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1 Emacs TODO List -*-outline-*-
3 Copyright (C) 2001-2017 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 <http://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 ** Add new 'switch' byte-code
39 This byte-code would take one argument from the stack (the object to test)
40 and one argument from the constant-pool (a switch table, implemented as an
41 'eq' hash table) and would jump to the "label" contained in the hash table.
43 Then add a 'case' special-form that can be compiled to this byte-code.
44 This would behave just like cl-case, but instead of expanding to cond+eq it
45 would be its own special form and would be compiled specially.
47 Then change pcase to use 'case' when applicable.
49 Then change the byte-compiler to recognize (cond ((eq x 'foo) bar) ...)
50 and turn it into a 'case' for more efficient execution.
52 ** Improve the byte-compiler to recognize immutable (lexical) bindings
53 and get rid of them if they're used only once and/or they're bound to
54 a constant expression.
56 Such things aren't present in hand-written code, but macro expansion and
57 defsubst can often end up generating things like
58 (funcall (lambda (arg) (body)) actual) which then get optimized to
59 (let ((arg actual)) (body)) but should additionally get optimized further
60 when 'actual' is a constant/copyable expression.
62 ** Add an "indirect goto" byte-code and use it for local lambda expressions.
63 E.g. when you have code like
65 (let ((foo (lambda (x) bar)))
67 (funcall foo toto)
68 (blabla (funcall foo titi))))
70 turn those 'funcalls' into jumps and their return into indirect jumps back.
72 ** Compile efficiently local recursive functions
74 Similar to the previous point, we should be able to handle something like
76 (letrec ((loop () (blabla) (if (toto) (loop))))
79 which ideally should generate the same byte-code as
81 (while (progn (blabla) (toto)))
83 * Things that were planned for Emacs-24
85 ** concurrency: including it as an "experimental" compile-time option
86 sounds good. Of course there might still be big questions around "which form
87 of concurrency" we'll want.
88 ** better support for dynamic embedded graphics: I like this idea (my
89 mpc.el code could use it for the volume widget), though I wonder if the
90 resulting efficiency will be sufficient.
91 ** Spread Semantic.
92 ** Improve the "code snippets" support: consolidate skeleton.el, tempo.el,
93 and expand.el (any other?) and then advertise/use/improve it.
94 ** Improve VC: yes, there's a lot of work to be done there :-(
96 ** Random things that cross my mind right now that I'd like to see (some of
97 them from my local hacks), but it's not obvious at all whether they'll
98 make it.
99 *** prog-mode could/should provide a better fill-paragraph default
100 that uses syntax-tables to recognize string/comment boundaries.
101 *** provide more completion-at-point-functions. Make existing
102 in-buffer completion use completion-at-point.
103 *** "functional" function-key-map that would make it easy to add (and
104 remove) mappings like "FOO-mouse-4 -> FOO-scroll-down",
105 "FOO-tab -> ?\FOO-\t", "uppercase -> lowercase", "[fringe KEY...] ->
106 [KEY]", "H-FOO -> M-FOO", "C-x C-y FOO -> H-FOO", ...
108 * Things related to elpa.gnu.org.
110 ** Move idlwave to elpa.gnu.org.
111 Need to sync up the Emacs and external versions.
112 See <http://lists.gnu.org/archive/html/emacs-devel/2014-07/msg00008.html>
114 ** Move Org mode to elpa.gnu.org.
115 See <http://lists.gnu.org/archive/html/emacs-devel/2014-08/msg00300.html>
118 ** Move verilog-mode to elpa.gnu.org.
119 See <http://lists.gnu.org/archive/html/emacs-devel/2015-02/msg01180.html>
121 ** Move vhdl-mode to elpa.gnu.org.
122 See <http://lists.gnu.org/archive/html/emacs-devel/2015-02/msg01180.html>
124 * Simple tasks. These don't require much Emacs knowledge, they are
125 suitable for anyone from beginners to experts.
127 ** Convert modes that use view-mode to be derived from special-mode instead.
129 ** Major modes should have a menu entry.
131 ** Check if all items on the mode-line have a suitable tooltip for all modes.
133 ** edebug and debugger-mode should have a toolbar.
134 It can use the same icons as gud.
136 ** Check what minor modes don't use define-minor-mode and convert them
137 to use it.
139 ** Convert all defvars with leading '*' in the doc-strings into defcustoms
140 of appropriate :type and :group.
142 ** Remove any leading '*'s from defcustom doc-strings.
143 [done?] [A lot of them are in CC Mode.]
145 ** Remove unnecessary autoload cookies from defcustoms.
146 This needs a bit of care, since often people have become used to
147 expecting such variables to always be defined, eg when they modify
148 things in their .emacs.
150 ** See if other files can use generated-autoload-file (see eg ps-print).
152 ** Write more tests. Pick a fixed bug from the database, write a test
153 case to make sure it stays fixed. Or pick your favorite programming
154 major-mode, and write a test for its indentation. Or a version
155 control backend, and write a test for its status parser. Etc.
156 See test/automated for examples.
158 * Small but important fixes needed in existing features:
160 ** Flymake's customization mechanism needs to be both simpler (fewer
161 levels of indirection) and better documented, so it is easier to
162 understand. I find it quite hard to figure out what compilation
163 command it will use.
165 I suggest totally rewriting that part of Flymake, using the simplest
166 mechanism that suffices for the specific needs. That will be easy
167 for users to customize.
169 ** Distribute a bar cursor of width > 1 evenly between the two glyphs
170 on each side of the bar (what to do at the edges?).
172 ** revert-buffer should eliminate overlays and the mark.
173 For related problems consult the thread starting with
176 ** erase-buffer should perhaps disregard read-only properties of text.
178 ** Fix the kill/yank treatment of invisible text. At the moment,
179 invisible text is placed in the kill-ring, so that the contents of
180 the ring may not correspond to the text as displayed to the user.
181 It ought to be possible to omit text which is invisible (due to a
182 text-property, overlay, or selective display) from the kill-ring.
184 ** Feature to change cursor shape when Emacs is idle (for more than
185 a specified time).
187 ** The buttons at the top of a custom buffer should not omit
188 variables whose values are currently hidden.
190 ** Clean up the variables in browse-url. Perhaps use a shell command string to
191 specify the browser instead of the mushrooming set of functions.
192 See also ESR's proposal for a BROWSER environment variable
195 ** Enhance scroll-bar to handle tall line (similar to line-move).
197 ** In Custom buffers, put the option that turns a mode on or off first,
198 using a heuristic of some kind?
200 ** Define recompute-arg and recompute-arg-if for fix_command to use.
201 See rms message of 11 Dec 05 in
203 and the rest of that discussion.
205 ** In Emacs Info, examples of using Customize should be clickable
206 and they should create Custom buffers.
208 ** The toolbar should show keyboard equivalents in its tooltips.
210 ** Add function to redraw the tool bar.
212 ** Redesign the load-history data structure so it can cope better
213 with evaluating definitions of the same function from different files,
214 recording which file the latest definition came from.
216 ** make back_comment use syntax-ppss or equivalent.
218 ** Consider improving src/sysdep.c's search for a fqdn.
221 ** Find a proper fix for rcirc multiline nick adding.
224 ** Check for any included packages that define obsolete bug-reporting commands.
225 Change them to use report-emacs-bug.
226 *** Related functions:
227 **** gnus-bug
228 **** report-calc-bug
229 **** org-submit-bug-report
230 **** lm-report-bug
231 **** tramp-bug
232 **** c-submit-bug-report
233 **** ffap-bug and ffap-submit-bug (obsoleted)
234 [Do all of them need changing?]
236 ** Allow fringe indicators to display a tooltip (provide a help-echo property?)
238 ** Add a defcustom that supplies a function to name numeric backup files,
239 like make-backup-file-name-function for non-numeric backup files.
241 ** 'dired-mode' should specify the semantics of 'buffer-modified-p' for
242 dired buffers and DTRT WRT 'auto-revert-mode'.
244 ** Check uses of prin1 for error-handling.
247 * Important features:
249 ** "Emacs as word processor"
251 rms writes:
252 25 years ago I hoped we would extend Emacs to do WYSIWYG word
253 processing. That is why we added text properties and variable
254 width fonts. However, more features are still needed to achieve this.
256 ** Extend text-properties and overlays
257 *** Several text-property planes
258 This would get us rid of font-lock-face property (and I'd be happy to
259 get rid of char-property-alias-alist as well) since font-lock would
260 simply use the 'face' property in the 'font-lock' plane.
262 Basically 'put-text-property' and friends would take an extra argument PLANE
263 (maybe the best backward-compatible way to do that is to make it so that
264 PROPERTY can be a cons cell (PLANE . PROP)). So font-lock would
265 do (put-text-property start end '(font-lock . face) value).
267 All the properties coming from the various planes would get merged via an Elisp
268 function (so it can merge 'face' differently than 'keymap' or it could give
269 different priorities to different planes (we could imagine enabling/disabling
270 planes)). The merging would not happen lazily while looking up properties but
271 instead it would take place eagerly in 'add-text-properties'. This is based on
272 the idea that it's much more frequent to lookup properties than to
273 modify them. Also, when properties are looked up during redisplay, we
274 generally can't run Elisp code, whereas we generally can do that when
275 properties are added.
277 *** Move overlays to intervals.c
279 Currently overlays are implemented as (two) sorted singly linked lists (one
280 for overlays_before some position and one for overlay_after that
281 position, for some quirky definition of "before" and "after").
282 The function 'overlay-recenter' changes the position used for the split
283 (and is called internally in various situations).
285 Each overlay is itself implemented with two markers (which keep track of
286 the overlay-start and overlay-end). Markers are implemented as
287 a non-sorted singly linked list of markers. So every text
288 insertion/deletion requires O(N) time, where N is the number of markers
289 since we have to go down that list to update those markers that are
290 affected by the modification.
292 You can start in src/buffer.[ch], maybe grepping for overlays_before for
293 a starting point.
295 Text-properties, OTOH, are implemented with a (mostly) balanced binary
296 tree. This is implemented in src/intervals.[ch].
298 So we'd like to change overlays so that they don't use markers (and we
299 don't keep them in two sorted singly-linked lists) any more. Instead,
300 we'll store them inside the balanced binary tree used for
301 text-properties. I think we can use the "augmented tree" approach
302 described in https://en.wikipedia.org/wiki/Interval_tree.
304 To ease up debugging during development, I'd guess the implementation
305 would first add the new stuff, keeping the old stuff (i.e. add to
306 Lisp_Overlay whichever fields are needed for the new code, while keeping
307 the old ones, add needed overlay fields to the intervals tree, but keep
308 the old fields, the overlays_before etc...). This way, you can add
309 consistency checks that make sure the new code computes the same results
310 as the old code. And once that works well, we can remove the old code
311 and old fields.
313 ** Having tabs above a window to switch buffers in it.
315 ** "Perspectives" are named persistent window configurations. We have
316 had the window configuration mechanism in GNU Emacs since the
317 beginning but we have never developed a good user interface to take
318 advantage of them. Eclipse's user interface seems to be good.
320 Perspectives work well even if you do the equivalent of C-x 4 C-f
321 because of the distinction between view windows vs file windows. In
322 Emacs this is more or less the "dedicated window" feature, but we have
323 never really made it work for this.
325 Perspectives also need to interact with the tabs.
327 ** FFI (foreign function interface)
328 See eg http://lists.gnu.org/archive/html/emacs-devel/2013-10/msg00246.html
330 One way of doing this is to start with fx's dynamic loading, and use it
331 to implement things like auto-loaded buffer parsers and database
332 access in cases which need more than Lisp.
334 ** Replace unexec with a more portable form of dumping
335 See eg http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01034.html
338 One way is to provide portable undumping using mmap (per gerd design).
340 ** Imenu could be extended into a file-structure browsing mechanism
341 using code like that of customize-groups.
343 ** Display something in the margin on lines that have compilation errors.
345 ** Compilation error navigation bar, parallel to the scroll bar,
346 indicating where in the buffer there are compilation errors.
347 Perhaps we could arrange to display these error indications on top
348 of the scroll bar itself. That depends on to what extent toolkit
349 scroll bars are extensible.
351 ** Provide user-friendly ways to list all available font families,
352 list fonts, display a font as a sample, etc. [fx is looking at
353 multilingual font selection for the Unicode branch of Emacs.]
355 ** Provide a convenient way to select a color with the mouse.
357 ** Rewrite the face code to be simpler, clearer and faster.
359 ** Program Enriched mode to read and save in RTF. [Is there actually a
360 decent single definition of RTF? Maybe see info at
361 http://latex2rtf.sourceforge.net/.] This task seems to be addressed
362 by http://savannah.nongnu.org/projects/emacs-rtf/, which is still in
363 very early stages.
365 Another place to look is the Wikipedia article at
368 It currently points to the latest spec of RTF v1.9.1 at
371 ** Implement primitive and higher-level functions to allow filling
372 properly with variable-pitch faces.
374 ** Implement intelligent search/replace, going beyond query-replace
375 (see http://groups.csail.mit.edu/uid/projects/clustering/chi04.pdf).
377 ** Implement other text formatting properties.
378 *** Footnotes that can appear either in place or at the end of the page.
379 *** text property that says "don't break line in middle of this".
380 Don't break the line between two characters that have the
381 same value of this property.
382 *** Discretionary hyphens that are not visible when they are at end of line.
384 ** Internationalize Emacs's messages.
386 ** Set up a facility to save backtraces when errors happen during
387 specified filters, specified timers, and specified hooks.
389 ** Install firstname.lastname@example.org's no-flicker change.
391 ** Add a "current vertical pixel level" value that goes with point,
392 so that motion commands can also move through tall images.
393 This value would be to point as window-vscroll is to window-start.
395 ** Address internationalization of symbols names essentially
396 as documentation, e.g. in command names and Custom.
398 ** Make the Lucid menu widget display multilingual text. [This
399 probably needs to be done from actual Emacs buffers, either directly
400 in the menu or by rendering in an unmapped window and copying the
401 pixels. The current code assumes a specific locale; that isn't good
402 enough even if X can render the arbitrary text] [The gtk
403 port now displays multilingual text in menus, but only insofar as
404 Emacs can encode it as utf-8 and gtk can display the result.]
405 Maybe making Lucid menus work like Gtk's (i.e. just force utf-8) is good
406 enough now that Emacs can encode most chars into utf-8.
408 ** The GNUstep port needs some serious attention, ideally from someone
409 familiar with GNUstep and Objective C.
411 * Other features we would like:
413 ** A more modern printing interface. One that pops up a dialog that lets
414 you choose printer, page style, etc.
415 Integration with the Gtk print dialog is apparently difficult. See eg:
419 ** Allow frames(terminals) created by emacsclient to inherit their environment
420 from the emacsclient process.
422 ** Give Tar mode all the features of Archive mode.
424 ** Create a category of errors called 'process-error'
425 for some or all errors associated with using subprocesses.
427 ** Maybe reinterpret 'parse-error' as a category of errors
428 and put some other errors under it.
430 ** Make byte-compile warn when a doc string is too wide.
432 ** Make byte-optimization warnings issue accurate line numbers.
434 ** Record the sxhash of the default value for customized variables
435 and notify the user (maybe by adding a menu item or toolbar button,
436 as the detection can occur during autoload time) when the default
437 changes (meaning that new versions of the Lisp source with a changed
438 default value got installed) and offer ediff on the respective
439 customization buffers.
441 ** Emacs Lisp mode could put an overlay on the defun for every
442 function that has advice. The overlay could have 'after-text' like
443 " [Function has advice]". It might look like (defun foo [Function
444 has advice] (x y) The overlay could also be a button that you could
445 use to view the advice.
447 ** Add a function to get the insertion-type of the markers in an overlay.
449 ** ange-ftp
450 *** understand sftp
451 This is hard to make work because sftp doesn't print status messages.
453 *** Use MLS for ange-ftp-insert-directory if a list of files is specified.
455 ** Ability to map a key, including all modified-combinations.
456 E.g map mouse-4 to wheel-up as well as M-mouse-4 -> M-wheel-up
457 M-C-mouse-4 -> M-C-wheel-up, H-S-C-M-s-double-mouse-4 ->
458 H-S-C-M-s-double-wheel-up, ...
460 ** Beefed-up syntax-tables.
461 *** recognize multi-character syntactic entities like 'begin' and 'end'.
462 *** nested string-delimiters (for PostScript's (foo(bar)baz) strings).
463 *** support for infix operators (with precedence).
464 *** support for the $ (paired delimiter) in parse-partial-sexp.
465 *** support for hook-chars whose effect on the parsing-state is specified
466 by elisp code. Thus a char could both close a string and open a comment
467 at the same time and do it in a context-sensitive way.
468 *** ability to add mode-specific data to the partial-parse-state.
470 ** Add a way to convert a keyboard macro to equivalent Lisp code.
472 ** Have a command suggestion help system that recognizes patterns
473 of commands which could be replaced with a simpler common command.
474 It should not make more than one suggestion per 10 minutes.
476 ** Add a way to define input methods by computing them (when first used)
477 from other input methods. Then redefine C-x 8 to use a
478 user-selected input method, with the default being the union of
479 latin-1-prefix and latin-1-postfix.
481 ** Implement a clean way to use different major modes for
482 different parts of a buffer. This could be useful in editing
483 Bison input files, for instance, or other kinds of text
484 where one language is embedded in another language. See
485 http://www.loveshack.ukfsn.org/emacs/multi-mode.el and also
486 mmm-mode, as reference for approaches taken by others.
488 ** Arrange a way for an input method to return the first character
489 immediately, then replace it later. So that C-s a with
490 input method latin-1-postfix would immediately search for an a.
492 ** Give start-process the ability to direct standard-error
493 output to a different filter.
495 ** Give desktop.el a feature to switch between different named desktops.
497 ** Add a cpio mode, more or less like tar mode.
499 ** Save undo information in special temporary files, and reload it
500 when needed for undoing. This could extend undo capacity.
501 undo-tree, in ELPA, already does this; its saving code could be
502 integrated without requiring the use of undo-tree.
504 ** Change the Windows NT menu code
505 so that it handles the deep_p argument and avoids
506 regenerating the whole menu bar menu tree except
507 when the user tries to use the menubar.
509 This requires the RIT to forward the WM_INITMENU message to
510 the main thread, and not return from that message until the main
511 thread has processed the MENU_BAR_ACTIVATE_EVENT and regenerated
512 the whole menu bar. In the mean time, it should process other messages.
514 ** Get some major packages installed: W3 (development version needs
515 significant work), PSGML, _possibly_ ECB.
517 Check the assignments file for other packages which might go in and
518 have been missed.
520 ** Make compiler warnings about functions that might be undefined at run time
521 smarter, so that they know which files are required by the file being
522 compiled and don't warn about functions defined in them.
524 ** Split out parts of lisp.h.
526 ** Update the FAQ.
528 ** Allow auto-compression-mode to use zlib calls if zlib is available.
529 [It's required for PNG, so may be linked anyhow.]
531 ** Improve the GC (generational, incremental). (We may be able to use
532 the Boehm collector.) [See the Boehm-GC branch in CVS for work on this.]
534 ** Check what hooks would help Emacspeak -- see the defadvising in W3.
536 ** Add definitions for symbol properties, for documentation purposes.
538 ** Temporarily remove scroll bars when they are not needed, typically
539 when a buffer can be fully displayed in its window.
541 ** Provide an optional feature which computes a scroll bar slider's
542 size and its position from lines instead of characters.
544 ** Allow unknown image types to be rendered via an external program
545 converting them to, say, PBM (in the same way as PostScript?). [does
546 doc-view.el do this, or could it be extended to do this?
547 Does ImageMagick obsolete this idea?]
549 ** Allow displaying an X window from an external program in a buffer,
550 e.g. to render graphics from Java applets. [gerd and/or wmperry
551 thought this was feasible.]
553 ** Allow images (not just text) in the margin to be mouse-sensitive.
554 (Requires recursing through display properties). Provide some way
555 to simulate mouse-clicks on marginal text without a mouse.
557 ** Extend ps-print to deal with multiple font sizes, images, and extra
560 ** Use the XIE X extension, if available, for image display.
562 ** Make monochrome images display using the foreground and background
563 colors of the applicable faces.
565 ** Make 'format-time-string' preserve text properties like 'format'.
567 ** Optionally make the cursor a little thinner at the end of a line
568 or the end of the buffer.
570 ** Port the conservative stack marking code of Emacs's garbage collector
571 to more systems, so that we can completely get rid of GCPROs. Note
572 that Boehm garbage collector provides this.
574 ** Reorder defcustom's in each package so that the more important
575 options come first in the Customize buffers. This could be done by
576 either rearranging the file (since options are shown in the order
577 they appear in the *.el files), or by adding a few :set-after attributes.
579 ** Maybe document the features of libraries missing from the manual (or
580 ancillary manuals, including the Lisp manual in some cases).
581 This is not worth doing for all of these packages and we need not
582 aim for completeness, but some may be worth documenting.
584 Here's a list which is probably not complete/correct: align, allout,
585 artist, ansi-color, array, calculator, cdl, cmuscheme,
586 completion, delim-col, dirtrack, double, echistory, elide-head,
587 easymenu, expand, flow-ctrl, format [format-alist],
588 generic/generic-x [various modes], kermit, log-edit,
589 makesum, midnight [other than in Kill Buffer node],
590 mouse-copy [?], mouse-drag, mouse-sel, net-utils, rcompile,
591 snmp-mode [?], soundex [should be interactive?], strokes [start from
592 the web page], talk, thingatpt [interactive functions?], type-break,
593 vcursor, xscheme, zone-mode [?], mlconvert [?], iso-cvt,
594 feedmail [?], uce, gametree, page-ext,
595 refbib, refer, scribe, texinfo, underline,
596 cmacexp, hideif, mantemp [obsolete?], pcomplete, xml,
597 cvs-status (should be described in PCL-CVS manual); other progmodes,
598 probably in separate manual.
600 ** Convert the XPM bitmaps to PPM, replace the PBMs with them and scrap
601 the XPMs so that the color versions work generally. (Requires care
602 with the color used for the transparent regions.)
604 ** Convenient access to the 'values' variable. It would be nice to have an
605 interface that would show you the printed reps of the elements of the
606 list in a menu, let you select one of the values, and put it into some
607 other variable, without changing the value of 'values'.
609 ** (Controlled by a flag) make open and close syntax match exactly,
610 i.e. '(' doesn't match ']'.
612 ** Specify parameter ID-FORMAT in all calls to 'file-attributes' and
613 'directory-files-and-attributes' where attributes UID or GID are used.
614 Whenever possible, use value 'string.
615 When done, change meaning of default value from 'integer to 'string.
616 If value 'integer is used nowhere, remove the parameter ID-FORMAT from
617 the definition of 'file-attributes' and 'directory-files-and-attributes'
618 and from the calls.
620 ** Make language-info-alist customizable. Currently a user can customize
621 only the variable 'current-language-environment'.
623 ** Improve language environment handling so that Emacs can fit
624 better to a users locale. Currently Emacs uses utf-8 language
625 environment for all utf-8 locales, thus a user in ja_JP.UTF-8 locale
626 are also put in utf-8 lang. env. In such a case, it is
627 better to use Japanese lang. env. but prefer utf-8 coding system.
629 ** Enhance locale handling: handle language, territory and charset
630 orthogonally and de-emphasize language environments. Use the locale
631 to set up more things, such as fontsets, the default Ispell
632 dictionary, diary format, calendar holidays and display, quoting
633 characters and phrase boundaries, sentence endings, collation for
634 sorting (at least for unicodes), HTTP Accept-language, patterns for
635 directory listings and compilation messages, yes-or-no replies,
636 common menu items when the toolkit supports it ... 'locale-info'
637 needs extending for LC_COLLATE &c. [fx started on this.]
639 ** Eliminate the current restriction on header printing by ps-print.
640 Currently, a header can contain only single 1-byte charset in
641 addition to ASCII.
643 ** In ps-print, provide an user friendly interface to specify fonts.
645 ** Enhance word boundary detection for such a script that doesn't use
646 space at word boundary (e.g. Thai).
648 ** Implement interface programs with major Japanese conversion server
649 in lib-src so that they can be used from the input method
650 "japanese". Currently, most Japanese users are using external
651 packages (e.g. tamago, anthy) or an input method via XIM.
653 ** Let LEIM handle the Mode_switch key like XIM does (i.e. a toggle like C-\
654 but which can also be used as a modifier).
656 ** Improve Help buffers: Change the face of previously visited links (like
657 Info, but also with regard to namespace), and give the value of
658 lisp expressions, e.g auto-mode-alist, the right face.
660 ** Possibly make 'list-holidays' eval items in the calendar-holidays variable.
661 See thread
663 [email@example.com will look at this after 22.1]
665 ** Possibly make cal-dst use the system timezone database directly.
666 See thread
669 ** Possibly add a "close" button to the modeline.
670 The idea is to add an "X" of some kind, that when clicked deletes
671 the window associated with that modeline.
674 * Things to be done for specific packages or features
676 ** NeXTstep port
678 *** Missing features
680 This sections contains features found in other official Emacs ports.
682 **** Support for xwidgets
684 Emacs 25 has support for xwidgets, a system to include operating
685 system components into an Emacs buffer. The components range from
686 simple buttons to webkit (effectively, a web browser).
688 Currently, xwidgets works only for the gtk+ framework but it is
689 designed to be compatible with multiple Emacs ports.
691 **** Respect 'frame-inhibit-implied-resize'
693 When the variable 'frame-inhibit-implied-resize' is non-nil, frames
694 should not be resized when operations like changing font or toggling
695 the tool bar is performed.
697 Unfortunately, the tool bar (and possible other operations) always
698 resize the frame.
700 **** Support 'proced' (implement 'process-attributes')
702 Unfortunately, a user-level process like Emacs does not have the
703 privileges to get information about other processes under macOS.
705 There are other ways to do this:
707 1) Spawn "ps" and parse the output ("ps" has superuser privileges).
709 2) Sign Emacs as part of the distribution process.
711 3) Ask the user to self-sign Emacs, if this feature is of interest.
713 Anders Lindgren <firstname.lastname@example.org> has implemented
714 'process-attributes' for macOS, which currently only work when
715 running Emacs as root.
717 See this article by Bozhidar Batsov for an overview of Proced:
720 **** Tooltip properties
722 Tooltip properties like the background color and font are hard-wired,
723 even though Emacs allows a user to customize such features.
725 *** New features
727 This section contains features unique to Nextstep and/or macOS.
729 **** PressAndHold for writing accented character
731 On macOS, many application support the press and hold pattern to
732 invoke a menu of accented characters. (See example at
733 https://support.apple.com/en-us/HT201586 .)
735 Currently, this doesn't work in Emacs.
737 Note that "ns-win.el" explicitly disables this.
739 Note: This feature might not be allowed to be implemented until also
740 implemented in Emacs for a free system.
742 **** Floating scroll bars
744 In modern macOS applications, the scroll bar often floats over the
745 content, and is invisible unless actually used. This makes the user
746 interface less cluttered and more area could be used to contain text.
748 With floating scroll bars, the user interface would look like it does
749 when they are disabled today. However, they will be made visible when
750 a scroll action is initiated, e.g. by putting two fingers on a
753 Note: This feature might not be allowed to be implemented until also
754 implemented in Emacs for a free system.
756 *** Features from the "mac" port
758 This section contains features available in the "mac" Emacs port.
760 As the "mac" port (as of this writing) isn't an official Emacs port,
761 it might contain features not following the FSF rule "must exist on
762 free systems".
764 The "mac" port is based on the Emacs 22 C-based Carbon interface.
765 It has been maintained in parallel to the official Cocoa-based NS
766 interface. The Carbon interface has been enhanced, and a number of the
767 features of that interface could be implemented NS.
769 **** Smooth scrolling -- maybe not a good idea
771 Today, by default, scrolling with a trackpad makes the text move in
772 steps of five lines. (Scrolling with SHIFT scrolls one line at a time.)
774 The "mac" port provides smooth, pixel-based, scrolling. This is a very
775 popular features. However, there are drawbacks to this method: what
776 happens if only a fraction of a line is visible at the top of a
777 window, is the partially visible text considered part of the window or
778 not? (Technically, what should 'window-start' return.)
780 An alternative would be to make one-line scrolling the default on NS
781 (or in Emacs in general).
783 Note: This feature might not be allowed to be implemented until also
784 implemented in Emacs for a free system.
786 **** Mouse gestures
788 The "mac" port defines the gestures 'swipe-left/right/up/down',
789 'magnify-up/down', and 'rotate-left/right'.
791 It also binds the magnification commands to change the font
792 size. (This should be not be done in a specific interface, instead
793 Emacs should do this binding globally.)
795 Note: This feature might not be allowed to be implemented until also
796 implemented in Emacs for a free system.
798 **** Synthesize bold fonts
800 *** Open issues
802 This section contains issues where there is an ongoing debate.
804 **** Key bindings of CMD and ALT
806 Currently in the "ns" port, ALT is bound to Meta and CMD is bound to
807 Super -- allowing the user to use typical macOS commands like CMD-A to
808 mark everything.
810 Unfortunately, when using an international keyboard, you can't type
811 normal characters like "(" etc.
813 There are many alternative key bindings. One solution is to bind CMD
814 to Meta and pass ALT to the system. In fact, this is what Emacs did up
815 to, and including, version 22. Also, this is how the "mac" port binds
816 the keys.
818 One could envision asymmetrical variants as well, however, this is
819 inappropriate for the default setting.
821 See the discussion on emacs-devel:
825 *** Internal development features
827 **** Regression test system (or at least a checklist)
829 Today, after each change to the user interface, Emacs must be manually
830 tested. Often, small details are overlooked ("Oh, I didn't test
831 toggling the tool-bar in one of the full screen modes, when multiple
832 frame were open -- silly me.")
834 It would be an enormous help if this could be tested automatically.
835 Many features are generic, however, the NS interface provides a number
836 of unique features.
838 **** Existing packages
840 Note that there is a generic UI test named frame-test.el, see
841 http://debbugs.gnu.org/21415#284 .
842 The NS interface passes this, with the exception of two toolbar-related errors.
844 **** Anders frame test
846 Anders Lindgren <email@example.com> has implemented some (very basic)
847 tests for full screen, toolbar, and auto-hiding the menu bar.
849 **** Make sure all build variants work
851 Emacs can be build in a number of different ways. For each feature,
852 consider if is really is "NS" specific, or if it should be applied to
853 all build versions.
855 - With the "NS" interface. This is the normal way to build Emacs on
858 - With the "X11" interface. On macOS, this is mainly of interest to
859 developers of Emacs to get a "reference" interface implementations.
860 However, it might be of interest for people working remotely, as X11
861 applications can be used over a network connection.
863 - Console only.
865 *** Bugs
867 **** Incorrect translation of Super modifier with Ctrl or Meta on macOS
869 When pressing 'M-s-a', Emacs replies "M-s-å is undefined". What
870 happened is a mix of Emacs view that Meta and Super has been pressed,
871 and macOS view that ALT-a should yield "å" (U+00E5 LATIN SMALL LETTER
872 A WITH RING ABOVE).
874 The bug reports suggest two different patches; unfortunately, neither
875 works properly. For example:
877 Use a Swedish keyboard layout
879 (setq ns-alternate-modifier nil)
883 Today, this correctly yields that s-] is undefined. With either
884 of the two patches, Emacs responds that s-9 was pressed.
886 More investigation is needed to fix this problem.
889 - http://debbugs.gnu.org/19977
890 - http://debbugs.gnu.org/21330
891 - http://debbugs.gnu.org/21551
893 **** Toggling the toolbar in fullheight or maximized modes
895 The toolbar, in the NS interface, is not considered part of the text
896 area. When it is toggled, the Emacs frame change height accordingly.
898 Unfortunately, this also occurs when the frame is in fullheight or
899 maximized modes (N.B. this is not the same as "fullscreen"). The
900 effect is that the full frame size either increases (stretching down
901 below the lower edge of the screen) or decreases (leaving space
902 between the lower edge of the frame and the lower edge of the screen).
904 A better solution would be for the frame to retain its size,
905 i.e. change the text area.
907 This is related to the 'frame-inhibit-implied-resize' issue.
909 **** The event loop does not redraw.
910 A problem is that redraw don't happen during resize,
911 because we can't break out from the NSapp loop during resize.
912 There was a special trick to detect mouse press in the lower right
913 corner and track mouse movements, but this did not work well, and was
914 not scalable to the new Lion "resize on every window edge" behavior.
915 [As of trunk r109635, 2012-08-15, the event loop no longer polls.]
917 **** (mouse-avoidance-mode 'banish) then minimize Emacs, will pop window back
918 up on top of all others (probably fixed in bug#17439)
920 **** free_frame_resources, face colors
922 **** Numeric keysetting bug.
924 *** Mac-related
926 **** Open file:/// URLs.
928 **** Put frame autopositioning into C code somewhere -- if loc = same, offset.
930 **** Automap ctrl-mouse-1 to mouse-3.
932 **** Deal with Finder aliases somehow.
934 **** Ctrl-F2 won't pull up menus.
936 *** Other / Low Priority:
938 **** Better recognition of Unicode scripts / Greek / composition.
940 **** Undo for color-drag face customization.
942 ** Bidirectional editing
944 *** Support reordering structured text
945 Two important use cases: (1) comments and strings in program sources,
946 and (2) text with markup, like HTML or XML.
948 One idea is to invent a special text property that would instruct the
949 display engine to reorder only the parts of buffer text covered by
950 that property. The display engine will then push its state onto the
951 iterator stack, restrict the bidi iterator to accessing only the
952 portion of buffer text covered by the property, reorder the text, then
953 pop its state from stack and continue as usual. This will require
954 minor changes in the bidi_it structure.
956 This design requires Lisp-level code to put the text properties on the
957 relevant parts of the buffer text. That could be done using JIT
958 fontifications, or as a preliminary processing when the file is
959 visited. With HTML/XML, the code that puts text properties needs to
960 pay attention to the bidi directives embedded in the HTML/XML stream.
962 *** Allow the user to control the direction of the UI
964 **** Introduce user option to control direction of mode line.
965 One problem is the header line, which is produced by the same routines
966 as the mode line. While it makes sense to have the mode-line
967 direction controlled by a single global variable, header lines are
968 buffer-specific, so they need a separate treatment in this regard.
970 **** User options to control direction of menu bar and tool bar.
971 For the tool bar, it's relatively easy: set it.paragraph_embedding
972 in redisplay_tool_bar according to the user variable, and make
973 f->desired_tool_bar_string multibyte with STRING_SET_MULTIBYTE. Some
974 minor changes will be needed to set the right_box_line_p and
975 left_box_line_p flags correctly for the R2L tool bar.
977 However, it makes no sense to display the tool bar right to left if
978 the menu bar cannot be displayed in the same direction.
980 R2L menu bar is tricky for the same reasons as the mode line. In
981 addition, toolkit builds create their menu bars in toolkit-specific
982 parts of code, bypassing xdisp.c, so those parts need to be enhanced
983 with toolkit-specific code to display the menu bar right to left.
985 ** ImageMagick support
987 *** image-type-header-regexps priorities the jpeg loader over the
988 ImageMagick one. This is not wrong, but how should a user go about
989 preferring the ImageMagick loader? The user might like zooming etc in jpegs.
991 Try (setq image-type-header-regexps nil) for a quick hack to prefer
992 ImageMagick over the jpg loader.
994 *** For some reason it's unbearably slow to look at a page in a large
995 image bundle using the :index feature. The ImageMagick "display"
996 command is also a bit slow, but nowhere near as slow as the Emacs
997 code. It seems ImageMagick tries to unpack every page when loading the
998 bundle. This feature is not the primary usecase in Emacs though.
1000 ImageMagick 6.6.2-9 introduced a bugfix for single page djvu load. It
1001 is now much faster to use the :index feature, but still not very fast.
1003 *** Try to cache the num pages calculation. It can take a while to
1004 calculate the number of pages, and if you need to do it for each page
1005 view, page-flipping becomes uselessly slow.
1007 *** Integrate with image-dired.
1009 *** Integrate with docview.
1011 *** Integrate with image-mode.
1012 Some work has been done, e.g. M-x image-transform-fit-to-height will
1013 fit the image to the height of the Emacs window.
1015 *** Look for optimizations for handling images with low depth.
1016 Currently the code seems to default to 24 bit RGB which is costly for
1017 images with lower bit depth.
1019 *** Decide what to do with some uncommitted imagemagick support
1020 functions for image size etc.
1022 ** nxml mode
1024 *** High priority
1026 **** Command to insert an element template, including all required
1027 attributes and child elements. When there's a choice of elements
1028 possible, we could insert a comment, and put an overlay on that
1029 comment that makes it behave like a button with a pop-up menu to
1030 select the appropriate choice.
1032 **** Command to tag a region. With a schema should complete using legal
1033 tags, but should work without a schema as well.
1035 **** Provide a way to conveniently rename an element. With a schema should
1036 complete using legal tags, but should work without a schema as well.
1038 *** Outlining
1040 **** Implement C-c C-o C-q.
1042 **** Install pre/post command hook for moving out of invisible section.
1044 **** Put a modify hook on invisible sections that expands them.
1046 **** Integrate dumb folding somehow.
1048 **** An element should be able to be its own heading.
1050 **** Optimize to avoid complete buffer scan on each command.
1052 **** Make it work with HTML-style headings (i.e. level indicated by
1053 name of heading element rather than depth of section nesting).
1055 **** Recognize root element as a section provided it has a title, even
1056 if it doesn't match section-element-name-regex.
1058 **** Support for incremental search automatically making hidden text visible.
1060 **** Allow title to be an attribute.
1062 **** Command that says to recognize the tag at point as a section/heading.
1064 **** Explore better ways to determine when an element is a section
1065 or a heading.
1067 **** rng-next-error needs to either ignore invisible portion or reveal it
1068 (maybe use isearch oriented text properties).
1070 **** Errors within hidden section should be highlighted by underlining the
1073 **** Make indirect buffers work.
1075 **** How should nxml-refresh outline recover from non well-formed tags?
1077 **** Hide tags in title elements?
1079 **** Use overlays instead of text properties for holding outline state?
1080 Necessary for indirect buffers to work?
1082 **** Allow an outline to go in the speedbar.
1084 **** Split up outlining manual section into subsections.
1086 **** More detail in the manual about each outlining command.
1088 **** More menu entries for hiding/showing?
1090 **** Indication of many lines have been hidden?
1092 *** Locating schemas
1094 **** Should rng-validate-mode give the user an opportunity to specify a
1095 schema if there is currently none? Or should it at least give a hint
1096 to the user how to specify a non-vacuous schema?
1098 **** Support for adding new schemas to schema-locating files.
1099 Add documentElement and namespace elements.
1101 **** C-c C-w should be able to report current type id.
1103 **** Implement doctypePublicId.
1105 **** Implement typeIdBase.
1107 **** Implement typeIdProcessingInstruction.
1109 **** Support xml:base.
1111 **** Implement group.
1113 **** Find preferred prefix from schema-locating files. Get rid of
1116 **** Inserting document element with vacuous schema should complete using
1117 document elements declared in schema locating files, and set schema
1120 **** Add a ruleType attribute to the <include> element?
1122 **** Allow processing instruction in prolog to contain the compact syntax
1123 schema directly.
1125 **** Use RDDL to locate a schema based on the namespace URI.
1127 **** Should not prompt to add redundant association to schema locating file.
1129 **** Command to reload current schema.
1131 *** Schema-sensitive features
1133 **** Should filter dynamic markup possibilities using schema validity, by
1134 adding hook to nxml-mode.
1136 **** Dynamic markup word should (at least optionally) be able to look in
1137 other buffers that are using nxml-mode.
1139 **** Should clicking on Invalid move to next error if already on an error?
1141 **** Take advantage of a:documentation. Needs change to schema format.
1143 **** Provide feasible validation (as in Jing) toggle.
1145 **** Save the validation state as a property on the error overlay to enable
1146 more detailed diagnosis.
1148 **** Provide an Error Summary buffer showing all the validation errors.
1150 **** Pop-up menu. What is useful? Tag a region (should be grayed out if
1151 the region is not balanced). Suggestions based on error messages.
1153 **** Have configurable list of namespace URIs so that we can provide
1154 namespace URI completion on extension elements or with schema-less documents.
1156 **** Allow validation to handle XInclude.
1158 **** ID/IDREF support.
1160 *** Completion
1162 **** Make it work with icomplete. Only use a function to complete when
1163 some of the possible names have undeclared namespaces.
1165 **** How should C-return in mixed text work?
1167 **** When there's a vacuous schema, C-return after < will insert the end-tag.
1168 Is this a bug or a feature?
1170 **** After completing start-tag, ensure we don't get unhelpful message
1171 from validation
1173 **** Syntax table for completion.
1175 **** Should complete start-tag name with a space if namespace attributes
1176 are required.
1178 **** When completing start-tag name with no prefix and it doesn't match
1179 should try to infer namespace from local name.
1181 **** Should completion pay attention to characters after point? If so, how?
1183 **** When completing start-tag name, add required atts if only one required
1186 **** When completing attribute name, add attribute value if only one value
1187 is possible.
1189 **** After attribute-value completion, insert space after close delimiter
1190 if more attributes are required.
1192 **** Complete on enumerated data values in elements.
1194 **** When in context that allows only elements, should get tag
1195 completion without having to type < first.
1197 **** When immediately after start-tag name, and name is valid and not
1198 prefix of any other name, should C-return complete on attribute names?
1200 **** When completing attributes, more consistent to ignore all attributes
1201 after point.
1203 **** Inserting attribute value completions needs to be sensitive to what
1204 delimiter is used so that it quotes the correct character.
1206 **** Complete on encoding-names in XML decl.
1208 **** Complete namespace declarations by searching for all namespaces
1209 mentioned in the schema.
1211 *** Well-formed XML support
1213 **** Deal better with Mule-UCS
1215 **** Deal with UTF-8 BOM when reading.
1217 **** Complete entity names.
1219 **** Provide some support for entity names for MathML.
1221 **** Command to repeat the last tag.
1223 **** Support for changing between character references and characters.
1224 Need to check that context is one in which character references are
1225 allowed. xmltok prolog parsing will need to distinguish parameter
1226 literals from other kinds of literal.
1228 **** Provide a comment command to bind to M-; that works better than the
1229 normal one.
1231 **** Make indenting in a multi-line comment work.
1233 **** Structure view. Separate buffer displaying element tree.
1234 Be able to navigate from structure view to document and vice-versa.
1236 **** Flash matching >.
1238 **** Smart selection command that selects increasingly large syntactically
1239 coherent chunks of XML. If point is in an attribute value, first
1240 select complete value; then if command is repeated, select value plus
1241 delimiters, then select attribute name as well, then complete
1242 start-tag, then complete element, then enclosing element, etc.
1244 **** ispell integration.
1246 **** Block-level items in mixed content should be indented, e.g:
1247 <para>This is list:
1251 **** Provide option to indent like this:
1252 <para>This is a paragraph
1253 occupying multiple lines.</para>
1255 **** Option to add make a / that closes a start-tag electrically insert a
1256 space for the XHTML guys.
1258 **** C-M-q should work.
1260 *** Datatypes
1262 **** Figure out workaround for CJK characters with regexps.
1264 **** Does category C contain Cn?
1266 **** Do ENTITY datatype properly.
1268 *** XML Parsing Library
1270 **** Parameter entity parsing option, nil (never), t (always),
1271 unless-standalone (unless standalone="yes" in XML declaration).
1273 **** When a file is currently being edited, there should be an option to
1274 use its buffer instead of the on-disk copy.
1276 *** Handling all XML features
1278 **** Provide better support for editing external general parsed entities.
1279 Perhaps provide a way to force ignoring undefined entities; maybe turn
1280 this on automatically with <?xml encoding=""?> (with no version
1283 **** Handle internal general entity declarations containing elements.
1285 **** Handle external general entity declarations.
1287 **** Handle default attribute declarations in internal subset.
1289 **** Handle parameter entities (including DTD).
1291 *** RELAX NG
1293 **** Do complete schema checking, at least optionally.
1295 **** Detect include/external loops during schema parse.
1297 **** Coding system detection for schemas. Should use utf-8/utf-16 per the
1298 spec. But also need to allow encodings other than UTF-8/16 to support
1299 CJK charsets that Emacs cannot represent in Unicode.
1301 *** Catching XML errors
1303 **** Check public identifiers.
1305 **** Check default attribute values.
1307 *** Performance
1309 **** Explore whether overlay-recenter can cure overlays performance problems.
1311 **** Cache schemas. Need to have list of files and mtimes.
1313 **** Make it possible to reduce rng-validate-chunk-size significantly,
1314 perhaps to 500 bytes, without bad performance impact: don't do
1315 redisplay on every chunk; pass continue functions on other uses of
1318 **** Cache after first tag.
1320 **** Introduce a new name class that is a choice between names (so that
1321 we can use member)
1323 **** intern-choice should simplify after patterns with same 1st/2nd args
1325 **** Large numbers of overlays slow things down dramatically. Represent
1326 errors using text properties. This implies we cannot incrementally
1327 keep track of the number of errors, in order to determine validity.
1328 Instead, when validation completes, scan for any characters with an
1329 error text property; this seems to be fast enough even with large
1330 buffers. Problem with error at end of buffer, where there's no
1331 character; need special variable for this. Need to merge face from
1332 font-lock with the error face: use :inherit attribute with list of two
1333 faces. How do we avoid making rng-valid depend on nxml-mode?
1335 *** Error recovery
1337 **** Don't stop at newline in looking for close of start-tag.
1339 **** Use indentation to guide recovery from mismatched end-tags
1341 **** Don't keep parsing when currently not well-formed but previously
1344 **** Try to recover from a bad start-tag by popping an open element if
1345 there was a mismatched end-tag unaccounted for.
1347 **** Try to recover from a bad start-tag open on the hypothesis that there
1348 was an error in the namespace URI.
1350 **** Better recovery from ill-formed XML declarations.
1352 *** Usability improvements
1354 **** Should print a "Parsing..." message during long movements.
1356 **** Provide better position for reference to undefined pattern error.
1358 **** Put Well-formed in the mode-line when validating against any-content.
1360 **** Trim marking of illegal data for leading and trailing whitespace.
1362 **** Show Invalid status as soon as we are sure it's invalid, rather than
1363 waiting for everything to be completely up to date.
1365 **** When narrowed, Valid or Invalid status should probably consider only
1366 validity of narrowed region.
1368 *** Bug fixes
1370 **** Need to give an error for a document like: <foo/><![CDATA[ ]]>
1372 **** Make nxml-forward-balanced-item work better for the prolog.
1374 **** Make filling and indenting comments work in the prolog.
1376 **** Should delete RNC Input buffers.
1378 **** Figure out what regex use for NCName and use it consistently,
1380 **** Should have not-well-formed tokens in ref.
1382 **** Require version in XML declaration? Probably not because prevents
1383 use for external parsed entities. At least forbid standalone without version.
1385 **** Reject schema that compiles to rng-not-allowed-ipattern.
1387 **** Move point backwards on schema parse error so that it's on the right token.
1389 *** Internal
1391 **** Use rng-quote-string consistently.
1393 **** Use parsing library for XML to texinfo conversion.
1395 **** Rename xmltok.el to nxml-token.el. Use nxml-t- prefix instead of
1396 xmltok-. Change nxml-t-type to nxml-t-token-type, nxml-t-start to
1399 **** Can we set fill-prefix to nil and rely on indenting?
1401 **** xmltok should make available replacement text of entities containing
1404 **** In rng-valid, instead of using modification-hooks and
1405 insert-behind-hooks on dependent overlays, use same technique as nxml-mode.
1407 *** Fontification
1409 **** Allow face to depend on element qname, attribute qname, attribute
1410 value. Use list with pairs of (R . F), where R specifies regexps and
1411 F specifies faces. How can this list be made to depend on the document type?
1413 *** Other
1415 **** Support RELAX NG XML syntax (use XML parsing library).
1417 **** Support W3C XML Schema (use XML parsing library).
1419 **** Command to infer schema from current document (like trang).
1421 *** Schemas
1423 **** XSLT schema should take advantage of RELAX NG to express cooccurrence
1424 constraints on attributes (e.g. xsl:template).
1426 *** Documentation
1428 **** Move material from README to manual.
1430 **** Document encodings.
1432 *** Notes
1434 **** How can we allow an error to be displayed on a different token from
1435 where it is detected? In particular, for a missing closing ">" we
1436 will need to display it at the beginning of the following token. At the
1437 moment, when we parse the following token the error overlay will get cleared.
1439 **** How should rng-goto-next-error deal with narrowing?
1441 **** Perhaps should merge errors having same start position even if they
1442 have different ends.
1444 **** How to handle surrogates? One possibility is to be compatible with
1445 utf8.e: represent as sequence of 4 chars. But utf-16 is incompatible
1446 with this.
1448 **** Should we distinguish well-formedness errors from invalidity errors?
1449 (I think not: we may want to recover from a bad start-tag by implying
1450 an end-tag.)
1452 **** Seems to be a bug with Emacs, where a mouse movement that causes
1453 help-echo text to appear counts as pending input but does not cause
1454 idle timer to be restarted.
1456 **** Use XML to represent this file.
1458 **** I had a TODO which said simply "split-string". What did I mean?
1460 **** Investigate performance on large files all on one line.
1462 *** Issues for Emacs versions >= 22
1464 **** Take advantage of UTF-8 CJK support.
1466 **** Supply a next-error-function.
1468 **** Investigate this NEWS item "Emacs now tries to set up buffer coding
1469 systems for HTML/XML files automatically."
1471 **** Take advantage of the pointer text property.
1473 **** Leverage char-displayable-p.
1475 ** RefTeX
1477 *** Provide a wdired-like mode for editing RefTeX TOC buffers.
1478 As a first step, renaming of sections could be supported. Ultimately,
1479 it would be great if it also supported moving sections, e.g., by
1480 killing and yanking or providing org-mode like "move section
1481 upwards/downwards" commands. However, that's not so easy in the
1482 presence of multi-file documents.
1484 * Internal changes
1486 ** Cleanup all the GC_ mark bit stuff -- there is no longer any distinction
1487 since the mark bit is no longer stored in the Lisp_Object itself.
1489 ** Refine the 'predicate' arg to read-file-name.
1490 Currently, it mixes up the predicate to apply when doing completion and the
1491 one to use when terminating the selection.
1493 ** Merge ibuffer.el and buff-menu.el.
1494 More specifically do what's needed to make ibuffer.el the default,
1495 or just an extension of buff-menu.el.
1497 ** Replace linum.el with nlinum.el
1500 ** Merge sendmail.el and messages.el.
1501 Probably not a complete merge, but at least arrange for messages.el to be
1502 a derived mode of sendmail.el. Or arrange for messages.el to be split
1503 into a small core and "the rest" so that we use less resources as long as
1504 we stick to the features provided in sendmail.el.
1506 ** Replace gmalloc.c with the modified Doug Lea code from the current
1507 GNU libc so that the special mmapping of buffers can be removed --
1508 that apparently loses under Solaris, at least. [fx has mostly done
1511 ** Rewrite make-docfile to be clean and maintainable.
1512 It might be better to replace it with Lisp, using the byte compiler.
1515 ** Add an inferior-comint-minor-mode to capture the common set of operations
1516 offered by major modes that offer an associated inferior
1517 comint-derived mode. I.e. basically make cmuscheme.el/inf-lisp.el generic.
1518 For use by sml-mode, python-mode, tex-mode, scheme-mode, lisp-mode,
1519 haskell-mode, tuareg-mode, ...
1521 ** Add "link" button class
1522 Add a standard button-class named "link", and make all other link-like
1523 button classes inherit from it. Set the default face of the "link" button
1524 class to the standard "link" face.
1526 * Wishlist items:
1528 ** Maybe replace etags.c with a Lisp implementation.
1531 ** Maybe replace lib-src/rcs2log with a Lisp implementation.
1532 It wouldn't have to be a complete replacement, just enough
1533 for vc-rcs-update-changelog.
1535 * Other known bugs:
1537 ** 'make-frame' forgets unhandled parameters, at least for X11 frames.
1539 ** a two-char comment-starter whose two chars are symbol constituents will
1540 not be noticed if it appears within a word.
1543 This file is part of GNU Emacs.
1545 GNU Emacs is free software: you can redistribute it and/or modify
1546 it under the terms of the GNU General Public License as published by
1547 the Free Software Foundation, either version 3 of the License, or
1548 (at your option) any later version.
1550 GNU Emacs is distributed in the hope that it will be useful,
1551 but WITHOUT ANY WARRANTY; without even the implied warranty of
1552 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1553 GNU General Public License for more details.
1555 You should have received a copy of the GNU General Public License
1556 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1558 ;; Local Variables:
1559 ;; coding: utf-8
1560 ;; End: