (prefix table or copy-mode table or whatever). This means that
 1076   root key bindings will take effect even in copy mode, if not overridden by a
 1077   copy mode key binding.
 1078 
 1079 * Fix so that the history file works again.
 1080 
 1081 * Run config file without a client rather than using the first client, restores
 1082   previous behaviour.
 1083 
 1084 * If a #() command doesn't exit, continue to read from it and use its last full
 1085   line of output.
 1086 
 1087 * Handle slow terminals and fast output better: when the amount of data
 1088   outstanding gets too large, discard output until it is drained and we are
 1089   able to do a full redraw. Prevents tmux sitting on a huge buffer that the
 1090   terminal will take forever to consume.
 1091 
 1092 * Do not redraw a client unless we realistically think it can accept the data -
 1093   defer redraws until the client has nothing else waiting to write.
 1094 
 1095 CHANGES FROM 2.3 TO 2.4, 20 April 2017
 1096 
 1097 Incompatible Changes
 1098 ====================
 1099 
 1100 * Key tables have undergone major changes. Mode key tables are no longer
 1101   separate from the main key tables. All mode key tables have been removed,
 1102   together with the -t flag to bind-key and unbind-key.
 1103 
 1104   The emacs-edit, vi-edit, emacs-choose and vi-choose tables have been replaced
 1105   by fixed key bindings in the command prompt and choose modes. The mode-keys
 1106   and status-keys options remain.
 1107 
 1108   The emacs-copy and vi-copy tables have been replaced by the copy-mode and
 1109   copy-mode-vi tables. Commands are sent using the -X and -N flags to
 1110   send-keys. So the following:
 1111 
 1112     bind -temacs-copy C-Up scroll-up
 1113     bind -temacs-copy -R5 WheelUpPane scroll-up
 1114 
 1115   Becomes:
 1116 
 1117     bind -Tcopy-mode C-Up send -X scroll-up
 1118     bind -Tcopy-mode WheelUpPane send -N5 -X scroll-up
 1119 
 1120   These changes allows the full command parser (including command sequences) and
 1121   command set to be used - for example, the normal command prompt with editing
 1122   and history is now used for searching, jumping, and so on instead of a custom
 1123   one. The default C-r binding is now:
 1124 
 1125     bind -Tcopy-mode C-r command-prompt -i -p'search up' "send -X search-backward-incremental '%%'"
 1126 
 1127   There are also some new commmands available with send -X, such as
 1128   copy-pipe-and-cancel.
 1129 * set-remain-on-exit has gone -- can be achieved with hooks instead.
 1130 * Hooks: before hooks have been removed and only a selection of commands now
 1131   have after hooks (they are no longer automatic). Additional hooks have been
 1132   added.
 1133 * The xterm-keys option now defaults to on.
 1134 
 1135 Normal Changes
 1136 ==============
 1137 
 1138 * Support for mouse double and triple clicks.
 1139 * BCE (Background Colour Erase) is now supported.
 1140 * All occurrences of a search string in copy mode are now highlighted;
 1141   additionally, the number of search results is displayed. The highlighting
 1142   updates interactively with the default emacs key bindings (incremental
 1143   search).
 1144 * source-file now understands glob patterns.
 1145 * Formats now have simple comparisons:
 1146 
 1147     #{==:a,b}
 1148     #{!=:a,b}
 1149 
 1150 * There are the following new formats:
 1151 
 1152   - #{version} -- the tmux server version;
 1153   - #{client_termtype} -- the terminal type of the client;
 1154   - #{client_name} -- the name of a client;
 1155   - #{client_written} -- the number of bytes written to the client.
 1156 
 1157 * The configuration file now accepts %if/%endif conditional blocks which are
 1158   processed when it is parsed; the argument is a format string (useful with the
 1159   new format comparison options).
 1160 * detach-client now has -E to execute a command replacing the client instead of
 1161   exiting.
 1162 * Add support for custom command aliases, this is an array option which
 1163   contains items of the form "alias=command". This is consulted when an
 1164   unknown command is parsed.
 1165 * break-pane now has -n to specify the new window name.
 1166 * OSC 52 support has been added for programs inside tmux to set a tmux buffer.
 1167 * The mouse "all event" mode (1003) is now supported.
 1168 * Palette setting is now possible (OSC 4 and 104).
 1169 * Strikethrough support (a recent terminfo is required).
 1170 * Grouped sessions can now be named (new -t).
 1171 * terminal-overrides and update-environment are now array options (the previous
 1172   set -ag syntax should work without change).
 1173 * There have been substantial performance improvements.
 1174 
 1175 CHANGES FROM 2.2 TO 2.3, 29 September 2016
 1176 
 1177 Incompatible Changes
 1178 ====================
 1179 
 1180 None.
 1181 
 1182 Normal Changes
 1183 ==============
 1184 
 1185 * New option 'pane-border-status' to add text in the pane borders.
 1186 * Support for hooks on commands: 'after' and 'before' hooks.
 1187 * 'source-file' understands '-q' to suppress errors for nonexistent files.
 1188 * Lots of UTF8 improvements, especially on MacOS.
 1189 * 'window-status-separator' understands #[] expansions.
 1190 * 'split-window' understands '-f' for performing a full-width split.
 1191 * Allow report count to be specified when using 'bind-key -R'.
 1192 * 'set -a' for appending to user options (@foo) is now supported.
 1193 * 'display-panes' can now accept a command to run, rather than always
 1194   selecting the pane.
 1195 
 1196 CHANGES FROM 2.1 TO 2.2, 10 April 2016
 1197 
 1198 Incompatible Changes
 1199 ====================
 1200 
 1201 * The format strings which referenced time have been removed.  Instead:
 1202 
 1203   #{t:window_activity}
 1204 
 1205 can be used.
 1206 
 1207 * Support for TMPDIR has been removed.  Use TMUX_TMPDIR instead.
 1208 * UTF8 detection now happens automatically if the client supports it, hence
 1209   the:
 1210 
 1211   mouse-utf8
 1212   utf8
 1213 
 1214   options has been removed.
 1215 * The:
 1216 
 1217   mouse_utf8_flag
 1218 
 1219   format string has been removed.
 1220 * The -I option to show-messages has been removed.  See:
 1221 
 1222   #{t:start_time}
 1223 
 1224   format option instead.
 1225 
 1226 Normal Changes
 1227 ==============
 1228 
 1229 * Panes are unzoomed with selectp -LRUD
 1230 * New formats added:
 1231 
 1232   #{scroll_position}
 1233   #{socket_path}
 1234   #{=10:...} -- limit to N characters (from the start)
 1235   #{=-10:...} -- limit to N characters (from the end)
 1236   #{t:...} -- used to format time-based formats
 1237   #{b:...} -- used to ascertain basename from string
 1238   #{d:...} -- used to ascertain dirname from string
 1239   #{s:...} -- used to perform substitutions on a string
 1240 
 1241 * Job output is run via the format system, so formats work again
 1242 * If display-time is set to 0, then the indicators wait for a key to be
 1243   pressed.
 1244 * list-keys and list-commands can be run without starting the tmux server.
 1245 * kill-session learns -C to clear all alerts in all windows of the session.
 1246 * Support for hooks (internal for now), but hooks for the following have been
 1247   implemented:
 1248 
 1249   alert-bell
 1250   alert-silence
 1251   alert-activity
 1252   client-attached
 1253   client-detached
 1254   client-resized
 1255   pane-died
 1256   pane-exited
 1257 
 1258 * RGB (24bit) colour support.  The 'Tc' flag must be set in the external TERM
 1259   entry (using terminal-overrides or a custom terminfo entry).
 1260 
 1261 CHANGES FROM 2.0 TO 2.1, 18 October 2015
 1262 
 1263 Incompatible Changes
 1264 ====================
 1265 
 1266 * Mouse-mode has been rewritten.  There's now no longer options for:
 1267 	- mouse-resize-pane
 1268 	- mouse-select-pane
 1269 	- mouse-select-window
 1270 	- mode-mouse
 1271 
 1272   Instead there is just one option:  'mouse' which turns on mouse support
 1273   entirely.
 1274 * 'default-terminal' is now a session option.  Furthermore, if this is set
 1275   to 'screen-*' then emulate what screen does.  If italics are wanted, this
 1276   can be set to 'tmux' but this is still new and not necessarily supported
 1277   on all platforms with older ncurses installs.
 1278 * The c0-* options for rate-limiting have been removed.  Instead, a backoff
 1279   approach is used.
 1280 
 1281 Normal Changes
 1282 ==============
 1283 
 1284 * New formats:
 1285 	- session_activity
 1286 	- window_linked
 1287 	- window_activity_format
 1288 	- session_alerts
 1289 	- session_last_attached
 1290 	- client_pid
 1291 	- pid
 1292 * 'copy-selection', 'append-selection', 'start-named-buffer' now understand
 1293   an '-x' flag to prevent it exiting copying mode.
 1294 * 'select-pane' now understands '-P' to set window/pane background colours.
 1295 * 'renumber-windows' now understands windows which are unlinked.
 1296 * 'bind' now understands multiple key tables.  Allows for key-chaining.
 1297 * 'select-layout' understands '-o' to undo the last layout change.
 1298 * The environment is updated when switching sessions as well as attaching.
 1299 * 'select-pane' now understands '-M' for marking a pane.  This marked pane
 1300   can then be used with commands which understand src-pane specifiers
 1301   automatically.
 1302 * If a session/window target is prefixed with '=' then only an exact match
 1303   is considered.
 1304 * 'move-window' understands '-a'.
 1305 * 'update-environment' understands '-E' when attach-session is used on an
 1306   already attached client.
 1307 * 'show-environment' understands '-s' to output Bourne-compatible commands.
 1308 * New option: 'history-file' to save/restore command prompt history.
 1309 * Copy mode is exited if the history is cleared whilst in copy-mode.
 1310 * 'copy-mode' learned '-e' to exit copy-mode when scrolling to end.
 1311 
 1312 CHANGES FROM 1.9a TO 2.0, 06 March 2015
 1313 
 1314 Incompatible Changes
 1315 ====================
 1316 
 1317 * The choose-list command has been removed.
 1318 * 'terminal-overrides' is now a server option, not a session option.
 1319 * 'message-limit' is now a server option, not a session option.
 1320 * 'monitor-content' option has been removed.
 1321 * 'pane_start_path' option has been removed.
 1322 * The "info" mechanism which used to (for some commands) provide feedback
 1323   has been removed, and like other commands, they now produce nothing on
 1324   success.
 1325 
 1326 Normal Changes
 1327 ==============
 1328 
 1329 * tmux can now write an entry to utmp if the library 'utempter' is present
 1330   at compile time.
 1331 * set-buffer learned append mode (-a), and a corresponding
 1332   'append-selection' command has been added to copy-mode.
 1333 * choose-mode now has the following commands which can be bound:
 1334 	- start-of-list
 1335 	- end-of-list
 1336 	- top-line
 1337 	- bottom-line
 1338 
 1339 * choose-buffer now understands UTF-8.
 1340 * Pane navigation has changed:
 1341 	- The old way of always using the top or left if the choice is ambiguous.
 1342 	- The new way of remembering the last used pane is annoying if the
 1343 	  layout is balanced and the leftmost is obvious to the user (because
 1344 	  clearly if we go right from the top-left in a tiled set of four we want
 1345 	  to end up in top-right, even if we were last using the bottom-right).
 1346 
 1347       So instead, use a combination of both: if there is only one possible
 1348       pane alongside the current pane, move to it, otherwise choose the most
 1349       recently used of the choice.
 1350 * 'set-buffer' can now be told to give names to buffers.
 1351 * The 'new-session', 'new-window', 'split-window', and 'respawn-pane' commands
 1352   now understand multiple arguments and handle quoting problems correctly.
 1353 * 'capture-pane' understands '-S-' to mean the start of the pane, and '-E-' to
 1354   mean the end of the pane.
 1355 * Support for function keys beyond F12 has changed.  The following explains:
 1356 	- F13-F24 are S-F1 to S-F12
 1357 	- F25-F36 are C-F1 to C-F12
 1358 	- F37-F48 are C-S-F1 to C-S-F12
 1359 	- F49-F60 are M-F1 to M-F12
 1360 	- F61-F63 are M-S-F1 to M-S-F3
 1361 
 1362  Therefore, F13 becomes a binding of S-F1, etc.
 1363 * Support using pane id as part of session or window specifier (so % means
 1364   session-of-%1 or window-of-%1) and window id as part of session
 1365   (so @1 means session-of-@1).
 1366 * 'copy-pipe' command now understands formats via -F
 1367 * 'if-shell'  command now understands formats via -F
 1368 * 'split-window' and 'join-window' understand -b to create the pane to the left
 1369   or above the target pane.
 1370 
 1371 CHANGES FROM 1.9 TO 1.9a, 22 February 2014
 1372 
 1373 NOTE: This is a bug-fix release to address some important bugs which just
 1374 missed the 1.9 deadline, but were found afterwards.
 1375 
 1376 Normal Changes
 1377 ==============
 1378 
 1379 * Fix crash due to uninitialized lastwp member of layout_cell
 1380 * Fix -fg/-bg/-style with 256 colour terminals.
 1381 
 1382 CHANGES FROM 1.8 TO 1.9, 20 February 2014
 1383 
 1384 NOTE:  This release has bumped the tmux protocol version.  It is therefore
 1385 advised that the prior tmux server is restarted when this version of tmux is
 1386 installed, to avoid protocol mismatch errors for newer clients trying to
 1387 talk to an older running tmux server.
 1388 
 1389 Incompatible Changes
 1390 ====================
 1391 
 1392 * 88 colour support has been removed.
 1393 * 'default-path' has been removed.  The new-window command accepts '-c' to
 1394   cater for this.  The previous value of "." can be replaced with: 'neww -c
 1395   $PWD', the previous value of '' which meant current path of the pane can
 1396   be specified as:  'neww -c "#{pane_current_path}"'
 1397 
 1398 Deprecated Changes
 1399 ==================
 1400 
 1401 * The single format specifiers:  #A -> #Z (where defined) have been
 1402   deprecated and replaced with longer-named equivalents, as listed in the
 1403   FORMATS section of the tmux manpage.
 1404 * The various foo-{fg,bg,attr} commands have been deprecated and replaced
 1405   with equivalent foo-style option instead.  Currently this is still
 1406   backwards-compatible, but will be removed over time.
 1407 
 1408 Normal Changes
 1409 ==============
 1410 
 1411 * A new environment variable TMUX_TMPDIR is now honoured, allowing the
 1412   socket directory to be set outside of TMPDIR (/tmp/ if not set).
 1413 * If -s not given to swap-pane the current pane is assumed.
 1414 * A #{pane_synchronized} format specifier has been added to be a conditional
 1415   format if a pane is in a synchronised mode (c.f. synchronize-panes)
 1416 * Tmux now runs under Cygwin natively.
 1417 * Formats can now be nested within each other and expanded accordingly.
 1418 * Added 'automatic-rename-format' option to allow the automatic rename
 1419   mechanism to use something other than the default of
 1420   #{pane_current_command}.
 1421 * new-session learnt '-c' to specify the starting directory for that session
 1422   and all subsequent windows therein.
 1423 * The session name is now shown in the message printed to the terminal when
 1424   a session is detached.
 1425 * Lots more format specifiers have been added.
 1426 * Server race conditions have been fixed; in particular commands are not run
 1427   until after the configuration file is read completely.
 1428 * Case insensitive searching in tmux's copy-mode is now possible.
 1429 * attach-session and switch-client learnt the '-t' option to accept a window
 1430   and/or a pane to use.
 1431 * Copy-mode is only exited if no selection is in progress.
 1432 * Paste key in copy-mode is now possible to enter text from the clipboard.
 1433 * status-interval set to '0' now works as intended.
 1434 * tmux now supports 256 colours running under fbterm.
 1435 * Many bug fixes!
 1436 
 1437 CHANGES FROM 1.7 TO 1.8, 26 March 2013
 1438 
 1439 Incompatible Changes
 1440 ====================
 1441 
 1442 * layout redo/undo has been removed.
 1443 
 1444 Normal Changes
 1445 ==============
 1446 
 1447 * Add halfpage up/down bindings to copy mode.
 1448 * Session choosing fixed to work with unattached sessions.
 1449 * New window options window-status-last-{attr,bg,fg} to denote the last
 1450   window which was active.
 1451 * Scrolling in copy-mode now scrolls the region without moving the mouse
 1452   cursor.
 1453 * run-shell learnt '-t' to specify the pane to use when displaying output.
 1454 * Support for middle-click pasting.
 1455 * choose-tree learns '-u' to start uncollapsed.
 1456 * select-window learnt '-T' to toggle to the last window if it's already
 1457   current.
 1458 * New session option 'assume-paste-time' for pasting text versus key-binding
 1459   actions.
 1460 * choose-* commands now work outside of an attached client.
 1461 * Aliases are now shown for list-commands command.
 1462 * Status learns about formats.
 1463 * Free-form options can be set with set-option if prepended with an '@'
 1464   sign.
 1465 * capture-pane learnt '-p' to send to stdout, and '-e' for capturing escape
 1466   sequences, and '-a' to capture the alternate screen, and '-P' to dump
 1467   pending output.
 1468 * Many new formats added (client_session, client_last_session, etc.)
 1469 * Control mode, which is a way for a client to send tmux commands.
 1470   Currently more useful to users of iterm2.
 1471 * resize-pane learnt '-x' and '-y' for absolute pane sizing.
 1472 * Config file loading now reports errors from all files which are loaded via
 1473   the 'source-file' command.
 1474 * 'copy-pipe' mode command to copy selection and pipe the selection to a
 1475   command.
 1476 * Panes can now emit focus notifications for certain applications
 1477   which use those.
 1478 * run-shell and if-shell now accept formats.
 1479 * resize-pane learnt '-Z' for zooming a pane temporarily.
 1480 * new-session learnt '-A' to make it behave like attach-session.
 1481 * set-option learnt '-o' to prevent setting an option which is already set.
 1482 * capture-pane and show-options learns '-q' to silence errors.
 1483 * New command 'wait-for' which blocks a client until woken up again.
 1484 * Resizing panes will now reflow the text inside them.
 1485 * Lots and lots of bug fixes, fixing memory-leaks, etc.
 1486 * Various manpage improvements.
 1487 
 1488 CHANGES FROM 1.6 TO 1.7, 13 October 2012
 1489 
 1490 * tmux configuration files now support line-continuation with a "\" at the
 1491   end of a line.
 1492 * New option status-position to move the status line to the top or bottom of
 1493   the screen.
 1494 * Enforce history-limit option when clearing the screen.
 1495 * Give each window a unique id, like panes but prefixed with @.
 1496 * Add pane id to each pane in layout description (while still accepting
 1497   the old form).
 1498 * Provide defined ways to set the various default-path possibilities: ~
 1499   for home directory, . for server start directory, - for session start
 1500   directory and empty for the pane's working directory (the default). All
 1501   can also be used as part of a relative path (eg -/foo). Also provide -c
 1502   flags to neww and splitw to override default-path setting.
 1503 * Add -l flag to send-keys to send input literally (without translating
 1504   key names).
 1505 * Allow a single option to be specified to show-options to show just that
 1506   option.
 1507 * New command "move-pane" (like join-pane but allows the same window).
 1508 * join-pane and move-pane commands learn "-b" option to place the pane to
 1509   the left or above.
 1510 * Support for bracketed-paste mode.
 1511 * Allow send-keys command to accept hex values.
 1512 * Add locking around "start-server" to avoid race-conditions.
 1513 * break-pane learns -P/-F arguments for display formatting.
 1514 * set-option learns "-q" to make it quiet, and not print out anything.
 1515 * copy mode learns "wrap-search" option.
 1516 * Add a simple form of output rate limiting by counting the number of
 1517   certain C0 sequences (linefeeds, backspaces, carriage returns) and if it
 1518   exceeds a threshold (current default 250/millisecond), start to redraw
 1519   the pane every 100 milliseconds instead of making each change as it
 1520   comes. Two configuration options - c0-change-trigger and
 1521   c0-change-interval.
 1522 * find-window learns new flags:  "-C", "-N", "-T" to match against either or
 1523   all of a window's content, name, or title.  Defaults to all three options
 1524   if none specified.
 1525 * find-window automatically selects the appropriate pane for the found
 1526   matches.
 1527 * show-environment can now accept one option to show that environment value.
 1528 * Exit mouse mode when end-of-screen reached when scrolling with the mouse
 1529   wheel.
 1530 * select-layout learns -u and -U for layout history stacks.
 1531 * kill-window, detach-client, kill-session all  learn "-a" option for
 1532   killing all but the current thing specified.
 1533 * move-window learns "-r" option to renumber window sequentially in a
 1534   session.
 1535 * New session option "renumber-windows" to automatically renumber windows in
 1536   a session when a window is closed.  (see "move-window -r").
 1537 * Only enter copy-mode on scroll up.
 1538 * choose-* and list-* commands all use "-F" for format specifiers.
 1539 * When spawning external commands, the value from the "default-shell" option
 1540   is now used, rather than assuming /bin/sh.
 1541 * New choose-tree command to render window/sessions as a tree for selection.
 1542 * display-message learns new format options.
 1543 * For linked-windows across sessions, all flags for that window are now
 1544   cleared across sessions.
 1545 * Lots and lots of bug fixes, fixing memory-leaks, etc.
 1546 * Various manpage improvements.
 1547 
 1548 CHANGES FROM 1.5 TO 1.6, 23 January 2012
 1549 
 1550 * Extend the mode-mouse option to add a third choice which means the mouse
 1551   does not enter copy mode.
 1552 * Add a -r flag to switch-client to toggle the client read-only flag.
 1553 * Add pane-base-index option.
 1554 * Support \ for line continuation in the configuration file.
 1555 * Framework for more powerful formatting of command output and use it for
 1556   list-{panes,windows,sessions}. This allows more descriptive replacements
 1557   (such as #{session_name}) and conditionals.
 1558 * Mark dead panes with some text saying they are dead.
 1559 * Reject $SHELL if it is not a full path.
 1560 * Add -S option to refresh-client to redraw status line.
 1561 * Add an else clause for if-shell.
 1562 * Try to resolve relative paths for loadb and saveb (first, using client
 1563   working directory, if any, then default-path or session working directory).
 1564 * Support for \e[3J to clear the history and send the corresponding
 1565   terminfo code (E3) before locking.
 1566 * When in copy mode, make repeat count indicate buffer to replace, if used.
 1567 * Add screen*:XT to terminal-overrides for tmux-in-tmux.
 1568 * Status-line message attributes added.
 1569 * Move word-separators to be a session rather than window option.
 1570 * Change the way the working directory for new processes is discovered. If
 1571   default-path isn't empty, it is used. Otherwise, if a new window is created
 1572   from the command-line, the working directory of the client is used. If not,
 1573   platform specific code is used to retrieve the current working directory
 1574   of the process in the active pane. If that fails, the directory where the
 1575   session was created is used, instead.
 1576 * Do not change the current pane if both mouse-select-{pane,window} are
 1577   enabled.
 1578 * Add \033[s and \033[u to save and restore cursor position.
 1579 * Allow $HOME to be used as default-path.
 1580 * Add CNL and CPL escape sequences.
 1581 * Calculate last position correctly for UTF-8 wide characters.
 1582 * Add an option allow-rename to disable the window rename escape sequence.
 1583 * Attributes for each type of status-line alert (ie bell, content and
 1584   activity) added. Therefore, remove the superfluous options
 1585   window-status-alert-{attr,bg,fg}.
 1586 * Add a -R flag to send-keys to reset the terminal.
 1587 * Add strings to allow the aixterm bright colours to be used when
 1588   configuring colours.
 1589 * Drop the ability to have a list of keys in the prefix in favour of two
 1590   separate options, prefix and prefix2.
 1591 * Flag -2 added to send-prefix to send the secondary prefix key.
 1592 * Show pane size in top right of display panes mode.
 1593 * Some memory leaks plugged.
 1594 * More command-prompt editing improvements.
 1595 * Various manpage improvements.
 1596 * More Vi mode improvements.
 1597 
 1598 CHANGES FROM 1.4 TO 1.5, 09 July 2011
 1599 
 1600 * Support xterm mouse modes 1002 and 1003.
 1601 * Change from a per-session stack of buffers to one global stack. This renders
 1602   copy-buffer useless and makes buffer-limit now a server option.
 1603 * Fix most-recently-used choice by avoiding reset the activity timer for
 1604   unattached sessions every second.
 1605 * Add a -P option to new-window and split-window to print the new window or
 1606   pane index in target form (useful to pass it into other commands).
 1607 * Handle a # at the end of a replacement string (such as status-left)
 1608   correctly.
 1609 * Support for UTF-8 mouse input (\033[1005h) which was added in xterm 262.
 1610   If the new mouse-utf8 option is on, UTF-8 mouse input is enabled for all
 1611   UTF-8 terminals. The option defaults to on if LANG etc are set in the same
 1612   manner as the utf8 option.
 1613 * Support for HP-UX.
 1614 * Accept colours of the hex form #ffffff and translate to the nearest from the
 1615   xterm(1) 256-colour set.
 1616 * Clear the non-blocking IO flag (O_NONBLOCK) on the stdio file descriptors
 1617   before closing them (fixes things like "tmux ls && cat").
 1618 * Use TMPDIR if set.
 1619 * Fix next and previous session functions to actually work.
 1620 * Support -x and -y for new-session to specify the initial size of the window
 1621   if created detached with -d.
 1622 * Make bind-key accept characters with the top-bit-set and print them as octal.
 1623 * Set $TMUX without the session when background jobs are run.
 1624 * Simplify the way jobs work and drop the persist type, so all jobs are
 1625   fire-and-forget.
 1626 * Accept tcgetattr/tcsetattr(3) failure, fixes problems with fatal() if the
 1627   terminal disappears while locked.
 1628 * Add a -P option to detach to HUP the client's parent process (usually causing
 1629   it to exit as well).
 1630 * Support passing through escape sequences to the underlying terminal by using
 1631   DCS with a "tmux;" prefix.
 1632 * Prevent tiled producing a corrupt layout when only one column is needed.
 1633 * Give each pane created in a tmux server a unique id (starting from 0), put it
 1634   in the TMUX_PANE environment variable and accept it as a target.
 1635 * Allow a start and end line to be specified for capture-pane which may be
 1636   negative to capture part of the history.
 1637 * Add -a and -s options to lsp to list all panes in the server or session
 1638   respectively. Likewise add -s to lsw.
 1639 * Change -t on display-message to be target-pane for the #[A-Z] replacements
 1640   and add -c as target-client.
 1641 * The attach-session command now prefers the most recently used unattached
 1642   session.
 1643 * Add -s option to detach-client to detach all clients attached to a session.
 1644 * Add -t to list-clients.
 1645 * Change window with mouse wheel over status line if mouse-select-window is on.
 1646 * When mode-mouse is on, automatically enter copy mode when the mouse is
 1647   dragged or the mouse wheel is used. Also exit copy mode when the mouse wheel
 1648   is scrolled off the bottom.
 1649 * Provide #h character pair for short hostname (no domain).
 1650 * Don't use strnvis(3) for the title as it breaks UTF-8.
 1651 * Use the tsl and fsl terminfo(5) capabilities to update terminal title and
 1652   automatically fill them in on terminals with the XT capability (which means
 1653   their title setting is xterm-compatible).
 1654 * Add a new option, mouse-resize-pane. When on, panes may be resized by
 1655   dragging their borders.
 1656 * Fix crash by resetting last pane on {break,swap}-pane across windows.
 1657 * Add three new copy-mode commands - select-line, copy-line, copy-end-of-line.
 1658 * Support setting the xterm clipboard when copying from copy mode using the
 1659   xterm escape sequence for the purpose (if xterm is configured to allow it).
 1660 * Support xterm(1) cursor colour change sequences through terminfo(5) Cc
 1661   (set) and Cr (reset) extensions.
 1662 * Support DECSCUSR sequence to set the cursor style with two new terminfo(5)
 1663   extensions, Cs and Csr.
 1664 * Make the command-prompt custom prompts recognize the status-left option
 1665   character pairs.
 1666 * Add a respawn-pane command.
 1667 * Add a couple of extra xterm-style keys that gnome terminal provides.
 1668 * Allow the initial context on prompts to be set with the new -I option to
 1669   command-prompt. Include the current window and session name in the prompt
 1670   when renaming and add a new key binding ($) for rename session.
 1671 * Option bell-on-alert added to trigger the terminal bell when there is an
 1672   alert.
 1673 * Change the list-keys format so that it shows the keys using actual tmux
 1674   commands which should be able to be directly copied into the config file.
 1675 * Show full targets for lsp/lsw -a.
 1676 * Make confirm-before prompt customizable with -p option like command-prompt
 1677   and add the character pairs #W and #P to the default kill-{pane,window}
 1678   prompts.
 1679 * Avoid sending data to suspended/locked clients.
 1680 * Small memory leaks in error paths plugged.
 1681 * Vi mode improvements.
 1682 
 1683 CHANGES FROM 1.3 TO 1.4, 27 December 2010
 1684 
 1685 * Window bell reporting fixed.
 1686 * Show which pane is active in the list-panes output.
 1687 * Backoff reworked.
 1688 * Prevent the server from dying when switching into copy mode when already
 1689   in a different mode.
 1690 * Reset running jobs when the status line is enabled or disabled.
 1691 * Simplify xterm modifier detection.
 1692 * Avoid crashing in copy mode if the screen size is too small for the
 1693   indicator.
 1694 * Flags -n and -p added to switch-client.
 1695 * Use UTF-8 line drawing characters on UTF-8 terminals, thus fixing some
 1696   terminals (eg putty) which disable the vt100 ACS mode switching sequences
 1697   in UTF-8 mode. On terminals without ACS, use ASCII equivalents.
 1698 * New server option exit-unattached added.
 1699 * New session option destroy-unattached added.
 1700 * Fall back on normal session choice method if $TMUX exists but is invalid
 1701   rather than rejecting.
 1702 * Mark repeating keys with "(repeat)" in the key list.
 1703 * When removing a pane, don't change the active pane unless the active pane
 1704   is actually the one being removed.
 1705 * New command last-pane added.
 1706 * AIX fixes.
 1707 * Flag -a added to unbind-key.
 1708 * Add XAUTHORITY to update-environment.
 1709 * More info regarding window and pane flags is now shown in list-*.
 1710 * If VISUAL or EDITOR contains "vi" configure mode-keys and status-key to vi.
 1711 * New window option monitor-silence and session option visual-silence added.
 1712 * In the built-in layouts distribute the panes more evenly.
 1713 * Set the default value of main-pane-width to 80 instead of 81.
 1714 * Command-line flag -V added.
 1715 * Instead of keeping a per-client prompt history make it global.
 1716 * Fix rectangle copy to behave like emacs (the cursor is not part of the
 1717   selection on the right edge but on the left it is).
 1718 * Flag -l added to switch-client.
 1719 * Retrieve environment variables from the global environment rather than
 1720   getenv(3), thus allowing them to be updated during the configuration file.
 1721 * New window options other-pane-{height,width} added.
 1722 * More minor bugs fixed and manpage improvements.
 1723 
 1724 CHANGES FROM 1.2 TO 1.3, 18 July 2010
 1725 
 1726 * New input parser.
 1727 * Flags to move through panes -UDLR added to select-pane.
 1728 * Commands up-pane, and down-pane removed, since equivalent behaviour is now
 1729   available through the target flag (-t:+ and -t:-).
 1730 * Jump-forward/backward in copy move (based on vi's F, and f commands).
 1731 * Make paste-buffer accept a pane as a target.
 1732 * Flag -a added to new-window to insert a window after an existing one, moving
 1733   windows up if necessary.
 1734 * Merge more mode into copy mode.
 1735 * Run job commands explicitly in the global environment (which can be modified
 1736   with setenv -g), rather than with the environment tmux started with.
 1737 * Use the machine's hostname as the default title, instead of an empty string.
 1738 * Prevent double free if the window option remain-on-exit is set.
 1739 * Key string conversions rewritten.
 1740 * Mark zombie windows as dead in the choose-window list.
 1741 * Tiled layout added.
 1742 * Signal handling reworked.
 1743 * Reset SIGCHLD after fork to fix problems with some shells.
 1744 * Select-prompt command removed. Therefore, bound ' to command-prompt -p index
 1745   "select-window -t:%%" by default.
 1746 * Catch SIGHUP and terminate if running as a client, thus avoiding clients from
 1747   being left hanging around when, for instance, a SSH session is disconnected.
 1748 * Solaris 9 fixes (such as adding compat {get,set}env(3) code).
 1749 * Accept none instead of default for attributes.
 1750 * Window options window-status-alert-{alert,bg,fg} added.
 1751 * Flag -s added to the paste-buffer command to specify a custom separator.
 1752 * Allow dragging to make a selection in copy mode if the mode-mouse option is
 1753   set.
 1754 * Support the mouse scroll wheel.
 1755 * Make pipe-pane accept special character sequences (eg #I).
 1756 * Fix problems with window sizing when starting tmux from .xinitrc.
 1757 * Give tmux sockets (but not the containing folder) group permissions.
 1758 * Extend the target flags (ie -t) to accept an offset (for example -t:+2), and
 1759   make it wrap windows, and panes.
 1760 * New command choose-buffer added.
 1761 * New server option detach-on-destroy to set what happens to a client when the
 1762   session it is attached to is destroyed. If on (default), the client is
 1763   detached. Otherwise, the client is switched to the most recently active of
 1764   the remaining sessions.
 1765 * The commands load-buffer, and save-buffer now accept a dash (-) as the file
 1766   to read from stdin, or write to stdout.
 1767 * Custom layouts added.
 1768 * Additional code reduction, bug fixes, and manpage enhancements.
 1769 
 1770 CHANGES FROM 1.1 TO 1.2, 10 March 2010
 1771 
 1772 * Switch to libevent.
 1773 * Emulate the ri (reverse index) capability, ergo allowing tmux to at least
 1774   start on Sun consoles (TERM=sun, or sun-color).
 1775 * Assign each entry a number, or lowercase letter in choose mode, and accept
 1776   that as a shortcut key.
 1777 * Permit top-bit-set characters to be entered in the status line.
 1778 * Mark no-prefix keys with (no prefix), rather than [] in list-keys.
 1779 * New command show-messages (alias showmsgs), and new session option
 1780   message-limit, to show a per-client log of status lines messages up to the
 1781   number defined by message-limit.
 1782 * Do not interpret #() for display-message to avoid leaking commands.
 1783 * New window options window-status-format, and window-status-current-format to
 1784   control the format of each window in the status line.
 1785 * Add a -p flag to display-message to print the output, instead of displaying
 1786   it in the status line.
 1787 * Emulate il1, dl1, ich1 to run with vt100 feature set.
 1788 * New command capture-pane (alias capturep) to copy the entire pane contents
 1789   to a paste buffer.
 1790 * Avoid duplicating code by adding a -w flag to set-option, and show-options to
 1791   set, and show window options. The commands set-window-option, and
 1792   show-window-options are now aliases.
 1793 * Panes can now be referred to as top, bottom, top-left, etc.
 1794 * Add server-wide options, which can be set with set-option -s, and shown with
 1795   show-options -s.
 1796 * New server option quiet (like -q from the command line).
 1797 * New server option escape-time to set the timeout used to detect if escapes
 1798   are alone, part of a function key, or meta sequence.
 1799 * New session options pane-active-border-bg, pane-active-border-fg,
 1800   pane-border-bg, and pane-border-fg to set pane colours.
 1801 * Make split-window accept a pane target, instead of a window.
 1802 * New command join-pane (alias joinp) to split, and move an existing pane into
 1803   the space (the opposite of break-pane), thus simplifying calls to
 1804   split-window, followed by move-window.
 1805 * Permit S- prefix on keys for shift when the terminal/terminfo supports them.
 1806 * Window targets (-t flag) can now refer to the last window (!), next (+), and
 1807   previous (-) window by number.
 1808 * Mode keys to jump to the bottom/top of history, end of the next word, scroll
 1809   up/down, and reverse search in copy mode.
 1810 * New session option display-panes-active-colour to display the active pane in
 1811   a different colour with the display-panes command.
 1812 * Read the socket path from $TMUX if it's present, and -L, and -S are not
 1813   given.
 1814 * Vi-style mode keys B, W, and E to navigate between words in copy mode.
 1815 * Start in more mode when configuration file errors are detected.
 1816 * Rectangle copy support added.
 1817 * If attach-session was specified with the -r flag, make the client read-only.
 1818 * Per-window alternate-screen option.
 1819 * Make load-buffer work with FIFOs.
 1820 * New window option word-separators to set the characters considered as word
 1821   separators in copy mode.
 1822 * Permit keys in copy mode to be prefixed by a repeat count, entered with [1-9]
 1823   in vi mode, or M-[1-9] in emacs mode.
 1824 * utf8 improvements.
 1825 * As usual, additional code reduction, bug fixes, and manpage enhancements.
 1826 
 1827 CHANGES FROM 1.0 TO 1.1, 05 November 2009
 1828 
 1829 * New run-shell (alias run) command to run an external command without a
 1830   window, capture it's stdout, and send it to output mode.
 1831 * Ability to define multiple prefix keys.
 1832 * Internal locking mechanism removed. Instead, detach each client and run the
 1833   external command specified in the new session option lock-command (by default
 1834   lock -np), thus allowing the system password to be used.
 1835 * set-password command, and -U command line flag removed per the above change.
 1836 * Add support for -c command line flag to execute a shell command.
 1837 * New lock-client (alias lockc), and lock-session (alias locks) commands to
 1838   lock a particular client, or all clients attached to a session.
 1839 * Support C-n/C-p/C-v/M-v with emacs keys in choice mode.
 1840 * Use : for goto line rather than g in vi mode.
 1841 * Try to guess which client to use when no target client was specified. Finds
 1842   the current session, and if only one client is present, use it. Otherwise,
 1843   return the most recently used client.
 1844 * Make C-Down/C-Up in copy mode scroll the screen down/up one line without
 1845   moving the cursor.
 1846 * Scroll mode superseded by copy mode.
 1847 * New synchronize-panes window option to send all input to all other panes in
 1848   the same window.
 1849 * New lock-server session option to lock, when off (on by default), each
 1850   session when it has been idle for the lock-after-time setting. When on, the
 1851   entire server locks when all sessions have been idle for their individual
 1852   lock-after-time setting.
 1853 * Add support for grouped sessions which have independent name, options,
 1854   current window, but where the linked windows are synchronized (ie creating,
 1855   killing windows are mirrored between the sessions). A grouped session may be
 1856   created by passing -t to new-session.
 1857 * New mouse-select-pane session option to select the current pane with the
 1858   mouse.
 1859 * Queue, and run commands in the background for if-shell, status-left,
 1860   status-right, and #() by starting each once every status-interval. Adds the
 1861   capability to call some programs which would previously cause the server to
 1862   hang (eg sleep/tmux). It also avoids running commands excessively (ie if used
 1863   multiple times, it will be run only once).
 1864 * When a window is zombified and automatic-rename is on, append [dead] to the
 1865   name.
 1866 * Split list-panes (alias lsp) off from list-windows.
 1867 * New pipe-pane (alias pipep) to redirect a pane output to an external command.
 1868 * Support for automatic-renames for Solaris.
 1869 * Permit attributes to be turned off in #[] by prefixing with no (eg nobright).
 1870 * Add H/M/L in vi mode, and M-R/M-r in emacs to move the cursor to the top,
 1871   middle, and bottom of the screen.
 1872 * -a option added to kill-pane to kill all except current pane.
 1873 * The -d command line flag is now gone (can be replaced by terminal-overrides).
 1874   Just use op/AX to detect default colours.
 1875 * input/tty/utf8 improvements.
 1876 * xterm-keys rewrite.
 1877 * Additional code reduction, and bug fixes.
 1878 
 1879 CHANGES FROM 0.9 TO 1.0, 20 September 2009
 1880 
 1881 * Option to alter the format of the window title set by tmux.
 1882 * Backoff for a while after multiple incorrect password attempts.
 1883 * Quick display of pane numbers (C-b q).
 1884 * Better choose-window, choose-session commands and a new choose-client command.
 1885 * Option to request multiple responses when using command-prompt.
 1886 * Improved environment handling.
 1887 * Combine wrapped lines when pasting.
 1888 * Option to override terminal settings (terminal-overrides).
 1889 * Use the full range of ACS characters for drawing pane separator lines.
 1890 * Customisable mode keys.
 1891 * Status line colour options, with embedded colours in status-left/right, and
 1892   an option to centre the window list.
 1893 * Much improved layouts, including both horizontal and vertical splitting.
 1894 * Optional visual bell, activity and content indications.
 1895 * Set the utf8 and status-utf8 options when the server is started with -u.
 1896 * display-message command to show a message in the status line, by default some
 1897   information about the current window.
 1898 * Improved current process detection on NetBSD.
 1899 * unlink-window -k is now the same as kill-window.
 1900 * attach-session now works from inside tmux.
 1901 * A system-wide configuration file, /etc/tmux.conf.
 1902 * A number of new commands in copy mode, including searching.
 1903 * Panes are now specified using the target (-t) notation.
 1904 * -t now accepts fnmatch(3) patterns and looks for prefixes.
 1905 * Translate \r into \n when pasting.
 1906 * Support for binding commands to keys without the prefix key
 1907 * Support for alternate screen (terminfo smcup/rmcup).
 1908 * Maintain data that goes off screen after reducing the window size, so it can
 1909   be restored when the size is increased again.
 1910 * New if-shell command to test a shell command before running a tmux command.
 1911 * tmux now works as the shell.
 1912 * Man page reorganisation.
 1913 * Many minor additions, much code tidying and several bug fixes.
 1914 
 1915 CHANGES FROM 0.8 TO 0.9, 01 July 2009
 1916 
 1917 * Major changes to build infrastructure: cleanup of makefiles and addition
 1918   of a configure script.
 1919 * monitor-content window option to monitor a window for a specific fnmatch(3)
 1920   pattern. The find-window command also now accepts fnmatch(3) patterns.
 1921 * previous-layout and select-layout commands, and a main-horizontal layout.
 1922 * Recreate the server socket on SIGUSR1.
 1923 * clear-history command.
 1924 * Use ACS line drawing characters for pane separator lines.
 1925 * UTF-8 improvements, and code to detect UTF-8 support by looking at
 1926   environment variables.
 1927 * The resize-pane-up and resize-pane-down commands are now merged together
 1928   into a new resize-pane command with -U and -D flags.
 1929 * confirm-before command to request a yes/no answer before executing dangerous
 1930   commands.
 1931 * Status line bug fixes, support for UTF-8 (status-utf8 option), and a key to
 1932   paste from the paste buffer.
 1933 * Support for some additional escape sequences and terminal features, including
 1934   better support for insert mode and tab stops.
 1935 * Improved window resizing behaviour, modelled after xterm.
 1936 * Some code reduction and a number of miscellaneous bug fixes.
 1937 
 1938 ================================================================================
 1939 
 1940 On 01 June 2009, tmux was imported into the OpenBSD base system. From this date
 1941 onward changes are logged as part of the normal CVS commit message to either
 1942 OpenBSD or SourceForge CVS. This file will be updated to contain a summary of
 1943 major changes with each release, and to mention important configuration or
 1944 command syntax changes during development.
 1945 
 1946 The list of older changes is below.
 1947 
 1948 ================================================================================
 1949 
 1950 21 May 2009
 1951 
 1952 * stat(2) files before trying to load them to avoid problems, for example
 1953   with "source-file /dev/zero".
 1954 
 1955 19 May 2009
 1956 
 1957 * Try to guess if the window is UTF-8 by outputting a three-byte UTF-8 wide
 1958   character and seeing how much the cursor moves. Currently tries to figure out
 1959   if this works by some stupid checks on the terminal, these need to be
 1960   rethought. Also might be better using a width 1 character rather than width 2.
 1961 * If LANG contains "UTF-8", assume the terminal supports UTF-8, on the grounds
 1962   that anyone who configures it probably wants UTF-8. Not certain if this is
 1963   a perfect idea but let's see if it causes any problems.
 1964 * New window option: monitor-content. Searches for a string in a window and if
 1965   it matches, highlight the status line.
 1966 
 1967 18 May 2009
 1968 
 1969 * main-horizontal layout and main-pane-height option to match vertical.
 1970 * New window option main-pane-width to set the width of the large left pane with
 1971   main-vertical (was left-vertical) layout.
 1972 * Lots of layout cleanup. manual layout is now manual-vertical.
 1973 
 1974 16 May 2009
 1975 
 1976 * select-layout command and a few default key bindings (M-0, M-1, M-2, M-9) to
 1977   select layouts.
 1978 * Recreate server socket on SIGUSR1, per SF feature request 2792533.
 1979 
 1980 14 May 2009
 1981 
 1982 * Keys in status line (p in vi mode, M-y in emacs) to paste the first line
 1983   of the upper paste buffer. Suggested by Dan Colish.
 1984 * clear-history command to clear a pane's history.
 1985 * Don't force wrapping with \n when asked, let the cursor code figure it out.
 1986   Should fix terminals which use this to detect line breaks.
 1987 * Major cleanup and restructuring of build infrastructure. Still separate files
 1988   for GNU and BSD make, but they are now hugely simplified at the expense of
 1989   adding a configure script which must be run before make. Now build and
 1990   install with:
 1991 
 1992 	$ ./configure && make && sudo make install
 1993 
 1994 04 May 2009
 1995 
 1996 * Use ACS line drawing characters for pane separator lines.
 1997 
 1998 30 April 2009
 1999 
 2000 * Support command sequences without a space before the semicolon, for example
 2001   "neww; neww" now works as well as "neww ; neww". "neww;neww" is still an
 2002   error.
 2003 * previous-layout command.
 2004 * Display the layout name in window lists.
 2005 * Merge resize-pane-up and resize-pane-down into resize-pane with -U and -D
 2006   flags.
 2007 
 2008 29 April 2009
 2009 
 2010 * Get rid of compat/vis.* - only one function was used which is easily
 2011   replaced,and less compat code == good.
 2012 
 2013 27 April 2009
 2014 
 2015 * Avoid using the prompt history when the server is locked, and prevent any
 2016   input entered from being added to the client's prompt history.
 2017 * New command, confirm-before (alias confirm), which asks for confirmation
 2018   before executing a command. Bound "&" and "x" by default to confirm-before
 2019   "kill-window" and confirm-before "kill-pane", respectively.
 2020 
 2021 23 April 2009
 2022 
 2023 * Support NEL, yet another way of making newline. Fixes the output from some
 2024   Gentoo packaging thing. Reported by someone on SF then logs that allowed a
 2025   fix sent by tcunha.
 2026 * Use the xenl terminfo flag to detect early-wrap terminals like the FreeBSD
 2027   console. Many thanks for a very informative email from Christian Weisgerber.
 2028 
 2029 21 April 2009
 2030 
 2031 * tmux 0.8 released.
 2032 
 2033 17 April 2009
 2034 
 2035 * Remove the right number of characters from the buffer when escape then
 2036   a cursor key (or other key prefixed by \033) is pressed. Reported by
 2037   Stuart Henderson.
 2038 
 2039 03 April 2009
 2040 
 2041 * rotate-window command. -U flag (default) for up, -D flag for down.
 2042 
 2043 02 April 2009
 2044 
 2045 * Change scroll/pane redraws to only redraw the single pane affected rather
 2046   than the entire window.
 2047 * If redrawing the region would mean redrawing > half the pane, just schedule
 2048   to redraw the entire window. Also add a flag to skip updating the window any
 2049   further if it is scheduled to be redrawn. This has the effect of batching
 2050   multiple redraws together.
 2051 
 2052 01 April 2009
 2053 
 2054 * Basic horizontal splitting and layout management. Still some redraw and other
 2055   issues - particularly, don't mix with manual pane resizing, be careful when
 2056   viewing from multiple clients and don't expect shell windows to redraw very
 2057   well after the layout is changed; generally cycling the layout a few times
 2058   will fix most problems. Getting this in for testing while I think about how
 2059   to deal with manual mode.
 2060 
 2061   Split window as normal and cycle the layouts with C-b space. Some of the
 2062   layouts will work better when swap-pane comes along.
 2063 
 2064 31 March 2009
 2065 
 2066 * AIX port, thanks to cmihai for access to a box. Only tested on 6.1 with xlc
 2067   10.1 (make sure CC is set). Needs GNU make and probably ncurses (didn't try
 2068   plain curses). Also won't build with DEBUG, so comment the FDEBUG=1 line in
 2069   GNUmakefile.
 2070 * Draw a vertical line on the right when the window size is less than the
 2071   terminal size. This is partly to shake out any horizontal limit bugs on the
 2072   way to horizontal splitting/pane tiling. Currently a bit slow since it has to
 2073   do a lot of redrawing but hopefully that will improve as I get some better
 2074   ideas for how to do it.
 2075 * Fix remaining problems with copy and paste and UTF-8.
 2076 
 2077 28 March 2009
 2078 
 2079 * Better UTF-8 support, including combined characters. Unicode data is now
 2080   stored as UTF-8 in a separate array, the code does a lookup into this every
 2081   time it gets to a UTF-8 cell. Zero width characters are just appended onto
 2082   the UTF-8 data for the previous cell. This also means that almost no bytes
 2083   extra are wasted non-Unicode data (yay).
 2084 
 2085   Still some oddities, such as copy mode skips over wide characters in a
 2086   strange way, and the code could do with some tidying.
 2087 * Key repeating is now a property of the key binding not of the command.
 2088   Repeat is turned on when the key is bound with the -r flag to bind-key.
 2089   next/previous-window no longer repeat by default as it turned out to annoy
 2090   me.
 2091 
 2092 27 March 2009
 2093 
 2094 * Clear using ED when redrawing the screen. I foolishly assumed using spaces
 2095   would be equivalent and terminals would pick up on this, but apparently not.
 2096   This fixes copy and paste in xterm/rxvt.
 2097 * Sockets in /tmp are now created in a subdirectory named, tmux-UID, eg
 2098   tmux-1000. The default socket is thus /tmp/tmux-UID/default. To start a
 2099   separate server, the new -L command line option should be used: this creates
 2100   a socket in the same directory with a different name ("-L main" will create
 2101   socket called "main"). -S should only be used to place the socket outside
 2102   /tmp. This makes sockets a little more secure and a bit more convenient to
 2103   use multiple servers.
 2104 
 2105 21 March 2009
 2106 
 2107 * New session flag "set-remain-on-exit" to set remain-on-exit flag for new
 2108   windows created in that session (like "remain-by-default" used to do). Not
 2109   perfectly happy about this, but until I can think of a good way to introduce
 2110   it generically (maybe a set of options in the session) this will do. Fixes
 2111   SF request 2527847.
 2112 
 2113 07 March 2009
 2114 
 2115 * Support for 88 colour terminals.
 2116 * break-pane command to create a new window using an existing pane.
 2117 
 2118 02 March 2009
 2119 
 2120 * Make escape key timer work properly so escape+key can be used without
 2121   lightning fast key presses.
 2122 
 2123 13 February 2009
 2124 
 2125 * Redo mode keys slightly more cleanly and apply them to command prompt
 2126   editing. vi or emacs mode is controlled by the session option status-keys.
 2127 
 2128 12 February 2009
 2129 
 2130 * Looking up argv[0] is expensive, so just use p_comm for the window name which
 2131   is good enough. Also increase name update time to 500 ms.
 2132 
 2133 11 February 2009
 2134 
 2135 * Only use ri when actually at the top of the screen; just move the cursor up
 2136   otherwise.
 2137 * FreeBSD's console wraps lines at $COLUMNS - 1 rather than $COLUMNS (the
 2138   cursor can never be beyond $COLUMNS - 1) and does not appear to support
 2139   changing this behaviour, or any of the obvious possibilities (turning off
 2140   right margin wrapping, insert mode). This is irritating, most notably because
 2141   it impossible to write to the very bottom-right of the screen without
 2142   scrolling. To work around this, if built on FreeBSD and run with a "cons"
 2143   $TERM, the bottom-right cell on the screen is omitted.
 2144 * Emulate scroll regions (slowly) to support the few terminals which don't have
 2145   it (some of which don't really have any excuse).
 2146 
 2147 10 February 2009
 2148 
 2149 * No longer redraw the status line every status-interval unless it has actually
 2150   changed.
 2151 
 2152 08 February 2009
 2153 
 2154 * Don't treat empty arguments ("") differently when parsing configuration
 2155   file/command prompt rather than command line.
 2156 * tmux 0.7 released.
 2157 
 2158 03 February 2009
 2159 
 2160 * New command, copy-buffer (alias copyb), to copy a session paste buffer to
 2161   another session.
 2162 
 2163 01 February 2009
 2164 
 2165 * The character pair #(command) may now contain (escaped) right parenthesis.
 2166 
 2167 30 January 2009
 2168 
 2169 * . now bound to "command-prompt 'move-window %%'" by default, from joshe.
 2170 
 2171 29 January 2009
 2172 
 2173 * Window options to set status line fg, bg and attributes for a single
 2174   window. Options are: window-status-fg, window-status-bg,
 2175   window-status-attr. Set to "default" to use the session status colours.
 2176 
 2177   This allows quite neat things like:
 2178 
 2179 	$ cat ~/bin/xssh
 2180 	#!/bin/sh
 2181 
 2182 	if [ ! -z "$TMUX" ]; then
 2183 	case "$1" in
 2184     	natalya)
 2185 	        tmux setw window-status-fg red >/dev/null
 2186 		;;
 2187 	natasha)
 2188         	tmux setw window-status-fg yellow >/dev/null
 2189 		;;
 2190 	esac
 2191 	fi
 2192 	ssh "$@"
 2193 	[ ! -z "$TMUX" ] && tmux setw -u window-status-fg >/dev/null
 2194 	$ alias ssh="~/bin/xssh"
 2195 
 2196 * Support #(command) in status-left, and status-right, which is displayed as
 2197   the first line of command's output (e.g. set -g status-right
 2198   "#(whoami)@#(hostname -s)"). Commands with )s aren't supported.
 2199 
 2200 28 January 2009
 2201 
 2202 * Support mouse in copy mode to move cursor. Can't do anything else at the
 2203   moment until other mouse modes are handled.
 2204 * Better support for at least the most common variant of mouse input: parse it
 2205   and adjust for different panes. Also support mouse in window/session choice
 2206   mode.
 2207 
 2208 27 January 2009
 2209 
 2210 * Bring back the fancy window titles with session/window names: it is easy to
 2211   work around problems with elinks (see FAQ).
 2212 * -u flag to scroll-mode and copy-mode to start scrolled one page
 2213   up. scroll-mode -u is bound to prefix,page-up (ppage) by default.
 2214 * Allow status, mode and message attributes to be changed by three new options:
 2215   status-attr, mode-attr, message-attr. A comma-separated list is accepted
 2216   containing: bright, dim, underscore, blink, reverse, hidden, italics, for
 2217   example:
 2218 
 2219 	set -g status-attr bright,blink
 2220 
 2221   From Josh Elsasser, thanks!
 2222 
 2223 26 January 2009
 2224 
 2225 * Be more clever about picking the right process to create the window name.
 2226 * Don't balls up the terminal on UTF-8 combined characters. Don't support them
 2227   properly either - they are just discarded for the moment.
 2228 
 2229 25 January 2009
 2230 
 2231 * load-buffer command
 2232 
 2233 23 January 2009
 2234 
 2235 * Use reverse colours rather than swapping fg and bg for message, mode and
 2236   status line. This makes these usable on black and white terminals.
 2237 * Better error messages when creating a session or window fails.
 2238 * Oops. Return non-zero on error. Reported by Will Maier.
 2239 
 2240 21 January 2009
 2241 
 2242 * Handle SIGTERM (and kill-server which uses it), a bit more neatly - tidy
 2243   up properly and print a nicer message. Same effect though :-).
 2244 * new-window now supports -k to kill target window if it exists.
 2245 * Bring back split-window -p and -l options to specify the height a percentage
 2246   or as a number of lines.
 2247 * Make window and session choice modes allow you to choose items in vi keys
 2248   mode (doh!). As a side-effect, this makes enter copy selection (as well
 2249   as C-w/M-w) when using emacs keys in copy mode. Reported by merdely.
 2250 
 2251 20 January 2009
 2252 
 2253 * Darwin support for automatic-rename from joshe; Darwin doesn't seem to have
 2254   a sane method of getting argv[0] and searching for the precise insane way
 2255   is too frustrating, so this just uses the executable name.
 2256 * Try to change the window title to match the command running it in. This is
 2257   done by reading argv[0] from the process group leader of the group that owns
 2258   the tty (tcgetpgrp()). This can't be done portably so some OS-dependent code
 2259   is introduced (ugh); OpenBSD, FreeBSD and Linux are supported at the moment.
 2260 
 2261   A new window flag, automatic-rename, is available: if this is set to off, the
 2262   window name is not changed. Specifying a name with the new-window,
 2263   new-session or rename-window commands will automatically set this flag to off
 2264   for the window in question. To disable it entirely set the option to off
 2265   globally (setw -g automatic-rename off).
 2266 
 2267 19 January 2009
 2268 
 2269 * Fix various stupid issues when the status line is turned off. Grr.
 2270 * Use reverse attributes for clock and cursor, otherwise they do not
 2271   appear on black and white terminals.
 2272 * An error in a command sequence now stops execution of that sequence.
 2273   Internally, each command code now passes a return code back rather than
 2274   talking to the calling client (if any) directly.
 2275 * attach-session now tries to start the server if it isn't already started - if
 2276   no sessions are created in .tmux.conf this will cause an error.
 2277 * Clean up starting server by making initial client get a special socketpair.
 2278 
 2279 18 January 2009
 2280 
 2281 * Unbreak UTF-8.
 2282 * -a flag to next-window and previous-window to select the next or previous
 2283   window with activity or bell. Bound to M-n and M-p.
 2284 * find-window command to search window names, titles and visible content (but
 2285   not history) for a string. If only one is found, the window is selected
 2286   otherwise a choice list is shown. This (as with the other choice commands)
 2287   only works from a key. Bound to "f" by default.
 2288 * Cleaned up command printing code, also enclose arguments with spaces in "s.
 2289 * Added command sequences. These are entered by separating each argument by a ;
 2290   argument (spaces on both sides), for example:
 2291 
 2292 	lsk ; lsc
 2293 
 2294   To use a literal ; as the argument prefix it with \, for example:
 2295 
 2296 	bind x lsk \; lsc
 2297 
 2298   Commands are executed from left to right. Also note that command sequences do
 2299   not support repeat-time repetition unless all commands making up the sequence
 2300   support it.
 2301 * suspend-client command to suspend a client. Don't try to background it
 2302   though...
 2303 * Mark attached sessions in sessions lists. Suggested by Simon Kuhnle.
 2304 
 2305 17 January 2009
 2306 
 2307 * tmux 0.6 released.
 2308 
 2309 15 January 2009
 2310 
 2311 * Support #H for hostname and #S for session name in status-left/right.
 2312 * Two new commands, choose-window and choose-session which work only when bound
 2313   to a key and allow the window or session to be selected from a list. These
 2314   are now bound to "w" and "s" instead of the list commands.
 2315 
 2316 14 January 2009
 2317 
 2318 * Rework the prefix-time stuff. The option is now called repeat-time and
 2319   defaults to 500 ms. It only applies to a small subset of commands, currently:
 2320   up-pane, down-pane, next-window, previous-window, resize-pane-up,
 2321   resize-pane-down. These are the commands for which it is obviously useful,
 2322   having it for everything else was just bloody annoying.
 2323 * The alt-up and alt-down keys now resize a pane by five lines at a time.
 2324 * switch-pane is now select-pane and requires -p to select a pane. The
 2325   "o" key binding is changed to down-pane.
 2326 * up-pane and down-pane commands, bound to arrow up and down by default.
 2327 * Multiple vertical window splitting. Minimum pane size is four lines, an
 2328   (unhelpful) error will be shown if attempting to split a window with less
 2329   that eight lines. If the window is resized, as many panes are shown as can
 2330   fit without reducing them below four lines. There is (currently!) not a way
 2331   to show a hidden pane without making the window larger.
 2332 
 2333   Note the -p and -l options to split-window are now gone, these may reappear
 2334   once I think them through again.
 2335 * Server locking on inactivity (lock-after-time) is now disabled by default.
 2336 
 2337 13 January 2009
 2338 
 2339 * kill-pane command.
 2340 
 2341 12 January 2009
 2342 
 2343 * command-prompt now accepts a single argument, a template string. Any
 2344   occurrences of %% in this string are replaced by whatever is entered at the
 2345   prompt and the result is executed as a command. This allows things like (now
 2346   bound by default):
 2347 
 2348   	 bind , command-prompt "rename-window %%"
 2349 
 2350   Or my favourite:
 2351 
 2352          bind x command-prompt "split-window 'man %%'"
 2353 
 2354 * Option to set prefix time, allowing multiple commands to be entered without
 2355   pressing the prefix key again, so long as they each typed within this time of
 2356   each other.
 2357 * Yet more hacks for key handling. Think it is just about working now.
 2358 * Two commands, resize-pane-up and resize-pane-down to resize a pane.
 2359 * Make the window pane code handle panes of different sizes, and add a -l
 2360   and -p arguments to split-window to specify the new window size in lines
 2361   or as a percentage.
 2362 
 2363 11 January 2009
 2364 
 2365 * Vertical window splitting. Currently can only split a window into two panes.
 2366   New split-window command splits (bound to ") and switch-pane command (bound to
 2367   o) switches between panes.
 2368 
 2369   close-pane, swap-pane commands are to follow. Also to come are pane resizing,
 2370   >2 panes, the ability to break a pane out to a full window and vice versa and
 2371   possibly horizontal splitting.
 2372 
 2373   Panes are subelements of windows rather than being windows in their own
 2374   right. I tried to make them windows (so the splitting was at the session or
 2375   client level) but this rapidly became very complex and invasive. So in the
 2376   interests of having something working, I just made it so each window can have
 2377   two child processes instead of one (and it still took me 12 hours straight
 2378   coding). Now the concept is proven and much of the support code is there,
 2379   this may change in future if more flexibility is needed.
 2380 * save-buffer command, from Tiago Cunha.
 2381 
 2382 10 January 2009
 2383 
 2384 * New option, lock-after-time. If there is no activity in the period specified
 2385   by this option (in seconds), tmux will lock the server. Default is 1800 (30
 2386   minutes), set to 0 to disable.
 2387 * Server locking. Two new commands: set-password to set a password (a
 2388   preencrypted password may be specified with -c); and lock-server to lock the
 2389   server until the password is entered. Also an additional command line flag,
 2390   -U, to unlock from the shell. The default password is blank (any password
 2391   accepted). If specifying an encrypted password from encrypt(1) in .tmux.conf
 2392   with -c, don't forget to enclose it in single-quotes (') to prevent shell
 2393   variable expansion.
 2394 * If a window is created from the command line, tmux will now use the same
 2395   current working directory for the new process. A new default-path option to
 2396   sets the working directory for processes created from keys or interactively
 2397   from the prompt.
 2398 * New mode to display a large clock. Entered with clock-mode command (bound to
 2399   C-b t by default); two window options: clock-mode-colour and clock-mode-style
 2400   (12 or 24). This will probably be used as the basis for window locking.
 2401 * New command, server-info, to show some server information and terminal
 2402   details.
 2403 
 2404 09 January 2009
 2405 
 2406 * Stop using ncurses variables and instead build a table of the codes we want
 2407   into an array for each terminal type. This makes the code a little more
 2408   untidy in places but gets rid of the awful global variables and calling
 2409   setterm all the time, and shoves all the ncurses-dependent mess into a single
 2410   file, tty-term.c. It also allows overriding single terminal codes, this is
 2411   used to fix rxvt on some platforms (where it is missing dch) and in future
 2412   may allow user customisation a la vim.
 2413 * Update key handling code. Simplify, support ctrl properly and add a new
 2414   window option (xterm-keys) to output xterm key codes including ctrl and,
 2415   if available, alt and shift.
 2416 
 2417 08 January 2009
 2418 
 2419 * If built without DEBUG (the release versions), don't cause a fatal error if
 2420   the grid functions notice an input error, just log and ignore the
 2421   request. This might mean me getting shouted at less often when bugs kill
 2422   long-running sessions, at least in release versions.
 2423 * Hopefully fix cursor out-of-bounds checking when writing to grid. When I
 2424   wrote the code I must have forgotten that the cursor can be one cell off the
 2425   right of the screen (yes, I know), so there were number of out-of-bounds/
 2426   overflow problems.
 2427 
 2428 07 January 2009
 2429 
 2430 * New flag to set and setw, -u, to unset an option (allowing it to inherit from)
 2431   the global options again.
 2432 * Added more info messages for options changes.
 2433 * A bit of tidying and reorganisation of options code.
 2434 
 2435 06 January 2009
 2436 
 2437 * Don't crash when backspacing if cursor is off the right of the screen,
 2438   reported by David Chisnall.
 2439 * Complete words at any point inside command in prompt, also use option name
 2440   as well as command names.
 2441 * Per-client prompt history of up to 100 items.
 2442 * Use a splay tree for key bindings instead of an array. As a side-effect this
 2443   sorts them when listed.
 2444 
 2445 22 December 2008
 2446 
 2447 * Use the right keys for home and end.
 2448 
 2449 20 December 2008
 2450 
 2451 * Add vim mode for tmux configuration file to examples/, from Tiago Cunha.
 2452 
 2453 15 December 2008
 2454 
 2455 * New command, source-file (alias source), to load a configuration
 2456   file. Written by Tiago Cunha, many thanks.
 2457 
 2458 13 December 2008
 2459 
 2460 * Work around lack of dch. On Linux, the rxvt termcap doesn't have it (it is
 2461   lying, but we can't really start disbelieving termcaps...). This is a bit
 2462   horrible - I can see no way to do it without pretty much redrawing the whole
 2463   line, but it works...
 2464 
 2465 10 December 2008
 2466 
 2467 * glibc's getopt(3) is useless: it is not POSIX compliant without jumping
 2468   through non-portable hoops, and the method of resetting it is unclear (the
 2469   man page on my system says set optind to 1, but other sources say 0). So,
 2470   import OpenBSD's getopt_long.c into compat/ for use on Linux and use the
 2471   clearly documented optreset = optind = 1 method. This fixes some strange
 2472   issues with command parsing (getting the syntax wrong would prevent any
 2473   further commands being parsed).
 2474 
 2475 06 December 2008
 2476 
 2477 * Bring set/setw/show/showw into line with other commands. This means that by
 2478   default they now affect the current window (if any); the new -g flag must be
 2479   passed to set the global options. This changes the behaviour of set/show and
 2480   WILL BREAK CURRENT CONFIGURATIONS.
 2481 
 2482   In summary, whether in the configuration file, the command prompt, or a key
 2483   binding, use -g to set a global option, use -t to specify a particular window
 2484   or session, or omit both to try and use the current window or session.
 2485 
 2486   This makes set/show a bit of a pain but is the correct behaviour for
 2487   setw/showw and is the same as every other command, so we can put up with a
 2488   bit of pain for consistency.
 2489 * Redo window options. They now work in the same way to session options with a
 2490   global options set. showw/setw commands now have similar syntax to show/set
 2491   (including the ability to use abbreviations).
 2492 
 2493   PLEASE NOTE this includes the following configuration-breaking changes:
 2494 
 2495   - remain-by-default is now GONE, use "setw -g remain-on-exit" to apply the
 2496     global window option instead;
 2497   - mode-keys is now a window option rather than session - use "setw [-g]
 2498     mode-keys" instead of set.
 2499 
 2500   There are also some additions:
 2501 
 2502   - message-fg and message-bg session options to control status line message
 2503     colours;
 2504   - mode-fg and mode-bg window options to set colours in window modes such as
 2505     copy mode.
 2506 
 2507   The options code still a mess and now there is twice as much of it :-(.
 2508 
 2509 02 December 2008
 2510 
 2511 * Add support for including the window title in status-left or status-right
 2512   strings by including the character pair "#T". This may be prefixed with
 2513   a number to specify a maximum length, for example "#24T" to use at most
 2514   24 characters of the title.
 2515 * Introduce two new options, status-left-length and status-right-length,
 2516   control the maximum length of left and right components of the status bar.
 2517 * elinks (and possibly others) bypass the terminal and talk directly to X to
 2518   restore the window title when exiting. tmux can't know about this particular
 2519   bit of stupidity so the title ends up strange - the prefix isn't terribly
 2520   important and elinks is quite useful so just get rid of it.
 2521 
 2522 27 November 2008
 2523 
 2524 * Tweaks to support Dragonfly.
 2525 
 2526 17 November 2008
 2527 
 2528 * tmux 0.5 released.
 2529 
 2530 16 November 2008
 2531 
 2532 * New window option: "utf8"; this must be on (it is off by default) for UTF-8
 2533   to be parsed. The global/session option "utf8-default" controls the setting
 2534   for new windows.
 2535 
 2536   This means that by default tmux does not handle UTF-8. To use UTF-8 by
 2537   default it is necessary to a) "set utf8-default on" in .tmux.conf b) start
 2538   tmux with -u on any terminal which support UTF-8.
 2539 
 2540   It seems a bit unnecessary for this to be a per-window option but that is
 2541   the easiest way to do it, and it can't do any harm...
 2542 * Enable default colours if op contains \033[39;49m, based on a report from
 2543   fulvio ciriaco.
 2544 
 2545 12 November 2008
 2546 
 2547 * Keep stack of last windows rather than just most recent; based on a diff from
 2548   joshe.
 2549 
 2550 04 November 2008
 2551 
 2552 * Don't try to redraw status line when showing a prompt or message; if it does,
 2553   the status timer is never reset so it redraws on every loop. Spotted by
 2554   joshe.
 2555 
 2556 09 October 2008
 2557 
 2558 * Translate 256 colours into 16 if 256 is not available, same as screen does.
 2559 * Better support for OSC command (only to set window title now), and also
 2560   support using APC for the same purpose (some Linux default shell profiles do
 2561   this).
 2562 
 2563 25 September 2008
 2564 
 2565 * Large internal rewrite to better support 256 colours and UTF-8. Screen data
 2566   is now stored as single two-way array of structures rather than as multiple
 2567   separate arrays. Also simplified a lot of code.
 2568 
 2569   Only external changes are three new flags, -2, -d and -u, which force tmux to
 2570   assume the terminal supports 256 colours, default colours (useful for
 2571   xterm-256color which lacks the AX flag), or UTF-8 respectively.
 2572 
 2573 10 September 2008
 2574 
 2575 * Split off colour conversion code from screen code.
 2576 
 2577 09 September 2008
 2578 
 2579 * Initial UTF-8 support. A bit ugly and with a limit of 4096 UTF-8
 2580   characters per window.
 2581 
 2582 08 September 2008
 2583 
 2584 * 256 colour support. tmux attempts to autodetect the terminal by looking
 2585   both at what ncurses reports (usually wrong for xterm) and checking if
 2586   the TERM contains "256col". For xterm TERM=xterm-256color is needed (as
 2587   well as a build that support 256 colours); this seems to work for rxvt
 2588   as well. On non-256 colour terminals, high colours are translated to white
 2589   foreground and black background.
 2590 
 2591 28 August 2008
 2592 
 2593 * Support OS X/Darwin thanks to bsd-poll.c from OpenSSH. Also convert
 2594   from clock_gettime(2) to gettimeofday(2) as OS X doesn't support the
 2595   former; microsecond accuracy will have to be sufficient ;-).
 2596 
 2597 07 August 2008
 2598 
 2599 * Lose some unused/useless wrapper functions.
 2600 
 2601 25 July 2008
 2602 
 2603 * Shell variables may now be defined and used in configuration file. Define
 2604   variables with:
 2605 
 2606 	VAR=1
 2607 
 2608   And use with:
 2609 
 2610         renamew ${VAR}
 2611 	renamew "x${VAR}x"
 2612 
 2613  Also some other fixes to make, for example, "abc""abc" work similarly to
 2614  the shell.
 2615 
 2616 24 July 2008
 2617 
 2618 * Finally lose inconsistently-used SCREEN_DEF* defines.
 2619 * If cursor mode is on, switch the arrow keys from \033[A to \033OA.
 2620 * Support the numeric keypad in both application and numbers mode. This is
 2621   different from screen which always keeps it in application mode.
 2622 
 2623 19 July 2008
 2624 
 2625 * Unbreak "set status" - tmux thought it was ambiguous, reported by rivo nurges.
 2626 
 2627 02 July 2008
 2628 
 2629 * Split vi and emacs mode keys into two tables and add an option (mode-keys)
 2630   to select between them. Default is emacs, use,
 2631 
 2632      tmux set mode-keys vi
 2633 
 2634   to change to vi.
 2635 
 2636   vi mode uses space to start selection, enter to copy selection and escape
 2637   to clear selection.
 2638 
 2639 01 July 2008
 2640 
 2641 * Protocol versioning. Clients which identify as a different version from the
 2642   server will be rejected.
 2643 * tmux 0.4 released.
 2644 
 2645 29 June 2008
 2646 
 2647 * Zombie windows. These are not closed when the child process dies. May be
 2648   set for a window with the new "remain-on-exit" option; the default setting
 2649   of this flag for new windows may be set with the "remain-by-default" session
 2650   option.
 2651 
 2652   A window may be restarted with the respawn-window command:
 2653 
 2654   	respawn-window [-k] [command]
 2655 
 2656   If -k is given, any existing process running in the window is killed;
 2657   if command is omitted, the same command as when the window was first
 2658   created is used.
 2659 
 2660 27 June 2008
 2661 
 2662 * Handle nonexistent session or client to -t properly.
 2663 
 2664 25 June 2008
 2665 
 2666 * select-prompt command to allow a window to be selected at a prompt. Only
 2667   windows in the current session may be selected. Bound to ' by default.
 2668   Suggested by merdely.
 2669 * move-window command. Requested by merdely.
 2670 * Support binding alt keys (prefixed with M-). Change default to use
 2671   C- for ctrl keys (^ is still accepted as an alternative).
 2672 * Slim down default key bindings: support lowercase only.
 2673 * Handle escaped keys properly (parse eg \033b into a single key code) and
 2674   use this to change copy mode next/previous work to M-f and M-b to match
 2675   emacs.
 2676 
 2677 24 June 2008
 2678 
 2679 * Next word (C-n/w) and previous word (C-b/b) in copy mode.
 2680 
 2681 23 June 2008
 2682 
 2683 * list-commands command (alias lscm).
 2684 * Split information about options into a table and use it to parse options
 2685   on input (allowing abbreviations) and to print them with show-options
 2686   (meaning that bell-action gets a proper string). This turned out a bit ugly
 2687   though :-/.
 2688 
 2689 22 June 2008
 2690 
 2691 * Do not translate black and white into default if the terminal supports
 2692   default colours. This was nice to force programs which didn't use default
 2693   colours to be properly transparent in rxvt/aterm windows with a background
 2694   image, but it causes trouble if someone redefines the default foreground and
 2695   background (to have black on white or something).
 2696 
 2697 21 June 2008
 2698 
 2699 * Naive tab completion in the command prompt. This only completes command
 2700   names if a) they are at the start of the text b) the cursor is at
 2701   the end of the text c) the text contains no spaces.
 2702 * Only attempt to set the title where TERM looks like an xterm (contains
 2703   "xterm", "rxvt" or is "screen"). I hate this but I don't see a better way:
 2704   setting the title actually kills some other terminals pretty much dead.
 2705 * Strip padding out of terminfo(5) strings. Currently the padding is just
 2706   ignored, this may need to be altered if there are any software terminals
 2707   out there that actually need it.
 2708 
 2709 20 June 2008
 2710 
 2711 * buffer-limit option to set maximum size of buffer stack. Default is 9.
 2712 * Initial buffer improvements. Each session has a stack of buffers and each
 2713   buffer command takes a -b option to manipulate items on the stack. If -b
 2714   is omitted, the top entry is used. The following commands are currently
 2715   available:
 2716 
 2717 	set-buffer [-b index] [-t target-session] string
 2718 	paste-buffer [-d] [-b index] [-t target-window]
 2719 	delete-buffer [-b index] [-t target-session]
 2720 	show-buffers [-t target-session]
 2721 	show-buffer [-b index] [-t target-session]
 2722 
 2723   -d to paste-buffer deletes the buffer after pasting it.
 2724 * New option, display-time, sets the time status line messages stay on screen
 2725   (unless a key is pressed). Set in milliseconds, default is 750 (0.75 seconds).
 2726   The timer is only checked every 100 ms or so.
 2727 
 2728 19 June 2008
 2729 
 2730 * Use "status" consistently for status line option, and prefix for "prefix" key
 2731   option.
 2732 * Allow commands to be entered at a prompt. This is triggered with the
 2733   command-prompt command, bound to : by default.
 2734 * Show status messages properly, without blocking the server.
 2735 
 2736 18 June 2008
 2737 
 2738 * New option, set-titles. On by default, this attempts to set the window title
 2739   using the \e]2;...\007 xterm code.
 2740 
 2741   Note that elinks requires the STY environment variable (used by screen) to be
 2742   set before it will set the window title. So, if you want window titles set by
 2743   elinks, set STY before running it (any value will do). I can't do this for all
 2744   windows since setting it to an invalid value breaks screen.
 2745 * Show arrows at either end of status line when scrolled if more windows
 2746   exist. Highlight the arrow if a hidden window has activity or bell.
 2747 * Scroll the status line to show the current window if necessary. Also handle
 2748   windows smaller than needed better (show a blank status line instead of
 2749   hanging or crashing).
 2750 
 2751 17 June 2008
 2752 
 2753 * tmux 0.3 released.
 2754 
 2755 16 June 2008
 2756 
 2757 * Add some information messages when window options are changed, suggested by
 2758   Mike Erdely. Also add a -q command-line option to suppress them.
 2759 * show-window-options (showw) command.
 2760 
 2761 15 June 2008
 2762 
 2763 * show-options (show) command to show one or all options.
 2764 
 2765 14 June 2008
 2766 
 2767 * New window options: force-width and force-height. This will force a window
 2768   to an arbitrary width and height (0 for the default unlimited). This is
 2769   neat for emacs which doesn't have a sensible way to force hard wrapping at 80
 2770   columns. Also, don't try to be clever and use clr_eol when redrawing the
 2771   whole screen, it causes trouble since the redraw functions are used to draw
 2772   the blank areas too.
 2773 * Clear the blank area below windows properly when they are smaller than client,
 2774   also add an indicator line to show the vertical limit.
 2775 * Don't die on empty strings in config file, reported by Will Maier.
 2776 
 2777 08 June 2008
 2778 
 2779 * Set socket mode +x if any sessions are attached and -x if not.
 2780 
 2781 07 June 2008
 2782 
 2783 * Make status-interval actually changeable.
 2784 
 2785 06 June 2008
 2786 
 2787 * New window option: aggressive-resize. Normally, windows are resized to the
 2788   size of the smallest attached session to which they are linked. This means a
 2789   window only changes size when sessions are detached or attached, or they are
 2790   linked or unlinked from a session. This flag changes a window to be the size
 2791   of the smallest attached session for which it is the current window - it is
 2792   resized every time a session changes to it or away from it. This is nice for
 2793   things that handle SIGWINCH well (like irssi) and bad for things like shells.
 2794 * The server now exits when no sessions remain.
 2795 * Fix bug with inserting characters with TERM=xterm-color.
 2796 
 2797 05 June 2008
 2798 
 2799 * Completely reorganise command parsing. Much more common code in cmd-generic.c
 2800   and a new way of specifying windows, clients or sessions. Now, most commands
 2801   take a -t argument, which specifies a client, a session, or a window target.
 2802   Clients and sessions are given alone (sessions are fnmatch(3)d and
 2803   clients currently not), windows are give by (client|session):index. For
 2804   example, if a user is in session "1" window 0 on /dev/ttypi, these should all
 2805   be equivalent:
 2806 
 2807 	tmux renamew newname			(current session and window)
 2808 	tmux renamew -t: newname		(current session and window)
 2809 	tmux renamew -t:0 newname		(current session, window 0)
 2810 	tmux renamew -t0 newname		(current session, window 0)
 2811 	tmux renamew -t1:0 newname		(session 1, window 0)
 2812 	tmux renamew -t1: newname		(session 1's current window)
 2813 	tmux renamew -t/dev/ttypi newname	(client /dev/ttypi's current
 2814 						 session and window)
 2815 	tmux renamew -t/dev/ttypi: newname	(client /dev/ttypi's current
 2816 						 session and window)
 2817 	tmux renamew -t/dev/ttypi:0 newname	(client /dev/ttypi's current
 2818 						 session, window 0)
 2819 
 2820   This does have some downsides, for example, having to use -t on selectw,
 2821 
 2822 	tmux selectw -t7
 2823 
 2824   is annoying. But then using non-flagged arguments would mean renaming the
 2825   current window would need to be something like:
 2826 
 2827 	tmux renamew : newname
 2828 
 2829   It might be better not to try and be so consistent; comments to the usual
 2830   address ;-).
 2831 * Infrastructure for printing arguments in list-keys output. Easy ones only for
 2832   now.
 2833 
 2834 04 June 2008
 2835 
 2836 * Add some vi(1) key bindings in copy mode, and support binding ^[, ^\, ^]
 2837   ^^ and ^_. Both from/prompted by Will Maier.
 2838 * setw monitor-activity and set status without arguments now toggle the current
 2839   value; suggested by merdely.
 2840 * New command set-window-option (alias setw) to set the single current window
 2841   option: monitor-activity to determine whether window activity is shown in
 2842   the status bar for that window (default off).
 2843 * Change so active/bell windows are inverted in status line.
 2844 * Activity monitoring - window with activity are marked in status line. No
 2845   way to disable this/filter windows yet.
 2846 * Brought select-window command into line with everything else; it now uses
 2847   -i for the window index.
 2848 * Strings to display on the left and right of the status bar may now be set
 2849   with the status-left and status-right options. These are passed through
 2850   strftime(3) before being displayed. The status bar is automatically updated
 2851   at an interval set by the status-interval option. The default is to display
 2852   nothing on the left and the date and time on the left; the default update
 2853   interval is 15 seconds.
 2854 
 2855 03 June 2008
 2856 
 2857 * Per session options. Setting options without specifying a session sets the
 2858   global options as normal (global options are inherited by all sessions);
 2859   passing -c or -s will set the option only for that session.
 2860 * Because a client has a session attached, any command needing a session can
 2861   take a client and use its session. So, anything that used to accept -s now
 2862   accepts -c as well.
 2863 * -s to specify session name now supports fnmatch(3) wildcards; if multiple
 2864   sessions are found, or if no -s is specified, the most newly created is used.
 2865 * If no command is specified, assume new-session. As a byproduct, clean up
 2866   command default values into separate init functions.
 2867 * kill-server command.
 2868 
 2869 02 June 2008
 2870 
 2871 * New command, start-server (alias "start"), to start the tmux server and do
 2872   nothing else. This is good if you have a configuration file which creates
 2873   windows or sessions (like me): in that case, starting the server the first
 2874   time tmux new is run is bad since it creates a new session and window (as
 2875   it is supposed to - starting the server is a side-effect).
 2876 
 2877   Instead, I have a little script which does the equivalent of:
 2878 
 2879   	tmux has -s0 2>/dev/null || tmux start
 2880   	tmux attach -d -s0
 2881 
 2882   And I use it to start the server if necessary and attach to my primary
 2883   session.
 2884 * Basic configuration file in ~/.tmux.conf or specified with -f. This is file
 2885   contains a set of tmux commands that are run the first time the server is
 2886   started. The configuration commands are executed before any others, so
 2887   if you have a configuration file that contains:
 2888 
 2889 	new -d
 2890 	neww -s0
 2891 
 2892   And you do the following without an existing server running:
 2893 
 2894 	tmux new
 2895 
 2896   You will end up with two sessions, session 0 with two windows (created by
 2897   the configuration file) and your client attached to session 1 with one
 2898   window (created by the command-line command). I'm not completely happy with
 2899   this, it seems a little non-obvious, but I haven't yet decided what to do
 2900   about it.
 2901 
 2902   There is no environment variable handling or other special stuff yet.
 2903 
 2904   In the future, it might be nice to be able to have per-session configuration
 2905   settings, probably by having conditionals in the file (so you could, for
 2906   example, have commands to define a particular window layout that would only
 2907   be invoked if you called tmux new -smysession and mysession did not already
 2908   exist).
 2909 * BIG CHANGE: -s and -c to specify session name and client name are now passed
 2910   after the command rather than before it. So, for example:
 2911 
 2912 	tmux -s0 neww
 2913 
 2914   Becomes:
 2915 
 2916 	tmux neww -s0
 2917 
 2918   This is to allow them to be used in the (forthcoming) configuration file
 2919   THIS WILL BREAK ANY CURRENT SCRIPTS OR ALIASES USING -s OR -c.
 2920 
 2921 01 June 2008
 2922 
 2923 * Bug fix: don't die if -k passed to link-window and the destination doesn't
 2924   exist.
 2925 * New command, send-keys, will send a set of keys to a window.
 2926 
 2927 31 May 2008
 2928 
 2929 * Fix so tmux doesn't hang if the initial window fails for some reason. This
 2930   was highlighted by problems on Darwin, thanks to Elias Pipping for the report
 2931   and access to a test account. (tmux still won't work on Darwin since its
 2932   poll(2) is broken.)
 2933 
 2934 02 January 2008
 2935 
 2936 * Don't attempt to reset the tty on exit if it has been closed externally.
 2937 
 2938 06 December 2007
 2939 
 2940 * Restore checks for required termcap entries and add a few more obvious
 2941   emulations.
 2942 * Another major reorganisation, this time of screen handling. A new set of
 2943   functions, screen_write_*, are now used to write to a screen and a tty
 2944   simultaneously. These are used by the input parser to update the base
 2945   window screen and also by the different modes which now interpose their own
 2946   screen.
 2947 
 2948 30 November 2007
 2949 
 2950 * Support \ek...\e\ to set window name.
 2951 
 2952 27 November 2007
 2953 
 2954 * Enable/disable mouse when asked, if terminal claims to support it. Mouse
 2955   sequences are just passed through unaltered for the moment.
 2956 * Big internal reorganisation. Rather than leaving control of the tty solely in
 2957   the client and piping all data through a socket to it, change so that the
 2958   server opens the tty again and reads and writes to it directly. This avoids
 2959   a lot of buffering and copying. Also reorganise the redrawing stuff so that
 2960   everything goes through screen_draw_* - this makes the code simpler, but
 2961   still needs broken up more, and all the ways of writing to screens should be
 2962   more consistent.
 2963 
 2964 26 November 2007
 2965 
 2966 * Rather than shifting up one line at a time once the history is full,
 2967   shift by 10% of the history each time. This is faster.
 2968 * Add ^A and ^E to copy mode to move to start-of-line/end-of-line.
 2969 
 2970 24 November 2007
 2971 
 2972 * Support for alt charset mode (VT100 graphics characters).
 2973 
 2974 23 November 2007
 2975 
 2976 * Mostly complete copy & paste. Copy mode entered with C-b [ (copy-mode
 2977   command). In copy mode, arrow keys/page up/page down/hjkl/C-u/C-f navigate,
 2978   space or C-space starts selection, and enter or C-w copies and (important!)
 2979   exits copy mode. C-b ] (paste-buffer) pastes into current window. No
 2980   extra utility keys (bol/eol/clear selection/etc), only one single buffer,
 2981   and no buffer manipulation commands (clear/view/etc) yet. The code is also
 2982   fugly :-(.
 2983 * history-limit option to set maximum history. Does not apply retroactively to
 2984   existing windows! Lines take up a variable amount of space, but a reasonable
 2985   guess for an 80-column terminal is 250 KB per 1000 lines (of history used,
 2986   an empty history takes no space).
 2987 
 2988 21 November 2007
 2989 
 2990 * Create every line as zero length and only expand it as data is written,
 2991   rather than creating at full size immediately.
 2992 * Make command output (eg list-keys) go to a scrollable window similar to
 2993   scroll mode.
 2994 * Redo screen redrawing so it is a) readable b) split into utility functions
 2995   that can be used outside screen.c. Use these to make scroll mode only
 2996   redraw what it has to which gets rid of irritating flickering status box and
 2997   makes it much faster.
 2998 * Full line width memory and horizontal scrolling in history.
 2999 * Initial support for scroll history. = to enter scrolling mode, and then
 3000   vi keys or up/down/pgup/pgdown to navigate. Q to exit. No horizontal history
 3001   yet (need per-line sizes) and a few kinks to be worked out (resizing while in
 3002   history mode will probably cause trouble).
 3003 
 3004 20 November 2007
 3005 
 3006 * Fix format string error with "must specify a client" message. Also
 3007   sprinkle some printflike tags.
 3008 * tmux 0.1 released.
 3009 
 3010 17 November 2007
 3011 
 3012 * (nicm) Add -k option to link-window to kill target window if it exists.
 3013 
 3014 16 November 2007
 3015 
 3016 * (nicm) Split in-client display into two columns. This is a hack but not a lot
 3017   more so than that bit is already and it helps with lots of keys.
 3018 * (nicm) switch-client command to switch client between different sessions. This
 3019   is pretty cool:
 3020 
 3021 	$ tmux bind q switch 0
 3022 	$ tmux bind w switch 1
 3023 
 3024   Then you can switch between sessions 0 and 1 with a key :-).
 3025 * (nicm) Accept "-c client-tty" on command line to allow client manipulation
 3026   commands, and change detach-/refresh-session to detach-/refresh-client (this
 3027   loses the -a behaviour, but at some point -session versions may return, and
 3028   -c will allow fnmatch(3)).
 3029 * (nicm) List available commands on ambiguous command.
 3030 
 3031 12 November 2007
 3032 
 3033 * (nicm) If the terminal supports default colours (AX present), force black
 3034   background and white foreground to default. This is useful on transparent
 3035   *terms for programs which don't do it themselves (like most(1)).
 3036 * (nicm) Fill in the rest of the man page.
 3037 * (nicm) kill-session command.
 3038 
 3039 09 November 2007
 3040 
 3041 * (nicm) C-space is now "^ " not "^@".
 3042 * (nicm) Support tab (\011).
 3043 * (nicm) Initial man page outline.
 3044 * (nicm) -V to show version.
 3045 * (nicm) rename-session command.
 3046 
 3047 08 November 2007
 3048 
 3049 * (nicm) Check for required terminal capabilities on start.
 3050 
 3051 31 October 2007
 3052 
 3053 * (nicm) Linux port.
 3054 
 3055 30 October 2007
 3056 
 3057 * (nicm) swap-window command. Same as link-window but swaps windows.
 3058 
 3059 26 October 2007
 3060 
 3061 * (nicm) Saving scroll region on \e7 causes problems with ncmpc so I guess
 3062   it is not required.
 3063 * (nicm) unlink-window command.
 3064 * (nicm) link-window command to link an existing window into another session
 3065   (or another index in the same session). Syntax:
 3066 
 3067 	tmux -s dstname link-window [-i dstidx] srcname srcidx
 3068 
 3069 * (nicm) Redo window data structures. The global array remains, but each per-
 3070   session list is now a RB tree of winlink structures. This disassociates the
 3071   window index from the array size (allowing arbitrary indexes) which still
 3072   allowing windows to have multiple indexes.
 3073 
 3074 25 October 2007
 3075 
 3076 * (nicm) has-session command: checks if session exists.
 3077 
 3078 24 October 2007
 3079 
 3080 * (nicm) Support for \e6n to request cursor position. resize(1) now works.
 3081 * (nicm) Support for \e7, \e8 save/restore cursor and attribute sequences.
 3082   Currently don't save mode (probably should). Also change some cases where
 3083   out-of-bound values are ignored to limit them to within range (there are
 3084   others than need to be checked too).
 3085 
 3086 23 October 2007
 3087 
 3088 * (nicm) Lift limit on session name passed with -s.
 3089 * (nicm) Show size in session/window lists.
 3090 * (nicm) Pass tty up to server when client identifies and add a list-clients
 3091   command to list connected clients.
 3092 
 3093 20 October 2007
 3094 
 3095 * (nicm) Add default-command option and change default to be $SHELL rather than
 3096   $SHELL -l. Also try to read shell from passwd db if $SHELL isn't present.
 3097 
 3098 19 October 2007
 3099 
 3100 * (nicm) -n on new-session is now -s, and -n is now the initial window name.
 3101   This was documented but not implemented :-/.
 3102 * (nicm) kill-window command, bound to & by default (because it should be hard
 3103   to hit accidently).
 3104 * (nicm) bell-style option with three choices: "none" completely ignore bell;
 3105   "any" pass through a bell in any window to current; "current" ignore bells
 3106   except in current window. This applies only to the bell terminal signal,
 3107   the status bar always reflects any bells.
 3108 * (nicm) Refresh session command.
 3109 
 3110 12 October 2007
 3111 
 3112 * (nicm) Add a warning if $TMUX exists on new/attach.
 3113 * (nicm) send-prefix command. Bound to C-b by default.
 3114 * (nicm) set status, status-fg, status-bg commands. fg and bg are as a number
 3115   from 0 to 8 or a string ("red", "blue", etc). status may be 1/0, on/off,
 3116   yes/no.
 3117 * (nicm) Make status line mark window in yellow on bell.
 3118 
 3119 04 October 2007
 3120 
 3121 * (nicm) -d option to attach to detach all other clients on the same session.
 3122 * (nicm) Partial resizing support. Still buggy. A C-b S and back sometimes fixes
 3123   it when it goes wonky.
 3124 * (mxey) Added my tmux start script as an example (examples/start-tmux.sh).
 3125 * (mxey) New sessions can now be given a command for their first window.
 3126 * (mxey) Fixed usage statement for new-window.
 3127 * (nicm) attach-session (can't believe I forgot it until now!) and list-windows
 3128   commands.
 3129 * (nicm) rename-window and select-window commands.
 3130 * (nicm) set-option command (alias set): "tmux set-option prefix ^A".
 3131 * (nicm) Key binding and unbinding is back.
 3132 
 3133 03 October 2007
 3134 
 3135 * (nicm) {new,next,last,previous}-window.
 3136 * (nicm) Rewrite command handling so commands are much more generic and the
 3137   same commands are used for command line and keys (although most will probably
 3138   need to check how they are called). Currently incomplete (only new/detach/ls
 3139   implemented). Change: -s is now passed before command again!
 3140 * (nicm) String number arguments. So you can do: tmux bind ^Q create "blah".
 3141 * (nicm) Key binding. tmux bind key command [argument] and tmux unbind key.
 3142   Key names are in a table in key-string.c, plus A is A, ^A is ctrl-A.
 3143   Possible commands are in cmd.c (look at cmd_bind_table).
 3144 * (nicm) Move command parsing into the client. Also rename some messages and
 3145   tidy up a few bits. Lots more tidying up needed :-/.
 3146 
 3147 02 October 2007
 3148 
 3149 * (nicm) Redraw client status lines on rename.
 3150 * (nicm) Error on ambiguous command.
 3151 
 3152 01 October 2007
 3153 
 3154 * (nicm) Restore window title handling.
 3155 * (nicm) Simple uncustomisable status line with window list.
 3156 
 3157 30 September 2007
 3158 
 3159 * (nicm) Window info command for debugging, C-b I.
 3160 
 3161 29 September 2007
 3162 
 3163 * (nicm) Deleting/inserting lines should follow scrolling region. Fix.
 3164 * (nicm) Allow creation of detached sessions: "tmux new-session -d".
 3165 * (nicm) Permit error messages to be passed back for transient clients like
 3166   rename. Also make rename -i work.
 3167 * (nicm) Pass through bell in any window to current.
 3168 
 3169 28 September 2007
 3170 
 3171 * (nicm) Major rewrite of input parser:
 3172 	- Lose the old weirdness in favour of a state machine.
 3173 	- Merge in parsing from screen.c.
 3174 	- Split key parsing off into a separate file.
 3175   This is step one towards hopefully allowing a status line. It requires
 3176   that we output data as if the terminal had one line less than it really does -
 3177   a serious problem when it comes to things like scrolling. This change
 3178   consolidates all the range checking and limiting together which should make
 3179   it easier.
 3180 * (mxey) Added window renaming, like "tmux rename [-s session] [-i index] name"
 3181 
 3182 27 September 2007
 3183 
 3184 * Split "tmux list" into "tmux list-sessions" (ls) and "list-windows" (lsw).
 3185 * New command session selection:
 3186 	- if name is specified, look for it and use it if it exists, otherwise
 3187 	  error
 3188 	- if no name specified, try the current session from $TMUX
 3189 	- if $TMUX doesn't exist, and there is only one session, use it,
 3190 	  otherwise error
 3191 
 3192 26 September 2007
 3193 
 3194 * Add command aliases, so "ls" is an alias for "list".
 3195 * Rename some commands and alter syntax to take options after a la CVS. Also
 3196   change some flags. So:
 3197 
 3198 	tmux -s/socket -nabc new
 3199 
 3200   Becomes:
 3201 
 3202 	tmux -S/socket new -sabc
 3203 
 3204 * Major tidy and split of client/server code.
 3205 
 3206 22 September 2007
 3207 
 3208 * Window list command (C-b W). Started by Maximilian Gass, finished by me.
 3209 
 3210 20 September 2007
 3211 
 3212 * Specify meta via environment variable (META).
 3213 * Record last window and ^L key to switch to it. Largely from Maximilian Gass.
 3214 * Reset ignored signals in child after forkpty, makes ^C work.
 3215 * Wrap on next/previous. From Maximilian Gass.
 3216 
 3217 19 September 2007
 3218 
 3219 * Don't renumber windows on close.
 3220 
 3221 28 August 2007
 3222 
 3223 * Scrolling region (\e[r) support.
 3224 
 3225 27 August 2007
 3226 
 3227 * Change screen.c to work more logically and hopefully fix heap corruption.
 3228 
 3229 09 July 2007
 3230 
 3231 * Initial import to CVS. Basic functions are working, albeit with a couple of
 3232   showstopper memory bugs and many missing features. Detaching, reattaching,
 3233   creating new sessions, listing sessions work acceptably for using with shells.
 3234   Simple curses programs (top, systat, tetris) and more complicated ones (mutt,
 3235   emacs) that don't require scrolling regions (ESC[r) mostly work fine
 3236   (including mutt, emacs). No status bar yet and no key remapping or other
 3237   customisation.