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1 GNU Emacs NEWS -- history of user-visible changes.
2
3 Copyright (C) 2010-2013 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
5
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
8
9 This file is about changes in Emacs version 24.
10
11 See files NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
12 and NEWS.1-17 for changes in older Emacs versions.
13
14 You can narrow news to a specific version by calling `view-emacs-news'
15 with a prefix argument or by typing C-u C-h C-n.
16
17 Temporary note:
18 +++ indicates that the appropriate manual has already been updated.
19 --- means no change in the manuals is called for.
20 When you add a new item, please add it without either +++ or ---
21 so we will look at it and add it to the manual.
22
23 \f
24 * Installation Changes in Emacs 24.4
25
26 ** Emacs can be compiled with POSIX ACL support.
27 This happens by default if a suitable support library is found at
28 build time, like libacl on GNU/Linux. To prevent this, use the
29 configure option `--without-acl'.
30
31 ** The configure option --with-crt-dir has been removed.
32 It is no longer needed, as the crt*.o files are no longer linked specially.
33
34 \f
35 * Startup Changes in Emacs 24.4
36
37 \f
38 * Changes in Emacs 24.4
39
40 +++
41 ** `apropos-variable' is now `apropos-user-option'
42 `apropos-user-option' shows all user options while `apropos-variable'
43 shows all variables. When called with a universal prefix argument,
44 the two commands swap their behaviors. When `apropos-do-all' is
45 non-nil, they output the same results.
46
47 +++
48 ** `eval-defun' on an already defined defcustom calls the :set function,
49 if there is one.
50
51 ** If the new variable `enable-dir-local-variables' is nil,
52 directory local variables are ignored. May be useful for some modes
53 that want to ignore directory-locals while still respecting file-locals.
54
55 ** The option `set-mark-default-inactive' has been deleted.
56 This unfinished feature was introduced by accident in Emacs 23.1;
57 simply disabling Transient Mark mode does the same thing.
58
59 ** `initial-buffer-choice' can now specify a function to set up the
60 initial buffer.
61
62 ** ACL support has been added.
63 +++
64 *** Emacs preserves the ACL entries of files when backing up.
65 +++
66 *** New functions `file-acl' and `set-file-acl' get and set the ACL
67 entries of a file. On GNU/Linux, the POSIX ACL interface is used via
68 libacl. On MS-Windows, the NT Security APIs are used to emulate the
69 POSIX ACL interfaces.
70
71 ** New option `scroll-bar-adjust-thumb-portion'.
72 Available only on X, this option allows to control over-scrolling
73 using the scroll bar (i.e. dragging the thumb down even when the end
74 of the buffer is visible).
75
76 \f
77 * Editing Changes in Emacs 24.4
78
79 ** New commands `toggle-frame-fullscreen' and `toggle-frame-maximized',
80 bound to <f11> and M-<f10>, respectively.
81
82 ** In keymaps where SPC scrolls, S-SPC now scrolls in the reverse direction.
83 Eg View mode, etc.
84
85 \f
86 * Changes in Specialized Modes and Packages in Emacs 24.4
87
88 ** Delphi mode is now called OPascal mode.
89 *** All delphi-* variables and functions have been renamed to opascal-*.
90 *** `delphi-newline-always-indents' is not supported any more
91 use `electric-indent-mode' instead.
92 *** `delphi-tab' is gone, replaced by `indent-for-tab-command'.
93
94 ** jit-lock-debug-mode lets you use the debuggers on code run via jit-lock.
95
96 ** completing-read-multiple's separator can now be a regexp.
97 The default separator is changed to allow surrounding spaces around the comma.
98
99 ** Battery
100
101 *** Battery information via the BSD `apm' utility is now supported.
102
103 ** cl-lib
104
105 *** New macro cl-tagbody.
106
107 +++
108 *** letf is now just an alias for cl-letf.
109
110 ** Calc
111
112 *** Calc by default now uses the Gregorian calendar for all dates, and
113 uses January 1, 1 AD as its day number 1. Previously Calc used the
114 Julian calendar for dates before September 14, 1752, and it used
115 December 31, 1 BC as its day number 1; the new scheme is more
116 consistent with Calendar's calendrical system and day numbering.
117
118 *** The new variable `calc-gregorian-switch' lets you configure the
119 date when Calc switches from the Julian to the Gregorian calendar.
120 Nil, the default value, means to always use the Gregorian calendar.
121 The value (YEAR MONTH DAY) means to start using the Gregorian calendar
122 on the given date.
123
124 *** Support for ISO 8601 dates.
125
126 ** Dired
127
128 *** New minor mode `dired-hide-details-mode' hides details.
129
130 ** ERC
131
132 *** New option `erc-accidental-paste-threshold-seconds'.
133 If set to a number, this can be used to avoid accidentally paste large
134 amounts of data into the ERC input.
135
136 ** Icomplete is a bit more like IDO.
137 *** key bindings to navigate through and select the completions.
138 *** The icomplete-separator is customizable, and its default has changed.
139 *** Removed icomplete-show-key-bindings.
140
141 ** Image mode
142
143 *** New commands `n' (`image-next-file') and `p' (`image-previous-file')
144 visit the next image file and the previous image file in the same
145 directory, respectively.
146
147 *** New commands to show specific frames of multi-frame images.
148 `f' (`image-next-frame') and `b' (`image-previous-frame') visit the
149 next or previous frame. `F' (`image-goto-frame') shows a specific frame.
150
151 ---
152 *** The command `image-mode-fit-frame' deletes other windows.
153 When toggling, it restores the frame's previous window configuration.
154 It also has an optional frame argument, which can be used by Lisp
155 callers to fit the image to a frame other than the selected frame.
156
157 ** Isearch
158
159 *** `C-x 8 RET' in Isearch mode reads a character by its Unicode name
160 and adds it to the search string.
161
162 ** MH-E has been updated to MH-E version 8.4.
163 See MH-E-NEWS for details.
164
165 ---
166 ** The unrmail command converts from BABYL to mboxrd rather than mboxo.
167 Customize `unrmail-mbox-format' to change this.
168
169 ---
170 ** Similarly, customize `rmail-mbox-format' to influence some minor aspects
171 of how Rmail displays non-MIME messages.
172
173 +++
174 ** New function `ses-rename-cell' to give SES cells arbitrary names.
175
176 ** trace-function was largely rewritten.
177 New features include:
178 - no prompting for the destination buffer, unless a prefix-arg was used.
179 - additionally to prompting for a destination buffer, when a prefix-arg is
180 used, the user can enter a "context", i.e. Lisp expression whose value at the
181 time the function is entered/exited will be printed along with the function
182 name and arguments. Useful to trace the value of (current-buffer) or
183 (point) when the function is invoked.
184
185 ** New command `delete-duplicate-lines' has two types of operation:
186 when its arg ADJACENT is non-nil (when called interactively with C-u C-u)
187 it works like the utility `uniq'. Otherwise by default it deletes
188 duplicate lines everywhere in the region without regard to adjacency.
189
190 ** New `cycle-spacing' command allows cycling between having just one
191 space, no spaces, or reverting to the original spacing. Like
192 `just-one-space' command it can handle or ignore newlines and
193 leave different number of spaces.
194
195 ** Tramp
196
197 +++
198 *** New connection method "adb", which allows to access Android
199 devices by the Android Debug Bridge. The variable `tramp-adb-program'
200 can be used to adapt the path of the "adb" program, if needed.
201
202 *** The connection methods "plink1", "ssh1", "ssh2", "scp1", "scp2",
203 "scpc" and "rsyncc" are discontinued. The ssh option
204 "ControlMaster=auto" is set automatically in all ssh-based methods,
205 when possible.
206
207 +++
208 *** Handlers for `file-acl' and `set-file-acl' for remote machines
209 which support POSIX ACLs.
210
211 ** Woman
212
213 *** The commands `woman-default-faces' and `woman-monochrome-faces'
214 are obsolete. Customize the `woman-* faces instead.
215
216 ** Obsolete packages:
217
218 *** longlines.el is obsolete; use visual-line-mode instead.
219
220 *** terminal.el is obsolete; use term.el instead.
221
222 +++
223 *** yow.el is obsolete; use fortune.el or cookie1.el instead.
224
225 ---
226 *** The Info-edit command is obsolete. Editing Info nodes by hand
227 has not been relevant for some time.
228
229 \f
230 * New Modes and Packages in Emacs 24.4
231 ** New nadvice.el package offering lighter-weight advice facilities.
232 It is layered as:
233 - add-function/remove-function which can be used to add/remove code on any
234 function-carrying place, such as process-filters or `<foo>-function' hooks.
235 - advice-add/advice-remove to add/remove a piece of advice on a named function,
236 much like `defadvice' does.
237
238 \f
239 * Incompatible Lisp Changes in Emacs 24.4
240
241 ** Removed inhibit-local-menu-bar-menus.
242
243 ** frame-local variables that affect redisplay do not work any more.
244 More specifically, the redisplay does not bother to check for a frame-local
245 value when looking up variables.
246
247 ** nil and "unbound" are indistinguishable in symbol-function.
248 `symbol-function' never signals `void-function' any more.
249 `fboundp' returns non-nil if the symbol was `fset' to nil.
250
251 ** `defadvice' does not honor the `freeze' flag and cannot advise
252 special-forms any more.
253
254 ** `dolist' in lexical-binding mode does not bind VAR in RESULT any more.
255 VAR was bound to nil which was not tremendously useful and just lead to
256 spurious warnings about an unused var.
257
258 ** The return value of `backup-buffer' has changed.
259 The second argument is no longer an SELinux context, instead it is an
260 alist of extended attributes as returned by the new function
261 `file-extended-attributes'. The attributes can be applied to another
262 file using `set-file-extended-attributes'.
263
264 \f
265 * Lisp Changes in Emacs 24.4
266
267 ** Support for filesystem notifications.
268 Emacs now supports notifications of filesystem changes, such as
269 creation, modification, and deletion of files. This requires the
270 'inotify' API on GNU/Linux systems. On MS-Windows systems, this is
271 supported for Windows XP and newer versions.
272
273 ** Changes in autorevert.el
274
275 ---
276 *** If Emacs is compiled with file notification support, notifications
277 are used instead of checking the time stamp of the files. You can
278 disable this by setting the user option `auto-revert-use-notify' to
279 nil. Alternatively, a regular expression of directories to be
280 excluded from file notifications can be specified by
281 `auto-revert-notify-exclude-dir-regexp'.
282
283 ---
284 *** The new user option `auto-revert-remote-files' enables reversion
285 of remote files when set to non-nil.
286
287 ** Face changes
288
289 *** The `face-spec-set' is now analogous to `setq' for face specs.
290 Its third arg now accepts values specifying exactly which face spec to
291 set (defface, custom, or user spec), and it directly sets the relevant
292 property using the supplied face spec.
293
294 *** Face specs set via Custom themes now replace the `defface' spec
295 rather than inheriting from it (as do face specs set via Customize).
296
297 *** New face characteristic (supports :underline (:style wave))
298 specifies whether or not the terminal can display a wavy line.
299
300 ** Image API
301
302 +++
303 *** `image-animated-p' is now `image-multi-frame-p'.
304 It returns non-nil for any image that contains multiple frames,
305 whether or not it specifies a frame delay.
306
307 +++
308 *** When animating images that do not specify a frame delay,
309 Emacs uses `image-default-frame-delay'.
310
311 +++
312 *** New functions `image-current-frame' and `image-show-frame' for getting
313 and setting the current frame of a multi-frame image.
314
315 ** time-to-seconds is not obsolete any more.
316 ** New function special-form-p.
317 ** Docstrings can be made dynamic by adding a `dynamic-docstring-function'
318 text-property on the first char.
319
320 ** The `defalias-fset-function' property lets you catch calls to defalias
321 and redirect them to your own function instead of `fset'.
322
323 ** The 9th element returned by `file-attributes' is now unspecified.
324 Formerly, it was t if the file's gid would change if file were deleted
325 and recreated. This value has been inaccurate for years on many
326 platforms, and nobody seems to have noticed or cared.
327
328 ** The function `file-ownership-preserved-p' now has an optional
329 argument GROUP which causes it check for file group too. This can be
330 used in place of the 9th element of `file-attributes'.
331
332 ** New functions `group-gid' and `group-real-gid'.
333
334 ** The 6th argument to `copy-file' has been renamed to
335 `preserve-extended-attributes' as it now handles both SELinux context
336 and ACL entries.
337
338 \f
339 * Changes in Emacs 24.4 on Non-Free Operating Systems
340
341 +++
342 ** The "generate a backtrace on fatal error" feature now works on MS Windows.
343 The backtrace is written to the 'emacs_backtrace.txt' file in the
344 directory where Emacs was running.
345
346 +++
347 ** The variable `buffer-file-type' is no longer supported.
348 Setting it has no effect, and %t in the mode-line format is ignored.
349 Likewise, `file-name-buffer-file-type-alist' is now obsolete, and
350 modifying it has no effect.
351
352 ---
353 ** Lock files now work on MS-Windows.
354 This allows to avoid losing your edits if the same file is being
355 edited in another Emacs session or by another user. See the node
356 "Interlocking" in the Emacs User Manual for the details. To disable
357 file locking, customize `create-lockfiles' to nil.
358
359 ** Improved fullscreen support on Mac OS X.
360 Both native (>= OSX 10.7) and "old style" fullscreen are supported.
361 Customize `ns-use-native-fullscreen' to change style. For >= 10.7
362 native is the default.
363
364 \f
365 * Installation Changes in Emacs 24.3
366
367 ** The default X toolkit is now Gtk+ version 3.
368 If you don't pass `--with-x-toolkit' to configure, or if you use
369 `--with-x-toolkit=gtk' or `--with-x-toolkit=yes', configure will try
370 to build with Gtk+ version 3, and if that fails, try Gtk+ version 2.
371 You can explicitly require a specific version by passing
372 `--with-x-toolkit=gtk2' or `--with-x-toolkit=gtk3' to configure.
373
374 ** New configure option `--enable-link-time-optimization', to utilize
375 an appropriate feature provided by GCC since version 4.5.0.
376
377 ** New configure option `--without-all' to disable most of the optional
378 features (image support, etc.) that are normally enabled by default.
379
380 ** New configure option `--enable-gcc-warnings' (for developing/debugging
381 Emacs). If building with GCC, this enables compile-time checks that
382 warn/give errors about possibly-questionable C code. On a recent GNU
383 system there should be no warnings; on older and on non-GNU systems
384 the results may be useful to developers.
385
386 ** The configure option `--enable-use-lisp-union-type' has been
387 renamed to `--enable-check-lisp-object-type', as the resulting
388 Lisp_Object type no longer uses a union to implement the compile time
389 check that this option enables.
390
391 ** The configure option `--disable-maintainer-mode' has been removed,
392 as it was confusingly-named and rarely useful.
393
394 ** The configure options `--program-prefix', `--program-suffix', and
395 `--program-transform-name' apply to more than just the installed
396 binaries. Now they also affect the man pages, icons, and the
397 etc/emacs.desktop file; but not the info pages, since this would break
398 links between the various manuals.
399
400 ** You can use `NO_BIN_LINK=t make install' to prevent the installation
401 overwriting "emacs" in the installation bin/ directory with a link
402 to "emacs-VERSION".
403
404 ** Emacs uses libtinfo in preference to libncurses, if available.
405
406 ** On FreeBSD and NetBSD, configure no longer adds /usr/local/lib and
407 /usr/pkg/lib to the linker search path. You must add them yourself if
408 you want them.
409
410 ** The standalone scripts `rcs-checkin' and `vcdiff' have been removed
411 (from the bin and libexec directories, respectively). The former is
412 no longer relevant, the latter is replaced by lisp (in vc-sccs.el).
413
414 \f
415 * Startup Changes in Emacs 24.3
416
417 ** Emacs no longer searches for `leim-list.el' files beneath the standard
418 lisp/ directory. There should not be any there anyway. If you have
419 been adding them there, put them somewhere else; e.g., site-lisp.
420
421 ** The `--no-site-lisp' command line option now works for Nextstep builds.
422
423 \f
424 * Changes in Emacs 24.3
425
426 ** Help
427
428 *** `C-h f' (`describe-function') can now perform autoloading.
429 When this command is called for an autoloaded function whose docstring
430 contains a key substitution construct, that function's library is
431 automatically loaded, so that the documentation can be shown
432 correctly. To disable this, set `help-enable-auto-load' to nil.
433
434 *** `C-h f' now reports previously-autoloaded functions as "autoloaded",
435 even after their associated libraries have been loaded (and the
436 autoloads have been redefined as functions).
437
438 ** ImageMagick
439
440 *** Images displayed via ImageMagick now support transparency and the
441 :background image specification property.
442
443 *** When available, ImageMagick support is automatically enabled.
444 It is no longer necessary to call `imagemagick-register-types'
445 explicitly to install ImageMagick image types; that function is called
446 automatically at startup, or when customizing an imagemagick- option.
447
448 *** Setting `imagemagick-types-inhibit' to t now disables the use of
449 ImageMagick to view images. (You must call `imagemagick-register-types'
450 afterwards if you do not use customize to change this.)
451
452 *** The new variable `imagemagick-enabled-types' also affects which
453 ImageMagick types are treated as images. The function
454 `imagemagick-filter-types' returns the list of types that will be
455 treated as images.
456
457 ** Minibuffer
458
459 *** In minibuffer filename prompts, `C-M-f' and `C-M-b' now move to the
460 next and previous path separator, respectively.
461
462 *** `minibuffer-electric-default-mode' can shorten "(default ...)" to "[...]"
463 in minibuffer prompts. Just set `minibuffer-eldef-shorten-default'
464 non-nil before enabling the mode.
465
466 ** Mode line
467
468 *** New option `mode-line-default-help-echo' specifies the help text
469 (shown in a tooltip or in the echo area) for any part of the mode line
470 that does not have its own specialized help text.
471
472 *** You can now click mouse-3 in the coding system indicator to invoke
473 `set-buffer-file-coding-system'.
474
475 ** Server and client
476
477 *** emacsclient now obeys string values for `initial-buffer-choice',
478 if it is told to open a new frame without specifying any file to visit
479 or expression to evaluate.
480
481 *** New option `server-auth-key' specifies a shared server key.
482
483 ** Emacs now generates backtraces on fatal errors.
484 On encountering a fatal error, Emacs now outputs a textual description
485 of the fatal signal, and a short backtrace on platforms like glibc
486 that support backtraces.
487
488 ** `C-x C-q' is now bound to the new minor mode `read-only-mode'.
489 This minor mode replaces `toggle-read-only', which is now obsolete.
490
491 ** Most `y-or-n' prompts now allow you to scroll the selected window.
492 Typing `C-v' or `M-v' at a y-or-n prompt scrolls forward or backward
493 respectively, without exiting from the prompt.
494
495 ** In the Package Menu, newly-available packages are listed as "new",
496 and sorted above the other "available" packages by default.
497
498 ** If your Emacs was built from a bzr checkout, the new variable
499 `emacs-bzr-version' contains information about the bzr revision used.
500
501 ** New option `create-lockfiles' specifies usage of lockfiles.
502 It defaults to t. Changing it to nil inhibits the creation of lock
503 files (use this with caution).
504
505 ** New option `enable-remote-dir-locals', if non-nil, allows directory-local
506 variables on remote hosts.
507
508 ** The entry for PCL-CVS has been removed from the Tools menu.
509 The PCL-CVS commands are still available via the keyboard.
510
511 ** Using "unibyte: t" in Lisp source files is obsolete.
512 Use "coding: raw-text" instead.
513
514 ** In the buffer made by `M-x report-emacs-bug', the `C-c m' binding
515 has been changed to `C-c M-i' (`report-emacs-bug-insert-to-mailer').
516 The previous binding, introduced in Emacs 24.1, was a mistake, because
517 `C-c LETTER' bindings are reserved for user customizations.
518
519 ** Internationalization
520
521 *** New language environment: Persian.
522
523 *** New input method `vietnamese-vni'.
524
525 ** Nextstep (GNUstep / Mac OS X) port
526
527 *** Support for fullscreen and the frame parameter fullscreen.
528
529 *** A file dialog is used for open/save operations initiated from the
530 menu/toolbar.
531
532 \f
533 * Editing Changes in Emacs 24.3
534
535 ** Search and Replace
536
537 *** Non-regexp Isearch now performs "lax" space matching.
538 Each sequence of spaces in the supplied search string may match any
539 sequence of one or more whitespace characters, as specified by the
540 variable `search-whitespace-regexp'. (This variable is also used by a
541 similar existing feature for regexp Isearch.)
542
543 *** New Isearch command `M-s SPC' toggles lax space matching.
544 This applies to both ordinary and regexp Isearch.
545
546 *** New option `replace-lax-whitespace'.
547 If non-nil, `query-replace' uses flexible whitespace matching too.
548 The default is nil.
549
550 *** Global `M-s _' starts a symbol (identifier) incremental search,
551 and `M-s _' in Isearch toggles symbol search mode.
552 `M-s c' in Isearch toggles search case-sensitivity.
553
554 ** Navigation commands
555
556 *** New binding `M-g c' for `goto-char'.
557
558 *** New binding `M-g TAB' for `move-to-column'.
559
560 *** `M-g TAB' (`move-to-column') prompts for a column number if called
561 interactively with no prefix arg. Previously, it moved to column 1.
562
563 ** New option `yank-handled-properties' allows processing of text
564 properties on yanked text, in ways that are more general than just
565 removing them (as is done by `yank-excluded-properties').
566
567 ** New option `delete-trailing-lines' specifies whether
568 M-x delete-trailing-whitespace should delete trailing lines at the end
569 of the buffer. It defaults to t.
570
571 ** `C-u M-=' now counts lines/words/characters in the entire buffer.
572
573 ** `C-x 8 RET' is now bound to `insert-char', which is now a command.
574 `ucs-insert' is now an obsolete alias for `insert-char'.
575
576 ** The `z' key no longer has a binding in most special modes.
577 It used to be bound to `kill-this-buffer', but `z' is too easy to
578 accidentally type.
579
580 ** New command `C-x r M-w' (`copy-rectangle-as-kill').
581 It copies the region-rectangle as the last rectangle kill.
582
583 ** Registers
584
585 *** `C-x r +' is now overloaded to invoke `append-to-register'.
586
587 *** New option `register-separator' specifies the register containing
588 the text to put between collected texts for use with
589 M-x append-to-register and M-x prepend-to-register.
590
591 \f
592 * Changes in Specialized Modes and Packages in Emacs 24.3
593
594 ** Common Lisp emulation (CL)
595
596 *** CL's main entry is now (require 'cl-lib).
597 `cl-lib' is like the old `cl' except that it uses the namespace cleanly;
598 i.e., all its definitions have the "cl-" prefix (and internal definitions
599 use the "cl--" prefix).
600
601 If `cl' provided a feature under the name `foo', then `cl-lib'
602 provides it under the name `cl-foo' instead; with the exceptions of the
603 few `cl' definitions that had to use `foo*' to avoid conflicts with
604 pre-existing Elisp entities. These have been renamed to `cl-foo'
605 rather than `cl-foo*'.
606
607 The old `cl' is now deprecated and is mainly just a bunch of aliases that
608 provide the old, non-prefixed names. Some exceptions are listed below:
609
610 *** `cl-flet' is not like `flet' (which is deprecated).
611 Instead it obeys the behavior of Common-Lisp's `flet'.
612 In particular, in cl-flet function definitions are lexically scoped,
613 whereas in flet the scoping is dynamic.
614
615 *** `cl-labels' is slightly different from `labels'.
616 The difference is that it relies on the `lexical-binding' machinery
617 (as opposed to the `lexical-let' machinery used previously) to capture
618 definitions in closures, so such closures will only work if `lexical-binding'
619 is in use.
620
621 *** `cl-letf' is not exactly like `letf'.
622 The only difference is in details that relate to some deprecated usage
623 of `symbol-function' in place forms.
624
625 *** `progv' was rewritten to use the `let' machinery.
626 A side effect is that variables without corresponding values are bound
627 to nil rather than being made unbound.
628
629 *** The following methods of extending `setf' are obsolete
630 (use features from gv.el instead):
631 `define-modify-macro' (use `gv-letplace')
632 `defsetf' (use `gv-define-simple-setter' or `gv-define-setter')
633 `define-setf-expander' (use `gv-define-setter' or `gv-define-expander')
634 `get-setf-method' no longer exists (see "Incompatible Lisp Changes")
635
636 ** Diff mode
637
638 *** Changes are now highlighted using the same color scheme as in
639 modern VCSes. Deletions are displayed in red (new faces
640 `diff-refine-removed' and `smerge-refined-removed', and new definition
641 of `diff-removed'), insertions in green (new faces `diff-refine-added'
642 and `smerge-refined-added', and new definition of `diff-added').
643
644 *** The variable `diff-use-changed-face' defines whether to use the
645 face `diff-changed', or `diff-removed' and `diff-added' to highlight
646 changes in context diffs.
647
648 *** The new command `diff-delete-trailing-whitespace' removes trailing
649 whitespace introduced by a diff.
650
651 ** Ediff now uses the same color scheme as Diff mode.
652
653 ** Python mode
654
655 A new version of python.el, which provides several new features, including:
656 per-buffer shells, better indentation, Python 3 support, and improved
657 shell-interaction compatible with iPython (and virtually any other
658 text based shell).
659
660 *** Some user options have been replaced/renamed, including (old -> new):
661 **** python-indent -> python-indent-offset
662 **** python-guess-indent -> python-indent-guess-indent-offset
663 **** python-pdbtrack-do-tracking-p -> python-pdbtrack-activate
664 **** python-use-skeletons -> python-skeleton-autoinsert
665
666 *** Some user options have been removed, including:
667
668 **** `python-indent-string-contents': Strings are never indented.
669
670 **** `python-honour-comment-indentation':
671 Comments are always considered as indentation markers.
672
673 **** `python-continuation-offset': Indentation is automatically
674 calculated in a pep8 compliant way depending on the context.
675
676 **** `python-shell-prompt-alist', `python-shell-continuation-prompt-alist':
677 Have no direct mapping as the shell interaction is completely different.
678
679 **** `python-python-command', `python-jython-command':
680 Replaced by `python-shell-interpreter'.
681
682 **** `inferior-python-filter-regexp', `python-remove-cwd-from-path',
683 `python-pdbtrack-minor-mode-string', `python-source-modes':
684 No longer relevant.
685
686 *** Some commands have been replaced (old -> new):
687 **** python-insert-class -> python-skeleton-class
688 **** python-insert-def -> python-skeleton-def
689 **** python-insert-for -> python-skeleton-for
690 **** python-insert-if -> python-skeleton-if
691 **** python-insert-try/except -> python-skeleton-try
692 **** python-insert-try/finally -> python-skeleton-try
693 **** python-insert-while -> python-skeleton-while
694 **** python-find-function -> python-nav-jump-to-defun
695 **** python-next-statement -> python-nav-forward-sentence
696 **** python-previous-statement -> python-nav-backward-sentence
697 **** python-beginning-of-defun-function -> python-nav-beginning-of-defun
698 **** python-end-of-defun-function -> python-nav-end-of-defun
699 **** python-send-buffer -> python-shell-send-buffer
700 **** python-send-defun -> python-shell-send-defun
701 **** python-send-region -> python-shell-send-region
702 **** python-send-region-and-go -> emulate with python-shell-send-region
703 and python-shell-switch-to-shell
704 **** python-send-string -> python-shell-send-string
705 **** python-switch-to-python -> python-shell-switch-to-shell
706 **** python-describe-symbol -> python-eldoc-at-point
707
708 ** D-Bus
709
710 *** New variables `dbus-compiled-version' and `dbus-runtime-version'.
711
712 *** The D-Bus object manager interface is implemented.
713
714 *** Variables of type :(u)int32 and :(u)int64 accept floating points,
715 if their value does not fit into Emacs's integer range.
716
717 *** The function `dbus-call-method' is now non-blocking.
718 It can be interrupted by `C-g'. `dbus-call-method-non-blocking' is obsolete.
719
720 *** Signals can also be sent as unicast messages.
721
722 *** The argument list of `dbus-register-signal' has been extended,
723 according to the new match rule types of D-Bus.
724
725 *** `dbus-init-bus' supports private connections.
726
727 *** There is a new function `dbus-setenv'.
728
729 ** `desktop-path' no longer includes the "." directory.
730 Desktop files are now located in ~/.emacs.d by default.
731
732 ** Dired
733
734 *** `dired-do-async-shell-command' executes each file sequentially
735 if the command ends in `;' (when operating on multiple files).
736 Otherwise, it executes the command on each file in parallel.
737
738 *** Typing `M-n' in the minibuffer of `dired-do-chmod', `dired-do-chgrp',
739 `dired-do-chown', and `dired-do-touch' yanks the attributes of the
740 file at point.
741
742 *** When the region is active, `m' (`dired-mark'), `u' (`dired-unmark'),
743 `DEL' (`dired-unmark-backward'), and `d' (`dired-flag-file-deletion')
744 mark/unmark/flag all files in the active region.
745
746 *** The minibuffer default for `=' (`dired-diff) has changed.
747 It is now the backup file for the file at point, if one exists.
748 In Transient Mark mode the default is the file at the active mark.
749
750 *** `M-=' is no longer bound to `dired-backup-diff' in Dired buffers.
751 The global binding for `M-=', `count-words-region' is in effect.
752
753 ** ERC
754
755 *** New module "notifications", which can send a notification when you
756 receive a private message or your nickname is mentioned.
757
758 *** ERC will look up server/channel names via auth-source and use any
759 channel keys found.
760
761 *** New option `erc-lurker-hide-list', similar to `erc-hide-list', but
762 only applies to messages sent by lurkers.
763
764 ** reStructuredText mode
765
766 *** Keybindings (see `C-c C-h'), TAB indentation, filling and auto-filling,
767 fontification, comment handling, and customization have all been revised
768 and improved.
769
770 *** Support for `imenu' and `which-function-mode'.
771
772 *** The reStructuredText syntax is more closely covered.
773 Sphinx support has been improved.
774
775 *** `rst-insert-list' inserts new list or continues existing lists.
776
777 *** A negative prefix argument always works for `rst-adjust'.
778
779 *** The window configuration is reset after displaying a TOC.
780
781 *** The constant `rst-version' describes the rst.el package version.
782
783 ** Ruby mode
784
785 *** Support for percent literals and recognition of regular expressions
786 in method calls without parentheses with more methods, including Cucumber
787 steps definitions.
788
789 *** Improved syntax highlighting and indentation.
790
791 *** New command `ruby-toggle-block', bound to `C-c {'.
792
793 *** Some non-standard keybindings/commands have been removed:
794
795 **** `ruby-electric-brace'; use `electric-indent-mode' instead.
796
797 **** `ruby-mark-defun'; use `mark-defun'.
798
799 **** `ruby-beginning-of-defun' and `ruby-end-of-defun' are replaced by
800 appropriate settings for the variables `beginning-of-defun-function'
801 and `end-of-defun-function'.
802
803 **** Non-standard keybindings for `backward-kill-word', `comment-region',
804 `reindent-then-newline-and-indent' and `newline' have been removed.
805
806 ** Shell Script mode
807
808 *** Pairing of parens/quotes uses `electric-pair-mode' instead of skeleton-pair.
809
810 *** `sh-electric-here-document-mode' now controls auto-insertion of here-docs.
811
812 *** `sh-use-smie' lets you choose a new indentation and navigation code.
813
814 ** VHDL mode
815
816 *** The free software compiler GHDL is supported (and now the default).
817
818 *** Support for the VHDL-AMS packages has been added/updated.
819
820 *** Updated to the 2002 revision of the VHDL standard.
821
822 *** Accepts \r and \f as whitespace.
823
824 ** Apropos
825
826 *** The faces used by Apropos are now directly customizable.
827 These faces are named `apropos-symbol', `apropos-keybinding', and so on;
828 see the `apropos' Custom group for details.
829
830 *** The old options whose values specified faces to use have been removed
831 (i.e. `apropos-symbol-face', `apropos-keybinding-face', etc.).
832
833 ** Buffer Menu
834
835 *** This package has been rewritten to use Tabulated List mode.
836
837 *** Option `Buffer-menu-buffer+size-width' is now obsolete.
838 Use `Buffer-menu-name-width' and `Buffer-menu-size-width' instead.
839
840 ** Calc
841
842 *** Algebraic simplification mode is now the default.
843 To restrict to the limited simplifications given by the former
844 default simplification mode, use `m I'.
845
846 ** Calendar
847
848 *** You can customize the header text that appears above each calendar month.
849 See the variable `calendar-month-header'.
850
851 *** New LaTeX calendar style, produced by `cal-tex-cursor-week2-summary'.
852
853 *** The calendars produced by cal-html include holidays.
854 Customize `cal-html-holidays' to change this.
855
856 ** CEDET
857
858 *** The major modes from the parser generators "Bovine" and "Wisent"
859 are now properly integrated in Emacs. The file suffixes ".by" and ".wy"
860 are in `auto-mode-alist', and the corresponding manuals are included.
861
862 *** EDE
863
864 **** Menu support for the "Configuration" feature. This allows users to
865 choose the active configuration (such as debug or install) from the menu.
866
867 **** New command `ede-set' to interactively set project-local variables.
868
869 **** Support for compiling, debugging, and running in "generic" projects.
870
871 **** Autoconf editing support for M4 macros with complex arguments.
872
873 **** Compilation support for the "linux" project type.
874
875 **** "simple" projects have been removed; use "generic" projects instead.
876
877 *** Semantic
878
879 **** Support for parsing #include statements inside a namespace in C/C++.
880
881 **** Improved support for 'extern "C"' declarations in C/C++.
882
883 **** The ability to ignore more common special C/C++ preprocessor symbols,
884 such as '__nonnull' and '__asm'. Add '__cplusplus' macro when parsing C++.
885 If available, include cdefs.h as an additional source of preprocessor symbols.
886
887 **** Improved C/C++ function pointer parsing.
888
889 **** In Python, support for converting imports to include file names.
890
891 **** Ability to dynamically determine the Python load path.
892
893 **** Support for the Python 'WITH' and 'AT' keywords.
894
895 **** Improved tooltip completion.
896
897 *** SRecode
898
899 **** The SRecode manual is now included.
900
901 **** Tag generation supports constructor/destructor settings and system
902 include differentiation.
903
904 **** Addition of 'Framework' support: Frameworks are specified when a
905 particular kind of library (such as Android) is needed in a common language
906 mode (like Java).
907
908 **** Support for nested templates and let variables override based on priority.
909
910 **** Support for merging tables from multiple related modes, such as
911 default -> c++ -> arduino.
912
913 ** Compile has a new option `compilation-always-kill'.
914
915 ** Customize
916
917 *** `custom-reset-button-menu' now defaults to t.
918
919 *** Non-option variables are never matched in `customize-apropos' and
920 `customize-apropos-options' (i.e., the prefix argument does nothing for
921 these commands now).
922
923 ** Term
924
925 *** The variables `term-default-fg-color' and `term-default-bg-color'
926 are now deprecated in favor of the customizable face `term'.
927
928 *** You can customize how to display ANSI terminal colors and styles
929 by customizing the corresponding `term-color-<COLOR>',
930 `term-color-underline' and `term-color-bold' faces.
931
932 ** Tramp
933
934 *** The syntax has been extended in order to allow ad-hoc proxy definitions.
935
936 *** Remote processes are now also supported on remote MS-Windows hosts.
937
938 ** URL
939
940 *** Structs made by `url-generic-parse-url' have nil `attributes' slot.
941 Previously, this slot stored semicolon-separated attribute-value pairs
942 appended to some imap URLs, but this is not compatible with RFC 3986.
943 So now the `filename' slot stores the entire path and query components,
944 and the `attributes' slot is always nil.
945
946 *** New function `url-encode-url' for encoding a URI string.
947 The `url-retrieve' function now uses this to encode its URL argument,
948 in case that is not properly encoded.
949
950 ** notifications.el supports now version 1.2 of the Notifications API.
951 The function `notifications-get-capabilities' returns the supported
952 server properties.
953
954 ** Flymake uses fringe bitmaps to indicate errors and warnings.
955 See `flymake-fringe-indicator-position', `flymake-error-bitmap' and
956 `flymake-warning-bitmap'.
957
958 ** The FFAP option `ffap-url-unwrap-remote' can now be a list of strings,
959 specifying URL types that should be converted to remote file names at
960 the FFAP prompt. The default is now '("ftp").
961
962 ** New Ibuffer `derived-mode' filter, bound to `/ M'.
963 The old binding for `/ M' (filter by used-mode) is now bound to `/ m'.
964
965 ** New option `mouse-avoidance-banish-position' specifies where the
966 `banish' mouse avoidance setting moves the mouse.
967
968 ** In Perl mode, new option `perl-indent-parens-as-block' causes non-block
969 closing brackets to be aligned with the line of the opening bracket.
970
971 ** In Proced mode, new command `proced-renice' renices marked processes.
972
973 ** New option `async-shell-command-buffer' specifies the buffer to use
974 for a new asynchronous `shell-command' when the default output buffer
975 `*Async Shell Command*' is already in use.
976
977 ** SQL mode has a new option `sql-db2-escape-newlines'.
978 If non-nil, newlines sent to the command interpreter will be escaped
979 by a backslash. The default does not escape the newlines and assumes
980 that the sql statement will be terminated by a semicolon.
981
982 ** New command `tabulated-list-sort', bound to `S' in Tabulated List mode
983 (and modes that derive from it), sorts the column at point, or the Nth
984 column if a numeric prefix argument is given.
985
986 ** `which-func-modes' now defaults to t, so Which Function mode, when
987 enabled, applies to all applicable major modes.
988
989 ** `winner-mode-hook' now runs when the mode is disabled, as well as when
990 it is enabled.
991
992 ** Follow mode no longer works by using advice.
993 The option `follow-intercept-processes' has been removed.
994
995 ** `javascript-generic-mode' is now an obsolete alias for `js-mode'.
996
997 ** Hooks renamed to avoid obsolete "-hooks" suffix:
998 *** semantic-lex-reset-hooks -> semantic-lex-reset-functions
999 *** semantic-change-hooks -> semantic-change-functions
1000 *** semantic-edits-new-change-hooks -> semantic-edits-new-change-functions
1001 *** semantic-edits-delete-change-hooks -> semantic-edits-delete-change-functions
1002 *** semantic-edits-reparse-change-hooks -> semantic-edits-reparse-change-functions
1003 *** semanticdb-save-database-hooks -> semanticdb-save-database-functions
1004 *** c-prepare-bug-report-hooks -> c-prepare-bug-report-hook
1005 *** rcirc-sentinel-hooks -> rcirc-sentinel-functions
1006 *** rcirc-receive-message-hooks -> rcirc-receive-message-functions
1007 *** rcirc-activity-hooks -> rcirc-activity-functions
1008 *** rcirc-print-hooks -> rcirc-print-functions
1009 *** dbus-event-error-hooks -> dbus-event-error-functions
1010 *** eieio-pre-method-execution-hooks -> eieio-pre-method-execution-functions
1011 *** checkdoc-style-hooks -> checkdoc-style-functions
1012 *** checkdoc-comment-style-hooks -> checkdoc-comment-style-functions
1013 *** archive-extract-hooks -> archive-extract-hook
1014 *** filesets-cache-fill-content-hooks -> filesets-cache-fill-content-hook
1015 *** hfy-post-html-hooks -> hfy-post-html-hook
1016 *** nndiary-request-create-group-hooks -> nndiary-request-create-group-functions
1017 *** nndiary-request-update-info-hooks -> nndiary-request-update-info-functions
1018 *** nndiary-request-accept-article-hooks -> nndiary-request-accept-article-functions
1019 *** gnus-subscribe-newsgroup-hooks -> gnus-subscribe-newsgroup-functions
1020
1021 ** Obsolete packages
1022
1023 *** assoc.el
1024 In most cases, assoc+member+push+delq work just as well.
1025 And in any case it's just a terrible package: ugly semantics, terrible
1026 inefficiency, and not namespace-clean.
1027 *** bruce.el
1028 *** cust-print.el
1029 *** ledit.el
1030 *** mailpost.el
1031 *** mouse-sel.el
1032 *** patcomp.el
1033
1034 \f
1035 * Incompatible Lisp Changes in Emacs 24.3
1036
1037 ** Docstrings starting with `*' no longer indicate user options.
1038 Only variables defined using `defcustom' are considered user options.
1039 The function `user-variable-p' is now an obsolete alias for
1040 `custom-variable-p'.
1041
1042 ** The return values of `defalias', `defun' and `defmacro' have changed,
1043 and are now undefined. For backwards compatibility, `defun' and
1044 `defmacro' currently return the name of the newly defined
1045 function/macro, but this should not be relied upon.
1046
1047 ** `random' by default now returns a different random sequence in
1048 every Emacs run. Use `(random S)', where S is a string, to set the
1049 random seed to a value based on S, in order to get a repeatable
1050 sequence in later calls.
1051
1052 ** If the NEWTEXT arg to `replace-match' contains a substring "\?",
1053 that substring is inserted literally even if the LITERAL arg is
1054 non-nil, instead of causing an error to be signaled.
1055
1056 ** `select-window' now always makes the window's buffer current.
1057 It does so even if the window was selected before.
1058
1059 ** The function `x-select-font' can return a font spec, instead of a
1060 font name as a string. Whether it returns a font spec or a font name
1061 depends on the graphical library.
1062
1063 ** `face-spec-set' no longer sets frame-specific attributes when the
1064 third argument is a frame (that usage was obsolete since Emacs 22.2).
1065
1066 ** `set-buffer-multibyte' now signals an error in narrowed buffers.
1067
1068 ** The CL package's `get-setf-method' function no longer exists.
1069 Generalized variables are now part of core Emacs Lisp, and implemented
1070 differently to the way cl.el used to do it. It is not possible to
1071 define a compatible replacement for `get-setf-method'. See the file
1072 gv.el for internal details of the new implementation.
1073
1074 ** The arguments of `dbus-register-signal' are no longer just strings,
1075 but keywords or keyword-string pairs. The old argument list will
1076 still be supported for Emacs 24.x.
1077
1078 ** Miscellaneous name changes
1079 Some Lisp symbols have been renamed to correct their spelling,
1080 or to be more consistent with standard Emacs terminology.
1081
1082 *** Renamed functions
1083 **** hangul-input-method-inactivate -> hangul-input-method-deactivate
1084 **** inactivate-input-method -> deactivate-input-method
1085 **** quail-inactivate -> quail-deactivate
1086 **** robin-inactivate -> robin-deactivate
1087 **** viper-inactivate-input-method -> viper-deactivate-input-method
1088 **** viper-inactivate-input-method-action ->
1089 viper-deactivate-input-method-action
1090 **** ucs-input-inactivate -> ucs-input-deactivate
1091
1092 *** Renamed hooks
1093 The old hooks are still supported for backward compatibility, but they
1094 are deprecated and will be removed eventually.
1095 **** input-method-inactivate-hook -> input-method-deactivate-hook
1096 **** robin-inactivate-hook -> robin-deactivate-hook
1097 **** quail-inactivate-hook -> quail-deactivate-hook
1098
1099 *** Renamed variables
1100 **** follow-deactive-menu -> follow-inactive-menu
1101 **** inactivate-current-input-method-function ->
1102 deactivate-current-input-method-function
1103
1104 ** Some obsolete functions, variables, and faces have been removed:
1105 *** `last-input-char', `last-command-char', `unread-command-char'
1106 *** `facemenu-unlisted-faces'
1107 *** `rmail-decode-mime-charset'
1108 *** `iswitchb-read-buffer'
1109 *** `sc-version', `sc-submit-bug-report'
1110 *** `set-char-table-default'
1111 *** `string-to-sequence' (use `string-to-list' or `string-to-vector')
1112 *** `compile-internal'
1113 *** `modeline'
1114 *** `mode-line-inverse-video'
1115 *** `follow-mode-off-hook'
1116 *** `cvs-commit-buffer-require-final-newline'
1117 (use `log-edit-require-final-newline' instead)
1118 *** `cvs-changelog-full-paragraphs'
1119 (use `log-edit-changelog-full-paragraphs' instead)
1120 *** `cvs-diff-ignore-marks', `cvs-diff-buffer-name'
1121 *** `vc-ignore-vc-files' (use `vc-handled-backends' instead)
1122 *** `vc-master-templates' (use `vc-handled-backends' instead)
1123 *** `vc-checkout-carefully'
1124
1125 \f
1126 * Lisp Changes in Emacs 24.3
1127
1128 ** CL-style generalized variables are now in core Elisp.
1129 `setf' is autoloaded; `push' and `pop' accept generalized variables.
1130 You can define your own generalized variables using `gv-define-simple-setter',
1131 `gv-define-setter', etc.
1132
1133 ** Emacs tries to macroexpand interpreted (non-compiled) files during load.
1134 This can significantly speed up execution of non-byte-compiled code,
1135 but can also bump into previously unnoticed cyclic dependencies.
1136 These are generally harmless: they will simply cause the macro calls
1137 to be left for later expansion (as before), but will result in a
1138 warning ("Eager macro-expansion skipped due to cycle") describing the cycle.
1139 You may wish to restructure your code so this does not happen.
1140
1141 ** New sampling-based Elisp profiler.
1142 Try M-x profiler-start, do some work, and then call M-x profiler-report.
1143 When finished, use M-x profiler-stop. The sampling rate can be based on
1144 CPU time or memory allocations.
1145
1146 ** `defun' also accepts a (declare DECLS) form, like `defmacro'.
1147 The interpretation of the DECLS is determined by `defun-declarations-alist'.
1148
1149 ** New macros `setq-local' and `defvar-local'.
1150
1151 ** Face underlining can now use a wave.
1152
1153 ** `read-regexp' has a new argument HISTORY; the first argument PROMPT
1154 of `read-regexp' accepts a string ending with a colon and space, and its
1155 second argument DEFAULTS can be a list of strings accessible via `M-n'
1156 in the minibuffer ahead of other hard-coded useful regexp-related values.
1157 More commands use `read-regexp' now to read their regexp arguments.
1158
1159 ** Completion
1160
1161 *** New function `completion-table-with-quoting' to handle completion
1162 in the presence of quoting, such as file completion in shell buffers.
1163
1164 *** New function `completion-table-subvert' to use an existing completion
1165 table, but with a different prefix.
1166
1167 ** Debugger
1168
1169 *** New error type and new function `user-error'.
1170 These do not trigger the debugger.
1171
1172 *** New option `debugger-bury-or-kill', saying what to do with the
1173 debugger buffer when exiting debug.
1174
1175 *** Set `debug-on-message' to enter the debugger when a certain
1176 message is displayed in the echo area. This can be useful when trying
1177 to work out which code is doing something.
1178
1179 *** New var `inhibit-debugger', automatically set to prevent accidental
1180 recursive invocations.
1181
1182 ** Window handling
1183
1184 *** New command `fit-frame-to-buffer' adjusts the frame height to
1185 fit the contents.
1186
1187 *** The command `fit-window-to-buffer' can adjust the frame height
1188 if the new option `fit-frame-to-buffer' is non-nil.
1189
1190 *** New macro `with-temp-buffer-window', similar to
1191 `with-output-to-temp-buffer'.
1192
1193 *** `temp-buffer-resize-mode' no longer resizes windows that have been
1194 reused.
1195
1196 *** New option `switch-to-buffer-preserve-window-point' to restore a
1197 window's point when switching buffers.
1198
1199 *** New display action alist entries `window-height' and `window-width'
1200 specify the size of new windows created by `display-buffer'.
1201
1202 *** New display action alist entry `pop-up-frame-parameters', if
1203 non-nil, specifies frame parameters to give any newly-created frame.
1204
1205 *** New display action alist entry `inhibit-switch-frame', if non-nil,
1206 tells display action functions to avoid changing which frame is
1207 selected.
1208
1209 *** New display action alist entry `previous-window', if non-nil,
1210 specifies window to reuse in `display-buffer-in-previous-window'.
1211
1212 *** New display action functions `display-buffer-below-selected',
1213 and `display-buffer-in-previous-window'.
1214
1215 *** The functions `get-lru-window', `get-mru-window' and `get-largest-window'
1216 now accept a third argument to avoid choosing the selected window.
1217
1218 *** Additional values recognized for option `window-combination-limit'.
1219
1220 *** The following variables are obsolete, as they can be replaced by
1221 appropriate entries in the `display-buffer-alist' function introduced
1222 in Emacs 24.1:
1223 **** `dired-shrink-to-fit'
1224 **** `display-buffer-reuse-frames'
1225 **** `display-buffer-function'
1226 **** `special-display-buffer-names'
1227 **** `special-display-frame-alist'
1228 **** `special-display-function'
1229 **** `special-display-regexps'
1230
1231 ** Time
1232
1233 *** `current-time-string' no longer requires that its argument's year
1234 must be in the range 1000..9999. It now works with any year supported
1235 by the underlying C implementation.
1236
1237 *** `current-time' now returns extended-format time stamps
1238 (HIGH LOW USEC PSEC), where the new PSEC slot specifies picoseconds.
1239 PSEC is typically a multiple of 1000 on current machines. Other
1240 functions that use this format, such as `file-attributes' and
1241 `format-time-string', have been changed accordingly. Old-format time
1242 stamps are still accepted.
1243
1244 *** The format of timers in `timer-list' and `timer-idle-list' is now
1245 [TRIGGERED-P HI-SECS LO-SECS USECS REPEAT-DELAY FUNCTION ARGS IDLE-DELAY PSECS].
1246 The PSECS slot is new, and uses picosecond resolution. It can be
1247 accessed via the new `timer--psecs' accessor.
1248
1249 *** Last-modified time stamps in undo lists now are of the form
1250 (t HI-SECS LO-SECS USECS PSECS) instead of (t HI-SECS . LO-SECS).
1251
1252 ** EIEIO
1253
1254 *** Improved security when handling persistent objects:
1255
1256 **** `eieio-persistent-read' now features optional arguments for specifying
1257 the class to load, as well as a flag stating whether subclasses are allowed;
1258 if provided, other classes will be rejected by the reader. For
1259 compatibility with existing code, if the class is omitted only a
1260 warning is issued.
1261
1262 **** New specialized reader for pulling in classes and signaling errors
1263 without evaluation of suspicious code.
1264
1265 **** All slots that contain objects must have a :type. Slots with lists
1266 of objects must use a new type predicate for a list of an object type.
1267
1268 *** Support for `find-function' and similar utilities, through the addition
1269 of filename support to generated symbols.
1270
1271 ** Floating point functions now always return special values like NaN,
1272 instead of signaling errors, if given invalid args; e.g., (log -1.0).
1273 Previously, they returned NaNs on some platforms but signaled errors
1274 on others. The affected functions are acos, asin, tan, exp, expt,
1275 log, log10, sqrt, and mod.
1276
1277 ** New fringe bitmap `exclamation-mark'.
1278
1279 ** Miscellaneous changes to special forms and macros
1280
1281 *** `defun' and `defmacro' are now macros rather than special forms.
1282
1283 *** `kbd' is now a function rather than a macro.
1284
1285 ** Miscellaneous new functions
1286
1287 *** `set-temporary-overlay-map' sets up a temporary keymap that
1288 takes precedence over most other maps for a short while (normally one key).
1289
1290 *** `autoloadp' tests if its argument is an autoloaded object.
1291
1292 *** `autoload-do-load' performs the autoloading operation.
1293
1294 *** `buffer-narrowed-p' tests if the buffer is narrowed.
1295
1296 *** `file-name-base' returns a file name sans directory and extension.
1297
1298 *** `function-get' fetches a function property, following aliases.
1299
1300 *** `posnp' tests if an object is a `posn'.
1301
1302 *** `system-users' returns the user names on the system.
1303
1304 *** `system-groups' returns the group names on the system.
1305
1306 *** `tty-top-frame' returns the topmost frame of a text terminal.
1307
1308 ** The following functions and variables are obsolete:
1309 *** `automount-dir-prefix' (use `directory-abbrev-alist')
1310 *** `buffer-has-markers-at'
1311 *** `macro-declaration-function' (use `macro-declarations-alist')
1312 *** `window-system-version' (provides no useful information)
1313 *** `dired-pop-to-buffer' (use `dired-mark-pop-up')
1314 *** `query-replace-interactive'
1315 *** `font-list-limit' (has had no effect since Emacs < 23)
1316
1317 \f
1318 * Changes in Emacs 24.3 on Non-Free Operating Systems
1319
1320 ** Cygwin builds can use the native MS Windows user interface.
1321 Pass `--with-w32' to configure. The default remains the X11 interface.
1322
1323 ** Two new functions are available in Cygwin builds:
1324 `cygwin-convert-file-name-from-windows' and
1325 `cygwin-convert-file-name-to-windows'. These functions allow Lisp
1326 code to access the Cygwin file-name mapping machinery to convert
1327 between Cygwin and Windows-native file and directory names.
1328
1329 ** When invoked with the -nw switch to run on the Windows text-mode terminal,
1330 Emacs now supports `mouse-highlight', help-echo (in the echo area), and
1331 `mouse-autoselect-window'.
1332
1333 ** On MS Windows Vista and later Emacs now supports symbolic links.
1334
1335 ** On MS Windows, you can pass `--without-libxml2' to configure.bat to omit
1336 support for libxml2, even if its presence is detected.
1337
1338 ** On Mac OS X, the Nextstep port requires OS X 10.4 or later.
1339
1340 ** On Mac OS X, configure no longer automatically adds the Fink "/sw"
1341 directories to the search path. You must add them yourself if you want them.
1342
1343 \f
1344 * Changes in Emacs 24.2
1345
1346 ** This is mainly a bug-fix release.
1347
1348 \f
1349 * Installation Changes in Emacs 24.1
1350
1351 ** Emacs can be compiled with Gtk+ 3.0 if you pass --with-x-toolkit=gtk3
1352 to configure. Note that other libraries used by Emacs, RSVG and GConf,
1353 also depend on Gtk+. You can disable them with --without-rsvg and
1354 --without-gconf.
1355
1356 ** Emacs can be compiled with GnuTLS support.
1357 This happens by default if a suitably recent version of the library is
1358 found at build time. To prevent this, use the configure option
1359 `--without-gnutls'. See below for GnuTLS features.
1360
1361 ** Emacs can be compiled with SELinux support.
1362 This happens by default if a suitably recent version of the library is
1363 found at build time. To prevent this, use the configure option
1364 `--without-selinux'. See below for SELinux features.
1365
1366 ** Emacs can be compiled with ImageMagick support.
1367 This happens by default if a suitably recent version of the library is
1368 found at build time. To prevent this, use the configure option
1369 `--without-imagemagick'. See below for ImageMagick features.
1370 This feature is not available for the Nextstep or MS ports.
1371
1372 ** Emacs can be compiled with libxml2 support.
1373 This happens by default if a suitably recent version of the library is
1374 found at build time. To prevent this, use the configure option
1375 `--without-xml2'. See below for libxml2 features.
1376
1377 ** By default, the installed Info and man pages are compressed.
1378 You can disable this by configuring --without-compress-info.
1379
1380 ** New configure option --with-wide-int.
1381 With it, Emacs integers typically have 62 bits, even on 32-bit machines.
1382 On 32-bit hosts, this raises the limit on buffer sizes from about 512 MiB
1383 to about 2 GiB.
1384
1385 ** New configure options: --with-mmdf, --with-mail-unlink, --with-mailhost.
1386 These provide no new functionality, they just remove the need to edit
1387 lib-src/Makefile by hand in order to use the associated features.
1388
1389 ** New configure option --enable-use-lisp-union-type.
1390 This is only useful for Emacs developers to debug certain types of bugs.
1391 This is not a new feature; only the configure flag is new.
1392
1393 ** The standalone programs digest-doc and sorted-doc are removed.
1394 Emacs now uses Lisp commands `doc-file-to-man' and `doc-file-to-info'.
1395
1396 ** The standalone program `fakemail' is removed.
1397 If you need it, feedmail.el provides a superset of the functionality.
1398
1399 \f
1400 * Startup Changes in Emacs 24.1
1401
1402 ** The --unibyte, --multibyte, --no-multibyte, and --no-unibyte
1403 command line arguments, and the EMACS_UNIBYTE environment variable, no
1404 longer have any effect. (They were declared obsolete in Emacs 23.)
1405
1406 ** New command line option `--no-site-lisp' removes site-lisp directories
1407 from load-path. -Q now implies this. This option does not affect the
1408 EMACSLOADPATH environment variable (and hence has no effect for
1409 Nextstep builds).
1410
1411 \f
1412 * Changes in Emacs 24.1
1413
1414 ** Completion
1415
1416 *** Many packages now use the `completion-at-point' command,
1417 rather than implementing separate completion commands.
1418
1419 *** `completion-at-point' now handles tags and semantic completion.
1420
1421 *** Completion in a non-minibuffer now tries to detect the end of completion
1422 and pops down the *Completions* buffer accordingly.
1423
1424 *** New option `completion-cycle-threshold' allows completion cycling.
1425
1426 *** New option `completion-category-overrides' for overriding the
1427 default completion style in certain circumstances.
1428
1429 *** New completion style `substring'.
1430
1431 *** Completion of buffer names uses `substring' completion by default.
1432
1433 *** The option `widget-complete-field' has been removed.
1434
1435 ** Mail changes
1436
1437 *** The first time you try sending mail, Emacs asks for a mail method.
1438 This is implemented by a new default for `send-mail-function', which
1439 is `sendmail-query-once'. This offers to use the smtpmail package, or
1440 to use the old defaults relying on external mail facilities
1441 (`sendmail-send-it' on GNU/Linux and other Unix-like systems, and
1442 `mailclient-send-it' on Windows).
1443
1444 *** Typing `C-c m' in the buffer made by `M-x report-emacs-bug'
1445 transfers the report to your desktop's preferred mail client, if there
1446 is one. This uses either the "xdg-email" utility, or Mac OS's "open"
1447 command.
1448
1449 *** See Changes in Specialized Modes and Packages for SMTPmail changes
1450 and Mail mode changes
1451
1452 ** Emacs server and client changes
1453
1454 *** New option `server-port' specifies the port for TCP Emacs servers.
1455
1456 *** New emacsclient argument -q/--quiet suppresses some status messages.
1457
1458 *** New emacsclient argument --frame-parameters specifies the frame
1459 parameters of any newly-created graphical frame.
1460
1461 *** If emacsclient shuts down due to Emacs signaling an error,
1462 its exit status is 1.
1463
1464 *** New emacsclient argument --parent-id ID.
1465 This opens a client frame in parent X window ID, via XEmbed, similar
1466 to the --parent-id argument to Emacs.
1467
1468 ** Internationalization changes
1469
1470 *** Emacs now supports display and editing of bidirectional text.
1471 Right-to-left (RTL) scripts, such as Arabic, Farsi, and Hebrew, are
1472 displayed in the correct visual order as expected by users of those
1473 scripts. The display reordering is a "full bidirectionality" class
1474 implementation of the Unicode Bidirectional Algorithm (UBA). Buffers
1475 with no RTL text should look exactly the same as before.
1476
1477 **** New buffer-local variable `bidi-display-reordering'.
1478 To disable display reordering in a buffer, change this to nil.
1479
1480 **** New buffer-local variable `bidi-paragraph-direction'.
1481 If nil (the default), Emacs determines the base direction of each
1482 paragraph from its text, as specified by the UBA. Setting the value
1483 to `right-to-left' or `left-to-right' forces a base direction on each
1484 paragraph.
1485
1486 Paragraphs with right-to-left base direction are displayed starting at
1487 the right window edge.
1488
1489 *** Enhanced support for characters with no glyphs in available fonts,
1490 or, on text terminals, characters that cannot be encoded by the
1491 terminal coding system. The new option `glyphless-char-display-control'
1492 specifies how to display them: as a hexadecimal code in a box, a thin
1493 1-pixel space, an empty box, etc.
1494
1495 *** New input methods for Farsi and Bulgarian
1496 (farsi-isiri-9147, farsi-transliterate-banan, bulgarian-alt-phonetic).
1497
1498 *** `nobreak-char-display' now also highlights Unicode hyphen chars
1499 (U+2010 and U+2011).
1500
1501 *** New Hebrew translation of the Emacs Tutorial.
1502 Type `C-u C-h t' to choose it in case your language setup doesn't
1503 automatically select it.
1504
1505 ** An Emacs Lisp package manager is now included.
1506 This is a convenient way to download and install additional packages,
1507 from a package repository at http://elpa.gnu.org.
1508
1509 *** M-x list-packages shows a list of packages, which can be
1510 selected for installation.
1511
1512 *** New command `describe-package', bound to `C-h P'.
1513
1514 *** By default, all installed packages are loaded automatically when
1515 Emacs starts up. To disable this, set `package-enable-at-startup' to
1516 nil. To specify the packages to load, customize `package-load-list'.
1517
1518 ** Custom theme changes
1519
1520 *** New command `M-x customize-themes', which provides a convenient
1521 interface for enabling and disabling Custom themes.
1522
1523 *** New option `custom-theme-load-path' is the load path for themes.
1524 Emacs no longer looks for Custom themes in `load-path'. The default
1525 value of `custom-theme-load-path' says to look for themes in
1526 `custom-theme-directory', followed by a subdirectory of
1527 `data-directory' named "themes/", which contains a small selection of
1528 built-in Custom themes.
1529
1530 *** New option `custom-safe-themes' records known-safe theme files.
1531 If a theme is not in this list, Emacs queries before loading it, and
1532 offers to save the theme to `custom-safe-themes' automatically. By
1533 default, all themes included in Emacs are treated as safe.
1534
1535 ** Improved GTK integration
1536
1537 *** GTK scroll-bars are now placed on the right by default.
1538 The function `set-scroll-bar-mode' can change this.
1539
1540 *** GTK tool bars can have just text, just images or images and text.
1541 Customize `tool-bar-style' to choose the style. On a Gnome desktop,
1542 the default is taken from desktop settings.
1543
1544 *** GTK tool bars can be placed on any edge of the frame.
1545 The frame-parameter tool-bar-position controls this. It takes the
1546 values top, left, right or bottom. The Options => Show/Hide menu has
1547 entries for this.
1548
1549 *** The default colors for selected text (the `region' face) are taken
1550 from the GTK theme when Emacs is built with GTK.
1551
1552 *** Emacs uses GTK tooltips by default if built with GTK.
1553 You can disable this by changing `x-gtk-use-system-tooltips' to nil.
1554
1555 ** Graphical interface changes
1556
1557 *** On graphical displays, the mode-line no longer ends in dashes.
1558 Also, the first dash (which does not indicate anything) is just
1559 displayed as a space.
1560
1561 *** `menu-bar-select-buffer-function' lets you choose another operation
1562 instead of `switch-to-buffer' when selecting an item in the Buffers menu.
1563
1564 *** Lucid menus and dialogs can display antialiased fonts if Emacs is
1565 built with Xft. These fonts can be set via X resources, for example:
1566 Emacs.pane.menubar.font: Courier-12
1567
1568 ** Exiting changes
1569
1570 *** Emacs now calls `kill-emacs' if it receives SIGTERM or SIGHUP,
1571 or if it receives a SIGINT signal in batch mode.
1572
1573 *** `kill-emacs-hook' is now also run in batch mode.
1574 Third-party code which adds to `kill-emacs-hook' should check if they
1575 do the right thing in batch mode.
1576
1577 ** Scrolling changes
1578
1579 *** New scrolling commands `scroll-up-command' and `scroll-down-command'
1580 (bound to C-v/[next] and M-v/[prior]) do not signal errors at top/bottom
1581 of buffer at first key-press (instead they move to top/bottom of buffer)
1582 when `scroll-error-top-bottom' is non-nil.
1583
1584 *** New option `scroll-error-top-bottom' (see above).
1585
1586 *** New scrolling commands `scroll-up-line' and `scroll-down-line'
1587 scroll a line instead of full screen.
1588
1589 *** New property `scroll-command' should be set on a command's symbol to
1590 define it as a scroll command affected by `scroll-preserve-screen-position'.
1591
1592 *** If you customize `scroll-conservatively' to a value greater than 100,
1593 Emacs will never recenter point in the window when it scrolls due to
1594 cursor motion commands or commands that move point (e.f., `M-g M-g').
1595 Previously, you needed to use `most-positive-fixnum' as the value of
1596 `scroll-conservatively' to achieve the same effect.
1597
1598 *** "Aggressive" scrolling now honors the scroll margins.
1599 If you customize `scroll-up-aggressively' or
1600 `scroll-down-aggressively' and move point off the window, Emacs now
1601 scrolls the window so as to avoid positioning point inside the scroll
1602 margin.
1603
1604 ** Basic SELinux support has been added.
1605 This requires Emacs to be linked with libselinux at build time.
1606
1607 *** Emacs preserves the SELinux file context when backing up.
1608 Also, the function `copy-file' has an extra optional argument for
1609 preserving SELinux context, and the return value of `backup-buffer'
1610 now includes the SELinux context.
1611
1612 *** New functions `file-selinux-context' and `set-file-selinux-context'
1613 get and set the SELinux context of a file.
1614
1615 ** Trash changes
1616
1617 *** `delete-by-moving-to-trash' now only affects commands that specify
1618 trashing. This avoids inadvertently trashing temporary files.
1619
1620 *** Calling `delete-file' or `delete-directory' with a prefix argument
1621 now forces true deletion, regardless of `delete-by-moving-to-trash'.
1622
1623 ** File- and directory-local variable changes
1624
1625 *** You can stop directory local vars from applying to subdirectories.
1626 Add an element (subdirs . nil) to the alist portion of any variables
1627 settings to indicate that the section should not apply to
1628 subdirectories.
1629
1630 *** Directory local variables can apply to some file-less buffers.
1631 Affected modes include dired, vc-dir, and log-edit. For example,
1632 adding "(diff-mode . ((mode . whitespace)))" to .dir-locals.el will
1633 turn on `whitespace-mode' for *vc-diff* buffers. Modes should call
1634 `hack-dir-local-variables-non-file-buffer' to support this.
1635
1636 *** Using "mode: MINOR-MODE" to enable a minor mode is deprecated.
1637 Instead, use "eval: (minor-mode 1)".
1638
1639 *** The variable `inhibit-first-line-modes-regexps' has been renamed
1640 to `inhibit-local-variables-regexps'. As the name suggests, it now
1641 applies to ALL file local variables, not just -*- lines. The
1642 associated `inhibit-first-line-modes-suffixes' has been renamed in the
1643 corresponding way.
1644
1645 ** Window changes
1646
1647 *** The `quit-window' command now restores the last buffer displayed
1648 in the quitted window.
1649
1650 *** Resizing an Emacs frame now preserves proportional window sizes,
1651 modulo restrictions like window minimum sizes and fixed-size windows.
1652
1653 *** The behavior of `display-buffer' is now customizable in detail.
1654
1655 **** New option `display-buffer-base-action' specifies a list of
1656 user-determined display "actions" (functions and optional arguments
1657 for choosing the displaying window).
1658
1659 This takes precedence over the default display action, which is
1660 specified by `display-buffer-fallback-action'.
1661
1662 **** New option `display-buffer-alist' maps buffer name regexps to
1663 display actions, taking precedence over `display-buffer-base-action'.
1664
1665 *** New option `window-combination-limit'.
1666 The new option `window-combination-limit' allows to return the space
1667 obtained for resizing or creating a window more reliably to the window
1668 from which such space was obtained.
1669
1670 *** New option `window-combination-resize'.
1671 The new option `window-combination-resize' allows to split a window that
1672 otherwise cannot be split because it's too small by stealing space from
1673 other windows in the same combination. Subsequent resizing or deletion
1674 of the window will resize all windows in the same combination as well.
1675
1676 *** New option `frame-auto-hide-function' lets you choose between
1677 iconifying or deleting a frame when burying a buffer in a dedicated
1678 frame, or quitting a window showing a buffer in a frame of its own.
1679
1680 *** New commands `maximize-window' and `minimize-window'.
1681 These maximize and minimize the size of a window within its frame.
1682
1683 *** New commands `switch-to-prev-buffer' and `switch-to-next-buffer'.
1684 These functions allow to navigate through the live buffers that have
1685 been shown in a specific window.
1686
1687 ** Minibuffer changes
1688
1689 *** The inactive minibuffer has its own major mode `minibuffer-inactive-mode'.
1690 This is handy for minibuffer-only frames, and is also used for the feature
1691 where mouse-1 pops up *Messages*"', which can now easily be changed.
1692
1693 *** Minibuffers set `truncate-lines' to nil.
1694 If you want to change the value to something else, you could use
1695 for example `minibuffer-setup-hook'.
1696
1697 ** `auto-mode-case-fold' is now enabled by default.
1698
1699 ** `backup-by-copying-when-mismatch' now defaults to t.
1700
1701 ** New basic faces `error', `warning', `success'.
1702 These are used to highlight text indicating failure, caution or
1703 successful operation.
1704
1705 ** New option `list-colors-sort' defines the color sort order
1706 for `list-colors-display'.
1707
1708 ** The variable `focus-follows-mouse' now always defaults to nil.
1709
1710 \f
1711 * Editing Changes in Emacs 24.1
1712
1713 ** Search changes
1714
1715 *** C-y in Isearch is now bound to `isearch-yank-kill', instead of
1716 `isearch-yank-line'.
1717
1718 *** M-y in Isearch is now bound to `isearch-yank-pop', instead of
1719 `isearch-yank-kill'.
1720
1721 *** M-s C-e in Isearch is now bound to `isearch-yank-line'.
1722
1723 ** New commands `count-words-region' and `count-words'.
1724
1725 *** M-= is bound to `count-words-region', not `count-lines-region'.
1726 The `count-words-region' command, when called interactively, reports
1727 the number of lines, words, and characters in the region. It is a
1728 superset of the old `count-lines-region', which is now an obsolete
1729 alias for it.
1730
1731 ** The command `just-one-space' (M-SPC), if given a negative argument,
1732 also deletes newlines around point.
1733
1734 ** Deletion changes
1735
1736 *** New option `delete-active-region'.
1737 If non-nil, [delete] and DEL delete the region if it is active and no
1738 prefix argument is given. If set to `kill', those commands kill
1739 instead.
1740
1741 *** New command `delete-forward-char', bound to [delete].
1742 This is meant for interactive use, and obeys `delete-active-region'.
1743 The command `delete-char' does not obey `delete-active-region'.
1744
1745 *** `delete-backward-char' is now a Lisp function.
1746 Apart from obeying `delete-active-region', its behavior is unchanged.
1747 However, the byte compiler now warns if it is called from Lisp; Lisp
1748 callers should use delete-char with a negative argument instead.
1749
1750 *** The option `mouse-region-delete-keys' has been deleted.
1751
1752 ** Selection changes.
1753
1754 The default handling of clipboard and primary selections has been
1755 changed to conform with modern X applications. In short, most
1756 commands for killing and yanking text now use the clipboard, while
1757 mouse commands use the primary selection.
1758
1759 In the following, we provide a list of these changes, followed by a
1760 list of steps to get the old behavior back if you prefer that.
1761
1762 *** `select-active-regions' now defaults to t.
1763 Merely selecting text (e.g. with drag-mouse-1) no longer puts it in
1764 the kill ring. The selected text is put in the primary selection, if
1765 the system possesses a separate primary selection facility (e.g. X).
1766
1767 **** `select-active-regions' also accepts a new value, `only'.
1768 This means to only set the primary selection for temporarily active
1769 regions (usually made by mouse-dragging or shift-selection);
1770 "ordinary" active regions, such as those made with C-SPC followed by
1771 point motion, do not alter the primary selection.
1772
1773 **** `mouse-drag-copy-region' now defaults to nil.
1774
1775 *** mouse-2 is now bound to `mouse-yank-primary'.
1776 This pastes from the primary selection, ignoring the kill-ring.
1777 Previously, mouse-2 was bound to `mouse-yank-at-click'.
1778
1779 *** `x-select-enable-clipboard' now defaults to t on all platforms.
1780
1781 *** `x-select-enable-primary' now defaults to nil.
1782 Thus, commands that kill text or copy it to the kill-ring (such as
1783 M-w, C-w, and C-k) also use the clipboard---not the primary selection.
1784
1785 **** The "Copy", "Cut", and "Paste" items in the "Edit" menu are now
1786 exactly equivalent to M-w, C-w, and C-y respectively.
1787
1788 **** Note that on MS-Windows, `x-select-enable-clipboard' was already
1789 non-nil by default, as Windows does not support the primary selection
1790 between applications.
1791
1792 *** To return to the previous behavior, do the following:
1793
1794 **** Change `select-active-regions' to nil.
1795 **** Change `mouse-drag-copy-region' to t.
1796 **** Change `x-select-enable-primary' to t (on X only).
1797 **** Change `x-select-enable-clipboard' to nil.
1798 **** Bind `mouse-yank-at-click' to mouse-2.
1799
1800 *** Support for X cut buffers has been removed.
1801
1802 *** X clipboard managers are now supported.
1803 To inhibit this, change `x-select-enable-clipboard-manager' to nil.
1804
1805 ** New command `C-x r N' (`rectangle-number-lines') numbers the lines
1806 in the current rectangle. With a prefix argument, this prompts for a
1807 number to count from and for a format string.
1808
1809 ** `redisplay-dont-pause' now defaults to t.
1810 This makes Emacs feel more responsive to editing commands that arrive
1811 at high rate, e.g. if you lean on some key, because stopping redisplay
1812 in the middle (when this variable is nil) forces more expensive
1813 updates later on, and Emacs appears to be unable to keep up.
1814
1815 ** The behavior of <TAB> for active regions in Text mode has changed.
1816 In Text and related modes, typing <TAB> (`indent-for-tab-command')
1817 when the region is active causes Emacs to indent all the lines in the
1818 region, aligning them with the line previous to the first line in the
1819 region (or with the left margin if there is no previous line).
1820
1821 ** When `occur' is called with a prefix argument, matching strings are
1822 collected into the `*Occur*' buffer without line numbers. If there
1823 are parenthesized subexpressions in the specified regexp, `occur'
1824 reads replacement text that may contain \\& and \\N whose convention
1825 follows `replace-match'.
1826
1827 \f
1828 * Changes in Specialized Modes and Packages in Emacs 24.1
1829
1830 ** Archive Mode has basic support for browsing and updating 7z archives.
1831
1832 ** BibTeX mode
1833
1834 *** BibTeX mode now supports biblatex.
1835 Use the variable `bibtex-dialect' to select different BibTeX dialects.
1836 `bibtex-entry-field-alist' is now an obsolete alias for
1837 `bibtex-BibTeX-entry-alist'.
1838
1839 *** New command `bibtex-search-entries', bound to C-c C-a.
1840
1841 *** New `bibtex-entry-format' option `sort-fields', disabled by default.
1842
1843 *** New variable `bibtex-search-entry-globally'.
1844
1845 ** Browse-url
1846
1847 *** New option `browse-url-mailto-function' specifies how to handle "mailto:"s.
1848
1849 *** The default browser used by the package is now the "xdg-open" program,
1850 on platforms that support it. This calls your desktop's preferred browser.
1851
1852 ** Calc
1853
1854 *** Support for musical notes.
1855
1856 *** Support for logarithmic units.
1857
1858 *** No longer uses the tex prefix for TeX specific unit names when
1859 using TeX or LaTeX mode.
1860
1861 *** New option to highlight selections using faces.
1862
1863 *** `calc-histogram' has the option of using a vector to determine the bins.
1864
1865 *** New "O" option prefix.
1866
1867 *** Use the "O" prefix to "d r" (`calc-radix') to turn on twos-complement mode.
1868
1869 ** Calendar, Diary, and Appt
1870
1871 *** Diary entries can contain non-printing "comments".
1872 See the variable `diary-comment-start'.
1873
1874 *** Appointments can specify their individual warning times.
1875 See the variable `appt-warning-time-regexp'.
1876
1877 *** The function specified by `appt-disp-window-function' may be passed
1878 lists of arguments if multiple appointments are due at similar times.
1879 If you are using a custom function for this, you should update it.
1880
1881 *** New function `diary-hebrew-birthday'.
1882
1883 *** Elements of `calendar-day-abbrev-array' and `calendar-month-abbrev-array'
1884 may no longer be nil, but must all be strings.
1885
1886 *** The obsolete (since Emacs 22.1) method of enabling the appt
1887 package by adding `appt-make-list' to `diary-hook' has been removed.
1888 Use `appt-activate' instead.
1889
1890 *** Some appt variables (obsolete since Emacs 22.1) have been removed:
1891 appt-issue-message (use the function appt-activate)
1892 appt-visible/appt-msg-window (use the variable appt-display-format)
1893
1894 *** Some diary function aliases (obsolete since Emacs 22.1) have been removed:
1895 view-diary-entries, list-diary-entries, show-all-diary-entries
1896
1897 ** CC Mode
1898
1899 *** New feature to "guess" the style in an existing buffer.
1900 The main entry point is M-x c-guess.
1901
1902 *** Java Mode now supports Java 5.0 (Tiger) and 6 (Mustang).
1903
1904 *** `c-beginning-of-defun' and `c-end-of-defun' now respect nested scopes.
1905 Thus C-M-a will, by default, go to the beginning of the immediate function,
1906 not the top level.
1907
1908 *** "Macros with semicolons" can be registered for correct indentation.
1909 Where such a macro ends a line (no semicolon) the next statement is no longer
1910 parsed as a statement continuation.
1911
1912 ** Comint and modes derived from it use the standard completion code.
1913
1914 ** Compilation mode
1915
1916 *** Compilation mode can be used without Font Lock mode.
1917 `compilation-parse-errors-function' is now obsolete.
1918
1919 *** New variable `compilation-filter-start', which is bound while
1920 `compilation-filter-hook' runs. It records the start position of the
1921 text inserted by `compilation-filter'.
1922
1923 *** `compilation-error-screen-columns' and `compilation-first-column'
1924 are obeyed in the editing buffer. So programming language modes can
1925 set them, whereas previously only the value in the *Compilation*
1926 buffer was used.
1927
1928 ** Customize
1929
1930 *** Customize buffers now contain a search field.
1931 The search is performed using `customize-apropos'.
1932 To turn off the search field, set `custom-search-field' to nil.
1933
1934 *** Options in customize group buffers start out hidden if not customized.
1935 Use the arrow to the left of the option name to toggle visibility.
1936
1937 *** custom-buffer-sort-alphabetically now defaults to t.
1938
1939 *** The color widget now has a "Choose" button, which allows you to
1940 choose a color via `list-colors-display'.
1941
1942 ** D-Bus
1943
1944 *** It is now possible to access buses other than the default system
1945 or session bus.
1946
1947 *** The `dbus-register-method' and `dbus-register-property' functions
1948 optionally do not register names.
1949
1950 *** The new function `dbus-register-service' registers a known service
1951 name on a D-Bus without also registering a property or a method.
1952
1953 ** Dired-x
1954
1955 *** C-x C-j (`dired-jump') and C-x 4 C-j (`dired-jump-other-window'),
1956 if called with a prefix argument, read a file name from the minibuffer
1957 instead of using the current buffer.
1958
1959 *** The "dired local variables" feature of Dired-x is obsolete.
1960 The standard directory local variables feature replaces it.
1961
1962 ** ERC changes
1963
1964 *** New options `erc-autojoin-timing' and `erc-autojoin-delay',
1965 controlling attempts to autojoin a channel.
1966
1967 *** New variable `erc-coding-system-precedence': If we use `undecided'
1968 as the server coding system, this variable will then be consulted.
1969 The default is to decode strings that can be decoded as utf-8 as
1970 utf-8, and do the normal `undecided' decoding for the rest.
1971
1972 ** Eshell changes
1973
1974 *** The default value of `eshell-directory-name' has changed
1975 to be an "eshell" directory in `user-emacs-directory'.
1976 The old "~/.eshell/" directory is still used if it exists, though.
1977
1978 ** gdb-mi
1979
1980 *** The M-x gdb command now uses the GDB Machine Interface protocol.
1981 It now supports multithread non-stop debugging and simultaneous
1982 debugging of several threads.
1983
1984 ** Image mode
1985
1986 *** RET (`image-toggle-animation') toggles animation, if applicable.
1987 Animation plays once, unless the option `image-animate-loop' is non-nil.
1988
1989 ** Info
1990
1991 *** New command M-x info-display-manual displays a named Info manual.
1992 If that manual is already visited in some Info buffer, it displays
1993 that buffer. (This is handy if you have many manuals in many *info*
1994 buffers, and don't remember the name of the buffer visiting the manual
1995 you want to consult.) Otherwise, it loads and displays the manual.
1996
1997 *** `e' is now bound to `end-of-buffer' rather than to `Info-edit'.
1998 This is for compatibility with the stand-alone Info reader program,
1999 and also because `Info-edit' is a rarely used command that is disabled
2000 by default.
2001
2002 ** Mail mode changes (not Message mode)
2003
2004 *** New command M-x mail-add-attachment for adding MIME attachments
2005
2006 *** The command M-x mail-attach-file was renamed to M-x mail-insert-file.
2007 (Its name is misleading, since it has nothing to do with MIME
2008 attachments.) The old name is now an obsolete alias to the new name.
2009
2010 ** MH-E has been updated to MH-E version 8.3.1.
2011 See MH-E-NEWS for details.
2012
2013 ** Modula-2 mode provides auto-indentation.
2014
2015 ** mpc.el: Can use pseudo tags of the form tag1|tag2 as a union of two tags.
2016
2017 ** nXML mode no longer binds C-RET to `nxml-complete'.
2018 Completion is now performed via `completion-at-point', bound to C-M-i
2019 or M-TAB. If `nxml-bind-meta-tab-to-complete-flag' is non-nil (the
2020 default), this performs tag completion.
2021
2022 ** Org mode has been updated to version 7.8.09.
2023 See ORG-NEWS for details.
2024
2025 ** Prolog mode has been completely revamped, with lots of additional
2026 functionality such as more intelligent indentation, electricity,
2027 support for more variants, including Mercury, and a lot more.
2028
2029 ** Rmail
2030
2031 *** The command `rmail-epa-decrypt' decrypts OpenPGP data
2032 in the Rmail incoming message.
2033
2034 *** The variable `rmail-message-filter' no longer has any effect.
2035 This change was made in Emacs 23.1 but was not advertised at the time.
2036 Try using `rmail-show-message-hook' instead.
2037
2038 ** Shell mode
2039
2040 *** M-x shell prompts for the shell path name if the default directory
2041 is a remote file name and neither the environment variable $ESHELL nor
2042 the variable `explicit-shell-file-name' is set.
2043
2044 *** TAB is now bound to the standard `completion-at-point' command,
2045 which now implements the pcomplete rules for shell command completion.
2046
2047 ** SMTPmail
2048
2049 *** SMTPmail now uses encrypted connections (via STARTTLS) by default
2050 if the mail server supports them. This uses either built-in GnuTLS
2051 support, or the starttls.el library. Customize `smtpmail-stream-type'
2052 to change this.
2053
2054 *** The variable `smtpmail-auth-credentials' has been removed.
2055 By default, the information is now stored in the file ~/.authinfo.
2056 This was the default value of smtpmail-auth-credentials. If you had
2057 customized smtpmail-auth-credentials to a list of user names and
2058 passwords, those settings are not used. During your first connection
2059 to the smtp server, Emacs will prompt for the user name and password,
2060 and offer to save them to ~/.authinfo. Or you can manually copy the
2061 credentials to ~/.authinfo. For example, if you had
2062
2063 (setq smtpmail-auth-credentials
2064 '(("mail.example.org" 25 "jim" "s!cret")))
2065
2066 then the equivalent line in ~/.authinfo would be
2067
2068 machine mail.example.org port 25 login jim password s!cret
2069
2070 See the auth-source manual for more information, e.g. on encrypting
2071 the credentials file.
2072
2073 *** The variable `smtpmail-starttls-credentials' has been removed.
2074 If you had that set, you need to put
2075
2076 machine smtp.whatever.foo port 25 key "~/.my_smtp_tls.key" cert "~/.my_smtp_tls.cert"
2077
2078 in your ~/.authinfo file instead.
2079
2080 *** SMTPmail defaults to using the address in the From: header as the
2081 SMTP MAIL FROM envelope. To override this, set `mail-envelope-from'
2082 to the address you wish to use instead.
2083
2084 ** SQL mode
2085
2086 *** New options `sql-port', `sql-connection-alist', `sql-send-terminator',
2087 and `sql-oracle-scan-on'.
2088
2089 *** New options controlling prompting for login parameters.
2090 Each supported product has a custom variable `sql-*-login-params',
2091 which is a list of the parameters to be prompted for before a
2092 connection is established.
2093
2094 *** The command `sql-product-interactive' now takes a prefix argument,
2095 which causes it to prompt for an SQL product.
2096
2097 *** Product-specific SQL interactive commands now take prefix arguments.
2098 These commands (`sql-sqlite', `sql-postgres', `sql-mysql', etc.),
2099 given a prefix argument, prompt for a name for the SQL interactive
2100 buffer. This reduces the need for calling `sql-rename-buffer'.
2101
2102 *** SQL interactive modes suppress command continuation prompts, and
2103 replace tabs with spaces. The first change impacts multiple line SQL
2104 statements entered with C-j between each line, statements yanked into
2105 the buffer and statements sent with `sql-send-*' functions. The
2106 second prevents the MySQL and Postgres interpreters from listing
2107 object name completions when sent text via `sql-send-*' functions.
2108
2109 *** New command `sql-connect' starts a predefined SQLi session,
2110 using the login parameters from `sql-connection-alist'.
2111
2112 *** New "Save Connection" menu item in SQLi buffers.
2113 This gathers the login params specified for the SQLi session, if it
2114 was not started by a connection, and saves them as a new connection.
2115
2116 *** New commands for listing database objects and details:
2117 sql-list-all and sql-list-table.
2118
2119 *** An API for manipulating SQL product definitions has been added.
2120
2121 ** TeX modes
2122
2123 *** latex-electric-env-pair-mode keeps \begin..\end matched on the fly.
2124
2125 ** Tramp
2126
2127 *** New inline access method "ksu" (kerberized su).
2128
2129 *** The following access methods are discontinued: "ssh1_old",
2130 "ssh2_old", "scp1_old", "scp2_old", "imap", "imaps" and "fish".
2131
2132 *** The user option `remote-file-name-inhibit-cache' controls whether
2133 remote file attributes are cached for better performance.
2134
2135 *** The option `ange-ftp-binary-file-name-regexp' has changed its
2136 default value to "".
2137
2138 *** Handlers for `file-selinux-context' and `set-file-selinux-context'
2139 for remote machines which support SELinux.
2140
2141 ** New function `url-queue-retrieve', which behaves like url-retrieve,
2142 but with limits (`url-queue-parallel-processes', `url-queue-timeout') on
2143 the degree of parallelism.
2144
2145 ** VC and related modes
2146
2147 *** Support for pulling on distributed version control systems.
2148 The command C-x v + (`vc-pull') runs a "pull" operation, if it is
2149 supported (currently with Bzr, Git, and Mercurial), to update the
2150 current branch and working tree. A prefix argument means to prompt
2151 the user for specifics, e.g. a pull location.
2152
2153 *** `vc-update' is now an alias for `vc-pull'.
2154
2155 *** Support for merging on distributed version control systems.
2156 The command C-x v m (`vc-merge') now runs a "merge" operation, if it
2157 is supported (currently with Bzr, Git, and Mercurial), to merge
2158 changes from another branch into the current one. It prompts for
2159 specifics, e.g. a merge source.
2160
2161 *** New option `vc-revert-show-diff' controls whether `vc-revert'
2162 shows a diff while querying the user. It defaults to t.
2163
2164 *** Log entries in some Log View buffers can be toggled to display a
2165 longer description by typing RET (log-view-toggle-entry-display).
2166 This is currently supported for Bzr, Git, and Mercurial (to support
2167 another backend, define a `log-view-expanded-log-entry-function').
2168 In the Log View buffers made by C-x v L (`vc-print-root-log'), you can
2169 use this to display the full log entry for the revision at point.
2170
2171 *** New command `vc-ediff' allows visual comparison of two revisions
2172 of a file similar to `vc-diff', but using ediff backend.
2173
2174 *** The option `vc-initial-comment' was removed in Emacs 23.2, but
2175 this was not advertised at the time.
2176
2177 *** `vc-toggle-read-only' is an obsolete alias for `toggle-read-only'.
2178 Since Emacs 23, it has done the same thing as `toggle-read-only', but
2179 this was not advertised at the time.
2180
2181 ** Obsolete modes
2182
2183 *** abbrevlist.el
2184
2185 *** erc-hecomplete.el (use erc-pcomplete.el instead)
2186
2187 *** partial-completion-mode (complete.el) is obsolete.
2188 You can get a comparable behavior with:
2189 (setq completion-styles '(partial-completion initials))
2190 (setq completion-pcm-complete-word-inserts-delimiters t)
2191
2192 *** pc-mode.el is obsolete (CUA mode is much more comprehensive).
2193
2194 *** pgg is obsolete (use EasyPG instead).
2195
2196 *** sregex.el is obsolete, since rx.el is a strict superset.
2197
2198 *** s-region.el and pc-select.el are obsolete.
2199 They are superseded by shift-select-mode, enabled by default since 23.1.
2200
2201 *** vc-mcvs.el is obsolete (for lack of a maintainer).
2202
2203 ** Miscellaneous
2204
2205 *** The Landmark game is now invoked with `landmark', not `lm'.
2206 Its functions and variables have been similarly renamed.
2207
2208 *** In `ido-file-completion-map', C-v is no longer bound to `ido-toggle-vc'.
2209 (This interfered with cua-mode.)
2210
2211 *** f90.el has some support for Fortran 2008 syntax.
2212
2213 *** `copyright-fix-years' can optionally convert consecutive years to ranges.
2214
2215 *** New command `nato-region' converts text to NATO phonetic alphabet.
2216
2217 \f
2218 * New Modes and Packages in Emacs 24.1
2219
2220 ** Occur Edit mode applies edits made in *Occur* buffers to the
2221 original buffers. It is bound to "e" in Occur mode.
2222
2223 ** New global minor mode electric-pair-mode.
2224 When enabled, typing an open parenthesis automatically inserts the
2225 matching closing one.
2226
2227 ** New global minor mode electric-indent-mode.
2228 When enabled, typing certain characters triggers reindentation.
2229 Major modes wishing to use this can set electric-indent-chars or
2230 electric-indent-functions.
2231
2232 ** New global minor mode electric-layout-mode.
2233 When enabled, typing certain characters automatically inserts newlines.
2234 Major modes wishing to use this can set electric-layout-rules.
2235
2236 ** tabulated-list.el provides a generic major mode for tabulated data,
2237 from which other modes can be derived.
2238
2239 ** pcase.el provides the ML-style pattern matching macro `pcase'.
2240
2241 ** secrets.el is an implementation of the Secret Service API, an
2242 interface to password managers like GNOME Keyring or KDE Wallet. The
2243 Secret Service API requires D-Bus for communication. The command
2244 `secrets-show-secrets' offers a buffer with a visualization of the
2245 secrets.
2246
2247 ** notifications.el provides an implementation of the Desktop
2248 Notifications API. It requires D-Bus for communication.
2249
2250 ** soap-client.el supports access to SOAP web services from Emacs.
2251 soap-inspect.el is an interactive inspector for SOAP WSDL structures.
2252
2253 ** New generic mode, xmodmap-generic-mode, for xmodmap files.
2254
2255 ** New emacs-lock.el package.
2256 The previous version has been moved to obsolete/old-emacs-lock.el.
2257 Now, there is a proper minor mode `emacs-lock-mode'. Protection
2258 against exiting Emacs and killing the buffer can be set separately.
2259 The mechanism for automatically turning off protection for buffers
2260 with dead inferior processes has been generalized.
2261
2262 \f
2263 * Incompatible Lisp Changes in Emacs 24.1
2264
2265 ** Passing a nil argument to a minor mode function call now ENABLES
2266 the minor mode unconditionally. This is so that you can write e.g.
2267
2268 (add-hook 'text-mode-hook 'foo-mode)
2269
2270 to enable foo-mode in Text mode buffers, removing the need for
2271 `turn-on-foo-mode' style functions. This affects all mode commands
2272 defined by `define-minor-mode'. If called interactively, the mode
2273 command still toggles the minor mode.
2274
2275 ** The return value of `backup-buffer' has changed.
2276 It is now a list of three elements, where the second element is a list
2277 describing the original file's SELinux context. If Emacs or the
2278 system lacks SELinux support, the context list is (nil nil nil nil).
2279 See "Basic SELinux support" above, under "Changes in Emacs 24.1".
2280
2281 ** `char-direction-table' and the `char-direction' function were deleted.
2282 They were buggy and inferior to the new support of bidirectional
2283 editing introduced in Emacs 24. If you need the bidirectional
2284 properties of a character, use `get-char-code-property' with the last
2285 argument `bidi-class'.
2286
2287 ** `copy-directory' now copies the source directory as a subdirectory
2288 of the target directory, if the latter is an existing directory. The
2289 new optional arg COPY-CONTENTS, if non-nil, makes the function copy
2290 the contents directly into a pre-existing target directory.
2291
2292 ** For mouse click input events in the text area, the Y pixel
2293 coordinate in the POSITION list now counts from the top of the text
2294 area, excluding any header line. Previously, it counted from the top
2295 of the header line.
2296
2297 ** Support for "old-style" backquotes, obsolete for 10+ years, has
2298 been further reduced. Now a backquote not followed by a space is
2299 always treated as a "new-style" backquote. Please remove all
2300 "old-style" backquotes from your code. If your code uses backquotes
2301 as documented in the Elisp manual, and compiles without warning, then
2302 you have nothing to do in this regard. Code not following the
2303 appropriate conventions may fail to compile.
2304
2305 The most common cause of trouble seems to be an old-style backquote
2306 followed by a newline. Another cause of trouble is vector notation
2307 for key sequence notation: instead of [(control ,)] and [(control ')],
2308 you should write [(control ?,)] and [(control ?')], which will work in
2309 older Emacsen too.
2310
2311 ** The macro `eval-at-startup' was removed in Emacs 23.2, but this
2312 was not advertised at the time. The function `custom-initialize-delay'
2313 replaced all known uses.
2314
2315 ** `view-buffer' now treats special mode-class in the same way that
2316 `view-file' has since Emacs 22 (i.e. it won't enable View mode if the
2317 major mode is special).
2318
2319 ** Menu and tool bar changes
2320
2321 *** During startup, Emacs no longer adds entries for `menu-bar-lines'
2322 and `tool-bar-lines' to `default-frame-alist' and `initial-frame-alist'.
2323 With these alist entries omitted, `make-frame' checks the value of the
2324 variable `menu-bar-mode'/`tool-bar-mode' to determine whether to create
2325 a menu-bar or tool-bar, respectively. If the alist entries are added,
2326 they override the value of `menu-bar-mode'/`tool-bar-mode'.
2327
2328 *** The menu bar bindings's caches are not used any more.
2329 Use (where-is-internal <def> nil t) instead.
2330
2331 ** Regions created by mouse dragging are now normal active regions,
2332 similar to those created by shift-selection (see Selection changes
2333 above). In previous Emacs versions, these regions were delineated by
2334 `mouse-drag-overlay'; that variable has been removed.
2335
2336 ** The fourth argument of `filter-buffer-substring' has been removed.
2337 If you want to remove text properties from the final result, simply
2338 pass the result through substring-no-properties.
2339
2340 ** cl.el no longer provides `cl-19'.
2341
2342 ** The following obsolete functions and aliases have been removed
2343 (the appropriate new function is given in parentheses; "not needed"
2344 means you can just remove all calls to the function in question):
2345
2346 *** `comint-kill-output' (`comint-delete-output')
2347 *** `decompose-composite-char' (`char-to-string')
2348 *** `outline-visible' (`outline-invisible-p')
2349 *** `internal-find-face' (`facep')
2350 *** `internal-get-face' (`facep and check-face')
2351 *** `frame-update-faces' (not needed)
2352 *** `frame-update-face-colors' (`frame-set-background-mode')
2353 *** `x-frob-font-weight' and `x-frob-font-slant' (`make-face-*' functions)
2354 *** `x-make-font-bold and x-make-font-demibold (`make-face-bold')
2355 *** `x-make-font-italic' and `x-make-font-oblique' (`make-face-italic')
2356 *** `x-make-font-bold-italic' (`make-face-bold-italic')
2357 *** `x-make-font-unbold' (`make-face-unbold')
2358 *** `x-make-font-unitalic' (`make-face-unitalic')
2359 *** `mldrag-drag-mode-line' (`mouse-drag-mode-line')
2360 *** `mldrag-drag-vertical-line' (`mouse-drag-vertical-line')
2361 *** `iswitchb-default-keybindings' (`iswitchb-mode')
2362 *** `char-bytes' (== 1)
2363 *** `isearch-return-char' (`isearch-printing-char')
2364 *** `make-local-hook' (not needed)
2365 *** `set-screen-height' (`set-frame-height')
2366 *** `set-screen-width' (`set-frame-width')
2367
2368 ** The following obsolete variables and varaliases have been removed
2369 (the appropriate new variable is given in parentheses):
2370
2371 *** `checkdoc-minor-keymap' (`checkdoc-minor-mode-map')
2372 *** `vc-header-alist' (`vc-BACKEND-header')
2373 *** `directory-sep-char' (== ?/)
2374 *** `font-lock-defaults-alist' (`font-lock-defaults')
2375 *** `e' (`float-e').
2376
2377 ** The following obsolete files were removed:
2378 sc.el, x-menu.el, rnews.el, rnewspost.el
2379
2380 ** The format of the finder-inf.el file has changed, since the Finder
2381 mechanism is now based on the package system. The variable
2382 `finder-package-info' is replaced by `package--builtins' and
2383 `finder-keywords-hash'.
2384
2385 ** When generating autoloads, `update-directory-autoloads' no longer
2386 assumes every inspected file is in your `load-path'. It instead
2387 generates relative names according to the current `load-path'.
2388
2389 \f
2390 * Lisp Changes in Emacs 24.1
2391
2392 ** Code can now use lexical scoping by default instead of dynamic scoping.
2393 The `lexical-binding' variable enables lexical scoping for local
2394 variables. It is typically set via a file-local variable in the first
2395 line of the file, in which case it applies to all the code in that
2396 file.
2397
2398 *** `eval' takes a new optional argument `lexical' to choose the new lexical
2399 binding instead of the old dynamic binding mode.
2400
2401 *** Lexically scoped interpreted functions are represented with a new form
2402 of function value which looks like (closure ENV ARGS &rest BODY).
2403
2404 *** New macro `letrec' to define recursive local functions.
2405
2406 *** `defvar' and `defconst' now mark the variable as special (dynamic).
2407 So do `defcustom' and other forms that call `defvar' as a subroutine.
2408
2409 *** New function `special-variable-p' to check whether a variable is
2410 declared as dynamically bound.
2411
2412 *** The form ((lambda ...) ...) is deprecated.
2413
2414 ** An Emacs Lisp testing tool is now included.
2415 Emacs Lisp developers can use this tool to write automated tests for
2416 their code. See the ERT info manual for details.
2417
2418 ** Changes for bidirectional display and editing
2419
2420 *** New function `current-bidi-paragraph-direction'.
2421 This returns the base direction of the paragraph at point.
2422
2423 *** New function `bidi-string-mark-left-to-right'.
2424 Given a string containing characters from right-to-left scripts, this
2425 function returns another string which can be safely inserted into a
2426 buffer, such that any following text will be always displayed to the
2427 right of that string. (This works by appending an invisible Unicode
2428 "LEFT-TO-RIGHT MARK" character if the argument string might need it.)
2429
2430 This is useful when the buffer has overall left-to-right paragraph
2431 direction and you need to insert a string whose contents are not known
2432 in advance, without disrupting the layout of the line.
2433
2434 ** Window changes
2435
2436 *** Window tree functions are accessible in Elisp.
2437 Functions are provided to return the parent, siblings or child windows
2438 of any window including internal windows (windows not associated with a
2439 buffer) in the window tree.
2440
2441 **** New function `window-valid-p' gives non-nil for live and internal
2442 windows.
2443
2444 **** Window manipulation can deal with internal windows.
2445 Many window handling functions like `split-window', `delete-window', or
2446 `delete-other-windows' as well as the window resizing functions can now
2447 act on any window including internal ones.
2448
2449 *** window-total-height/-width vs window-body-height/-width.
2450 The function `window-height' has been renamed to `window-total-height'
2451 and `window-width' has been renamed to `window-body-width'. The old
2452 names are provided as aliases. Two new functions `window-total-width'
2453 and `window-body-height' are provided.
2454
2455 *** Window parameters specific to window handling functions.
2456 For each window you can specify a parameter to override the default
2457 behavior of a number of functions like `split-window', `delete-window'
2458 and `delete-other-windows'. The variable `ignore-window-parameters'
2459 allows to ignore processing such parameters.
2460
2461 *** New semantics of third argument of `split-window'.
2462 The third argument of `split-window' has been renamed to SIDE and can be
2463 set to any of the values 'below, 'right, 'above, or 'left to make the
2464 new window appear on the corresponding side of the window that shall be
2465 split. Any other value of SIDE will cause `split-window' to split the
2466 window into two side-by-side windows as before.
2467
2468 *** Window resizing functions.
2469 A new standard function for resizing windows called `window-resize' has
2470 been introduced. This and all other functions for resizing windows no
2471 longer delete any windows when they become too small.
2472
2473 *** Deleting the selected window now selects the most recently selected
2474 live window on that frame instead.
2475
2476 *** `adjust-window-trailing-edge' adjustments.
2477 `adjust-window-trailing-edge' can now deal with fixed-size windows and
2478 is able to resize other windows if a window adjacent to the trailing
2479 edge cannot be shrunk any more. This makes its behavior more similar to
2480 that of Emacs 21 without compromising, however, its inability to delete
2481 windows which was introduced in Emacs 22.
2482
2483 *** Window-local buffer lists.
2484 Windows now have local buffer lists. This means that removing a buffer
2485 from display in a window will preferably show the buffer previously
2486 shown in that window with its previous window-start and window-point
2487 positions. This also means that the same buffer may be automatically
2488 shown twice even if it already appears in another window.
2489
2490 *** `switch-to-buffer' has a new optional argument FORCE-SAME-WINDOW,
2491 which if non-nil requires the buffer to be displayed in the currently
2492 selected window, signaling an error otherwise. If nil, another window
2493 can be used, e.g. if the selected one is strongly dedicated.
2494
2495 *** `split-window-vertically' and `split-window-horizontally' renamed
2496 to `split-window-below' and `split-window-right' respectively.
2497 The old names are kept as aliases.
2498
2499 *** Display actions
2500
2501 **** The second arg to `display-buffer' and `pop-to-buffer' is now
2502 named ACTION, and takes a display action of the same form as
2503 `display-buffer-base-action' (see Changes, above). A non-nil,
2504 non-list value is treated specially, as the old meaning.
2505
2506 **** New variable `display-buffer-overriding-action'.
2507
2508 **** The procedure of `display-buffer' etc. to choose a window is
2509 determined by combining `display-buffer-overriding-action',
2510 `display-buffer-alist', the ACTION arg, `display-buffer-base-action',
2511 and `display-buffer-fallback-action'. The second and fourth of these
2512 are user-customizable variables.
2513
2514 See the docstring of `display-buffer' for details.
2515
2516 *** New functions `window-state-get' and `window-state-put'.
2517 These functions allow to save and restore the state of an arbitrary
2518 frame or window as an Elisp object.
2519
2520 ** Completion
2521
2522 *** New variable `completion-extra-properties' used to specify extra
2523 properties of the current completion:
2524 - :annotate-function, same as the old completion-annotate-function.
2525 - :exit-function, function to call after completion took place.
2526
2527 *** Functions on `completion-at-point-functions' can return any of the
2528 properties valid for `completion-extra-properties'.
2529
2530 *** `completion-annotate-function' is obsolete.
2531
2532 *** New `metadata' method for completion tables. The metadata thus returned
2533 can specify various details of the data returned by `all-completions':
2534 - `category' is the kind of objects returned (e.g., `buffer', `file', ...),
2535 used to select a style in completion-category-overrides.
2536 - `annotation-function' to add annotations in *Completions*.
2537 - `display-sort-function' to specify how to sort entries in *Completions*.
2538 - `cycle-sort-function' to specify how to sort entries when cycling.
2539
2540 *** `minibuffer-local-filename-must-match-map' is not used any more.
2541 Instead, the bindings in `minibuffer-local-filename-completion-map'
2542 are combined with `minibuffer-local-must-match-map'.
2543
2544 *** New variable `completing-read-function' allows overriding the
2545 behavior of `completing-read'.
2546
2547 ** `glyphless-char-display' can now distinguish between graphical and
2548 text terminal display, via a char-table entry that is a cons cell.
2549
2550 ** `pre-command-hook'/`post-command-hook' are not reset to nil on error.
2551 Instead, the offending function is removed.
2552
2553 ** New hook types
2554
2555 *** New function `run-hook-wrapped' for running an abnormal hook by
2556 passing the hook functions as arguments to a "wrapping" function.
2557 Like `run-hook-with-args-until-success', it stops at the first
2558 non-nil return value.
2559
2560 *** New macro `with-wrapper-hook' for running an abnormal hook as a
2561 set of "wrapping" filters, similar to around advice.
2562 (A version of this macro was actually added in Emacs 23.2 but was not
2563 advertised at the time.)
2564
2565 ** Debugger changes
2566
2567 *** New macro `condition-case-unless-debug' (this was actually added in
2568 Emacs 23.1 as condition-case-no-debug, but not advertised)
2569
2570 *** The macro `with-demoted-errors' was added in Emacs 23.1, but not advertised.
2571
2572 *** Variable `stack-trace-on-error' removed.
2573
2574 *** The debugger can now "continue" from an error, which means it will
2575 jump to the error handler as if the debugger had not been invoked
2576 instead of jumping all the way to the top-level.
2577
2578 *** Set `debug-on-event' to enter the debugger on events like SIGUSR1.
2579 This can be useful when `inhibit-quit' is set.
2580
2581 ** The new function `server-eval-at' allows evaluation of Lisp forms on
2582 named Emacs server instances.
2583
2584 ** `call-process' and `call-process-region' allow a `(:file "file")' spec
2585 to redirect STDOUT to a file.
2586
2587 ** The function `format-time-string' now supports the %N directive,
2588 for higher-resolution time stamps.
2589
2590 ** New input reading functions
2591
2592 *** New function `read-char-choice' reads a restricted set of
2593 characters, discarding any inputs not inside the set.
2594
2595 *** The command `read-color' now requires a match for a color name
2596 or RGB triplet, instead of signaling an error if the user provides
2597 invalid input.
2598
2599 **** `facemenu-read-color' is now an alias for `read-color'.
2600
2601 ** `image-library-alist' is renamed to `dynamic-library-alist'.
2602 The variable is now used to load all kind of supported dynamic libraries,
2603 not just image libraries. The previous name is still available as an
2604 obsolete alias.
2605
2606 ** Syntax parsing changes
2607
2608 *** New variable `syntax-propertize-function'.
2609 This replaces `font-lock-syntactic-keywords' which is now obsolete.
2610 This allows syntax-table properties to be set independently from font-lock:
2611 just call syntax-propertize to make sure the text is propertized.
2612 Together with this new variable come a new hook
2613 syntax-propertize-extend-region-functions, as well as two helper functions:
2614 syntax-propertize-via-font-lock to reuse old font-lock-syntactic-keywords
2615 as-is; and syntax-propertize-rules which provides a new way to specify
2616 syntactic rules.
2617
2618 *** Syntax tables support a new "comment style c" additionally to style b.
2619
2620 ** New hook `post-self-insert-hook', run after `self-insert-command'.
2621
2622 ** frame-local variables cannot be let-bound any more.
2623
2624 ** Major and minor mode changes
2625
2626 *** `set-auto-mode' now respects mode: local variables at the end of files,
2627 as well as those in the -*- line.
2628
2629 *** `prog-mode' is a new major mode from which programming modes
2630 should be derived.
2631
2632 **** `prog-mode-hook' can be used to enable features for programming
2633 modes, e.g. (add-hook 'prog-mode-hook 'flyspell-prog-mode) to enable
2634 on-the-fly spell checking for comments and strings.
2635
2636 *** New hook `change-major-mode-after-body-hook', run by
2637 `run-mode-hooks' just before any other mode hooks.
2638
2639 *** Enabled globalized minor modes can be disabled in specific major modes.
2640 If the global mode is global-FOO-mode, then run (FOO-mode -1) in the
2641 major mode's hook, where FOO-mode toggles the mode on a per-buffer basis.
2642
2643 *** `define-minor-mode' accepts new keywords :variable, :after-hook.
2644
2645 ** File-handling changes
2646
2647 *** `delete-file' and `delete-directory' now accept optional arg TRASH.
2648 Trashing is performed if TRASH and `delete-by-moving-to-trash' are
2649 both non-nil. Interactively, TRASH defaults to t, unless a prefix
2650 argument is supplied (see Trash changes, above).
2651
2652 *** New file predicates: `file-equal-p', `file-in-directory-p'.
2653
2654 ** Tool-bars can display separators.
2655 Tool-bar separators are handled like menu separators in menu-bar maps,
2656 i.e. via menu entries of the form `(menu-item "--")'.
2657
2658 ** Image API
2659
2660 *** Animated images support (currently animated gifs only).
2661
2662 **** `image-animated-p' returns non-nil if an image can be animated.
2663
2664 **** `image-animate' animates a supplied image spec.
2665
2666 **** `image-animate-timer' returns the timer object for an image that
2667 is being animated.
2668
2669 *** `image-extension-data' has been renamed to `image-metadata'.
2670 The old name is an obsolete alias to the new one.
2671
2672 *** Image mode can view any image type that ImageMagick supports.
2673 This requires Emacs to be built with ImageMagick support.
2674
2675 **** New function `imagemagick-types', defined if ImageMagick support
2676 is enabled, returns a list of image file extensions that your
2677 ImageMagick installation supports.
2678
2679 **** New function `imagemagick-register-types' enables ImageMagick
2680 image types in Image mode and in `create-image' and other helper
2681 functions.
2682
2683 **** New option `imagemagick-types-inhibit' excludes certain
2684 ImageMagick image types from `imagemagick-register-types'.
2685
2686 **** With ImageMagick support, there are extra Image mode commands to
2687 resize and rotate images: `image-transform-fit-to-height',
2688 `image-transform-fit-to-width', `image-transform-set-rotation', and
2689 `image-transform-set-scale'.
2690
2691 ** `compose-mail' now accepts an optional 8th arg, RETURN-ACTION, and
2692 passes it to the mail user agent function. This argument specifies an
2693 action for returning to the caller after finishing with the mail. For
2694 example, this is used by Rmail to optionally delete a mail window.
2695
2696 ** XML and HTML parsing
2697 If Emacs is compiled with libxml2 support, there are two new
2698 functions: `libxml-parse-html-region' (which parses "real world" HTML)
2699 and `libxml-parse-xml-region' (which parses XML). Both return an
2700 Emacs Lisp parse tree.
2701
2702 ** Networking and encryption changes
2703
2704 *** `open-network-stream' can now be used to open an encrypted stream.
2705 It now accepts an optional `:type' parameter for initiating a TLS
2706 connection, directly or via STARTTLS. To do STARTTLS, additional
2707 parameters (`:end-of-command', `:success', `:capabilities-command')
2708 must also be supplied.
2709
2710 *** New library gnutls.el.
2711 The new function `gnutls-available-p' returns non-nil if Emacs is
2712 built with GnuTLS support. The main entry points are
2713 `open-gnutls-stream' and `gnutls-negotiate'. It's easiest to use
2714 these functions through `open-network-stream', because that can
2715 upgrade connections through STARTTLS opportunistically or use plain
2716 SSL, depending on your needs. For debugging, set `gnutls-log-level'
2717 greater than 0.
2718
2719 *** New primitive `secure-hash' that supports many secure hash algorithms:
2720 md5, sha1, sha2, sha224, sha256, sha384, and sha512. The lisp library
2721 sha1.el has been removed. The `sha1' feature is provided by default.
2722
2723 ** Isearch
2724
2725 *** New hook `isearch-update-post-hook' that runs in `isearch-update'.
2726
2727 ** Progress reporters can now "spin".
2728 The MIN-VALUE and MAX-VALUE arguments of `make-progress-reporter' can
2729 now be nil, or omitted. This makes a "non-numeric" reporter. Each
2730 time you call `progress-reporter-update' on that progress reporter,
2731 with a nil or omitted VALUE argument, the reporter message is
2732 displayed with a "spinning bar".
2733
2734 ** New variable `revert-buffer-in-progress-p' is true while a buffer is
2735 being reverted, even if the buffer has a local `revert-buffer-function'.
2736
2737 ** New variables `delayed-warnings-list' and `delayed-warnings-hook'.
2738 If delayed-warnings-list is non-nil, the command loop calls
2739 `delayed-warnings-hook' after `post-command-hook'. At present, this
2740 is only used by Emacs on some platforms to display warnings during
2741 startup, which might otherwise not be noticed. This uses the
2742 functions `display-delayed-warnings' and `collapse-delayed-warnings'.
2743
2744 ** rx.el has a new `group-n' construct for explicitly numbered groups.
2745
2746 ** New function `make-composed-keymap' that constructs a new keymap
2747 from multiple input maps. You can use this to make a keymap that
2748 inherits from multiple maps, eg:
2749 (set-keymap-parent newmap (make-composed-keymap othermap parent))
2750
2751 ** New function `string-prefix-p'.
2752 (This was actually added in Emacs 23.2 but was not advertised at the time.)
2753
2754 ** New reader macro ## that stands for the empty symbol.
2755 This means that the empty symbol can now be read back. Also, #: by itself
2756 (when not immediately followed by a possible symbol character) stands for
2757 an empty uninterned symbol.
2758
2759 ** New math functions `isnan', `copysign', `frexp', `ldexp'.
2760
2761 ** The following functions and variables are obsolete:
2762
2763 *** `tooltip-use-echo-area' is obsolete.
2764 Rather than setting this to t, disable Tooltip mode instead.
2765
2766 *** buffer-substring-filters is obsolete.
2767 Use `filter-buffer-substring-functions' instead.
2768
2769 *** `byte-compile-disable-print-circle' is obsolete.
2770
2771 *** `deferred-action-list' and `deferred-action-function' are obsolete.
2772 Use `post-command-hook' instead.
2773
2774 *** `font-lock-maximum-size' is obsolete.
2775
2776 \f
2777 * Changes in Emacs 24.1 on Non-Free Operating Systems
2778
2779 ** On MS Windows, Emacs warns when using the obsolete init file _emacs,
2780 and also when HOME is set to C:\ by default.
2781
2782 ** New configure.bat options
2783
2784 *** --enable-checking builds Emacs with extra runtime checks.
2785
2786 *** --distfiles specifies files to be included in binary distribution.
2787
2788 *** --without-gnutls disables automatic GnuTLS detection.
2789
2790 *** --lib for general library linkage, works with the USER_LIBS build variable.
2791
2792 ** New make target `dist' to create binary distribution for MS Windows.
2793
2794 ** The Lisp function `w32-default-color-map' is now obsolete.
2795 (It is only used internally in the Emacs C code.)
2796
2797 ** Customize ns-auto-hide-menu-bar to have the menu-bar hidden, but
2798 reappear on mouse-over. (Requires OS X 10.6 or later.)
2799
2800 ** On Mac OS X, dragging a file into Emacs visits the file, like on
2801 other platforms, rather than inserting its contents into the buffer.
2802
2803 \f
2804 ----------------------------------------------------------------------
2805 This file is part of GNU Emacs.
2806
2807 GNU Emacs is free software: you can redistribute it and/or modify
2808 it under the terms of the GNU General Public License as published by
2809 the Free Software Foundation, either version 3 of the License, or
2810 (at your option) any later version.
2811
2812 GNU Emacs is distributed in the hope that it will be useful,
2813 but WITHOUT ANY WARRANTY; without even the implied warranty of
2814 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2815 GNU General Public License for more details.
2816
2817 You should have received a copy of the GNU General Public License
2818 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2819
2820 \f
2821 Local variables:
2822 mode: outline
2823 paragraph-separate: "[ \f]*$"
2824 end: