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1 GNU Emacs NEWS -- history of user-visible changes.
2
3 Copyright (C) 2010-2012 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
18 Temporary note:
19 +++ indicates that the appropriate manual has already been updated.
20 --- means no change in the manuals is called for.
21 When you add a new item, please add it without either +++ or ---
22 so we will look at it and add it to the manual.
23
24 \f
25 * Installation Changes in Emacs 24.1
26
27 ---
28 ** Emacs can be compiled with Gtk+ 3.0 if you pass --with-x-toolkit=gtk3
29 to configure. Note that other libraries used by Emacs, RSVG and GConf,
30 also depend on Gtk+. You can disable them with --without-rsvg and
31 --without-gconf.
32
33 ---
34 ** Emacs can be compiled with GnuTLS support.
35 This happens by default if a suitably recent version of the library is
36 found at build time. To prevent this, use the configure option
37 `--without-gnutls'. See below for GnuTLS features.
38
39 ---
40 ** Emacs can be compiled with SELinux support.
41 This happens by default if a suitably recent version of the library is
42 found at build time. To prevent this, use the configure option
43 `--without-selinux'. See below for SELinux features.
44
45 ---
46 ** Emacs can be compiled with ImageMagick support.
47 This happens by default if a suitably recent version of the library is
48 found at build time. To prevent this, use the configure option
49 `--without-imagemagick'. See below for ImageMagick features.
50 This feature is not available for the Nextstep or MS ports.
51
52 ---
53 ** Emacs can be compiled with libxml2 support.
54 This happens by default if a suitably recent version of the library is
55 found at build time. To prevent this, use the configure option
56 `--without-xml2'. See below for libxml2 features.
57
58 ---
59 ** There is a new configure option --with-wide-int.
60 With it, Emacs integers typically have 62 bits, even on 32-bit machines.
61 On 32-bit hosts, this raises the limit on buffer sizes from about 512 MiB
62 to about 2 GiB.
63
64 ---
65 ** By default, the installed Info and man pages are compressed.
66 You can disable this by configuring --without-compress-info.
67
68 ---
69 ** There are new configure options:
70 --with-mmdf, --with-mail-unlink, --with-mailhost.
71 These provide no new functionality, they just remove the need to edit
72 lib-src/Makefile by hand in order to use the associated features.
73
74 ---
75 ** There is a new configure option --enable-use-lisp-union-type.
76 This is only useful for Emacs developers to debug certain types of bugs.
77 This is not a new feature; only the configure flag is new.
78
79 ---
80 ** The standalone programs digest-doc and sorted-doc are removed.
81 Emacs now uses Lisp commands `doc-file-to-man' and `doc-file-to-info'.
82
83 ---
84 ** The standalone program `fakemail' is removed.
85 If you need it, feedmail.el provides a superset of the functionality.
86
87 \f
88 * Startup Changes in Emacs 24.1
89
90 ---
91 ** The --unibyte, --multibyte, --no-multibyte, and --no-unibyte
92 command line arguments, and the EMACS_UNIBYTE environment variable, no
93 longer have any effect. (They were declared obsolete in Emacs 23.)
94
95 +++
96 ** New command line option `--no-site-lisp' removes site-lisp directories
97 from load-path. -Q now implies this. This option does not affect the
98 EMACSLOADPATH environment variable (and hence has no effect for
99 Nextstep builds.)
100
101 \f
102 * Changes in Emacs 24.1
103
104 +++
105 ** auto-mode-case-fold is now enabled by default.
106
107 ** Completion
108
109 *** shell-mode uses pcomplete rules, with the standard completion UI.
110 +++
111 *** Many packages have been changed to use `completion-at-point'
112 rather than their own completion code.
113 +++
114 *** `completion-at-point' now handles tags and semantic completion.
115 ---
116 *** Completion in a non-minibuffer now tries to detect the end of completion
117 and pops down the *Completions* buffer accordingly.
118 +++
119 *** Completion can cycle, depending on completion-cycle-threshold.
120 +++
121 *** New completion style `substring'.
122 +++
123 *** Completion style can be set per-category `completion-category-overrides'.
124 +++
125 *** Completion of buffers now uses substring completion by default.
126
127 ** Mail changes
128
129 +++
130 *** The default of `send-mail-function' is now `sendmail-query-once',
131 which asks the user (once) whether to use the smtpmail package to send
132 email, or to use the old defaults that rely on external mail
133 facilities (`sendmail-send-it' on GNU/Linux and other Unix-like
134 systems, and `mailclient-send-it' on Windows).
135
136 ---
137 *** `compose-mail' now accepts an optional 8th arg, RETURN-ACTION, and
138 passes it to the mail user agent function. This argument specifies an
139 action for returning to the caller after finishing with the mail.
140 For example, this is used by Rmail to optionally delete a mail window.
141
142 *** smtpmail
143
144 **** smtpmail now uses encrypted connections (via STARTTLS) if the
145 mail server supports them. It also uses the auth-source framework for
146 getting credentials.
147
148 **** The variable `smtpmail-auth-credentials' has been removed.
149 That variable used to have the default value "~/.authinfo", in which
150 case you won't see any difference. But if you changed it to be a list
151 of user names and passwords, that setting is now ignored; you will be
152 prompted for the user name and the password, which will then be saved
153 to ~/.authinfo. (To control where and how the credentials are stored,
154 see the auth-source manual. You may want to change the auth-source
155 preferences if you want to store the credentials encrypted, for
156 instance.)
157
158 You can also manually copy the credentials to your ~/.authinfo file.
159 For example, if you had
160
161 (setq smtpmail-auth-credentials
162 '(("mail.example.org" 25 "jim" "s!cret")))
163
164 then the equivalent line in ~/.authinfo would be
165
166 machine mail.example.org port 25 login jim password s!cret
167
168 **** The variable `smtpmail-starttls-credentials' has been removed.
169
170 If you had that set, then you need to put
171
172 machine smtp.whatever.foo port 25 key "~/.my_smtp_tls.key" cert "~/.my_smtp_tls.cert"
173
174 in your ~/.authinfo file instead.
175
176 *** Mail mode changes (this is the old Mail mode, not Message mode)
177 +++
178 **** New command `mail-add-attachment' for adding MIME attachments
179 ---
180 **** The command `mail-attach-file' was renamed to `mail-insert-file'.
181 The old name is now an obsolete alias to the new name.
182
183 +++
184 *** You can type C-c m from M-x report-emacs-bug if you prefer, and if
185 your system supports it, to transfer your report to your desktop's
186 preferred mail client. This uses either the "xdg-email" utility, or
187 OS X's "open" command.
188
189 ** Emacs server and client changes
190 +++
191 *** New option `server-port' specifies the port on which the Emacs
192 server should listen.
193 +++
194 *** New emacsclient argument -q/--quiet suppresses some status messages.
195 +++
196 *** New emacsclient argument --frame-parameters can be used to set the
197 frame parameters of a newly-created graphical frame.
198 +++
199 *** If emacsclient shuts down as a result of Emacs signaling an
200 error, its exit status is 1.
201 +++
202 *** New emacsclient argument --parent-id ID.
203 This opens a client frame in parent X window ID, via XEmbed, similar
204 to the --parent-id argument to Emacs.
205
206 ** Internationalization changes
207
208 +++
209 *** Emacs now supports display and editing of bidirectional text.
210
211 Text that includes characters from right-to-left (RTL) scripts, such
212 as Arabic, Farsi, or Hebrew, is displayed in the correct visual order
213 as expected by users of those scripts. This display reordering is a
214 "Full bidirectionality" class implementation of the Unicode
215 Bidirectional Algorithm. Buffers with no RTL text should look exactly
216 the same as before.
217
218 For more information, see the node "Bidirectional Editing" in the
219 Emacs Manual.
220
221 +++
222 **** New buffer-local variable `bidi-display-reordering'.
223 To disable display reordering in any given buffer, change this to nil.
224
225 +++
226 **** New buffer-local variable `bidi-paragraph-direction'.
227 If nil (the default), Emacs determines the base direction of each
228 paragraph from its text, as specified by the Unicode Bidirectional
229 Algorithm.
230
231 Setting this to `right-to-left' or `left-to-right' forces a particular
232 base direction on each paragraph in the buffer.
233
234 Paragraphs whose base direction is right-to-left are displayed
235 starting at the right margin of the window.
236
237 +++
238 *** Enhanced support for characters with no glyphs in available fonts.
239 If a character has no glyphs in any of the available fonts, Emacs
240 normally displays it either as a hexadecimal code in a box or as a
241 thin 1-pixel space. In addition to these two methods, Emacs can
242 display these characters as empty box, as an acronym, or not display
243 them at all. To change how these characters are displayed, customize
244 the variable `glyphless-char-display-control'.
245
246 On character terminals, these methods are used for characters that
247 cannot be encoded by the `terminal-coding-system'.
248
249 ---
250 *** New input methods for Farsi: farsi and farsi-translit.
251
252 +++
253 *** `nobreak-char-display' now also highlights Unicode hyphen chars
254 (U+2010 and U+2011).
255
256 ---
257 *** New translation of the Emacs Tutorial in Hebrew is available.
258 Type `C-u C-h t' to choose it in case your language setup doesn't
259 automatically select it.
260
261 ** Improved GTK integration
262 +++
263 *** GTK scroll-bars are now placed on the right by default.
264 Use `set-scroll-bar-mode' to change this.
265 +++
266 *** GTK tool bars can have just text, just images or images and text.
267 Customize `tool-bar-style' to choose style. On a Gnome desktop, the default
268 is taken from the desktop settings.
269 ---
270 *** GTK tool bars can be placed on the left/right or top/bottom of the frame.
271 The frame-parameter tool-bar-position controls this. It takes the values
272 top, left, right or bottom. The Options => Show/Hide menu has entries
273 for this.
274 +++
275 *** The colors for selected text (the `region' face) are taken from
276 the GTK theme when Emacs is built with GTK.
277 +++
278 *** Emacs uses GTK tooltips by default if built with GTK. You can turn that
279 off by customizing x-gtk-use-system-tooltips.
280
281 +++
282 ** New basic faces `error', `warning', `success' are available to
283 highlight strings that indicate failure, caution or successful operation.
284
285 ---
286 ** Lucid menus and dialogs can display antialiased fonts if Emacs is built
287 with Xft. To change font, use the X resource font, for example:
288 Emacs.pane.menubar.font: Courier-12
289
290 +++
291 ** On graphical displays, the mode-line no longer ends in dashes.
292 Also, the first dash (which does not indicate anything) is just
293 displayed as a space.
294
295 +++
296 ** Basic SELinux support has been added.
297 This requires Emacs to be linked with libselinux at build time.
298
299 +++
300 *** Emacs preserves the SELinux file context when backing up, and
301 optionally when copying files. To this end, copy-file has an extra
302 optional argument, and backup-buffer and friends include the SELinux
303 context in their return values.
304
305 +++
306 *** The new functions file-selinux-context and set-file-selinux-context
307 get and set the SELinux context of a file.
308
309 ** Changes for exiting Emacs
310 +++
311 *** The function kill-emacs is now run upon receipt of the signals
312 SIGTERM and SIGHUP, and upon SIGINT in batch mode.
313 +++
314 *** kill-emacs-hook is now also run in batch mode.
315 If you have code that adds something to kill-emacs-hook, you should
316 consider if it is still appropriate to add it in the noninteractive case.
317
318 ** Scrolling changes
319 +++
320 *** New scrolling commands `scroll-up-command' and `scroll-down-command'
321 (bound to C-v/[next] and M-v/[prior]) do not signal errors at top/bottom
322 of buffer at first key-press (instead move to top/bottom of buffer)
323 when `scroll-error-top-bottom' is non-nil.
324 +++
325 *** New variable `scroll-error-top-bottom' (see above).
326 +++
327 *** New scrolling commands `scroll-up-line' and `scroll-down-line'
328 scroll a line instead of full screen.
329 +++
330 *** New property `scroll-command' should be set on a command's symbol to
331 define it as a scroll command affected by `scroll-preserve-screen-position'.
332 +++
333 *** If you customize `scroll-conservatively' to a value greater than 100,
334 Emacs will never recenter point in the window when it scrolls due to
335 cursor motion commands or commands that move point (e.f., `M-g M-g').
336 Previously, you needed to use `most-positive-fixnum' as the value of
337 `scroll-conservatively' to achieve the same effect.
338 ---
339 *** ``Aggressive'' scrolling now honors the scroll margins.
340 If you customize `scroll-up-aggressively' or
341 `scroll-down-aggressively' and move point off the window, Emacs now
342 scrolls the window so as to avoid positioning point inside the scroll
343 margin.
344
345 ** Trash changes
346 +++
347 *** `delete-by-moving-to-trash' now only affects commands that specify
348 trashing. This avoids inadvertently trashing temporary files.
349 +++
350 *** Calling `delete-file' or `delete-directory' with a prefix argument
351 now forces true deletion, regardless of `delete-by-moving-to-trash'.
352
353 +++
354 ** New option `list-colors-sort' defines the color sort order
355 for `list-colors-display'.
356
357 ** An Emacs Lisp package manager is now included.
358 This is a convenient way to download and install additional packages,
359 from a package repository at http://elpa.gnu.org.
360 +++
361 *** `M-x list-packages' shows a list of packages, which can be
362 selected for installation.
363 +++
364 *** New command `describe-package', bound to `C-h P'.
365 +++
366 *** By default, all installed packages are loaded and activated
367 automatically when Emacs starts up. To disable this, set
368 `package-enable-at-startup' to nil. To change which packages are
369 loaded, customize `package-load-list'.
370
371 ** Custom Themes
372 +++
373 *** `M-x customize-themes' lists Custom themes which can be enabled.
374 +++
375 *** New option `custom-theme-load-path' is the load path for themes.
376 Emacs no longer looks for custom themes in `load-path'. The default
377 is to search in `custom-theme-directory', followed by a built-in theme
378 directory named "themes/" in `data-directory'.
379 +++
380 *** New option `custom-safe-themes' records known-safe theme files.
381 If a theme is not in this list, Emacs queries before loading it, and
382 offers to save the theme to `custom-safe-themes' automatically. By
383 default, all themes included in Emacs are treated as safe.
384
385 ** File- and directory-local variable changes
386 +++
387 *** You can stop directory local vars from applying to subdirectories.
388 Add an element (subdirs . nil) to the alist portion of any variables
389 settings to indicate that the section should not apply to
390 subdirectories.
391 +++
392 *** Directory local variables can apply to some file-less buffers.
393 Affected modes include dired, vc-dir, and log-edit. For example,
394 adding "(diff-mode . ((mode . whitespace)))" to .dir-locals.el will
395 turn on `whitespace-mode' for *vc-diff* buffers. Modes should call
396 `hack-dir-local-variables-non-file-buffer' to support this.
397 +++
398 *** Using "mode: MINOR-MODE" to enable a minor mode is deprecated.
399 Instead, use "eval: (minor-mode 1)".
400
401 +++
402 *** The variable `inhibit-first-line-modes-regexps' has been renamed
403 to `inhibit-local-variables-regexps'. As the name suggests, it now
404 applies to ALL file local variables, not just -*- mode ones.
405 The associated `inhibit-first-line-modes-suffixes' has been renamed
406 in the corresponding way.
407
408 +++
409 ** The variable `focus-follows-mouse' now always defaults to nil.
410
411 +++
412 ** New primitive `secure-hash' that supports many secure hash algorithms:
413 md5, sha1, sha2, sha224, sha256, sha384, and sha512. The lisp library
414 sha1.el has been removed. The `sha1' feature is provided by default.
415
416 ** Menu-bar changes
417 ---
418 *** `menu-bar-select-buffer-function' lets you choose another operation
419 instead of `switch-to-buffer' when selecting an item in the Buffers menu.
420
421 ** Window changes
422
423 +++
424 *** Resizing an Emacs frame now preserves proportional window sizes,
425 modulo restrictions like window minimum sizes and fixed-size windows.
426
427 *** The behavior of `display-buffer' is now customizable in detail.
428 +++
429 **** New option `display-buffer-base-action' specifies a list of
430 user-determined display "actions" (functions and optional arguments
431 for choosing the displaying window).
432
433 This takes precedence over the default display action, which is
434 specified by `display-buffer-fallback-action'.
435
436 +++
437 **** New option `display-buffer-alist' maps buffer name regexps to
438 display actions, taking precedence over `display-buffer-base-action'.
439
440 +++
441 *** New option `window-combination-limit'.
442 The new option `window-combination-limit' allows to return the space
443 obtained for resizing or creating a window more reliably to the window
444 from which such space was obtained.
445
446 +++
447 *** New option `window-combination-resize'.
448 The new option `window-combination-resize' allows to split a window that
449 otherwise cannot be split because it's too small by stealing space from
450 other windows in the same combination. Subsequent resizing or deletion
451 of the window will resize all windows in the same combination as well.
452
453 +++
454 *** New commands `maximize-window' and `minimize-window'.
455 These maximize and minimize the size of a window within its frame.
456
457 +++
458 *** New commands `switch-to-prev-buffer' and `switch-to-next-buffer'.
459 These functions allow to navigate through the live buffers that have
460 been shown in a specific window.
461
462 +++
463 ** The inactive minibuffer has its own major mode `minibuffer-inactive-mode'.
464 This is handy for minibuffer-only frames, and is also used for the feature
465 where mouse-1 pops up *Messages*"', which can now easily be changed.
466
467 \f
468 * Editing Changes in Emacs 24.1
469
470 ** Search changes
471 +++
472 *** C-y in Isearch is now bound to isearch-yank-kill, instead of
473 isearch-yank-line.
474 +++
475 *** M-y in Isearch is now bound to isearch-yank-pop, instead of
476 isearch-yank-kill.
477 +++
478 *** M-s C-e in Isearch is now bound to isearch-yank-line.
479
480 +++
481 ** New commands `count-words-region' and `count-words'.
482
483 *** `count-lines-region' is now an alias for `count-words-region',
484 bound to M-=, which shows the number of lines, words, and characters.
485
486 +++
487 ** The default value of `backup-by-copying-when-mismatch' is now t.
488
489 +++
490 ** The command `just-one-space' (M-SPC), if given a negative argument,
491 also deletes newlines around point.
492
493 ** Deletion changes
494 +++
495 *** New option `delete-active-region'.
496 If non-nil, [delete] and DEL delete the region if it is active and no
497 prefix argument is given. If set to `kill', these commands kill
498 instead.
499 +++
500 *** New command `delete-forward-char', bound to [delete].
501 This is meant for interactive use, and obeys `delete-active-region'.
502 The command `delete-char' does not obey `delete-active-region'.
503 ---
504 *** `delete-backward-char' is now a Lisp function.
505 Apart from obeying `delete-active-region', its behavior is unchanged.
506 However, the byte compiler now warns if it is called from Lisp; you
507 should use delete-char with a negative argument instead.
508 ---
509 *** The option `mouse-region-delete-keys' has been deleted.
510
511 ** Selection changes.
512
513 The default handling of clipboard and primary selections was changed
514 to conform with modern X applications. In short, most commands for
515 killing and yanking text now use the clipboard, while mouse commands
516 use the primary selection.
517
518 In the following, we provide a list of these changes, followed by a
519 list of steps to get the old behavior back if you prefer that.
520
521 +++
522 *** `select-active-regions' now defaults to t.
523 Merely selecting text (e.g. with drag-mouse-1) no longer puts it in
524 the kill ring. The selected text is put in the primary selection, if
525 the system possesses a separate primary selection facility (e.g. X).
526
527 +++
528 **** `select-active-regions' also accepts a new value, `only'.
529 This means to only set the primary selection for temporarily active
530 regions (usually made by mouse-dragging or shift-selection);
531 "ordinary" active regions, such as those made with C-SPC followed by
532 point motion, do not alter the primary selection.
533
534 ---
535 **** `mouse-drag-copy-region' now defaults to nil.
536
537 +++
538 *** mouse-2 is now bound to `mouse-yank-primary'.
539 This pastes from the primary selection, ignoring the kill-ring.
540 Previously, mouse-2 was bound to `mouse-yank-at-click'.
541
542 +++
543 *** `x-select-enable-clipboard' now defaults to t on all platforms.
544 +++
545 *** `x-select-enable-primary' now defaults to nil.
546 Thus, commands that kill text or copy it to the kill-ring (such as
547 M-w, C-w, and C-k) also use the clipboard---not the primary selection.
548
549 ---
550 **** The "Copy", "Cut", and "Paste" items in the "Edit" menu are now
551 exactly equivalent to, respectively M-w, C-w, and C-y.
552
553 ---
554 **** Note that on MS-Windows, `x-select-enable-clipboard' was already
555 non-nil by default, as Windows does not support the primary selection
556 between applications.
557
558 ---
559 *** To return to the previous behavior, do the following:
560 **** Change `select-active-regions' to nil.
561 **** Change `mouse-drag-copy-region' to t.
562 **** Change `x-select-enable-primary' to t (on X only).
563 **** Change `x-select-enable-clipboard' to nil.
564 **** Bind `mouse-yank-at-click' to mouse-2.
565
566 +++
567 *** Support for X cut buffers has been removed.
568
569 *** X clipboard managers are now supported.
570 To inhibit this, change `x-select-enable-clipboard-manager' to nil.
571
572 +++
573 ** New command `rectangle-number-lines', bound to `C-x r N', numbers
574 the lines in the current rectangle. With a prefix argument, this
575 prompts for a number to count from and for a format string.
576
577 +++
578 ** The default value of redisplay-dont-pause is now t
579 This makes Emacs feel more responsive to editing commands that arrive
580 at high rate, e.g. if you lean on some key, because stopping redisplay
581 in the middle (when this variable is nil) forces more expensive
582 updates later on, and Emacs appears to be unable to keep up.
583
584 +++
585 ** The behavior of <TAB> for active regions in Text mode has changed.
586 In Text and related modes, typing <TAB> (`indent-for-tab-command')
587 when the region is active causes Emacs to indent all the lines in the
588 region, aligning them with the line previous to the first line in the
589 region (or with the left margin if there is no previous line).
590
591 \f
592 * Changes in Specialized Modes and Packages in Emacs 24.1
593
594 +++
595 ** Archive Mode has basic support for browsing and updating 7z archives.
596
597 ** BibTeX mode
598 ---
599 *** BibTeX mode now supports biblatex.
600 Use the variable bibtex-dialect to select different BibTeX dialects.
601 bibtex-entry-field-alist is now an obsolete alias forbibtex-BibTeX-entry-alist.
602 ---
603 *** New command `bibtex-search-entries' bound to C-c C-a.
604 ---
605 *** New `bibtex-entry-format' option `sort-fields', disabled by default.
606 ---
607 *** New variable `bibtex-search-entry-globally'.
608
609 ** Calendar, Diary, and Appt
610
611 +++
612 *** Diary entries can contain non-printing `comments'.
613 See the variable `diary-comment-start'.
614
615 +++
616 *** Appointments can specify their individual warning times.
617 See the variable `appt-warning-time-regexp'.
618
619 ---
620 *** The function specified by `appt-disp-window-function' may be passed
621 lists of arguments if multiple appointments are due at similar times.
622 If you are using a custom function for this, you should update it.
623
624 +++
625 *** New function `diary-hebrew-birthday'.
626
627 ---
628 *** Elements of `calendar-day-abbrev-array' and `calendar-month-abbrev-array'
629 may no longer be nil, but must all be strings.
630
631 ---
632 *** The obsolete (since Emacs 22.1) method of enabling the appt package
633 by adding appt-make-list to diary-hook has been removed. Use appt-activate.
634
635 ---
636 *** Some appt variables (obsolete since Emacs 22.1) have been removed:
637 appt-issue-message (use the function appt-activate)
638 appt-visible/appt-msg-window (use the variable appt-display-format)
639
640 ---
641 *** Some diary function aliases (obsolete since Emacs 22.1) have been removed:
642 view-diary-entries, list-diary-entries, show-all-diary-entries
643
644 ** Browse-url
645
646 +++
647 *** New option `browse-url-mailto-function' specifies how to handle "mailto:"s.
648
649 ---
650 *** The default browser used by the package is now the "xdg-open" program,
651 on platforms that support it. This calls your desktop's preferred browser.
652
653 +++
654 ** New CC Mode feature to "guess" the style in an existing buffer.
655 The main entry is M-x c-guess.
656
657 ** comint and modes derived from it use the generic completion code.
658
659 ** Compilation mode
660 ---
661 *** Compilation mode can be used without font-lock-mode.
662 `compilation-parse-errors-function' is now obsolete.
663
664 ---
665 *** New variable `compilation-filter-start', bound while
666 compilation-filter-hook runs. It records the start position of the
667 text inserted by compilation-filter.
668
669 ---
670 *** `compilation-error-screen-columns' and `compilation-first-column'
671 are obeyed in the editing buffer. So programming language modes can
672 set them, whereas previously only the value in the *compilation* buffer
673 was used.
674
675 ** Customize
676
677 +++
678 *** Customize buffers now contain a search field.
679 The search is performed using `customize-apropos'.
680 To turn off the search field, set custom-search-field to nil.
681
682 +++
683 *** Custom options now start out hidden if at their default values.
684 Use the arrow to the left of the option name to toggle visibility.
685
686 ---
687 *** custom-buffer-sort-alphabetically now defaults to t.
688
689 +++
690 *** The color widget now has a "Choose" button, which allows you to
691 choose a color via list-colors-display.
692
693 ** D-Bus
694
695 *** It is now possible to access buses other than the default system
696 or session bus.
697
698 *** The dbus-register-method and dbus-register-property functions
699 optionally do not register names.
700
701 *** The new function dbus-register-service registers a known service name
702 on a D-Bus without simultaneously registering a property or a method.
703
704 ** Dired-x
705 ---
706 *** dired-jump and dired-jump-other-window called with a prefix argument
707 read a file name from the minibuffer instead of using buffer-file-name.
708
709 +++
710 *** The `dired local variables' feature provided by Dired-x is obsolete.
711 The standard directory local variables feature replaces it.
712
713 ** ERC changes
714
715 ---
716 *** New options `erc-autojoin-timing' and `erc-autojoin-delay',
717 controlling attempts to autojoin a channel.
718
719 *** New variable `erc-coding-system-precedence': If we use `undecided'
720 as the server coding system, this variable will then be consulted.
721 The default is to decode strings that can be decoded as utf-8 as
722 utf-8, and do the normal `undecided' decoding for the rest.
723
724 ** Eshell changes
725
726 ---
727 *** The default value of `eshell-directory-name' has changed
728 to be an "eshell" directory in `user-emacs-directory'.
729 The old "~/.eshell/" directory is still used if it exists, though.
730
731 ** gdb-mi
732 +++
733 *** The GDB User Interface has been migrated to GDB Machine Interface.
734 It now supports multithread non-stop debugging and simultaneous
735 debugging of several threads.
736
737 ** Image mode
738
739 +++
740 *** RET (`image-toggle-animation') toggles animation, if applicable.
741 Animation plays once, unless the option `image-animate-loop' is non-nil.
742
743 ** Info
744
745 +++
746 *** New command `info-display-manual' displays a named Info manual.
747 If that manual is already visited in some Info buffer, it displays
748 that buffer. (This is handy if you have many manuals in many *info*
749 buffers, and don't remember the name of the buffer visiting the manual
750 you want to consult.) Otherwise, it loads and displays the manual.
751
752 +++
753 *** `e' is now bound to `end-of-buffer' rather than to `Info-edit'.
754 This is for compatibility with the stand-alone Info reader program,
755 and also because `Info-edit' is a rarely used command that is disabled
756 by default.
757
758 +++
759 ** MH-E has been upgraded to MH-E version 8.3.1.
760 See MH-E-NEWS for details.
761
762 ---
763 ** Modula-2 mode provides auto-indentation.
764
765 ---
766 ** mpc.el: Can use pseudo tags of the form tag1|tag2 as a union of two tags.
767
768 ---
769 ** Prolog mode has been completely revamped, with lots of additional
770 functionality such as more intelligent indentation, electricity, support for
771 more variants, including Mercury, and a lot more.
772
773 ** Rmail
774
775 +++
776 *** The command `rmail-epa-decrypt' decrypts OpenPGP data
777 in the Rmail incoming message.
778
779 ---
780 *** The variable `rmail-message-filter' no longer has any effect.
781 This change was made in Emacs 23.1 but was not advertised at the time.
782 Try using `rmail-show-message-hook' instead.
783
784 ** Shell mode
785 +++
786 *** Shell mode uses pcomplete rules, with the standard completion UI.
787 +++
788 *** The `shell' command prompts for the shell path name if the default
789 directory is a remote file name and neither the environment variable
790 $ESHELL nor the variable `explicit-shell-file-name' is set.
791
792 ---
793 ** SQL mode
794
795 ---
796 *** New options `sql-port', `sql-connection-alist', `sql-send-terminator',
797 and `sql-oracle-scan-on'.
798
799 ---
800 *** New custom variables control prompting for login parameters.
801 Each supported product has a custom variable `sql-*-login-params',
802 which is a list of the parameters to be prompted for before a
803 connection is established.
804
805 ---
806 *** The command `sql-product-interactive' now takes a prefix argument,
807 which causes it to prompt for an SQL product.
808
809 ---
810 *** Product-specific SQL interactive commands now take prefix arguments.
811 These commands (`sql-sqlite', `sql-postgres', `sql-mysql', etc.),
812 given a prefix argument, prompt for a name for the SQL interactive
813 buffer. This reduces the need for calling `sql-rename-buffer'.
814
815 ---
816 *** SQL interactive modes suppress command continuation prompts, and
817 replace tabs with spaces. The first change impacts multiple line SQL
818 statements entered with C-j between each line, statements yanked into
819 the buffer and statements sent with `sql-send-*' functions. The
820 second prevents the MySQL and Postgres interpreters from listing
821 object name completions when sent text via `sql-send-*' functions.
822
823 ---
824 *** New command `sql-connect' starts a predefined SQLi session,
825 using the login parameters from `sql-connection-alist'.
826
827 ---
828 *** New "Save Connection" menu item in SQLi buffers.
829 This gathers the login params specified for the SQLi session, if it
830 was not started by a connection, and saves them as a new connection.
831
832 ---
833 *** New commands for listing database objects and details:
834 sql-list-all and sql-list-table.
835
836 ---
837 *** An API for manipulating SQL product definitions has been added.
838
839 ** TeX modes
840
841 +++
842 *** latex-electric-env-pair-mode keeps \begin..\end matched on the fly.
843
844 ** Tramp
845 ---
846 *** There exists a new inline access method "ksu" (kerberized su).
847 ---
848 *** The following access methods are discontinued: "ssh1_old",
849 "ssh2_old", "scp1_old", "scp2_old", "imap", "imaps" and "fish".
850 +++
851 *** The user option `remote-file-name-inhibit-cache' controls whether
852 remote file attributes are cached for better performance.
853 ---
854 *** The option `ange-ftp-binary-file-name-regexp' has changed its
855 default value to "".
856 ---
857 *** Handlers for file-selinux-context and set-file-selinux-context for
858 remote machines that support SELinux.
859
860 +++
861 ** New function, url-queue-retrieve, fetches URLs asynchronously like
862 url-retrieve does, but in parallel.
863
864 ** VC and related modes
865
866 +++
867 *** Support for pulling on distributed version control systems.
868 `C-x v +' (`vc-pull') runs a "pull" operation, if it is supported
869 (currently with Bzr, Git, and Mercurial), to update the current branch
870 and working tree. A prefix argument means to prompt the user for
871 specifics, e.g. a pull location.
872
873 ---
874 *** `vc-update' is now an alias for `vc-pull'.
875
876 +++
877 *** Support for merging on distributed version control systems.
878 The vc-merge command now runs a "merge" operation, if it is supported
879 (currently with Bzr, Git, and Mercurial), to merge changes from
880 another branch into the current one. It prompts for specifics, e.g. a
881 merge source.
882
883 +++
884 *** New option `vc-revert-show-diff' controls whether `vc-revert'
885 shows a diff while querying the user. It defaults to t.
886
887 +++
888 *** Log entries in some Log View buffers can be toggled to display a
889 longer description by typing RET (log-view-toggle-entry-display).
890 This is currently supported for Bzr, Git, and Mercurial (to support
891 another backend, define a `log-view-expanded-log-entry-function').
892 In the Log View buffers made by `C-x v L' (vc-print-root-log), you can
893 use this to display the full log entry for the revision at point.
894
895 +++
896 *** New command `vc-ediff' allows visual comparison of two revisions
897 of a file similar to `vc-diff', but using ediff backend.
898
899 +++
900 *** The option `vc-initial-comment' was removed in Emacs 23.2, but
901 this was not advertised at the time.
902
903 +++
904 *** `vc-toggle-read-only' is an obsolete alias for `toggle-read-only'.
905 Since Emacs 23, it has done the same thing as `toggle-read-only', but
906 this was not advertised at the time.
907
908 ** Obsolete modes
909
910 ---
911 *** abbrevlist.el
912
913 ---
914 *** erc-hecomplete.el (use erc-pcomplete.el instead)
915
916 *** partial-completion-mode (complete.el) is obsolete.
917 You can get a comparable behavior with:
918 (setq completion-styles '(partial-completion initials))
919 (setq completion-pcm-complete-word-inserts-delimiters t)
920
921 ---
922 *** pc-mode.el is obsolete (CUA mode is much more comprehensive).
923
924 [FIXME gnus.texi, message.texi need updating]
925 *** pgg is obsolete (use EasyPG instead)
926
927 ---
928 *** sregex.el is obsolete, since rx.el is a strict superset.
929
930 ---
931 *** s-region.el and pc-select.el are obsolete.
932 They are superseded by shift-select-mode, enabled by default since 23.1.
933
934 +++
935 *** vc-mcvs.el is obsolete (for lack of a maintainer)
936
937 ** Miscellaneous
938
939 +++
940 *** The Landmark game is now invoked with `landmark', not `lm'.
941
942 ---
943 *** In `ido-file-completion-map', C-v is no longer bound to ido-toggle-vc.
944 (This interfered with cua-mode.)
945
946 +++
947 *** f90.el has some support for Fortran 2008 syntax.
948
949 ---
950 *** `copyright-fix-years' can optionally convert consecutive years to ranges.
951
952 +++
953 *** New command `nato-region' converts text to NATO phonetic alphabet.
954
955 \f
956 * New Modes and Packages in Emacs 24.1
957
958 +++
959 ** Occur Edit mode applies edits made in *Occur* buffers to the
960 original buffers. It is bound to "e" in Occur mode.
961
962 +++
963 ** New global minor mode electric-pair-mode.
964 When enabled, typing an open parenthesis automatically inserts the
965 matching closing one.
966
967 +++
968 ** New global minor mode electric-indent-mode.
969 When enabled, typing certain characters triggers reindentation.
970 Major modes wishing to use this can set electric-indent-chars or
971 electric-indent-functions.
972
973 +++
974 ** New global minor mode electric-layout-mode.
975 When enabled, typing certain characters automatically inserts newlines.
976 Major modes wishing to use this can set electric-layout-rules.
977
978 +++
979 ** tabulated-list.el provides a generic major mode for tabulated data,
980 from which other modes can be derived.
981
982 ** pcase.el provides the ML-style pattern matching macro `pcase'.
983
984 ** secrets.el is an implementation of the Secret Service API, an
985 interface to password managers like GNOME Keyring or KDE Wallet. The
986 Secret Service API requires D-Bus for communication. The command
987 `secrets-show-secrets' offers a buffer with a visualization of the
988 secrets.
989
990 ** notifications.el provides an implementation of the Desktop
991 Notifications API. It requires D-Bus for communication.
992
993 ** soap-client.el supports access to SOAP web services from Emacs.
994 soap-inspect.el is an interactive inspector for SOAP WSDL structures.
995
996 ---
997 ** New generic mode, xmodmap-generic-mode, for xmodmap files.
998
999 ---
1000 ** New emacs-lock.el package.
1001 (The previous version has been moved to obsolete/old-emacs-lock.el.)
1002 Now, there is a proper minor mode `emacs-lock-mode'.
1003 Protection against exiting Emacs and killing the buffer can be set
1004 separately. The mechanism for automatically turning off protection
1005 for buffers with dead inferior processes has been generalized.
1006
1007 \f
1008 * Incompatible Lisp Changes in Emacs 24.1
1009
1010 ---
1011 ** `char-direction-table' and the associated function `char-direction'
1012 were deleted. They were buggy and inferior to the new support of
1013 bidirectional editing introduced in Emacs 24. If you need the
1014 bidirectional properties of a character, use `get-char-code-property'
1015 with the last argument `bidi-class'.
1016
1017 +++
1018 ** `copy-directory' now copies the source directory as a subdirectory
1019 of the target directory, if the latter is an existing directory. The
1020 new optional arg COPY-CONTENTS, if non-nil, makes the function copy
1021 the contents directly into a pre-existing target directory.
1022
1023 +++
1024 ** For mouse click input events in the text area, the Y pixel
1025 coordinate in the POSITION list now counts from the top of the text
1026 area, excluding any header line. Previously, it counted from the top
1027 of the header line.
1028
1029 ---
1030 ** Support for "old-style" backquotes, which have been obsolete for
1031 more than 10 years, has been further reduced. Now a backquote not
1032 followed by a space is always treated as a "new-style" backquote.
1033 Please consider completely removing all "old-style" backquotes from
1034 your code as a matter of some urgency. If your code uses backquotes
1035 as documented in the Elisp manual, and compiles without warning, then
1036 you have nothing to do in this regard. Code not following the
1037 appropriate conventions may fail to compile. The most common cause of
1038 trouble seems to be an old-style backquote followed by a newline.
1039
1040 ---
1041 ** view-buffer now treats special mode-class in the same way that
1042 view-file has since Emacs 22 (ie, it won't enable View mode if the
1043 major-mode is special).
1044
1045 +++
1046 ** Passing a nil argument to a minor mode defined by define-minor-mode
1047 now turns the mode ON unconditionally. This is so that you can write, e.g.
1048 (add-hook 'text-mode-hook 'foo-minor-mode)
1049 to enable foo-minor-mode in Text mode buffers, thus removing the need
1050 for `turn-on-foo-minor-mode' style functions.
1051
1052 +++
1053 ** During startup, Emacs no longer adds entries for `menu-bar-lines'
1054 and `tool-bar-lines' to `default-frame-alist' and `initial-frame-alist'.
1055 With these alist entries omitted, `make-frame' checks the value of the
1056 variable `menu-bar-mode'/`tool-bar-mode' to determine whether to create
1057 a menu-bar or tool-bar, respectively. If the alist entries are added,
1058 they override the value of `menu-bar-mode'/`tool-bar-mode'.
1059
1060 +++
1061 ** Regions created by mouse dragging are now normal active regions,
1062 similar to the ones created by shift-selection. In previous Emacs
1063 versions, these regions were delineated by `mouse-drag-overlay', which
1064 has now been removed.
1065
1066 +++
1067 ** The fourth argument of filter-buffer-substring, which says to remove
1068 text properties from the final result, has been removed.
1069 Eg simply pass the result through substring-no-properties if you need this.
1070
1071 ---
1072 ** cl.el no longer provides `cl-19'.
1073
1074 ** The menu bar bindings's caches are not used any more.
1075 Use (where-is-internal <def> nil t) instead.
1076
1077 +++
1078 ** The following obsolete (mostly since at least 21.1) functions and aliases
1079 have been removed (the appropriate new function is given in parentheses):
1080 comint-kill-output (comint-delete-output),
1081 decompose-composite-char (char-to-string),
1082 outline-visible (outline-invisible-p),
1083 internal-find-face (facep), internal-get-face (facep and check-face),
1084 frame-update-faces (not needed),
1085 frame-update-face-colors (frame-set-background-mode),
1086 x-frob-font-weight and x-frob-font-slant (appropriate make-face-* function),
1087 x-make-font-bold and x-make-font-demibold (make-face-bold),
1088 x-make-font-italic and x-make-font-oblique (make-face-italic),
1089 x-make-font-bold-italic (make-face-bold-italic),
1090 x-make-font-unbold (make-face-unbold),
1091 x-make-font-unitalic (make-face-unitalic),
1092 mldrag-drag-mode-line (mouse-drag-mode-line),
1093 mldrag-drag-vertical-line (mouse-drag-vertical-line),
1094 iswitchb-default-keybindings (iswitchb-mode), char-bytes (== 1),
1095 isearch-return-char (isearch-printing-char), make-local-hook (not needed)
1096
1097 +++
1098 ** The following obsolete (mostly since at least 21.1) variables and varaliases
1099 have been removed (the appropriate new variable is given in parentheses):
1100 checkdoc-minor-keymap (checkdoc-minor-mode-map),
1101 vc-header-alist (vc-BACKEND-header), directory-sep-char (== ?/)
1102 font-lock-defaults-alist (font-lock-defaults), and e (float-e).
1103
1104 ---
1105 ** The following obsolete files were removed:
1106 sc.el, x-menu.el, rnews.el, rnewspost.el
1107
1108 ** FIXME finder-inf.el changes.
1109
1110 \f
1111 * Lisp changes in Emacs 24.1
1112
1113 +++
1114 ** Code can now use lexical scoping by default instead of dynamic scoping.
1115 The `lexical-binding' variable lets code use lexical scoping for local
1116 variables. It is typically set via a file-local variable in the first
1117 line of the file, in which case it applies to all the code in that file.
1118 +++
1119 *** `eval' takes a new optional argument `lexical' to choose the new lexical
1120 binding instead of the old dynamic binding mode.
1121 +++
1122 *** Lexically scoped interpreted functions are represented with a new form
1123 of function value which looks like (closure ENV ARGS &rest BODY).
1124
1125 *** New macro `letrec' to define recursive local functions.
1126 +++
1127 *** New function `special-variable-p' to check whether a variable is
1128 declared as dynamically bound.
1129
1130 +++
1131 ** An Emacs Lisp testing tool is now included.
1132 Emacs Lisp developers can use this tool to write automated tests for
1133 their code. See the ERT info manual for details.
1134
1135 ** Changes for bidirectional display and editing
1136
1137 +++
1138 *** New function `current-bidi-paragraph-direction'.
1139 This returns the actual value of base direction of the paragraph at
1140 point.
1141
1142 +++
1143 *** New function `bidi-string-mark-left-to-right'.
1144 Given a string containing characters from right-to-left (RTL) scripts,
1145 this function returns another string which can be safely inserted into
1146 a buffer, such that any following text will be always displayed to the
1147 right of that string. (This works by appending the Unicode
1148 "LEFT-TO-RIGHT MARK" character when the argument string might need that.)
1149
1150 This is useful when the buffer has overall left-to-right (LTR)
1151 paragraph direction and you need to insert a string whose contents and
1152 directionality are not known in advance, without disrupting the layout
1153 of the line.
1154
1155 ** Window changes
1156 +++
1157 *** Window tree functions are accessible in Elisp.
1158 Functions are provided to return the parent, siblings or child windows
1159 of any window including internal windows (windows not associated with a
1160 buffer) in the window tree.
1161 +++
1162 **** New function `window-valid-p' gives non-nil for live and internal
1163 windows.
1164 +++
1165 **** Window manipulation can deal with internal windows.
1166 Many window handling functions like `split-window', `delete-window', or
1167 `delete-other-windows' as well as the window resizing functions can now
1168 act on any window including internal ones.
1169 +++
1170 *** window-total-height/-width vs window-body-height/-width.
1171 The function `window-height' has been renamed to `window-total-height'
1172 and `window-width' has been renamed to `window-body-width'. The old
1173 names are provided as aliases. Two new functions `window-total-width'
1174 and `window-body-height' are provided.
1175 +++
1176 *** Window parameters specific to window handling functions.
1177 For each window you can specify a parameter to override the default
1178 behavior of a number of functions like `split-window', `delete-window'
1179 and `delete-other-windows'. The variable `ignore-window-parameters'
1180 allows to ignore processing such parameters.
1181 +++
1182 *** New semantics of third argument of `split-window'.
1183 The third argument of `split-window' has been renamed to SIDE and can be
1184 set to any of the values 'below, 'right, 'above, or 'left to make the
1185 new window appear on the corresponding side of the window that shall be
1186 split. Any other value of SIDE will cause `split-window' to split the
1187 window into two side-by-side windows as before.
1188 +++
1189 *** Window resizing functions.
1190 A new standard function for resizing windows called `window-resize' has
1191 been introduced. This and all other functions for resizing windows no
1192 longer delete any windows when they become too small.
1193 +++
1194 *** Deleting the selected window now selects the most recently selected
1195 live window on that frame instead.
1196 +++
1197 *** `adjust-window-trailing-edge' adjustments.
1198 `adjust-window-trailing-edge' can now deal with fixed-size windows and
1199 is able to resize other windows if a window adjacent to the trailing
1200 edge cannot be shrunk any more. This makes its behavior more similar to
1201 that of Emacs 21 without compromising, however, its inability to delete
1202 windows which was introduced in Emacs 22.
1203 +++
1204 *** Window-local buffer lists.
1205 Windows now have local buffer lists. This means that removing a buffer
1206 from display in a window will preferably show the buffer previously
1207 shown in that window with its previous window-start and window-point
1208 positions. This also means that the same buffer may be automatically
1209 shown twice even if it already appears in another window.
1210 +++
1211 *** `switch-to-buffer' has a new optional argument FORCE-SAME-WINDOW,
1212 which if non-nil requires the buffer to be displayed in the currently
1213 selected window, signaling an error otherwise. If nil, another window
1214 can be used, e.g. if the selected one is strongly dedicated.
1215 +++
1216 *** `split-window-vertically' and `split-window-horizontally' renamed
1217 to `split-window-below' and `split-window-right' respectively.
1218 The old names are kept as aliases.
1219 +++
1220 *** Display actions
1221
1222 **** The second arg to `display-buffer' and `pop-to-buffer' is now
1223 named ACTION, and takes a display action of the same form as
1224 `display-buffer-base-action' (see Changes, above). A non-nil,
1225 non-list value is treated specially, as the old meaning.
1226
1227 **** New variable `display-buffer-overriding-action'.
1228
1229 **** The procedure of `display-buffer' etc. to choose a window is
1230 determined by combining `display-buffer-overriding-action',
1231 `display-buffer-alist', the ACTION arg, `display-buffer-base-action',
1232 and `display-buffer-fallback-action'. The second and fourth of these
1233 are user-customizable variables.
1234
1235 See the docstring of `display-buffer' for details.
1236
1237 +++
1238 *** New behavior of `quit-window'.
1239 The behavior of `quit-window' has been changed in order to restore the
1240 state before the last buffer display operation in that window.
1241
1242 +++
1243 *** The new option `frame-auto-hide-function' lets you choose between
1244 iconifying or deleting a frame when burying a buffer shown in a dedicated
1245 frame or quitting a window showing a buffer in a frame of its own.
1246
1247 +++
1248 *** New functions `window-state-get' and `window-state-put'.
1249 These functions allow to save and restore the state of an arbitrary
1250 frame or window as an Elisp object.
1251
1252 ** Completion
1253
1254 *** New variable completion-extra-properties used to specify extra properties
1255 of the current completion:
1256 - :annotate-function, same as the old completion-annotate-function.
1257 - :exit-function, function to call after completion took place.
1258
1259 *** Functions on completion-at-point-functions can return any of the properties
1260 valid for completion-extra-properties.
1261
1262 *** completion-annotate-function is obsolete.
1263
1264 *** New `metadata' method for completion tables. The metadata thus returned
1265 can specify various details of the data returned by `all-completions':
1266 - `category' is the kind of objects returned (e.g., `buffer', `file', ...),
1267 used to select a style in completion-category-overrides.
1268 - `annotation-function' to add annotations in *Completions*.
1269 - `display-sort-function' to specify how to sort entries in *Completions*.
1270 - `cycle-sort-function' to specify how to sort entries when cycling.
1271
1272 *** minibuffer-local-filename-must-match-map is not used any more.
1273 Instead, the bindings in minibuffer-local-filename-completion-map are
1274 combined with minibuffer-local-must-match-map.
1275
1276 *** New variable `completing-read-function' allows overriding the
1277 behavior of `completing-read'.
1278
1279 +++
1280 ** `glyphless-char-display' can now distinguish between graphical and
1281 text terminal display, via a char-table entry that is a cons cell.
1282
1283 ** `open-network-stream' can now be used to open an encrypted stream.
1284 It now accepts an optional `:type' parameter for initiating a TLS
1285 connection, directly or via STARTTLS. To do STARTTLS, additional
1286 parameters (`:end-of-command', `:success', `:capabilities-command')
1287 must also be supplied.
1288
1289 +++
1290 ** pre/post-command-hook are not reset to nil upon error.
1291 Instead, the offending function is removed.
1292
1293 ** New hook types
1294
1295 +++
1296 *** New function `run-hook-wrapped' for running an abnormal hook by
1297 passing the hook functions as arguments to a "wrapping" function.
1298 Like `run-hook-with-args-until-success', it stops at the first
1299 non-nil return value.
1300
1301 +++
1302 *** New macro `with-wrapper-hook' for running an abnormal hook as a
1303 set of "wrapping" filters, similar to around advice.
1304 (A version of this macro was actually added in Emacs 23.2 but was not
1305 advertised at the time.)
1306
1307 +++
1308 ** New macro `condition-case-unless-debug' (this was actually added in
1309 Emacs 23.1 as condition-case-no-debug, but not advertised)
1310
1311 +++
1312 ** The macro `with-demoted-errors' was added in Emacs 23.1, but not advertised.
1313
1314 +++
1315 ** The new function `server-eval-at' allows evaluation of Lisp forms on
1316 named Emacs server instances, using TCP sockets.
1317
1318 +++
1319 ** `call-process' and `call-process-region' allow a `(:file "file")' spec
1320 to redirect STDOUT to a file.
1321
1322 ---
1323 ** Variable `stack-trace-on-error' removed.
1324 Also the debugger can now "continue" from an error, which means it will jump
1325 to the error handler as if the debugger had not been invoked instead of
1326 jumping all the way to the top-level.
1327
1328 +++
1329 ** The function format-time-string now supports the %N directive, for
1330 higher-resolution time stamps.
1331
1332 +++
1333 ** New function `read-char-choice' reads a restricted set of characters,
1334 discarding any inputs not inside the set.
1335
1336 +++
1337 ** `image-library-alist' is renamed to `dynamic-library-alist'.
1338 The variable is now used to load all kind of supported dynamic libraries,
1339 not just image libraries. The previous name is still available as an
1340 obsolete alias.
1341
1342 ** New variable `syntax-propertize-function'.
1343 This replaces `font-lock-syntactic-keywords' which is now obsolete.
1344 This allows syntax-table properties to be set independently from font-lock:
1345 just call syntax-propertize to make sure the text is propertized.
1346 Together with this new variable come a new hook
1347 syntax-propertize-extend-region-functions, as well as two helper functions:
1348 syntax-propertize-via-font-lock to reuse old font-lock-syntactic-keywords
1349 as-is; and syntax-propertize-rules which provides a new way to specify
1350 syntactic rules.
1351
1352 +++
1353 ** New hook post-self-insert-hook run at the end of self-insert-command.
1354
1355 +++
1356 ** Syntax tables support a new "comment style c" additionally to style b.
1357
1358 ---
1359 ** frame-local variables cannot be let-bound any more.
1360
1361 ** Major and minor mode changes
1362 +++
1363 *** `prog-mode' is a new major mode from which programming modes
1364 should be derived.
1365
1366 +++
1367 **** `prog-mode-hook' can be used to enable features for programming
1368 modes, e.g. (add-hook 'prog-mode-hook 'flyspell-prog-mode) to enable
1369 on-the-fly spell checking for comments and strings.
1370
1371 +++
1372 *** New hook `change-major-mode-after-body-hook', run by
1373 `run-mode-hooks' just before any other mode hooks.
1374
1375 +++
1376 *** Enabled globalized minor modes can be disabled in specific major modes.
1377 If the global mode is global-FOO-mode, then run (FOO-mode -1) in the
1378 major mode's hook, where FOO-mode toggles the mode on a per-buffer basis.
1379
1380 +++
1381 *** `define-minor-mode' accepts a new keyword :variable.
1382
1383 +++
1384 ** `delete-file' and `delete-directory' now accept optional arg TRASH.
1385 Trashing is performed if TRASH and `delete-by-moving-to-trash' are
1386 both non-nil. Interactively, TRASH defaults to t, unless a prefix
1387 argument is supplied (see Trash changes, above).
1388
1389 ---
1390 ** `facemenu-read-color' is now an alias for `read-color'.
1391
1392 +++
1393 ** The command `read-color' now requires a match for a color name
1394 or RGB triplet, instead of signaling an error if the user provides
1395 invalid input.
1396
1397 +++
1398 ** Tool-bars can display separators.
1399 Tool-bar separators are handled like menu separators in menu-bar maps,
1400 i.e. via menu entries of the form `(menu-item "--")'.
1401
1402 ** Image API
1403
1404 +++
1405 *** Animated images support (currently animated gifs only).
1406
1407 +++
1408 **** `image-animated-p' returns non-nil if an image can be animated.
1409
1410 +++
1411 **** `image-animate' animates a supplied image spec.
1412
1413 +++
1414 **** `image-animate-timer' returns the timer object for an image that
1415 is being animated.
1416
1417 ---
1418 *** `image-extension-data' has been renamed to `image-metadata'.
1419 The old name is an obsolete alias to the new one.
1420
1421 +++
1422 *** Image mode can view any image type that ImageMagick supports.
1423 This requires Emacs to be built with ImageMagick support.
1424 Then the function `imagemagick-types' returns a list of image file
1425 extensions that your installation of ImageMagick supports. The
1426 function `imagemagick-register-types' enables ImageMagick support for
1427 these image types, minus those listed in `imagemagick-types-inhibit'.
1428 Visiting one of these file types will then use Image mode.
1429
1430 ---
1431 *** New commands to resize and rotate images in Image mode.
1432 These require Emacs to be built with ImageMagick support.
1433 image-transform-fit-to-height, image-transform-fit-to-width,
1434 image-transform-set-rotation, image-transform-set-scale.
1435
1436 ** XML and HTML parsing
1437 If Emacs is compiled with libxml2 support, there are two new functions:
1438 `libxml-parse-html-region' (which parses "real world" HTML) and
1439 `libxml-parse-xml-region' (which parses XML). Both return an Emacs
1440 Lisp parse tree.
1441
1442 FIXME: These should be front-ended by xml.el.
1443
1444 ** GnuTLS
1445
1446 *** New library `gnutls.el'.
1447 This requires Emacs to have been built with GnuTLS support.
1448 The main functions are `open-gnutls-stream' and `gnutls-negotiate'.
1449 It's easiest to use these functions through `open-network-stream'
1450 because it can upgrade connections through STARTTLS opportunistically
1451 or use plain SSL, depending on your needs. For debugging, set
1452 `gnutls-log-level' greater than 0.
1453
1454 ** Isearch
1455
1456 ---
1457 *** New hook `isearch-update-post-hook' that runs in `isearch-update'.
1458
1459 +++
1460 ** Progress reporters can now "spin".
1461 The MIN-VALUE and MAX-VALUE arguments of `make-progress-reporter' can
1462 now be nil, or omitted. This makes a "non-numeric" reporter. Each
1463 time you call `progress-reporter-update' on that progress reporter,
1464 with a nil or omitted VALUE argument, the reporter message is
1465 displayed with a "spinning bar".
1466
1467 +++
1468 ** New variable `revert-buffer-in-progress-p' is true while a buffer is
1469 being reverted, even if the buffer has a local `revert-buffer-function'.
1470
1471 ---
1472 ** New variables `delayed-warnings-list' and `delayed-warnings-hook'.
1473 If delayed-warnings-list is non-nil, the command loop calls
1474 delayed-warnings-hook after post-command-hook. At present, this is
1475 only used by Emacs on some platforms to display warnings during
1476 startup, which might otherwise not be noticed. This uses the functions
1477 display-delayed-warnings and collapse-delayed-warnings.
1478
1479
1480 +++
1481 ** `set-auto-mode' now respects mode: local variables at the end of files,
1482 as well as those in the -*- line.
1483
1484 ---
1485 ** rx.el has a new `group-n' construct for explicitly numbered groups.
1486
1487 +++
1488 ** New function `make-composed-keymap' that constructs a new keymap
1489 from multiple input maps. You can use this to make a keymap that
1490 inherits from multiple maps, eg:
1491 (set-keymap-parent newmap (make-composed-keymap othermap parent))
1492
1493 +++
1494 ** Set `debug-on-event' to make Emacs enter the debugger e.g. on receipt
1495 of SIGUSR1. This can be useful when `inhibit-quit' is set.
1496
1497 +++
1498 ** New reader macro ## that stands for the empty symbol.
1499 This means that the empty symbol can now be read back. Also, #: by itself
1500 (when not immediately followed by a possible symbol character) stands for
1501 an empty uninterned symbol.
1502
1503 +++
1504 ** New math functions `isnan', `copysign', `frexp', `ldexp'.
1505
1506 ** Obsolete functions and variables
1507
1508 ---
1509 *** `tooltip-use-echo-area' is obsolete.
1510 Rather than setting this to t, disable Tooltip mode instead.
1511
1512 +++
1513 *** buffer-substring-filters is obsolete.
1514 Use `filter-buffer-substring-functions' instead.
1515
1516 ---
1517 *** `byte-compile-disable-print-circle' is obsolete.
1518
1519 ---
1520 *** `deferred-action-list' and `deferred-action-function' are obsolete.
1521 Use `post-command-hook' instead.
1522
1523 +++
1524 *** `font-lock-maximum-size' is obsolete.
1525
1526 \f
1527 * Changes in Emacs 24.1 on non-free operating systems
1528
1529 ---
1530 ** On MS Windows, Emacs warns when using the obsolete init file _emacs,
1531 and also when HOME is set to C:\ by default.
1532
1533 ** New configure.bat options
1534
1535 +++
1536 *** --enable-checking builds Emacs with extra runtime checks.
1537
1538 +++
1539 *** --distfiles specifies files to be included in binary distribution.
1540
1541 +++
1542 *** --without-gnutls disables automatic GnuTLS detection.
1543
1544 +++
1545 *** --lib for general library linkage, works with the USER_LIBS build variable.
1546
1547 +++
1548 ** New make target `dist' to create binary distribution for MS Windows.
1549
1550 ---
1551 ** The Lisp function `w32-default-color-map' is now obsolete.
1552 (It is only used internally in the Emacs C code.)
1553
1554 +++
1555 ** Customize ns-auto-hide-menu-bar to have the menu-bar hidden, but
1556 reappear on mouse-over. (Requires OS X 10.6 or later.)
1557
1558 \f
1559 ----------------------------------------------------------------------
1560 This file is part of GNU Emacs.
1561
1562 GNU Emacs is free software: you can redistribute it and/or modify
1563 it under the terms of the GNU General Public License as published by
1564 the Free Software Foundation, either version 3 of the License, or
1565 (at your option) any later version.
1566
1567 GNU Emacs is distributed in the hope that it will be useful,
1568 but WITHOUT ANY WARRANTY; without even the implied warranty of
1569 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1570 GNU General Public License for more details.
1571
1572 You should have received a copy of the GNU General Public License
1573 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1574
1575 \f
1576 Local variables:
1577 mode: outline
1578 paragraph-separate: "[ \f]*$"
1579 end: