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1 Emacs TODO List -*-outline-*-
3 Copyright (C) 2001-2018 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
7 If you are ready to start working on any of these TODO items, we
8 appreciate your help; please write to firstname.lastname@example.org so we can be
9 aware that the problem is being addressed, and talk with you how to do
10 it best. Also to check that it hasn't been done already, since we
11 don't always remember to update this file! It is best to consult
12 the latest version of this file in the Emacs source code repository.
14 Since Emacs is an FSF-copyrighted package, please be prepared to sign
15 legal papers to transfer the copyright on your work to the FSF.
16 Copyright assignment is a simple process. Residents of some countries
17 can do it entirely electronically. We can help you get started, and
18 answer any questions you may have (or point you to the people with the
19 answers), at the email@example.com mailing list.
21 For more information about getting involved, see the CONTRIBUTE file.
23 As well as the issues listed here, there are bug reports at
24 <https://debbugs.gnu.org>. Bugs tagged "easy" ought to be suitable for
25 beginners to work on, but unfortunately we are not very good at using
26 this tag. Bugs tagged "help" are ones where assistance is required,
27 but may be difficult to fix. Bugs with severity "important" or higher
28 are the ones we consider more important, but these also may be
29 difficult to fix. Bugs with severity "minor" may be simpler, but this
30 is not always true.
32 * Speed up Elisp execution
33 ** Speed up function calls
34 Change src/bytecode.c so that calls from byte-code functions to byte-code
35 functions don't go through Ffuncall/funcall_lambda/exec_byte_code but instead
36 stay within exec_byte_code.
38 ** Improve the byte-compiler to recognize immutable (lexical) bindings
39 and get rid of them if they're used only once and/or they're bound to
40 a constant expression.
42 Such things aren't present in hand-written code, but macro expansion and
43 defsubst can often end up generating things like
44 (funcall (lambda (arg) (body)) actual) which then get optimized to
45 (let ((arg actual)) (body)) but should additionally get optimized further
46 when 'actual' is a constant/copyable expression.
48 ** Add an "indirect goto" byte-code and use it for local lambda expressions.
49 E.g. when you have code like
51 (let ((foo (lambda (x) bar)))
53 (funcall foo toto)
54 (blabla (funcall foo titi))))
56 turn those 'funcalls' into jumps and their return into indirect jumps back.
58 ** Compile efficiently local recursive functions
60 Similar to the previous point, we should be able to handle something like
62 (letrec ((loop () (blabla) (if (toto) (loop))))
65 which ideally should generate the same byte-code as
67 (while (progn (blabla) (toto)))
69 * Things that were planned for Emacs-24
71 ** concurrency: including it as an "experimental" compile-time option
72 sounds good. Of course there might still be big questions around "which form
73 of concurrency" we'll want.
74 ** better support for dynamic embedded graphics: I like this idea (my
75 mpc.el code could use it for the volume widget), though I wonder if the
76 resulting efficiency will be sufficient.
77 ** Spread Semantic.
78 ** Improve the "code snippets" support: consolidate skeleton.el, tempo.el,
79 and expand.el (any other?) and then advertise/use/improve it.
80 ** Improve VC: yes, there's a lot of work to be done there :-(
82 ** Random things that cross my mind right now that I'd like to see (some of
83 them from my local hacks), but it's not obvious at all whether they'll
84 make it.
85 *** prog-mode could/should provide a better fill-paragraph default
86 that uses syntax-tables to recognize string/comment boundaries.
87 *** provide more completion-at-point-functions. Make existing
88 in-buffer completion use completion-at-point.
89 *** "functional" function-key-map that would make it easy to add (and
90 remove) mappings like "FOO-mouse-4 -> FOO-scroll-down",
91 "FOO-tab -> ?\FOO-\t", "uppercase -> lowercase", "[fringe KEY...] ->
92 [KEY]", "H-FOO -> M-FOO", "C-x C-y FOO -> H-FOO", ...
94 * Things related to elpa.gnu.org.
96 ** Move idlwave to elpa.gnu.org.
97 Need to sync up the Emacs and external versions.
98 See <https://lists.gnu.org/r/emacs-devel/2014-07/msg00008.html>
100 ** Move Org mode to elpa.gnu.org.
101 See <https://lists.gnu.org/r/emacs-devel/2014-08/msg00300.html>
104 ** Move verilog-mode to elpa.gnu.org.
105 See <https://lists.gnu.org/r/emacs-devel/2015-02/msg01180.html>
107 ** Move vhdl-mode to elpa.gnu.org.
108 See <https://lists.gnu.org/r/emacs-devel/2015-02/msg01180.html>
110 * Simple tasks. These don't require much Emacs knowledge, they are
111 suitable for anyone from beginners to experts.
113 ** Convert modes that use view-mode to be derived from special-mode instead.
115 ** Major modes should have a menu entry.
117 ** Check if all items on the mode-line have a suitable tooltip for all modes.
119 ** edebug and debugger-mode should have a toolbar.
120 It can use the same icons as gud.
122 ** Check what minor modes don't use define-minor-mode and convert them
123 to use it.
125 ** Convert all defvars with leading '*' in the doc-strings into defcustoms
126 of appropriate :type and :group.
128 ** Remove any leading '*'s from defcustom doc-strings.
129 [done?] [A lot of them are in CC Mode.]
131 ** Remove unnecessary autoload cookies from defcustoms.
132 This needs a bit of care, since often people have become used to
133 expecting such variables to always be defined, eg when they modify
134 things in their .emacs.
136 ** See if other files can use generated-autoload-file (see eg ps-print).
138 ** Write more tests. Pick a fixed bug from the database, write a test
139 case to make sure it stays fixed. Or pick your favorite programming
140 major-mode, and write a test for its indentation. Or a version
141 control backend, and write a test for its status parser. Etc.
142 See the 'test' directory for examples.
144 * Small but important fixes needed in existing features:
146 ** Flymake's customization mechanism needs to be both simpler (fewer
147 levels of indirection) and better documented, so it is easier to
148 understand. I find it quite hard to figure out what compilation
149 command it will use.
151 I suggest totally rewriting that part of Flymake, using the simplest
152 mechanism that suffices for the specific needs. That will be easy
153 for users to customize.
155 ** Distribute a bar cursor of width > 1 evenly between the two glyphs
156 on each side of the bar (what to do at the edges?).
158 ** revert-buffer should eliminate overlays and the mark.
159 For related problems consult the thread starting with
162 ** erase-buffer should perhaps disregard read-only properties of text.
164 ** Fix the kill/yank treatment of invisible text. At the moment,
165 invisible text is placed in the kill-ring, so that the contents of
166 the ring may not correspond to the text as displayed to the user.
167 It ought to be possible to omit text which is invisible (due to a
168 text-property, overlay, or selective display) from the kill-ring.
170 ** Feature to change cursor shape when Emacs is idle (for more than
171 a specified time).
173 ** The buttons at the top of a custom buffer should not omit
174 variables whose values are currently hidden.
176 ** Clean up the variables in browse-url. Perhaps use a shell command string to
177 specify the browser instead of the mushrooming set of functions.
178 See also ESR's proposal for a BROWSER environment variable
181 ** Enhance scroll-bar to handle tall line (similar to line-move).
183 ** In Custom buffers, put the option that turns a mode on or off first,
184 using a heuristic of some kind?
186 ** Define recompute-arg and recompute-arg-if for fix_command to use.
187 See rms message of 11 Dec 05 in
189 and the rest of that discussion.
191 ** In Emacs Info, examples of using Customize should be clickable
192 and they should create Custom buffers.
194 ** The toolbar should show keyboard equivalents in its tooltips.
196 ** Add function to redraw the tool bar.
198 ** Redesign the load-history data structure so it can cope better
199 with evaluating definitions of the same function from different files,
200 recording which file the latest definition came from.
202 ** make back_comment use syntax-ppss or equivalent.
204 ** Consider improving src/sysdep.c's search for a fqdn.
207 ** Find a proper fix for rcirc multiline nick adding.
210 ** Check for any included packages that define obsolete bug-reporting commands.
211 Change them to use report-emacs-bug.
212 *** Related functions:
213 **** gnus-bug
214 **** report-calc-bug
215 **** org-submit-bug-report
216 **** lm-report-bug
217 **** tramp-bug
218 **** c-submit-bug-report
219 [Do all of them need changing?]
221 ** Allow fringe indicators to display a tooltip (provide a help-echo property?)
223 ** Add a defcustom that supplies a function to name numeric backup files,
224 like make-backup-file-name-function for non-numeric backup files.
226 ** 'dired-mode' should specify the semantics of 'buffer-modified-p' for
227 dired buffers and DTRT WRT 'auto-revert-mode'.
229 ** Check uses of prin1 for error-handling.
232 * Important features:
234 ** "Emacs as word processor"
236 rms writes:
237 25 years ago I hoped we would extend Emacs to do WYSIWYG word
238 processing. That is why we added text properties and variable
239 width fonts. However, more features are still needed to achieve this.
241 ** Extend text-properties and overlays
242 *** Several text-property planes
243 This would get us rid of font-lock-face property (and I'd be happy to
244 get rid of char-property-alias-alist as well) since font-lock would
245 simply use the 'face' property in the 'font-lock' plane.
247 Basically 'put-text-property' and friends would take an extra argument PLANE
248 (maybe the best backward-compatible way to do that is to make it so that
249 PROPERTY can be a cons cell (PLANE . PROP)). So font-lock would
250 do (put-text-property start end '(font-lock . face) value).
252 All the properties coming from the various planes would get merged via an Elisp
253 function (so it can merge 'face' differently than 'keymap' or it could give
254 different priorities to different planes (we could imagine enabling/disabling
255 planes)). The merging would not happen lazily while looking up properties but
256 instead it would take place eagerly in 'add-text-properties'. This is based on
257 the idea that it's much more frequent to lookup properties than to
258 modify them. Also, when properties are looked up during redisplay, we
259 generally can't run Elisp code, whereas we generally can do that when
260 properties are added.
262 *** Move overlays to intervals.c
264 Currently overlays are implemented as (two) sorted singly linked lists (one
265 for overlays_before some position and one for overlay_after that
266 position, for some quirky definition of "before" and "after").
267 The function 'overlay-recenter' changes the position used for the split
268 (and is called internally in various situations).
270 Each overlay is itself implemented with two markers (which keep track of
271 the overlay-start and overlay-end). Markers are implemented as
272 a non-sorted singly linked list of markers. So every text
273 insertion/deletion requires O(N) time, where N is the number of markers
274 since we have to go down that list to update those markers that are
275 affected by the modification.
277 You can start in src/buffer.[ch], maybe grepping for overlays_before for
278 a starting point.
280 Text-properties, OTOH, are implemented with a (mostly) balanced binary
281 tree. This is implemented in src/intervals.[ch].
283 So we'd like to change overlays so that they don't use markers (and we
284 don't keep them in two sorted singly-linked lists) any more. Instead,
285 we'll store them inside the balanced binary tree used for
286 text-properties. I think we can use the "augmented tree" approach
287 described in https://en.wikipedia.org/wiki/Interval_tree.
289 To ease up debugging during development, I'd guess the implementation
290 would first add the new stuff, keeping the old stuff (i.e. add to
291 Lisp_Overlay whichever fields are needed for the new code, while keeping
292 the old ones, add needed overlay fields to the intervals tree, but keep
293 the old fields, the overlays_before etc...). This way, you can add
294 consistency checks that make sure the new code computes the same results
295 as the old code. And once that works well, we can remove the old code
296 and old fields.
298 ** Having tabs above a window to switch buffers in it.
300 ** "Perspectives" are named persistent window configurations. We have
301 had the window configuration mechanism in GNU Emacs since the
302 beginning but we have never developed a good user interface to take
303 advantage of them. Eclipse's user interface seems to be good.
305 Perspectives work well even if you do the equivalent of C-x 4 C-f
306 because of the distinction between view windows vs file windows. In
307 Emacs this is more or less the "dedicated window" feature, but we have
308 never really made it work for this.
310 Perspectives also need to interact with the tabs.
312 ** FFI (foreign function interface)
313 See eg https://lists.gnu.org/r/emacs-devel/2013-10/msg00246.html
315 One way of doing this is to start with fx's dynamic loading, and use it
316 to implement things like auto-loaded buffer parsers and database
317 access in cases which need more than Lisp.
319 ** Replace unexec with a more portable form of dumping
320 See eg https://lists.gnu.org/r/emacs-devel/2014-01/msg01034.html
323 One way is to provide portable undumping using mmap (per gerd design).
325 ** Imenu could be extended into a file-structure browsing mechanism
326 using code like that of customize-groups.
328 ** Display something in the margin on lines that have compilation errors.
330 ** Compilation error navigation bar, parallel to the scroll bar,
331 indicating where in the buffer there are compilation errors.
332 Perhaps we could arrange to display these error indications on top
333 of the scroll bar itself. That depends on to what extent toolkit
334 scroll bars are extensible.
336 ** Provide user-friendly ways to list all available font families,
337 list fonts, display a font as a sample, etc. [fx is looking at
338 multilingual font selection for the Unicode branch of Emacs.]
340 ** Provide a convenient way to select a color with the mouse.
342 ** Rewrite the face code to be simpler, clearer and faster.
344 ** Program Enriched mode to read and save in RTF. [Is there actually a
345 decent single definition of RTF? Maybe see info at
346 http://latex2rtf.sourceforge.net/.] This task seems to be addressed
347 by https://savannah.nongnu.org/projects/emacs-rtf/, which is still in
348 very early stages.
350 Another place to look is the Wikipedia article at
353 It currently points to the latest spec of RTF v1.9.1 at
356 ** Implement primitive and higher-level functions to allow filling
357 properly with variable-pitch faces.
359 ** Implement intelligent search/replace, going beyond query-replace
360 (see http://groups.csail.mit.edu/uid/projects/clustering/chi04.pdf).
362 ** Implement other text formatting properties.
363 *** Footnotes that can appear either in place or at the end of the page.
364 *** text property that says "don't break line in middle of this".
365 Don't break the line between two characters that have the
366 same value of this property.
367 *** Discretionary hyphens that are not visible when they are at end of line.
369 ** Internationalize Emacs's messages.
371 ** Set up a facility to save backtraces when errors happen during
372 specified filters, specified timers, and specified hooks.
374 ** Install firstname.lastname@example.org's no-flicker change.
376 ** Add a "current vertical pixel level" value that goes with point,
377 so that motion commands can also move through tall images.
378 This value would be to point as window-vscroll is to window-start.
380 ** Address internationalization of symbols names essentially
381 as documentation, e.g. in command names and Custom.
383 ** Make the Lucid menu widget display multilingual text. [This
384 probably needs to be done from actual Emacs buffers, either directly
385 in the menu or by rendering in an unmapped window and copying the
386 pixels. The current code assumes a specific locale; that isn't good
387 enough even if X can render the arbitrary text] [The gtk
388 port now displays multilingual text in menus, but only insofar as
389 Emacs can encode it as utf-8 and gtk can display the result.]
390 Maybe making Lucid menus work like Gtk's (i.e. just force utf-8) is good
391 enough now that Emacs can encode most chars into utf-8.
393 ** The GNUstep port needs some serious attention, ideally from someone
394 familiar with GNUstep and Objective C.
396 * Other features we would like:
398 ** A more modern printing interface. One that pops up a dialog that lets
399 you choose printer, page style, etc.
400 Integration with the Gtk print dialog is apparently difficult. See eg:
404 ** Allow frames(terminals) created by emacsclient to inherit their environment
405 from the emacsclient process.
407 ** Give Tar mode all the features of Archive mode.
409 ** Create a category of errors called 'process-error'
410 for some or all errors associated with using subprocesses.
412 ** Maybe reinterpret 'parse-error' as a category of errors
413 and put some other errors under it.
415 ** Make byte-compile warn when a doc string is too wide.
417 ** Make byte-optimization warnings issue accurate line numbers.
419 ** Record the sxhash of the default value for customized variables
420 and notify the user (maybe by adding a menu item or toolbar button,
421 as the detection can occur during autoload time) when the default
422 changes (meaning that new versions of the Lisp source with a changed
423 default value got installed) and offer ediff on the respective
424 customization buffers.
426 ** Emacs Lisp mode could put an overlay on the defun for every
427 function that has advice. The overlay could have 'after-text' like
428 " [Function has advice]". It might look like (defun foo [Function
429 has advice] (x y) The overlay could also be a button that you could
430 use to view the advice.
432 ** Add a function to get the insertion-type of the markers in an overlay.
434 ** ange-ftp
435 *** understand sftp
436 This is hard to make work because sftp doesn't print status messages.
438 *** Use MLS for ange-ftp-insert-directory if a list of files is specified.
440 ** Ability to map a key, including all modified-combinations.
441 E.g map mouse-4 to wheel-up as well as M-mouse-4 -> M-wheel-up
442 M-C-mouse-4 -> M-C-wheel-up, H-S-C-M-s-double-mouse-4 ->
443 H-S-C-M-s-double-wheel-up, ...
445 ** Beefed-up syntax-tables.
446 *** recognize multi-character syntactic entities like 'begin' and 'end'.
447 *** nested string-delimiters (for PostScript's (foo(bar)baz) strings).
448 *** support for infix operators (with precedence).
449 *** support for the $ (paired delimiter) in parse-partial-sexp.
450 *** support for hook-chars whose effect on the parsing-state is specified
451 by elisp code. Thus a char could both close a string and open a comment
452 at the same time and do it in a context-sensitive way.
453 *** ability to add mode-specific data to the partial-parse-state.
455 ** Add a way to convert a keyboard macro to equivalent Lisp code.
457 ** Have a command suggestion help system that recognizes patterns
458 of commands which could be replaced with a simpler common command.
459 It should not make more than one suggestion per 10 minutes.
461 ** Add a way to define input methods by computing them (when first used)
462 from other input methods. Then redefine C-x 8 to use a
463 user-selected input method, with the default being the union of
464 latin-1-prefix and latin-1-postfix.
466 ** Implement a clean way to use different major modes for
467 different parts of a buffer. This could be useful in editing
468 Bison input files, for instance, or other kinds of text
469 where one language is embedded in another language. See
470 http://www.loveshack.ukfsn.org/emacs/multi-mode.el and also
471 mmm-mode, as reference for approaches taken by others.
473 ** Arrange a way for an input method to return the first character
474 immediately, then replace it later. So that C-s a with
475 input method latin-1-postfix would immediately search for an a.
477 ** Give start-process the ability to direct standard-error
478 output to a different filter.
480 ** Give desktop.el a feature to switch between different named desktops.
482 ** Add a cpio mode, more or less like tar mode.
484 ** Save undo information in special temporary files, and reload it
485 when needed for undoing. This could extend undo capacity.
486 undo-tree, in ELPA, already does this; its saving code could be
487 integrated without requiring the use of undo-tree.
489 ** Change the Windows NT menu code
490 so that it handles the deep_p argument and avoids
491 regenerating the whole menu bar menu tree except
492 when the user tries to use the menubar.
494 This requires the RIT to forward the WM_INITMENU message to
495 the main thread, and not return from that message until the main
496 thread has processed the MENU_BAR_ACTIVATE_EVENT and regenerated
497 the whole menu bar. In the mean time, it should process other messages.
499 ** Get some major packages installed: W3 (development version needs
500 significant work), PSGML, _possibly_ ECB.
502 Check the assignments file for other packages which might go in and
503 have been missed.
505 ** Make compiler warnings about functions that might be undefined at run time
506 smarter, so that they know which files are required by the file being
507 compiled and don't warn about functions defined in them.
509 ** Split out parts of lisp.h.
511 ** Update the FAQ.
513 ** Allow auto-compression-mode to use zlib calls if zlib is available.
514 [It's required for PNG, so may be linked anyhow.]
516 ** Improve the GC (generational, incremental). (We may be able to use
517 the Boehm collector.) [See the Boehm-GC branch in CVS for work on this.]
519 ** Check what hooks would help Emacspeak -- see the defadvising in W3.
521 ** Add definitions for symbol properties, for documentation purposes.
523 ** Temporarily remove scroll bars when they are not needed, typically
524 when a buffer can be fully displayed in its window.
526 ** Provide an optional feature which computes a scroll bar slider's
527 size and its position from lines instead of characters.
529 ** Allow unknown image types to be rendered via an external program
530 converting them to, say, PBM (in the same way as PostScript?). [does
531 doc-view.el do this, or could it be extended to do this?
532 Does ImageMagick obsolete this idea?]
534 ** Allow displaying an X window from an external program in a buffer,
535 e.g. to render graphics from Java applets. [gerd and/or wmperry
536 thought this was feasible.]
538 ** Allow images (not just text) in the margin to be mouse-sensitive.
539 (Requires recursing through display properties). Provide some way
540 to simulate mouse-clicks on marginal text without a mouse.
542 ** Extend ps-print to deal with multiple font sizes, images, and extra
545 ** Use the XIE X extension, if available, for image display.
547 ** Make monochrome images display using the foreground and background
548 colors of the applicable faces.
550 ** Make 'format-time-string' preserve text properties like 'format'.
552 ** Optionally make the cursor a little thinner at the end of a line
553 or the end of the buffer.
555 ** Port the conservative stack marking code of Emacs's garbage collector
556 to more systems, so that we can completely get rid of GCPROs. Note
557 that Boehm garbage collector provides this.
559 ** Reorder defcustom's in each package so that the more important
560 options come first in the Customize buffers. This could be done by
561 either rearranging the file (since options are shown in the order
562 they appear in the *.el files), or by adding a few :set-after attributes.
564 ** Maybe document the features of libraries missing from the manual (or
565 ancillary manuals, including the Lisp manual in some cases).
566 This is not worth doing for all of these packages and we need not
567 aim for completeness, but some may be worth documenting.
569 Here's a list which is probably not complete/correct: align, allout,
570 artist, ansi-color, array, calculator, cdl, cmuscheme,
571 completion, delim-col, dirtrack, double, echistory, elide-head,
572 easymenu, expand, flow-ctrl, format [format-alist],
573 generic/generic-x [various modes], kermit, log-edit,
574 makesum, midnight [other than in Kill Buffer node],
575 mouse-copy [?], mouse-drag, mouse-sel, net-utils, rcompile,
576 snmp-mode [?], soundex [should be interactive?], strokes [start from
577 the web page], talk, thingatpt [interactive functions?], type-break,
578 vcursor, xscheme, zone-mode [?], mlconvert [?], iso-cvt,
579 feedmail [?], uce, gametree, page-ext,
580 refbib, refer, scribe, texinfo, underline,
581 cmacexp, hideif, mantemp [obsolete?], pcomplete, xml,
582 cvs-status (should be described in PCL-CVS manual); other progmodes,
583 probably in separate manual.
585 ** Convert the XPM bitmaps to PPM, replace the PBMs with them and scrap
586 the XPMs so that the color versions work generally. (Requires care
587 with the color used for the transparent regions.)
589 ** Convenient access to the 'values' variable. It would be nice to have an
590 interface that would show you the printed reps of the elements of the
591 list in a menu, let you select one of the values, and put it into some
592 other variable, without changing the value of 'values'.
594 ** (Controlled by a flag) make open and close syntax match exactly,
595 i.e. '(' doesn't match ']'.
597 ** Specify parameter ID-FORMAT in all calls to 'file-attributes' and
598 'directory-files-and-attributes' where attributes UID or GID are used.
599 Whenever possible, use value 'string.
600 When done, change meaning of default value from 'integer to 'string.
601 If value 'integer is used nowhere, remove the parameter ID-FORMAT from
602 the definition of 'file-attributes' and 'directory-files-and-attributes'
603 and from the calls.
605 ** Make language-info-alist customizable. Currently a user can customize
606 only the variable 'current-language-environment'.
608 ** Improve language environment handling so that Emacs can fit
609 better to a users locale. Currently Emacs uses utf-8 language
610 environment for all utf-8 locales, thus a user in ja_JP.UTF-8 locale
611 are also put in utf-8 lang. env. In such a case, it is
612 better to use Japanese lang. env. but prefer utf-8 coding system.
614 ** Enhance locale handling: handle language, territory and charset
615 orthogonally and de-emphasize language environments. Use the locale
616 to set up more things, such as fontsets, the default Ispell
617 dictionary, diary format, calendar holidays and display, quoting
618 characters and phrase boundaries, sentence endings, collation for
619 sorting (at least for unicodes), HTTP Accept-language, patterns for
620 directory listings and compilation messages, yes-or-no replies,
621 common menu items when the toolkit supports it ... 'locale-info'
622 needs extending for LC_COLLATE &c. [fx started on this.]
624 ** Eliminate the current restriction on header printing by ps-print.
625 Currently, a header can contain only single 1-byte charset in
626 addition to ASCII.
628 ** In ps-print, provide an user friendly interface to specify fonts.
630 ** Enhance word boundary detection for such a script that doesn't use
631 space at word boundary (e.g. Thai).
633 ** Implement interface programs with major Japanese conversion server
634 in lib-src so that they can be used from the input method
635 "japanese". Currently, most Japanese users are using external
636 packages (e.g. tamago, anthy) or an input method via XIM.
638 ** Let LEIM handle the Mode_switch key like XIM does (i.e. a toggle like C-\
639 but which can also be used as a modifier).
641 ** Improve Help buffers: Change the face of previously visited links (like
642 Info, but also with regard to namespace), and give the value of
643 lisp expressions, e.g auto-mode-alist, the right face.
645 ** Possibly make 'list-holidays' eval items in the calendar-holidays variable.
646 See thread
648 [email@example.com will look at this after 22.1]
650 ** Possibly make cal-dst use the system timezone database directly.
651 See thread
654 ** Possibly add a "close" button to the modeline.
655 The idea is to add an "X" of some kind, that when clicked deletes
656 the window associated with that modeline.
659 * Things to be done for specific packages or features
661 ** NeXTstep port
663 *** Missing features
665 This sections contains features found in other official Emacs ports.
667 **** Support for xwidgets
669 Emacs 25 has support for xwidgets, a system to include operating
670 system components into an Emacs buffer. The components range from
671 simple buttons to webkit (effectively, a web browser).
673 Currently, xwidgets works only for the gtk+ framework but it is
674 designed to be compatible with multiple Emacs ports.
676 **** Respect 'frame-inhibit-implied-resize'
678 When the variable 'frame-inhibit-implied-resize' is non-nil, frames
679 should not be resized when operations like changing font or toggling
680 the tool bar is performed.
682 Unfortunately, the tool bar (and possible other operations) always
683 resize the frame.
685 **** Support 'proced' (implement 'process-attributes')
687 Unfortunately, a user-level process like Emacs does not have the
688 privileges to get information about other processes under macOS.
690 There are other ways to do this:
692 1) Spawn "ps" and parse the output ("ps" has superuser privileges).
694 2) Sign Emacs as part of the distribution process.
696 3) Ask the user to self-sign Emacs, if this feature is of interest.
698 Anders Lindgren <firstname.lastname@example.org> has implemented
699 'process-attributes' for macOS, which currently only work when
700 running Emacs as root.
702 See this article by Bozhidar Batsov for an overview of Proced:
705 **** Tooltip properties
707 Tooltip properties like the background color and font are hard-wired,
708 even though Emacs allows a user to customize such features.
710 *** New features
712 This section contains features unique to Nextstep and/or macOS.
714 **** PressAndHold for writing accented character
716 On macOS, many application support the press and hold pattern to
717 invoke a menu of accented characters. (See example at
718 https://support.apple.com/en-us/HT201586 .)
720 Currently, this doesn't work in Emacs.
722 Note that "ns-win.el" explicitly disables this.
724 Note: This feature might not be allowed to be implemented until also
725 implemented in Emacs for a free system.
727 **** Floating scroll bars
729 In modern macOS applications, the scroll bar often floats over the
730 content, and is invisible unless actually used. This makes the user
731 interface less cluttered and more area could be used to contain text.
733 With floating scroll bars, the user interface would look like it does
734 when they are disabled today. However, they will be made visible when
735 a scroll action is initiated, e.g. by putting two fingers on a
738 Note: This feature might not be allowed to be implemented until also
739 implemented in Emacs for a free system.
741 *** Features from the "mac" port
743 This section contains features available in the "mac" Emacs port.
745 As the "mac" port (as of this writing) isn't an official Emacs port,
746 it might contain features not following the FSF rule "must exist on
747 free systems".
749 The "mac" port is based on the Emacs 22 C-based Carbon interface.
750 It has been maintained in parallel to the official Cocoa-based NS
751 interface. The Carbon interface has been enhanced, and a number of the
752 features of that interface could be implemented NS.
754 **** Smooth scrolling -- maybe not a good idea
756 Today, by default, scrolling with a trackpad makes the text move in
757 steps of five lines. (Scrolling with SHIFT scrolls one line at a time.)
759 The "mac" port provides smooth, pixel-based, scrolling. This is a very
760 popular features. However, there are drawbacks to this method: what
761 happens if only a fraction of a line is visible at the top of a
762 window, is the partially visible text considered part of the window or
763 not? (Technically, what should 'window-start' return.)
765 An alternative would be to make one-line scrolling the default on NS
766 (or in Emacs in general).
768 Note: This feature might not be allowed to be implemented until also
769 implemented in Emacs for a free system.
771 **** Mouse gestures
773 The "mac" port defines the gestures 'swipe-left/right/up/down',
774 'magnify-up/down', and 'rotate-left/right'.
776 It also binds the magnification commands to change the font
777 size. (This should be not be done in a specific interface, instead
778 Emacs should do this binding globally.)
780 Note: This feature might not be allowed to be implemented until also
781 implemented in Emacs for a free system.
783 **** Synthesize bold fonts
785 *** Open issues
787 This section contains issues where there is an ongoing debate.
789 **** Key bindings of CMD and ALT
791 Currently in the "ns" port, ALT is bound to Meta and CMD is bound to
792 Super -- allowing the user to use typical macOS commands like CMD-A to
793 mark everything.
795 Unfortunately, when using an international keyboard, you can't type
796 normal characters like "(" etc.
798 There are many alternative key bindings. One solution is to bind CMD
799 to Meta and pass ALT to the system. In fact, this is what Emacs did up
800 to, and including, version 22. Also, this is how the "mac" port binds
801 the keys.
803 One could envision asymmetrical variants as well, however, this is
804 inappropriate for the default setting.
806 See the discussion on emacs-devel:
810 *** Internal development features
812 **** Regression test system (or at least a checklist)
814 Today, after each change to the user interface, Emacs must be manually
815 tested. Often, small details are overlooked ("Oh, I didn't test
816 toggling the tool-bar in one of the full screen modes, when multiple
817 frame were open -- silly me.")
819 It would be an enormous help if this could be tested automatically.
820 Many features are generic, however, the NS interface provides a number
821 of unique features.
823 **** Existing packages
825 Note that there is a generic UI test named frame-test.el, see
826 https://debbugs.gnu.org/21415#284 .
827 The NS interface passes this, with the exception of two toolbar-related errors.
829 **** Anders frame test
831 Anders Lindgren <email@example.com> has implemented some (very basic)
832 tests for full screen, toolbar, and auto-hiding the menu bar.
834 **** Make sure all build variants work
836 Emacs can be build in a number of different ways. For each feature,
837 consider if is really is "NS" specific, or if it should be applied to
838 all build versions.
840 - With the "NS" interface. This is the normal way to build Emacs on
843 - With the "X11" interface. On macOS, this is mainly of interest to
844 developers of Emacs to get a "reference" interface implementations.
845 However, it might be of interest for people working remotely, as X11
846 applications can be used over a network connection.
848 - Console only.
850 *** Bugs
852 **** Incorrect translation of Super modifier with Ctrl or Meta on macOS
854 When pressing 'M-s-a', Emacs replies "M-s-å is undefined". What
855 happened is a mix of Emacs view that Meta and Super has been pressed,
856 and macOS view that ALT-a should yield "å" (U+00E5 LATIN SMALL LETTER
857 A WITH RING ABOVE).
859 The bug reports suggest two different patches; unfortunately, neither
860 works properly. For example:
862 Use a Swedish keyboard layout
864 (setq ns-alternate-modifier nil)
868 Today, this correctly yields that s-] is undefined. With either
869 of the two patches, Emacs responds that s-9 was pressed.
871 More investigation is needed to fix this problem.
874 - https://debbugs.gnu.org/19977
875 - https://debbugs.gnu.org/21330
876 - https://debbugs.gnu.org/21551
878 **** Toggling the toolbar in fullheight or maximized modes
880 The toolbar, in the NS interface, is not considered part of the text
881 area. When it is toggled, the Emacs frame change height accordingly.
883 Unfortunately, this also occurs when the frame is in fullheight or
884 maximized modes (N.B. this is not the same as "fullscreen"). The
885 effect is that the full frame size either increases (stretching down
886 below the lower edge of the screen) or decreases (leaving space
887 between the lower edge of the frame and the lower edge of the screen).
889 A better solution would be for the frame to retain its size,
890 i.e. change the text area.
892 This is related to the 'frame-inhibit-implied-resize' issue.
894 **** The event loop does not redraw.
895 A problem is that redraw don't happen during resize,
896 because we can't break out from the NSapp loop during resize.
897 There was a special trick to detect mouse press in the lower right
898 corner and track mouse movements, but this did not work well, and was
899 not scalable to the new Lion "resize on every window edge" behavior.
900 [As of trunk r109635, 2012-08-15, the event loop no longer polls.]
902 **** (mouse-avoidance-mode 'banish) then minimize Emacs, will pop window back
903 up on top of all others (probably fixed in bug#17439)
905 **** free_frame_resources, face colors
907 **** Numeric keysetting bug.
909 *** Mac-related
911 **** Open file:/// URLs.
913 **** Put frame autopositioning into C code somewhere -- if loc = same, offset.
915 **** Automap ctrl-mouse-1 to mouse-3.
917 **** Deal with Finder aliases somehow.
919 **** Ctrl-F2 won't pull up menus.
921 *** Other / Low Priority:
923 **** Better recognition of Unicode scripts / Greek / composition.
925 **** Undo for color-drag face customization.
927 ** Bidirectional editing
929 *** Support reordering structured text
930 Two important use cases: (1) comments and strings in program sources,
931 and (2) text with markup, like HTML or XML.
933 One idea is to invent a special text property that would instruct the
934 display engine to reorder only the parts of buffer text covered by
935 that property. The display engine will then push its state onto the
936 iterator stack, restrict the bidi iterator to accessing only the
937 portion of buffer text covered by the property, reorder the text, then
938 pop its state from stack and continue as usual. This will require
939 minor changes in the bidi_it structure.
941 This design requires Lisp-level code to put the text properties on the
942 relevant parts of the buffer text. That could be done using JIT
943 fontifications, or as a preliminary processing when the file is
944 visited. With HTML/XML, the code that puts text properties needs to
945 pay attention to the bidi directives embedded in the HTML/XML stream.
947 *** Allow the user to control the direction of the UI
949 **** Introduce user option to control direction of mode line.
950 One problem is the header line, which is produced by the same routines
951 as the mode line. While it makes sense to have the mode-line
952 direction controlled by a single global variable, header lines are
953 buffer-specific, so they need a separate treatment in this regard.
955 **** User options to control direction of menu bar and tool bar.
956 For the tool bar, it's relatively easy: set it.paragraph_embedding
957 in redisplay_tool_bar according to the user variable, and make
958 f->desired_tool_bar_string multibyte with STRING_SET_MULTIBYTE. Some
959 minor changes will be needed to set the right_box_line_p and
960 left_box_line_p flags correctly for the R2L tool bar.
962 However, it makes no sense to display the tool bar right to left if
963 the menu bar cannot be displayed in the same direction.
965 R2L menu bar is tricky for the same reasons as the mode line. In
966 addition, toolkit builds create their menu bars in toolkit-specific
967 parts of code, bypassing xdisp.c, so those parts need to be enhanced
968 with toolkit-specific code to display the menu bar right to left.
970 ** Custom
972 *** Extend :set-after to also mean initialize after.
973 If defcustom A specifies :set-after '(B), then if a user customizes
974 both A and B, custom will set A after B. But if the user only customizes
975 A, then if B is already defined, it gets left at its original setting.
976 Instead, if B has not been customized it should be re-initialized
977 (on the assumption that the default value depends on A).
978 See the places where we manually call custom-reevaluate-setting,
979 such as for mail-host-address and user-mail-address in startup.el.
981 ** ImageMagick support
983 *** image-type-header-regexps priorities the jpeg loader over the
984 ImageMagick one. This is not wrong, but how should a user go about
985 preferring the ImageMagick loader? The user might like zooming etc in jpegs.
987 Try (setq image-type-header-regexps nil) for a quick hack to prefer
988 ImageMagick over the jpg loader.
990 *** For some reason it's unbearably slow to look at a page in a large
991 image bundle using the :index feature. The ImageMagick "display"
992 command is also a bit slow, but nowhere near as slow as the Emacs
993 code. It seems ImageMagick tries to unpack every page when loading the
994 bundle. This feature is not the primary usecase in Emacs though.
996 ImageMagick 6.6.2-9 introduced a bugfix for single page djvu load. It
997 is now much faster to use the :index feature, but still not very fast.
999 *** Try to cache the num pages calculation. It can take a while to
1000 calculate the number of pages, and if you need to do it for each page
1001 view, page-flipping becomes uselessly slow.
1003 *** Integrate with image-dired.
1005 *** Integrate with docview.
1007 *** Integrate with image-mode.
1008 Some work has been done, e.g. M-x image-transform-fit-to-height will
1009 fit the image to the height of the Emacs window.
1011 *** Look for optimizations for handling images with low depth.
1012 Currently the code seems to default to 24 bit RGB which is costly for
1013 images with lower bit depth.
1015 *** Decide what to do with some uncommitted imagemagick support
1016 functions for image size etc.
1018 ** nxml mode
1020 *** High priority
1022 **** Command to insert an element template, including all required
1023 attributes and child elements. When there's a choice of elements
1024 possible, we could insert a comment, and put an overlay on that
1025 comment that makes it behave like a button with a pop-up menu to
1026 select the appropriate choice.
1028 **** Command to tag a region. With a schema should complete using legal
1029 tags, but should work without a schema as well.
1031 **** Provide a way to conveniently rename an element. With a schema should
1032 complete using legal tags, but should work without a schema as well.
1034 *** Outlining
1036 **** Implement C-c C-o C-q.
1038 **** Install pre/post command hook for moving out of invisible section.
1040 **** Put a modify hook on invisible sections that expands them.
1042 **** Integrate dumb folding somehow.
1044 **** An element should be able to be its own heading.
1046 **** Optimize to avoid complete buffer scan on each command.
1048 **** Make it work with HTML-style headings (i.e. level indicated by
1049 name of heading element rather than depth of section nesting).
1051 **** Recognize root element as a section provided it has a title, even
1052 if it doesn't match section-element-name-regex.
1054 **** Support for incremental search automatically making hidden text visible.
1056 **** Allow title to be an attribute.
1058 **** Command that says to recognize the tag at point as a section/heading.
1060 **** Explore better ways to determine when an element is a section
1061 or a heading.
1063 **** rng-next-error needs to either ignore invisible portion or reveal it
1064 (maybe use isearch oriented text properties).
1066 **** Errors within hidden section should be highlighted by underlining the
1069 **** Make indirect buffers work.
1071 **** How should nxml-refresh outline recover from non well-formed tags?
1073 **** Hide tags in title elements?
1075 **** Use overlays instead of text properties for holding outline state?
1076 Necessary for indirect buffers to work?
1078 **** Allow an outline to go in the speedbar.
1080 **** Split up outlining manual section into subsections.
1082 **** More detail in the manual about each outlining command.
1084 **** More menu entries for hiding/showing?
1086 **** Indication of many lines have been hidden?
1088 *** Locating schemas
1090 **** Should rng-validate-mode give the user an opportunity to specify a
1091 schema if there is currently none? Or should it at least give a hint
1092 to the user how to specify a non-vacuous schema?
1094 **** Support for adding new schemas to schema-locating files.
1095 Add documentElement and namespace elements.
1097 **** C-c C-w should be able to report current type id.
1099 **** Implement doctypePublicId.
1101 **** Implement typeIdBase.
1103 **** Implement typeIdProcessingInstruction.
1105 **** Support xml:base.
1107 **** Implement group.
1109 **** Find preferred prefix from schema-locating files. Get rid of
1112 **** Inserting document element with vacuous schema should complete using
1113 document elements declared in schema locating files, and set schema
1116 **** Add a ruleType attribute to the <include> element?
1118 **** Allow processing instruction in prolog to contain the compact syntax
1119 schema directly.
1121 **** Use RDDL to locate a schema based on the namespace URI.
1123 **** Should not prompt to add redundant association to schema locating file.
1125 **** Command to reload current schema.
1127 *** Schema-sensitive features
1129 **** Should filter dynamic markup possibilities using schema validity, by
1130 adding hook to nxml-mode.
1132 **** Dynamic markup word should (at least optionally) be able to look in
1133 other buffers that are using nxml-mode.
1135 **** Should clicking on Invalid move to next error if already on an error?
1137 **** Take advantage of a:documentation. Needs change to schema format.
1139 **** Provide feasible validation (as in Jing) toggle.
1141 **** Save the validation state as a property on the error overlay to enable
1142 more detailed diagnosis.
1144 **** Provide an Error Summary buffer showing all the validation errors.
1146 **** Pop-up menu. What is useful? Tag a region (should be grayed out if
1147 the region is not balanced). Suggestions based on error messages.
1149 **** Have configurable list of namespace URIs so that we can provide
1150 namespace URI completion on extension elements or with schema-less documents.
1152 **** Allow validation to handle XInclude.
1154 **** ID/IDREF support.
1156 *** Completion
1158 **** Make it work with icomplete. Only use a function to complete when
1159 some of the possible names have undeclared namespaces.
1161 **** How should C-return in mixed text work?
1163 **** When there's a vacuous schema, C-return after < will insert the end-tag.
1164 Is this a bug or a feature?
1166 **** After completing start-tag, ensure we don't get unhelpful message
1167 from validation
1169 **** Syntax table for completion.
1171 **** Should complete start-tag name with a space if namespace attributes
1172 are required.
1174 **** When completing start-tag name with no prefix and it doesn't match
1175 should try to infer namespace from local name.
1177 **** Should completion pay attention to characters after point? If so, how?
1179 **** When completing start-tag name, add required atts if only one required
1182 **** When completing attribute name, add attribute value if only one value
1183 is possible.
1185 **** After attribute-value completion, insert space after close delimiter
1186 if more attributes are required.
1188 **** Complete on enumerated data values in elements.
1190 **** When in context that allows only elements, should get tag
1191 completion without having to type < first.
1193 **** When immediately after start-tag name, and name is valid and not
1194 prefix of any other name, should C-return complete on attribute names?
1196 **** When completing attributes, more consistent to ignore all attributes
1197 after point.
1199 **** Inserting attribute value completions needs to be sensitive to what
1200 delimiter is used so that it quotes the correct character.
1202 **** Complete on encoding-names in XML decl.
1204 **** Complete namespace declarations by searching for all namespaces
1205 mentioned in the schema.
1207 *** Well-formed XML support
1209 **** Deal better with Mule-UCS
1211 **** Deal with UTF-8 BOM when reading.
1213 **** Complete entity names.
1215 **** Provide some support for entity names for MathML.
1217 **** Command to repeat the last tag.
1219 **** Support for changing between character references and characters.
1220 Need to check that context is one in which character references are
1221 allowed. xmltok prolog parsing will need to distinguish parameter
1222 literals from other kinds of literal.
1224 **** Provide a comment command to bind to M-; that works better than the
1225 normal one.
1227 **** Make indenting in a multi-line comment work.
1229 **** Structure view. Separate buffer displaying element tree.
1230 Be able to navigate from structure view to document and vice-versa.
1232 **** Flash matching >.
1234 **** Smart selection command that selects increasingly large syntactically
1235 coherent chunks of XML. If point is in an attribute value, first
1236 select complete value; then if command is repeated, select value plus
1237 delimiters, then select attribute name as well, then complete
1238 start-tag, then complete element, then enclosing element, etc.
1240 **** ispell integration.
1242 **** Block-level items in mixed content should be indented, e.g:
1243 <para>This is list:
1247 **** Provide option to indent like this:
1248 <para>This is a paragraph
1249 occupying multiple lines.</para>
1251 **** Option to add make a / that closes a start-tag electrically insert a
1252 space for the XHTML guys.
1254 **** C-M-q should work.
1256 *** Datatypes
1258 **** Figure out workaround for CJK characters with regexps.
1260 **** Does category C contain Cn?
1262 **** Do ENTITY datatype properly.
1264 *** XML Parsing Library
1266 **** Parameter entity parsing option, nil (never), t (always),
1267 unless-standalone (unless standalone="yes" in XML declaration).
1269 **** When a file is currently being edited, there should be an option to
1270 use its buffer instead of the on-disk copy.
1272 *** Handling all XML features
1274 **** Provide better support for editing external general parsed entities.
1275 Perhaps provide a way to force ignoring undefined entities; maybe turn
1276 this on automatically with <?xml encoding=""?> (with no version
1279 **** Handle internal general entity declarations containing elements.
1281 **** Handle external general entity declarations.
1283 **** Handle default attribute declarations in internal subset.
1285 **** Handle parameter entities (including DTD).
1287 *** RELAX NG
1289 **** Do complete schema checking, at least optionally.
1291 **** Detect include/external loops during schema parse.
1293 **** Coding system detection for schemas. Should use utf-8/utf-16 per the
1294 spec. But also need to allow encodings other than UTF-8/16 to support
1295 CJK charsets that Emacs cannot represent in Unicode.
1297 *** Catching XML errors
1299 **** Check public identifiers.
1301 **** Check default attribute values.
1303 *** Performance
1305 **** Explore whether overlay-recenter can cure overlays performance problems.
1307 **** Cache schemas. Need to have list of files and mtimes.
1309 **** Make it possible to reduce rng-validate-chunk-size significantly,
1310 perhaps to 500 bytes, without bad performance impact: don't do
1311 redisplay on every chunk; pass continue functions on other uses of
1314 **** Cache after first tag.
1316 **** Introduce a new name class that is a choice between names (so that
1317 we can use member)
1319 **** intern-choice should simplify after patterns with same 1st/2nd args
1321 **** Large numbers of overlays slow things down dramatically. Represent
1322 errors using text properties. This implies we cannot incrementally
1323 keep track of the number of errors, in order to determine validity.
1324 Instead, when validation completes, scan for any characters with an
1325 error text property; this seems to be fast enough even with large
1326 buffers. Problem with error at end of buffer, where there's no
1327 character; need special variable for this. Need to merge face from
1328 font-lock with the error face: use :inherit attribute with list of two
1329 faces. How do we avoid making rng-valid depend on nxml-mode?
1331 *** Error recovery
1333 **** Don't stop at newline in looking for close of start-tag.
1335 **** Use indentation to guide recovery from mismatched end-tags
1337 **** Don't keep parsing when currently not well-formed but previously
1340 **** Try to recover from a bad start-tag by popping an open element if
1341 there was a mismatched end-tag unaccounted for.
1343 **** Try to recover from a bad start-tag open on the hypothesis that there
1344 was an error in the namespace URI.
1346 **** Better recovery from ill-formed XML declarations.
1348 *** Usability improvements
1350 **** Should print a "Parsing..." message during long movements.
1352 **** Provide better position for reference to undefined pattern error.
1354 **** Put Well-formed in the mode-line when validating against any-content.
1356 **** Trim marking of illegal data for leading and trailing whitespace.
1358 **** Show Invalid status as soon as we are sure it's invalid, rather than
1359 waiting for everything to be completely up to date.
1361 **** When narrowed, Valid or Invalid status should probably consider only
1362 validity of narrowed region.
1364 *** Bug fixes
1366 **** Need to give an error for a document like: <foo/><![CDATA[ ]]>
1368 **** Make nxml-forward-balanced-item work better for the prolog.
1370 **** Make filling and indenting comments work in the prolog.
1372 **** Should delete RNC Input buffers.
1374 **** Figure out what regex use for NCName and use it consistently,
1376 **** Should have not-well-formed tokens in ref.
1378 **** Require version in XML declaration? Probably not because prevents
1379 use for external parsed entities. At least forbid standalone without version.
1381 **** Reject schema that compiles to rng-not-allowed-ipattern.
1383 **** Move point backwards on schema parse error so that it's on the right token.
1385 *** Internal
1387 **** Use rng-quote-string consistently.
1389 **** Use parsing library for XML to texinfo conversion.
1391 **** Rename xmltok.el to nxml-token.el. Use nxml-t- prefix instead of
1392 xmltok-. Change nxml-t-type to nxml-t-token-type, nxml-t-start to
1395 **** Can we set fill-prefix to nil and rely on indenting?
1397 **** xmltok should make available replacement text of entities containing
1400 **** In rng-valid, instead of using modification-hooks and
1401 insert-behind-hooks on dependent overlays, use same technique as nxml-mode.
1403 *** Fontification
1405 **** Allow face to depend on element qname, attribute qname, attribute
1406 value. Use list with pairs of (R . F), where R specifies regexps and
1407 F specifies faces. How can this list be made to depend on the document type?
1409 *** Other
1411 **** Support RELAX NG XML syntax (use XML parsing library).
1413 **** Support W3C XML Schema (use XML parsing library).
1415 **** Command to infer schema from current document (like trang).
1417 *** Schemas
1419 **** XSLT schema should take advantage of RELAX NG to express cooccurrence
1420 constraints on attributes (e.g. xsl:template).
1422 *** Documentation
1424 **** Move material from README to manual.
1426 **** Document encodings.
1428 *** Notes
1430 **** How can we allow an error to be displayed on a different token from
1431 where it is detected? In particular, for a missing closing ">" we
1432 will need to display it at the beginning of the following token. At the
1433 moment, when we parse the following token the error overlay will get cleared.
1435 **** How should rng-goto-next-error deal with narrowing?
1437 **** Perhaps should merge errors having same start position even if they
1438 have different ends.
1440 **** How to handle surrogates? One possibility is to be compatible with
1441 utf8.e: represent as sequence of 4 chars. But utf-16 is incompatible
1442 with this.
1444 **** Should we distinguish well-formedness errors from invalidity errors?
1445 (I think not: we may want to recover from a bad start-tag by implying
1446 an end-tag.)
1448 **** Seems to be a bug with Emacs, where a mouse movement that causes
1449 help-echo text to appear counts as pending input but does not cause
1450 idle timer to be restarted.
1452 **** Use XML to represent this file.
1454 **** I had a TODO which said simply "split-string". What did I mean?
1456 **** Investigate performance on large files all on one line.
1458 *** Issues for Emacs versions >= 22
1460 **** Take advantage of UTF-8 CJK support.
1462 **** Supply a next-error-function.
1464 **** Investigate this NEWS item "Emacs now tries to set up buffer coding
1465 systems for HTML/XML files automatically."
1467 **** Take advantage of the pointer text property.
1469 **** Leverage char-displayable-p.
1471 ** RefTeX
1473 *** Provide a wdired-like mode for editing RefTeX TOC buffers.
1474 As a first step, renaming of sections could be supported. Ultimately,
1475 it would be great if it also supported moving sections, e.g., by
1476 killing and yanking or providing org-mode like "move section
1477 upwards/downwards" commands. However, that's not so easy in the
1478 presence of multi-file documents.
1480 * Internal changes
1482 ** Cleanup all the GC_ mark bit stuff -- there is no longer any distinction
1483 since the mark bit is no longer stored in the Lisp_Object itself.
1485 ** Refine the 'predicate' arg to read-file-name.
1486 Currently, it mixes up the predicate to apply when doing completion and the
1487 one to use when terminating the selection.
1489 ** Merge ibuffer.el and buff-menu.el.
1490 More specifically do what's needed to make ibuffer.el the default,
1491 or just an extension of buff-menu.el.
1493 ** Replace linum.el with nlinum.el
1496 ** Merge sendmail.el and messages.el.
1497 Probably not a complete merge, but at least arrange for messages.el to be
1498 a derived mode of sendmail.el. Or arrange for messages.el to be split
1499 into a small core and "the rest" so that we use less resources as long as
1500 we stick to the features provided in sendmail.el.
1502 ** Replace gmalloc.c with the modified Doug Lea code from the current
1503 GNU libc so that the special mmapping of buffers can be removed --
1504 that apparently loses under Solaris, at least. [fx has mostly done
1507 ** Rewrite make-docfile to be clean and maintainable.
1508 It might be better to replace it with Lisp, using the byte compiler.
1511 ** Add an inferior-comint-minor-mode to capture the common set of operations
1512 offered by major modes that offer an associated inferior
1513 comint-derived mode. I.e. basically make cmuscheme.el/inf-lisp.el generic.
1514 For use by sml-mode, python-mode, tex-mode, scheme-mode, lisp-mode,
1515 haskell-mode, tuareg-mode, ...
1517 ** Add "link" button class
1518 Add a standard button-class named "link", and make all other link-like
1519 button classes inherit from it. Set the default face of the "link" button
1520 class to the standard "link" face.
1522 * Wishlist items:
1524 ** Maybe replace etags.c with a Lisp implementation.
1527 ** Maybe replace lib-src/rcs2log with a Lisp implementation.
1528 It wouldn't have to be a complete replacement, just enough
1529 for vc-rcs-update-changelog.
1531 * Other known bugs:
1533 ** 'make-frame' forgets unhandled parameters, at least for X11 frames.
1535 ** a two-char comment-starter whose two chars are symbol constituents will
1536 not be noticed if it appears within a word.
1539 This file is part of GNU Emacs.
1541 GNU Emacs is free software: you can redistribute it and/or modify
1542 it under the terms of the GNU General Public License as published by
1543 the Free Software Foundation, either version 3 of the License, or
1544 (at your option) any later version.
1546 GNU Emacs is distributed in the hope that it will be useful,
1547 but WITHOUT ANY WARRANTY; without even the implied warranty of
1548 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1549 GNU General Public License for more details.
1551 You should have received a copy of the GNU General Public License
1552 along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
1554 ;; Local Variables:
1555 ;; coding: utf-8
1556 ;; End: