info.el 163 KB
Newer Older
1
;;; info.el --- info package for Emacs
Eric S. Raymond's avatar
Eric S. Raymond committed
2

3
;; Copyright (C) 1985, 1986, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4
;;   2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
5

Eric S. Raymond's avatar
Eric S. Raymond committed
6
;; Maintainer: FSF
Eric S. Raymond's avatar
Eric S. Raymond committed
7
;; Keywords: help
Eric S. Raymond's avatar
Eric S. Raymond committed
8

Jim Blandy's avatar
Jim Blandy committed
9 10 11 12
;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
Eric S. Raymond's avatar
Eric S. Raymond committed
13
;; the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
14 15 16 17 18 19 20 21
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
Erik Naggum's avatar
Erik Naggum committed
22
;; along with GNU Emacs; see the file COPYING.  If not, write to the
Lute Kamstra's avatar
Lute Kamstra committed
23 24
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
Jim Blandy's avatar
Jim Blandy committed
25

Eric S. Raymond's avatar
Eric S. Raymond committed
26 27
;;; Commentary:

28
;; Note that nowadays we expect Info files to be made using makeinfo.
29 30 31 32
;; In particular we make these assumptions:
;;  - a menu item MAY contain colons but not colon-space ": "
;;  - a menu item ending with ": " (but not ":: ") is an index entry
;;  - a node name MAY NOT contain a colon
33 34
;; This distinction is to support indexing of computer programming
;; language terms that may contain ":" but not ": ".
Eric S. Raymond's avatar
Eric S. Raymond committed
35 36 37

;;; Code:

Dave Love's avatar
Dave Love committed
38 39
(eval-when-compile (require 'jka-compr))

40
(defgroup info nil
41
  "Info subsystem."
42 43 44 45
  :group 'help
  :group 'docs)


Jim Blandy's avatar
Jim Blandy committed
46
(defvar Info-history nil
47
  "Stack of Info nodes user has visited.
48
Each element of the stack is a list (FILENAME NODENAME BUFFERPOS).")
Jim Blandy's avatar
Jim Blandy committed
49

50
(defvar Info-history-forward nil
51
  "Stack of Info nodes user has visited with `Info-history-back' command.
52
Each element of the stack is a list (FILENAME NODENAME BUFFERPOS).")
53

Juri Linkov's avatar
Juri Linkov committed
54
(defvar Info-history-list nil
55
  "List of all Info nodes user has visited.
56
Each element of the list is a list (FILENAME NODENAME).")
Juri Linkov's avatar
Juri Linkov committed
57

58
(defcustom Info-enable-edit nil
59
  "*Non-nil means the \\<Info-mode-map>\\[Info-edit] command in Info can edit the current node.
60
This is convenient if you want to write Info files by hand.
61 62
However, we recommend that you not do this.
It is better to write a Texinfo file and generate the Info file from that,
63 64 65
because that gives you a printed manual as well."
  :type 'boolean
  :group 'info)
Jim Blandy's avatar
Jim Blandy committed
66

67
(defvar Info-enable-active-nodes nil
Jim Blandy's avatar
Jim Blandy committed
68 69
  "Non-nil allows Info to execute Lisp code associated with nodes.
The Lisp code is executed when the node is selected.")
70
(put 'Info-enable-active-nodes 'risky-local-variable t)
Jim Blandy's avatar
Jim Blandy committed
71

72
(defface info-node
73 74 75
  '((((class color) (background light)) :foreground "brown" :weight bold :slant italic)
    (((class color) (background dark)) :foreground "white" :weight bold :slant italic)
    (t :weight bold :slant italic))
76 77 78
  "Face for Info node names."
  :group 'info)

79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
(defface info-title-1
  '((((type tty pc) (class color) (background light))
     :foreground "green" :weight bold)
    (((type tty pc) (class color) (background dark))
     :foreground "yellow" :weight bold)
    (t :height 1.2 :inherit info-title-2))
  "Face for info titles at level 1."
  :group 'info)
;; backward-compatibility alias
(put 'Info-title-1-face 'face-alias 'info-title-1)

(defface info-title-2
  '((((type tty pc) (class color)) :foreground "lightblue" :weight bold)
    (t :height 1.2 :inherit info-title-3))
  "Face for info titles at level 2."
  :group 'info)
;; backward-compatibility alias
(put 'Info-title-2-face 'face-alias 'info-title-2)

(defface info-title-3
  '((((type tty pc) (class color)) :weight bold)
    (t :height 1.2 :inherit info-title-4))
  "Face for info titles at level 3."
  :group 'info)
;; backward-compatibility alias
(put 'Info-title-3-face 'face-alias 'info-title-3)

(defface info-title-4
  '((((type tty pc) (class color)) :weight bold)
    (t :weight bold :inherit variable-pitch))
  "Face for info titles at level 4."
  :group 'info)
;; backward-compatibility alias
(put 'Info-title-4-face 'face-alias 'info-title-4)

(defface info-menu-header
  '((((type tty pc))
     :underline t
     :weight bold)
    (t
     :inherit variable-pitch
     :weight bold))
  "Face for headers in Info menus."
  :group 'info)

(defface info-menu-star
125 126
  '((((class color)) :foreground "red1")
    (t :underline t))
127
  "Face for every third `*' in an Info menu."
128
  :group 'info)
129
(put 'info-menu-5 'face-alias 'info-menu-star)
130 131

(defface info-xref
132
  '((((min-colors 88)
133 134
      (class color) (background light)) :foreground "blue1" :underline t)
    (((class color) (background light)) :foreground "blue" :underline t)
135
    (((min-colors 88)
136
      (class color) (background dark)) :foreground "cyan1" :underline t)
137
    (((class color) (background dark)) :foreground "cyan" :underline t)
138
    (t :underline t))
139 140 141
  "Face for Info cross-references."
  :group 'info)

Juri Linkov's avatar
Juri Linkov committed
142
(defface info-xref-visited
143
  '((default :inherit info-xref)
144
    (((class color) (background light)) :foreground "magenta4")
145
    (((class color) (background dark)) :foreground "violet"))
Juri Linkov's avatar
Juri Linkov committed
146 147 148 149
  "Face for visited Info cross-references."
  :group 'info)

(defcustom Info-fontify-visited-nodes t
150
  "*Non-nil to fontify references to visited nodes in `info-xref-visited' face."
151
  :version "22.1"
Juri Linkov's avatar
Juri Linkov committed
152 153 154
  :type 'boolean
  :group 'info)

155
(defcustom Info-fontify-maximum-menu-size 100000
156
  "*Maximum size of menu to fontify if `font-lock-mode' is non-nil."
157 158
  :type 'integer
  :group 'info)
159

Miles Bader's avatar
Miles Bader committed
160
(defcustom Info-use-header-line t
161
  "*Non-nil means to put the beginning-of-node links in an Emacs header-line.
Miles Bader's avatar
Miles Bader committed
162 163 164 165 166
A header-line does not scroll with the rest of the buffer."
  :type 'boolean
  :group 'info)

(defface info-header-xref
167
  '((t :inherit info-xref))
Miles Bader's avatar
Miles Bader committed
168 169 170 171
  "Face for Info cross-references in a node header."
  :group 'info)

(defface info-header-node
172
  '((t :inherit info-node))
Miles Bader's avatar
Miles Bader committed
173 174 175
  "Face for Info nodes in a node header."
  :group 'info)

176
(defvar Info-directory-list nil
Jim Blandy's avatar
Jim Blandy committed
177
  "List of directories to search for Info documentation files.
178
If nil, meaning not yet initialized, Info uses the environment
179
variable INFOPATH to initialize it, or `Info-default-directory-list'
180 181
if there is no INFOPATH variable in the environment, or the
concatenation of the two if INFOPATH ends with a colon.
182 183

When `Info-directory-list' is initialized from the value of
184 185 186 187 188 189 190
`Info-default-directory-list', and Emacs is installed in one of the
standard directories, the directory of Info files that come with Emacs
is put last (so that local Info files override standard ones).

When `Info-directory-list' is initialized from the value of
`Info-default-directory-list', and Emacs is not installed in one
of the standard directories, the first element of the resulting
191 192
list is the directory where Emacs installs the Info files that
come with it.  This is so that Emacs's own manual, which suits the
193 194 195 196 197 198
version of Emacs you are using, will always be found first.  This
is useful when you install an experimental version of Emacs without
removing the standard installation.

If you want to override the order of directories in
`Info-default-directory-list', set INFOPATH in the environment.
199 200

If you run the Emacs executable from the `src' directory in the Emacs
201 202 203 204
source tree, and INFOPATH is not defined, the `info' directory in the
source tree is used as the first element of `Info-directory-list', in
place of the installation Info directory.  This is useful when you run
a version of Emacs without installing it.")
Jim Blandy's avatar
Jim Blandy committed
205

206
(defcustom Info-additional-directory-list nil
207
  "List of additional directories to search for Info documentation files.
208
These directories are searched after those in `Info-directory-list'."
209 210
  :type '(repeat directory)
  :group 'info)
211

212
(defcustom Info-scroll-prefer-subnodes nil
213
  "*If non-nil, \\<Info-mode-map>\\[Info-scroll-up] in a menu visits subnodes.
214

215 216 217 218 219 220 221 222
If this is non-nil, and you scroll far enough in a node that its menu
appears on the screen, the next \\<Info-mode-map>\\[Info-scroll-up]
moves to a subnode indicated by the following menu item.  This means
that you visit a subnode before getting to the end of the menu.

Setting this option to nil results in behavior similar to the stand-alone
Info reader program, which visits the first subnode from the menu only
when you hit the end of the current node."
223
  :version "22.1"
224 225 226
  :type 'boolean
  :group 'info)

227
(defcustom Info-hide-note-references t
228
  "*If non-nil, hide the tag and section reference in *note and * menu items.
Juri Linkov's avatar
Juri Linkov committed
229
If value is non-nil but not `hide', also replaces the \"*note\" with \"see\".
230 231
If value is non-nil but not t or `hide', the reference section is still shown.
`nil' completely disables this feature."
232
  :version "22.1"
Juri Linkov's avatar
Juri Linkov committed
233
  :type '(choice (const :tag "No hiding" nil)
234
		 (const :tag "Replace tag and hide reference" t)
Juri Linkov's avatar
Juri Linkov committed
235 236
		 (const :tag "Hide tag and reference" hide)
		 (other :tag "Only replace tag" tag))
237 238
  :group 'info)

Kim F. Storm's avatar
Kim F. Storm committed
239 240
(defcustom Info-refill-paragraphs nil
  "*If non-nil, attempt to refill paragraphs with hidden references.
241
This refilling may accidentally remove explicit line breaks in the Info
Kim F. Storm's avatar
Kim F. Storm committed
242
file, so be prepared for a few surprises if you enable this feature."
243
  :version "22.1"
Kim F. Storm's avatar
Kim F. Storm committed
244 245 246
  :type 'boolean
  :group 'info)

247
(defcustom Info-search-whitespace-regexp "\\s-+"
Juri Linkov's avatar
Juri Linkov committed
248 249 250 251 252 253 254 255
  "*If non-nil, regular expression to match a sequence of whitespace chars.
This applies to Info search for regular expressions.
You might want to use something like \"[ \\t\\r\\n]+\" instead.
In the Customization buffer, that is `[' followed by a space,
a tab, a carriage return (control-M), a newline, and `]+'."
  :type 'regexp
  :group 'info)

256
(defcustom Info-isearch-search t
257 258 259 260 261 262 263 264 265 266 267
  "*If non-nil, isearch in Info searches through multiple nodes.
Before leaving the initial Info node, where isearch was started,
it fails once with the error message [initial node], and with
subsequent C-s/C-r continues through other nodes without failing
with this error message in other nodes.  When isearch fails for
the rest of the manual, it wraps aroung the whole manual and
restarts the search from the top/final node depending on
search direction.

Setting this option to nil restores the default isearch behavior
with wrapping around the current Info node."
268 269 270 271
  :version "22.1"
  :type 'boolean
  :group 'info)

272 273
(defvar Info-isearch-initial-node nil)

274 275 276 277
(defcustom Info-mode-hook
  ;; Try to obey obsolete Info-fontify settings.
  (unless (and (boundp 'Info-fontify) (null Info-fontify))
    '(turn-on-font-lock))
Juri Linkov's avatar
Juri Linkov committed
278 279 280 281 282 283
  "Hooks run when `Info-mode' is called."
  :type 'hook
  :group 'info)

(defcustom Info-selection-hook nil
  "Hooks run when `Info-select-node' is called."
Colin Walters's avatar
Colin Walters committed
284 285 286
  :type 'hook
  :group 'info)

Juri Linkov's avatar
Juri Linkov committed
287 288 289
(defvar Info-edit-mode-hook nil
  "Hooks run when `Info-edit-mode' is called.")

Jim Blandy's avatar
Jim Blandy committed
290
(defvar Info-current-file nil
291 292
  "Info file that Info is now looking at, or nil.
This is the name that was specified in Info, not the actual file name.
293 294
It doesn't contain directory names or file name extensions added by Info.
Can also be t when using `Info-on-current-buffer'.")
Jim Blandy's avatar
Jim Blandy committed
295 296

(defvar Info-current-subfile nil
Dave Love's avatar
Dave Love committed
297
  "Info subfile that is actually in the *info* buffer now.
298
nil if current Info file is not split into subfiles.")
Jim Blandy's avatar
Jim Blandy committed
299 300 301 302

(defvar Info-current-node nil
  "Name of node that Info is now looking at, or nil.")

303
(defvar Info-tag-table-marker nil
Jim Blandy's avatar
Jim Blandy committed
304 305 306
  "Marker pointing at beginning of current Info file's tag table.
Marker points nowhere if file has no tag table.")

307 308 309
(defvar Info-tag-table-buffer nil
  "Buffer used for indirect tag tables.")

310 311 312
(defvar Info-current-file-completions nil
  "Cached completion list for current Info file.")

313 314 315
(defvar Info-file-supports-index-cookies nil
  "Non-nil if current Info file supports index cookies.")

316
(defvar Info-index-alternatives nil
Dave Love's avatar
Dave Love committed
317
  "List of possible matches for last `Info-index' command.")
318

319 320 321 322 323
(defvar Info-point-loc nil
  "Point location within a selected node.
If string, the point is moved to the proper occurrence of the
name of the followed cross reference within a selected node.
If number, the point is moved to the corresponding line.")
Juri Linkov's avatar
Juri Linkov committed
324

325 326
(defvar Info-standalone nil
  "Non-nil if Emacs was started solely as an Info browser.")
327

328
(defvar Info-suffix-list
329 330
  ;; The MS-DOS list should work both when long file names are
  ;; supported (Windows 9X), and when only 8+3 file names are available.
331 332 333
  (if (eq system-type 'ms-dos)
      '( (".gz"      . "gunzip")
	 (".z"       . "gunzip")
334
	 (".bz2"     . ("bzip2" "-dc"))
335 336 337 338 339 340 341 342
	 (".inz"     . "gunzip")
	 (".igz"     . "gunzip")
	 (".info.Z"  . "gunzip")
	 (".info.gz" . "gunzip")
	 ("-info.Z"  . "gunzip")
	 ("-info.gz" . "gunzip")
	 ("/index.gz". "gunzip")
	 ("/index.z" . "gunzip")
343
	 (".inf"     . nil)
344 345 346
	 (".info"    . nil)
	 ("-info"    . nil)
	 ("/index"   . nil)
347
	 (""         . nil))
348 349 350 351
    '( (".info.Z".    "uncompress")
       (".info.Y".    "unyabba")
       (".info.gz".   "gunzip")
       (".info.z".    "gunzip")
352
       (".info.bz2" . ("bzip2" "-dc"))
353 354 355 356
       (".info".      nil)
       ("-info.Z".   "uncompress")
       ("-info.Y".   "unyabba")
       ("-info.gz".  "gunzip")
357
       ("-info.bz2" . ("bzip2" "-dc"))
358 359 360 361 362 363
       ("-info.z".   "gunzip")
       ("-info".     nil)
       ("/index.Z".   "uncompress")
       ("/index.Y".   "unyabba")
       ("/index.gz".  "gunzip")
       ("/index.z".   "gunzip")
364
       ("/index.bz2". ("bzip2" "-dc"))
365 366 367 368 369
       ("/index".     nil)
       (".Z".         "uncompress")
       (".Y".         "unyabba")
       (".gz".        "gunzip")
       (".z".         "gunzip")
370
       (".bz2" .      ("bzip2" "-dc"))
371
       ("".           nil)))
372 373
  "List of file name suffixes and associated decoding commands.
Each entry should be (SUFFIX . STRING); the file is given to
374 375 376 377 378 379
the command as standard input.

STRING may be a list of strings.  In that case, the first element is
the command name, and the rest are arguments to that command.

If STRING is nil, no decoding is done.
380 381
Because the SUFFIXes are tried in order, the empty string should
be last in the list.")
382

383
;; Concatenate SUFFIX onto FILENAME.  SUFFIX should start with a dot.
384 385 386 387
;; First, on MS-DOS with no long file names support, delete some of
;; the extension in FILENAME to make room.
(defun info-insert-file-contents-1 (filename suffix lfn)
  (if lfn	; long file names are supported
388 389
      (concat filename suffix)
    (let* ((sans-exts (file-name-sans-extension filename))
390 391 392
	   ;; How long is the extension in FILENAME (not counting the dot).
	   (ext-len (max 0 (- (length filename) (length sans-exts) 1)))
	   ext-left)
393
      ;; SUFFIX starts with a dot.  If FILENAME already has one,
394
      ;; get rid of the one in SUFFIX (unless suffix is empty).
395
      (or (and (<= ext-len 0)
396
	       (not (eq (aref filename (1- (length filename))) ?.)))
397
	  (= (length suffix) 0)
398
	  (setq suffix (substring suffix 1)))
399 400
      ;; How many chars of that extension should we keep?
      (setq ext-left (min ext-len (max 0 (- 3 (length suffix)))))
401 402 403 404 405
      ;; Get rid of the rest of the extension, and add SUFFIX.
      (concat (substring filename 0 (- (length filename)
				       (- ext-len ext-left)))
	      suffix))))

406 407 408 409
(defun info-file-exists-p (filename)
  (and (file-exists-p filename)
       (not (file-directory-p filename))))

410
(defun info-insert-file-contents (filename &optional visit)
411
  "Insert the contents of an Info file in the current buffer.
412
Do the right thing if the file has been compressed or zipped."
413
  (let* ((tail Info-suffix-list)
414 415 416
	 (lfn (if (fboundp 'msdos-long-file-names)
		  (msdos-long-file-names)
		t))
417 418 419
	 (check-short (and (fboundp 'msdos-long-file-names)
			   lfn))
	 fullname decoder done)
420
    (if (info-file-exists-p filename)
421 422
	;; FILENAME exists--see if that name contains a suffix.
	;; If so, set DECODE accordingly.
423 424 425 426 427 428 429 430
	(progn
	  (while (and tail
		      (not (string-match
			    (concat (regexp-quote (car (car tail))) "$")
			    filename)))
	    (setq tail (cdr tail)))
	  (setq fullname filename
		decoder (cdr (car tail))))
431
      ;; Try adding suffixes to FILENAME and see if we can find something.
432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
      (while (and tail (not done))
	(setq fullname (info-insert-file-contents-1 filename
						    (car (car tail)) lfn))
	(if (info-file-exists-p fullname)
	    (setq done t
		  ;; If we found a file with a suffix, set DECODER
		  ;; according to the suffix.
		  decoder (cdr (car tail)))
	  ;; When the MS-DOS port runs on Windows, we need to check
	  ;; the short variant of a long file name as well.
	  (when check-short
	    (setq fullname (info-insert-file-contents-1 filename
							(car (car tail)) nil))
	    (if (info-file-exists-p fullname)
		(setq done t
		      decoder (cdr (car tail))))))
448 449
	(setq tail (cdr tail)))
      (or tail
450
	  (error "Can't find %s or any compressed version of it" filename)))
451 452 453 454 455
    ;; check for conflict with jka-compr
    (if (and (featurep 'jka-compr)
	     (jka-compr-installed-p)
	     (jka-compr-get-compression-info fullname))
	(setq decoder nil))
456
    (if decoder
457 458 459 460 461 462
	(progn
	  (insert-file-contents-literally fullname visit)
	  (let ((buffer-read-only nil)
		(coding-system-for-write 'no-conversion)
		(default-directory (or (file-name-directory fullname)
				       default-directory)))
463 464 465 466
	    (or (consp decoder)
		(setq decoder (list decoder)))
	    (apply 'call-process-region (point-min) (point-max)
		   (car decoder) t t nil (cdr decoder))))
467
      (insert-file-contents fullname visit))))
468

469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506
(defun Info-default-dirs ()
  (let ((source (expand-file-name "info/" source-directory))
	(sibling (if installation-directory
		     (expand-file-name "info/" installation-directory)
		   (if invocation-directory
		       (let ((infodir (expand-file-name
				       "../info/"
				       invocation-directory)))
			 (if (file-exists-p infodir)
			     infodir
			   (setq infodir (expand-file-name
					  "../../../info/"
					  invocation-directory))
			   (and (file-exists-p infodir)
				infodir))))))
	alternative)
    (setq alternative
	  (if (and sibling (file-exists-p sibling))
	      ;; Uninstalled, Emacs builddir != srcdir.
	      sibling
	    ;; Uninstalled, builddir == srcdir
	    source))
    (if (or (member alternative Info-default-directory-list)
	    ;; On DOS/NT, we use movable executables always,
	    ;; and we must always find the Info dir at run time.
	    (if (memq system-type '(ms-dos windows-nt))
		nil
	      ;; Use invocation-directory for Info
	      ;; only if we used it for exec-directory also.
	      (not (string= exec-directory
			    (expand-file-name "lib-src/"
					      installation-directory))))
	    (not (file-exists-p alternative)))
	Info-default-directory-list
      ;; `alternative' contains the Info files that came with this
      ;; version, so we should look there first.  `Info-insert-dir'
      ;; currently expects to find `alternative' first on the list.
      (cons alternative
507 508 509
	    ;; Don't drop the last part, it might contain non-Emacs stuff.
	    ;; (reverse (cdr (reverse
	    Info-default-directory-list)))) ;; )))
510

511
(defun info-initialize ()
Dave Love's avatar
Dave Love committed
512
  "Initialize `Info-directory-list', if that hasn't been done yet."
513
  (unless Info-directory-list
514
    (let ((path (getenv "INFOPATH")))
515
      (setq Info-directory-list
516 517
	    (prune-directory-list
	     (if path
518 519 520 521 522 523
		 (if (string-match ":\\'" path)
		     (append (split-string (substring path 0 -1)
					   (regexp-quote path-separator))
			     (Info-default-dirs))
		   (split-string path (regexp-quote path-separator)))
	       (Info-default-dirs)))))))
524

525 526 527 528 529
;;;###autoload
(defun info-other-window (&optional file)
  "Like `info' but show the Info buffer in another window."
  (interactive (if current-prefix-arg
		   (list (read-file-name "Info file name: " nil nil t))))
530
  (let (same-window-buffer-names same-window-regexps)
531
    (info file)))
532

533
;;;###autoload (add-hook 'same-window-regexps "\\*info\\*\\(\\|<[0-9]+>\\)")
534

535
;;;###autoload (put 'info 'info-file "emacs")
Jim Blandy's avatar
Jim Blandy committed
536
;;;###autoload
537
(defun info (&optional file buffer)
Jim Blandy's avatar
Jim Blandy committed
538 539 540
  "Enter Info, the documentation browser.
Optional argument FILE specifies the file to examine;
the default is the top-level directory of Info.
Dave Love's avatar
Dave Love committed
541 542
Called from a program, FILE may specify an Info node of the form
`(FILENAME)NODENAME'.
543 544 545 546
Optional argument BUFFER specifies the Info buffer name;
the default buffer name is *info*.  If BUFFER exists,
just switch to BUFFER.  Otherwise, create a new buffer
with the top-level Info directory.
Jim Blandy's avatar
Jim Blandy committed
547

548 549
In interactive use, a non-numeric prefix argument directs
this command to read a file name from the minibuffer.
Juri Linkov's avatar
Juri Linkov committed
550 551
A numeric prefix argument selects an Info buffer with the prefix number
appended to the Info buffer name.
Richard M. Stallman's avatar
Richard M. Stallman committed
552 553

The search path for Info files is in the variable `Info-directory-list'.
554
The top-level Info directory is made by combining all the files named `dir'
Richard M. Stallman's avatar
Richard M. Stallman committed
555
in all the directories in that path."
556 557 558 559 560 561 562 563
  (interactive (list
                (if (and current-prefix-arg (not (numberp current-prefix-arg)))
                    (read-file-name "Info file name: " nil nil t))
                (if (numberp current-prefix-arg)
                    (format "*info*<%s>" current-prefix-arg))))
  (pop-to-buffer (or buffer "*info*"))
  (if (and buffer (not (eq major-mode 'Info-mode)))
      (Info-mode))
Jim Blandy's avatar
Jim Blandy committed
564
  (if file
565 566 567 568
      ;; If argument already contains parentheses, don't add another set
      ;; since the argument will then be parsed improperly.  This also
      ;; has the added benefit of allowing node names to be included
      ;; following the parenthesized filename.
569 570 571 572
      (Info-goto-node
       (if (and (stringp file) (string-match "(.*)" file))
           file
         (concat "(" file ")")))
573
    (if (zerop (buffer-size))
Juri Linkov's avatar
Juri Linkov committed
574
        (Info-directory))))
Jim Blandy's avatar
Jim Blandy committed
575

576 577
;;;###autoload
(defun info-emacs-manual ()
578
  "Display the Emacs manual in Info mode."
579 580 581
  (interactive)
  (info "emacs"))

582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598
;;;###autoload
(defun info-standalone ()
  "Run Emacs as a standalone Info reader.
Usage:  emacs -f info-standalone [filename]
In standalone mode, \\<Info-mode-map>\\[Info-exit] exits Emacs itself."
  (setq Info-standalone t)
  (if (and command-line-args-left
	   (not (string-match "^-" (car command-line-args-left))))
      (condition-case err
	  (progn
	    (info (car command-line-args-left))
	    (setq command-line-args-left (cdr command-line-args-left)))
	(error (send-string-to-terminal
		(format "%s\n" (if (eq (car-safe err) 'error)
				   (nth 1 err) err)))
	       (save-buffers-kill-emacs)))
    (info)))
599

Stefan Monnier's avatar
Stefan Monnier committed
600
;; See if the accessible portion of the buffer begins with a node
601 602 603 604 605 606 607 608 609
;; delimiter, and the node header line which follows matches REGEXP.
;; Typically, this test will be followed by a loop that examines the
;; rest of the buffer with (search-forward "\n\^_"), and it's a pity
;; to have the overhead of this special test inside the loop.

;; This function changes match-data, but supposedly the caller might
;; want to use the results of re-search-backward.

;; The return value is the value of point at the beginning of matching
Stefan Monnier's avatar
Stefan Monnier committed
610
;; REGEXP, if the function succeeds, nil otherwise.
611
(defun Info-node-at-bob-matching (regexp)
612 613
  (and (bobp)				; are we at beginning of buffer?
       (looking-at "\^_")		; does it begin with node delimiter?
614 615 616
       (let (beg)
	 (forward-line 1)
	 (setq beg (point))
617
	 (forward-line 1)		; does the line after delimiter match REGEXP?
618 619
	 (re-search-backward regexp beg t))))

Juri Linkov's avatar
Juri Linkov committed
620 621 622 623
(defun Info-find-file (filename &optional noerror)
  "Return expanded FILENAME, or t, if FILENAME is \"dir\".
Optional second argument NOERROR, if t, means if file is not found
just return nil (no error)."
Jim Blandy's avatar
Jim Blandy committed
624 625
  ;; Convert filename to lower case if not found as specified.
  ;; Expand it.
626
  (if (stringp filename)
Jim Blandy's avatar
Jim Blandy committed
627
      (let (temp temp-downcase found)
628
        (setq filename (substitute-in-file-name filename))
Juri Linkov's avatar
Juri Linkov committed
629
	(cond
Jesper Harder's avatar
Jesper Harder committed
630 631 632 633
	 ((string= (downcase filename) "dir")
	  (setq found t))
	 ((string= filename "apropos")
	  (setq found 'apropos))
Juri Linkov's avatar
Juri Linkov committed
634 635 636 637
	 ((string= filename "history")
	  (setq found 'history))
	 ((string= filename "toc")
	  (setq found 'toc))
Jesper Harder's avatar
Jesper Harder committed
638 639
	 (t
	  (let ((dirs (if (string-match "^\\./" filename)
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
                          ;; If specified name starts with `./'
                          ;; then just try current directory.
                          '("./")
                        (if (file-name-absolute-p filename)
                            ;; No point in searching for an
                            ;; absolute file name
                            '(nil)
                          (if Info-additional-directory-list
                              (append Info-directory-list
                                      Info-additional-directory-list)
                            Info-directory-list)))))
            ;; Search the directory list for file FILENAME.
            (while (and dirs (not found))
              (setq temp (expand-file-name filename (car dirs)))
              (setq temp-downcase
                    (expand-file-name (downcase filename) (car dirs)))
              ;; Try several variants of specified name.
657
              (let ((suffix-list Info-suffix-list)
658 659 660
		    (lfn (if (fboundp 'msdos-long-file-names)
			     (msdos-long-file-names)
			   t)))
661 662 663
                (while (and suffix-list (not found))
                  (cond ((info-file-exists-p
                          (info-insert-file-contents-1
664
                           temp (car (car suffix-list)) lfn))
665 666 667
                         (setq found temp))
                        ((info-file-exists-p
                          (info-insert-file-contents-1
668 669 670 671 672 673 674 675
                           temp-downcase (car (car suffix-list)) lfn))
                         (setq found temp-downcase))
			((and (fboundp 'msdos-long-file-names)
			      lfn
			      (info-file-exists-p
			       (info-insert-file-contents-1
				temp (car (car suffix-list)) nil)))
			 (setq found temp)))
676
                  (setq suffix-list (cdr suffix-list))))
Jesper Harder's avatar
Jesper Harder committed
677
              (setq dirs (cdr dirs))))))
678 679
        (if found
            (setq filename found)
Juri Linkov's avatar
Juri Linkov committed
680 681 682 683 684 685
          (if noerror
              (setq filename nil)
            (error "Info file %s does not exist" filename)))
        filename)))

(defun Info-find-node (filename nodename &optional no-going-back)
686
  "Go to an Info node specified as separate FILENAME and NODENAME.
Juri Linkov's avatar
Juri Linkov committed
687 688 689 690
NO-GOING-BACK is non-nil if recovering from an error in this function;
it says do not attempt further (recursive) error recovery."
  (info-initialize)
  (setq filename (Info-find-file filename))
691
  ;; Go into Info buffer.
692
  (or (eq major-mode 'Info-mode) (pop-to-buffer "*info*"))
693 694 695 696 697
  ;; Record the node we are leaving.
  (if (and Info-current-file (not no-going-back))
      (setq Info-history
            (cons (list Info-current-file Info-current-node (point))
                  Info-history)))
698 699 700
  (Info-find-node-2 filename nodename no-going-back))

(defun Info-on-current-buffer (&optional nodename)
701
  "Use the `Info-mode' to browse the current Info buffer.
702
If a prefix arg is provided, it queries for the NODENAME which
703
else defaults to \"Top\"."
704 705 706
  (interactive
   (list (if current-prefix-arg
	     (completing-read "Node name: " (Info-build-node-completions)
707 708
			      nil t "Top"))))
  (unless nodename (setq nodename "Top"))
709
  (info-initialize)
710 711 712 713
  (Info-mode)
  (set (make-local-variable 'Info-current-file) t)
  (Info-find-node-2 nil nodename))

714 715 716 717 718
;; It's perhaps a bit nasty to kill the *info* buffer to force a re-read,
;; but at least it keeps this routine (which is only for the benefit of
;; makeinfo-buffer) out of the way of normal operations.
;;
(defun Info-revert-find-node (filename nodename)
719
  "Go to an Info node FILENAME and NODENAME, re-reading disk contents.
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
When *info* is already displaying FILENAME and NODENAME, the window position
is preserved, if possible."
  (pop-to-buffer "*info*")
  (let ((old-filename Info-current-file)
	(old-nodename Info-current-node)
	(pcolumn      (current-column))
	(pline        (count-lines (point-min) (line-beginning-position)))
	(wline        (count-lines (point-min) (window-start)))
	(old-history  Info-history)
	(new-history (and Info-current-file
			  (list Info-current-file Info-current-node (point)))))
    (kill-buffer (current-buffer))
    (Info-find-node filename nodename)
    (setq Info-history old-history)
    (if (and (equal old-filename Info-current-file)
	     (equal old-nodename Info-current-node))
	(progn
	  ;; note goto-line is no good, we want to measure from point-min
738
	  (goto-char (point-min))
739 740
	  (forward-line wline)
	  (set-window-start (selected-window) (point))
741
	  (goto-char (point-min))
742 743 744 745 746 747
	  (forward-line pline)
	  (move-to-column pcolumn))
      ;; only add to the history when coming from a different file+node
      (if new-history
	  (setq Info-history (cons new-history Info-history))))))

748 749 750 751 752 753 754 755 756 757
(defun Info-find-in-tag-table-1 (marker regexp case-fold)
  "Find a node in a tag table.
MARKER specifies the buffer and position to start searching at.
REGEXP is a regular expression matching nodes or references.  Its first
group should match `Node:' or `Ref:'.
CASE-FOLD t means search for a case-insensitive match.
If a match was found, value is a list (FOUND-ANCHOR POS MODE), where
FOUND-ANCHOR is non-nil if a `Ref:' was matched, POS is the position
where the match was found, and MODE is `major-mode' of the buffer in
which the match was found."
758
  (let ((case-fold-search case-fold))
759 760 761
    (save-excursion
      (set-buffer (marker-buffer marker))
      (goto-char marker)
762

763 764 765 766
      ;; Search tag table
      (beginning-of-line)
      (when (re-search-forward regexp nil t)
	(list (string-equal "Ref:" (match-string 1))
767
	      (+ (point-min) (read (current-buffer)))
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
	      major-mode)))))

(defun Info-find-in-tag-table (marker regexp)
  "Find a node in a tag table.
MARKER specifies the buffer and position to start searching at.
REGEXP is a regular expression matching nodes or references.  Its first
group should match `Node:' or `Ref:'.
If a match was found, value is a list (FOUND-ANCHOR POS MODE), where
FOUND-ANCHOR is non-nil if a `Ref:' was matched, POS is the position
where the match was found, and MODE is `major-mode' of the buffer in
which the match was found.
This function tries to find a case-sensitive match first, then a
case-insensitive match is tried."
  (let ((result (Info-find-in-tag-table-1 marker regexp nil)))
    (when (null (car result))
      (setq result (Info-find-in-tag-table-1 marker regexp t)))
    result))

(defun Info-find-node-in-buffer-1 (regexp case-fold)
  "Find a node or anchor in the current buffer.
REGEXP is a regular expression matching nodes or references.  Its first
group should match `Node:' or `Ref:'.
CASE-FOLD t means search for a case-insensitive match.
Value is the position at which a match was found, or nil if not found."
  (let ((case-fold-search case-fold)
	found)
    (save-excursion
      (when (Info-node-at-bob-matching regexp)
	(setq found (point)))
      (while (and (not found)
		  (search-forward "\n\^_" nil t))
	(forward-line 1)
	(let ((beg (point)))
	  (forward-line 1)
	  (when (re-search-backward regexp beg t)
	    (beginning-of-line)
	    (setq found (point)))))
      found)))
806

807 808 809 810 811 812 813 814 815
(defun Info-find-node-in-buffer (regexp)
  "Find a node or anchor in the current buffer.
REGEXP is a regular expression matching nodes or references.  Its first
group should match `Node:' or `Ref:'.
Value is the position at which a match was found, or nil if not found.
This function looks for a case-sensitive match first.  If none is found,
a case-insensitive match is tried."
  (or (Info-find-node-in-buffer-1 regexp nil)
      (Info-find-node-in-buffer-1 regexp t)))
816

817
(defun Info-find-node-2 (filename nodename &optional no-going-back)
818
  (buffer-disable-undo (current-buffer))
Jim Blandy's avatar
Jim Blandy committed
819 820 821 822 823
  (or (eq major-mode 'Info-mode)
      (Info-mode))
  (widen)
  (setq Info-current-node nil)
  (unwind-protect
824 825
      (let ((case-fold-search t)
	    anchorpos)
826 827 828 829 830 831 832 833 834
        ;; Switch files if necessary
        (or (null filename)
            (equal Info-current-file filename)
            (let ((buffer-read-only nil))
              (setq Info-current-file nil
                    Info-current-subfile nil
                    Info-current-file-completions nil
                    buffer-file-name nil)
              (erase-buffer)
Jesper Harder's avatar
Jesper Harder committed
835 836 837 838 839
	      (cond
	       ((eq filename t)
		(Info-insert-dir))
	       ((eq filename 'apropos)
		(insert-buffer-substring " *info-apropos*"))
Juri Linkov's avatar
Juri Linkov committed
840 841 842 843
	       ((eq filename 'history)
		(insert-buffer-substring " *info-history*"))
	       ((eq filename 'toc)
		(insert-buffer-substring " *info-toc*"))
Jesper Harder's avatar
Jesper Harder committed
844
	       (t
845
                (info-insert-file-contents filename nil)
Jesper Harder's avatar
Jesper Harder committed
846
                (setq default-directory (file-name-directory filename))))
847
              (set-buffer-modified-p nil)
848 849 850 851 852 853 854 855 856 857 858 859 860

	      ;; Check makeinfo version for index cookie support
	      (let ((found nil))
		(goto-char (point-min))
		(condition-case ()
		    (if (and (re-search-forward
			      "makeinfo version \\([0-9]+.[0-9]+\\)"
			      (line-beginning-position 3) t)
			     (not (version< (match-string 1) "4.7")))
			(setq found t))
		  (error nil))
		(set (make-local-variable 'Info-file-supports-index-cookies) found))

861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
              ;; See whether file has a tag table.  Record the location if yes.
              (goto-char (point-max))
              (forward-line -8)
              ;; Use string-equal, not equal, to ignore text props.
              (if (not (or (string-equal nodename "*")
                           (not
                            (search-forward "\^_\nEnd tag table\n" nil t))))
                  (let (pos)
                    ;; We have a tag table.  Find its beginning.
                    ;; Is this an indirect file?
                    (search-backward "\nTag table:\n")
                    (setq pos (point))
                    (if (save-excursion
                          (forward-line 2)
                          (looking-at "(Indirect)\n"))
                        ;; It is indirect.  Copy it to another buffer
                        ;; and record that the tag table is in that buffer.
                        (let ((buf (current-buffer))
                              (tagbuf
                               (or Info-tag-table-buffer
                                   (generate-new-buffer " *info tag table*"))))
                          (setq Info-tag-table-buffer tagbuf)
                          (save-excursion
                            (set-buffer tagbuf)
885
                            (buffer-disable-undo (current-buffer))
886 887 888 889 890 891 892 893
                            (setq case-fold-search t)
                            (erase-buffer)
                            (insert-buffer-substring buf))
                          (set-marker Info-tag-table-marker
                                      (match-end 0) tagbuf))
                      (set-marker Info-tag-table-marker pos)))
                (set-marker Info-tag-table-marker nil))
              (setq Info-current-file
Jesper Harder's avatar
Jesper Harder committed
894 895 896
		    (cond
		     ((eq filename t) "dir")
		     ((eq filename 'apropos) "apropos")
Juri Linkov's avatar
Juri Linkov committed
897 898
		     ((eq filename 'history) "history")
		     ((eq filename 'toc) "toc")
Jesper Harder's avatar
Jesper Harder committed
899 900
		     (t filename)))
	      ))
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
        ;; Use string-equal, not equal, to ignore text props.
        (if (string-equal nodename "*")
            (progn (setq Info-current-node nodename)
                   (Info-set-mode-line))
          ;; Possibilities:
          ;;
          ;; 1. Anchor found in tag table
          ;; 2. Anchor *not* in tag table
          ;;
          ;; 3. Node found in tag table
          ;; 4. Node *not* found in tag table, but found in file
          ;; 5. Node *not* in tag table, and *not* in file
          ;;
          ;; *Or* the same, but in an indirect subfile.

          ;; Search file for a suitable node.
917
	  (let ((guesspos (point-min))
918
		(regexp (concat "\\(Node:\\|Ref:\\) *\\("
919
				(if (stringp nodename)
920 921
				    (regexp-quote nodename)
				  "")
922
				"\\) *[,\t\n\177]")))
923

924
	    (catch 'foo
925

926
	      ;; First, search a tag table, if any
927 928 929
	      (when (marker-position Info-tag-table-marker)
		(let* ((m Info-tag-table-marker)
		       (found (Info-find-in-tag-table m regexp)))
930

931 932 933
		  (when found
		    ;; FOUND is (ANCHOR POS MODE).
		    (setq guesspos (nth 1 found))
934

935 936 937 938 939 940 941
		    ;; If this is an indirect file, determine which
		    ;; file really holds this node and read it in.
		    (unless (eq (nth 2 found) 'Info-mode)
		      ;; Note that the current buffer must be the
		      ;; *info* buffer on entry to
		      ;; Info-read-subfile.  Thus the hackery above.
		      (setq guesspos (Info-read-subfile guesspos)))
942 943

		    ;; Handle anchor
944 945 946
		    (when (nth 0 found)
		      (goto-char (setq anchorpos guesspos))
		      (throw 'foo t)))))
947 948 949 950

	      ;; Else we may have a node, which we search for:
	      (goto-char (max (point-min)
			      (- (byte-to-position guesspos) 1000)))
951

952 953 954 955 956 957 958
	      ;; Now search from our advised position (or from beg of
	      ;; buffer) to find the actual node.  First, check
	      ;; whether the node is right where we are, in case the
	      ;; buffer begins with a node.
	      (let ((pos (Info-find-node-in-buffer regexp)))
		(when pos
		  (goto-char pos)
959 960 961 962 963 964 965 966 967 968 969
		  (throw 'foo t)))

              (when (string-match "\\([^.]+\\)\\." nodename)
                (let (Info-point-loc)
                  (Info-find-node-2
                   filename (match-string 1 nodename) no-going-back))
                (widen)
                (throw 'foo t))

              ;; No such anchor in tag table or node in tag table or file
              (error "No such node or anchor: %s" nodename))
970 971

	    (Info-select-node)
Juri Linkov's avatar
Juri Linkov committed
972 973 974 975 976 977 978 979 980
	    (goto-char (point-min))
	    (cond (anchorpos
                   (let ((new-history (list Info-current-file
                                            (substring-no-properties nodename))))
                     ;; Add anchors to the history too
                     (setq Info-history-list
                           (cons new-history
                                 (delete new-history Info-history-list))))
                   (goto-char anchorpos))
981 982 983 984 985 986
                  ((numberp Info-point-loc)
                   (forward-line (1- Info-point-loc))
                   (setq Info-point-loc nil))
		  ((stringp Info-point-loc)
		   (Info-find-index-name Info-point-loc)
		   (setq Info-point-loc nil))))))
Jim Blandy's avatar
Jim Blandy committed
987 988
    ;; If we did not finish finding the specified node,
    ;; go back to the previous one.
989
    (or Info-current-node no-going-back (null Info-history)
990 991 992 993
        (let ((hist (car Info-history)))
          (setq Info-history (cdr Info-history))
          (Info-find-node (nth 0 hist) (nth 1 hist) t)
          (goto-char (nth 2 hist))))))
Jim Blandy's avatar
Jim Blandy committed
994

995 996
;; Cache the contents of the (virtual) dir file, once we have merged
;; it for the first time, so we can save time subsequently.
997 998
(defvar Info-dir-contents nil)

999 1000 1001 1002
;; Cache for the directory we decided to use for the default-directory
;; of the merged dir text.
(defvar Info-dir-contents-directory nil)

1003 1004 1005 1006
;; Record the file attributes of all the files from which we
;; constructed Info-dir-contents.
(defvar Info-dir-file-attributes nil)

1007 1008
(defvar Info-dir-file-name nil)

1009
;; Construct the Info directory node by merging the files named `dir'
1010 1011 1012
;; from various directories.  Set the *info* buffer's
;; default-directory to the first directory we actually get any text
;; from.
1013
(defun Info-insert-dir ()
1014 1015 1016 1017
  (if (and Info-dir-contents Info-dir-file-attributes
	   ;; Verify that none of the files we used has changed
	   ;; since we used it.
	   (eval (cons 'and
1018 1019 1020 1021 1022 1023 1024 1025 1026
		       (mapcar (lambda (elt)
				 (let ((curr (file-attributes
					      ;; Handle symlinks
					      (file-truename (car elt)))))

				   ;; Don't compare the access time.
				   (if curr (setcar (nthcdr 4 curr) 0))
				   (setcar (nthcdr 4 (cdr elt)) 0)
				   (equal (cdr elt) curr)))
1027
			       Info-dir-file-attributes))))
1028 1029 1030
      (progn
	(insert Info-dir-contents)
	(goto-char (point-min)))
1031
    (let ((dirs (if Info-additional-directory-list
Richard M. Stallman's avatar
Richard M. Stallman committed
1032 1033 1034
		    (append Info-directory-list
			    Info-additional-directory-list)
		  Info-directory-list))
1035
	  (dir-file-attrs nil)
1036 1037
	  ;; Bind this in case the user sets it to nil.
	  (case-fold-search t)
1038 1039
	  ;; This is set non-nil if we find a problem in some input files.
	  problems
1040
	  buffers buffer others nodes dirs-done)
1041 1042

      ;; Search the directory list for the directory file.
1043
      (while dirs
1044 1045 1046 1047 1048
	(let ((truename (file-truename (expand-file-name (car dirs)))))
	  (or (member truename dirs-done)
	      (member (directory-file-name truename) dirs-done)
	      ;; Try several variants of specified name.
	      ;; Try upcasing, appending `.info', or both.
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
	      (let* (file
		     (attrs
		      (or
		       (progn (setq file (expand-file-name "dir" truename))
			      (file-attributes file))
		       (progn (setq file (expand-file-name "DIR" truename))
			      (file-attributes file))
		       (progn (setq file (expand-file-name "dir.info" truename))
			      (file-attributes file))
		       (progn (setq file (expand-file-name "DIR.INFO" truename))
			      (file-attributes file)))))