info.el 159 KB
Newer Older
1
;;; info.el --- info package for Emacs
Eric S. Raymond's avatar
Eric S. Raymond committed
2

Stefan Monnier's avatar
Stefan Monnier committed
3
;; Copyright (C) 1985,86,92,93,94,95,96,97,98,99,2000,01,02,03,2004
4
;;  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 23 24
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
Jim Blandy's avatar
Jim Blandy committed
25

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

Erik Naggum's avatar
Erik Naggum committed
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 41 42 43 44 45
(defgroup info nil
  "Info subsystem"
  :group 'help
  :group 'docs)


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

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

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

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 61 62
This is convenient if you want to write info files by hand.
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 79
  "Face for Info node names."
  :group 'info)

(defface info-menu-5
80 81
  '((((class color)) :foreground "red1")
    (t :underline t))
82
  "Face for every third `*' in an Info menu."
83 84 85
  :group 'info)

(defface info-xref
86 87
  '((((class color) (background light)) :foreground "blue" :underline t)
    (((class color) (background dark)) :foreground "cyan" :underline t)
88
    (t :underline t))
89 90 91
  "Face for Info cross-references."
  :group 'info)

Juri Linkov's avatar
Juri Linkov committed
92
(defface info-xref-visited
93
  '((default :inherit info-xref)
94
    (((class color) (background light)) :foreground "magenta4")
95
    (((class color) (background dark)) :foreground "magenta3")) ;"violet"?
Juri Linkov's avatar
Juri Linkov committed
96 97 98 99 100
  "Face for visited Info cross-references."
  :group 'info)

(defcustom Info-fontify-visited-nodes t
  "*Non-nil means to fontify visited nodes in a different face."
101
  :version "22.1"
Juri Linkov's avatar
Juri Linkov committed
102 103 104
  :type 'boolean
  :group 'info)

105
(defcustom Info-fontify-maximum-menu-size 100000
106
  "*Maximum size of menu to fontify if `font-lock-mode' is non-nil."
107 108
  :type 'integer
  :group 'info)
109

Miles Bader's avatar
Miles Bader committed
110
(defcustom Info-use-header-line t
111
  "*Non-nil means to put the beginning-of-node links in an Emacs header-line.
Miles Bader's avatar
Miles Bader committed
112 113 114 115 116
A header-line does not scroll with the rest of the buffer."
  :type 'boolean
  :group 'info)

(defface info-header-xref
117
  '((t :inherit info-xref))
Miles Bader's avatar
Miles Bader committed
118 119 120 121
  "Face for Info cross-references in a node header."
  :group 'info)

(defface info-header-node
122
  '((t :inherit info-node))
Miles Bader's avatar
Miles Bader committed
123 124 125
  "Face for Info nodes in a node header."
  :group 'info)

126
(defvar Info-directory-list nil
Jim Blandy's avatar
Jim Blandy committed
127
  "List of directories to search for Info documentation files.
128
If nil, meaning not yet initialized, Info uses the environment
129
variable INFOPATH to initialize it, or `Info-default-directory-list'
130 131
if there is no INFOPATH variable in the environment, or the
concatenation of the two if INFOPATH ends with a colon.
132 133

When `Info-directory-list' is initialized from the value of
134 135 136 137 138 139 140
`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
141 142
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
143 144 145 146 147 148
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.
149 150

If you run the Emacs executable from the `src' directory in the Emacs
151 152 153 154
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
155

156
(defcustom Info-additional-directory-list nil
157
  "List of additional directories to search for Info documentation files.
158
These directories are searched after those in `Info-directory-list'."
159 160
  :type '(repeat directory)
  :group 'info)
161

162
(defcustom Info-scroll-prefer-subnodes nil
163 164 165 166 167 168 169 170 171
  "*If non-nil, \\<Info-mode-map>\\[Info-scroll-up] in a menu visits subnodes.
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."
172
  :version "22.1"
173 174 175
  :type 'boolean
  :group 'info)

176
(defcustom Info-hide-note-references t
177
  "*If non-nil, hide the tag and section reference in *note and * menu items.
Juri Linkov's avatar
Juri Linkov committed
178 179
If value is non-nil but not `hide', also replaces the \"*note\" with \"see\".
If value is non-nil but not t or `hide', the reference section is still shown."
180
  :version "22.1"
Juri Linkov's avatar
Juri Linkov committed
181
  :type '(choice (const :tag "No hiding" nil)
182
		 (const :tag "Replace tag and hide reference" t)
Juri Linkov's avatar
Juri Linkov committed
183 184
		 (const :tag "Hide tag and reference" hide)
		 (other :tag "Only replace tag" tag))
185 186
  :group 'info)

Kim F. Storm's avatar
Kim F. Storm committed
187 188 189 190
(defcustom Info-refill-paragraphs nil
  "*If non-nil, attempt to refill paragraphs with hidden references.
This refilling may accidentally remove explicit line breaks in the info
file, so be prepared for a few surprises if you enable this feature."
191
  :version "22.1"
Kim F. Storm's avatar
Kim F. Storm committed
192 193 194
  :type 'boolean
  :group 'info)

195
(defcustom Info-search-whitespace-regexp "\\s-+"
Juri Linkov's avatar
Juri Linkov committed
196 197 198 199 200 201 202 203
  "*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)

204 205 206 207
(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
208 209 210 211 212 213
  "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
214 215 216
  :type 'hook
  :group 'info)

Juri Linkov's avatar
Juri Linkov committed
217 218 219
(defvar Info-edit-mode-hook nil
  "Hooks run when `Info-edit-mode' is called.")

Jim Blandy's avatar
Jim Blandy committed
220
(defvar Info-current-file nil
221 222
  "Info file that Info is now looking at, or nil.
This is the name that was specified in Info, not the actual file name.
223 224
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
225 226

(defvar Info-current-subfile nil
Dave Love's avatar
Dave Love committed
227 228
  "Info subfile that is actually in the *info* buffer now.
nil if current info file is not split into subfiles.")
Jim Blandy's avatar
Jim Blandy committed
229 230 231 232

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

233
(defvar Info-tag-table-marker nil
Jim Blandy's avatar
Jim Blandy committed
234 235 236
  "Marker pointing at beginning of current Info file's tag table.
Marker points nowhere if file has no tag table.")

237 238 239
(defvar Info-tag-table-buffer nil
  "Buffer used for indirect tag tables.")

240 241 242
(defvar Info-current-file-completions nil
  "Cached completion list for current Info file.")

243
(defvar Info-index-alternatives nil
Dave Love's avatar
Dave Love committed
244
  "List of possible matches for last `Info-index' command.")
245

246 247 248 249 250
(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
251

252 253
(defvar Info-standalone nil
  "Non-nil if Emacs was started solely as an Info browser.")
254

255
(defvar Info-suffix-list
256 257
  ;; The MS-DOS list should work both when long file names are
  ;; supported (Windows 9X), and when only 8+3 file names are available.
258 259 260
  (if (eq system-type 'ms-dos)
      '( (".gz"      . "gunzip")
	 (".z"       . "gunzip")
261
	 (".bz2"     . ("bzip2" "-dc"))
262 263 264 265 266 267 268 269
	 (".inz"     . "gunzip")
	 (".igz"     . "gunzip")
	 (".info.Z"  . "gunzip")
	 (".info.gz" . "gunzip")
	 ("-info.Z"  . "gunzip")
	 ("-info.gz" . "gunzip")
	 ("/index.gz". "gunzip")
	 ("/index.z" . "gunzip")
270
	 (".inf"     . nil)
271 272 273
	 (".info"    . nil)
	 ("-info"    . nil)
	 ("/index"   . nil)
274
	 (""         . nil))
275 276 277 278
    '( (".info.Z".    "uncompress")
       (".info.Y".    "unyabba")
       (".info.gz".   "gunzip")
       (".info.z".    "gunzip")
279
       (".info.bz2" . ("bzip2" "-dc"))
280 281 282 283
       (".info".      nil)
       ("-info.Z".   "uncompress")
       ("-info.Y".   "unyabba")
       ("-info.gz".  "gunzip")
284
       ("-info.bz2" . ("bzip2" "-dc"))
285 286 287 288 289 290
       ("-info.z".   "gunzip")
       ("-info".     nil)
       ("/index.Z".   "uncompress")
       ("/index.Y".   "unyabba")
       ("/index.gz".  "gunzip")
       ("/index.z".   "gunzip")
291
       ("/index.bz2". ("bzip2" "-dc"))
292 293 294 295 296
       ("/index".     nil)
       (".Z".         "uncompress")
       (".Y".         "unyabba")
       (".gz".        "gunzip")
       (".z".         "gunzip")
297
       (".bz2" .      ("bzip2" "-dc"))
298
       ("".           nil)))
299 300
  "List of file name suffixes and associated decoding commands.
Each entry should be (SUFFIX . STRING); the file is given to
301 302 303 304 305 306
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.
307 308
Because the SUFFIXes are tried in order, the empty string should
be last in the list.")
309

310
;; Concatenate SUFFIX onto FILENAME.  SUFFIX should start with a dot.
311 312 313 314
;; 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
315 316
      (concat filename suffix)
    (let* ((sans-exts (file-name-sans-extension filename))
317 318 319
	   ;; How long is the extension in FILENAME (not counting the dot).
	   (ext-len (max 0 (- (length filename) (length sans-exts) 1)))
	   ext-left)
320
      ;; SUFFIX starts with a dot.  If FILENAME already has one,
321
      ;; get rid of the one in SUFFIX (unless suffix is empty).
322
      (or (and (<= ext-len 0)
323
	       (not (eq (aref filename (1- (length filename))) ?.)))
324
	  (= (length suffix) 0)
325
	  (setq suffix (substring suffix 1)))
326 327
      ;; How many chars of that extension should we keep?
      (setq ext-left (min ext-len (max 0 (- 3 (length suffix)))))
328 329 330 331 332
      ;; Get rid of the rest of the extension, and add SUFFIX.
      (concat (substring filename 0 (- (length filename)
				       (- ext-len ext-left)))
	      suffix))))

333 334 335 336
(defun info-file-exists-p (filename)
  (and (file-exists-p filename)
       (not (file-directory-p filename))))

337 338 339
(defun info-insert-file-contents (filename &optional visit)
  "Insert the contents of an info file in the current buffer.
Do the right thing if the file has been compressed or zipped."
340
  (let* ((tail Info-suffix-list)
341 342 343
	 (lfn (if (fboundp 'msdos-long-file-names)
		  (msdos-long-file-names)
		t))
344 345 346
	 (check-short (and (fboundp 'msdos-long-file-names)
			   lfn))
	 fullname decoder done)
347
    (if (info-file-exists-p filename)
348 349
	;; FILENAME exists--see if that name contains a suffix.
	;; If so, set DECODE accordingly.
350 351 352 353 354 355 356 357
	(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))))
358
      ;; Try adding suffixes to FILENAME and see if we can find something.
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
      (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))))))
375 376
	(setq tail (cdr tail)))
      (or tail
377
	  (error "Can't find %s or any compressed version of it" filename)))
378 379 380 381 382
    ;; check for conflict with jka-compr
    (if (and (featurep 'jka-compr)
	     (jka-compr-installed-p)
	     (jka-compr-get-compression-info fullname))
	(setq decoder nil))
383
    (if decoder
384 385 386 387 388 389
	(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)))
390 391 392 393
	    (or (consp decoder)
		(setq decoder (list decoder)))
	    (apply 'call-process-region (point-min) (point-max)
		   (car decoder) t t nil (cdr decoder))))
394
      (insert-file-contents fullname visit))))
395

396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433
(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
434 435 436
	    ;; Don't drop the last part, it might contain non-Emacs stuff.
	    ;; (reverse (cdr (reverse
	    Info-default-directory-list)))) ;; )))
437

438
(defun info-initialize ()
Dave Love's avatar
Dave Love committed
439
  "Initialize `Info-directory-list', if that hasn't been done yet."
440
  (unless Info-directory-list
441
    (let ((path (getenv "INFOPATH")))
442
      (setq Info-directory-list
443 444
	    (prune-directory-list
	     (if path
445 446 447 448 449 450
		 (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)))))))
451

452 453 454 455 456
;;;###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))))
457
  (let (same-window-buffer-names same-window-regexps)
458
    (info file)))
459

460
;;;###autoload (add-hook 'same-window-regexps "\\*info\\*\\(\\|<[0-9]+>\\)")
461

462
;;;###autoload (put 'info 'info-file "emacs")
Jim Blandy's avatar
Jim Blandy committed
463
;;;###autoload
464
(defun info (&optional file buffer)
Jim Blandy's avatar
Jim Blandy committed
465 466 467
  "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
468 469
Called from a program, FILE may specify an Info node of the form
`(FILENAME)NODENAME'.
470 471 472 473
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
474

475 476
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
477 478
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
479 480

The search path for Info files is in the variable `Info-directory-list'.
481
The top-level Info directory is made by combining all the files named `dir'
Richard M. Stallman's avatar
Richard M. Stallman committed
482
in all the directories in that path."
483 484 485 486 487 488 489 490
  (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
491
  (if file
492 493 494 495 496 497 498 499
      ;; 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.
      (if (and (stringp file) (string-match "(.*)" file))
	  (Info-goto-node file)
	(Info-goto-node (concat "(" file ")")))
    (if (zerop (buffer-size))
Juri Linkov's avatar
Juri Linkov committed
500
        (Info-directory))))
Jim Blandy's avatar
Jim Blandy committed
501

502 503
;;;###autoload
(defun info-emacs-manual ()
504
  "Display the Emacs manual in Info mode."
505 506 507
  (interactive)
  (info "emacs"))

508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524
;;;###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)))
525

Stefan Monnier's avatar
Stefan Monnier committed
526
;; See if the accessible portion of the buffer begins with a node
527 528 529 530 531 532 533 534 535
;; 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
536
;; REGEXP, if the function succeeds, nil otherwise.
537
(defun Info-node-at-bob-matching (regexp)
538 539
  (and (bobp)				; are we at beginning of buffer?
       (looking-at "\^_")		; does it begin with node delimiter?
540 541 542
       (let (beg)
	 (forward-line 1)
	 (setq beg (point))
543
	 (forward-line 1)		; does the line after delimiter match REGEXP?
544 545
	 (re-search-backward regexp beg t))))

Juri Linkov's avatar
Juri Linkov committed
546 547 548 549
(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
550 551
  ;; Convert filename to lower case if not found as specified.
  ;; Expand it.
552
  (if (stringp filename)
Jim Blandy's avatar
Jim Blandy committed
553
      (let (temp temp-downcase found)
554
        (setq filename (substitute-in-file-name filename))
Juri Linkov's avatar
Juri Linkov committed
555
	(cond
Jesper Harder's avatar
Jesper Harder committed
556 557 558 559
	 ((string= (downcase filename) "dir")
	  (setq found t))
	 ((string= filename "apropos")
	  (setq found 'apropos))
Juri Linkov's avatar
Juri Linkov committed
560 561 562 563
	 ((string= filename "history")
	  (setq found 'history))
	 ((string= filename "toc")
	  (setq found 'toc))
Jesper Harder's avatar
Jesper Harder committed
564 565
	 (t
	  (let ((dirs (if (string-match "^\\./" filename)
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
                          ;; 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.
583
              (let ((suffix-list Info-suffix-list)
584 585 586
		    (lfn (if (fboundp 'msdos-long-file-names)
			     (msdos-long-file-names)
			   t)))
587 588 589
                (while (and suffix-list (not found))
                  (cond ((info-file-exists-p
                          (info-insert-file-contents-1
590
                           temp (car (car suffix-list)) lfn))
591 592 593
                         (setq found temp))
                        ((info-file-exists-p
                          (info-insert-file-contents-1
594 595 596 597 598 599 600 601
                           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)))
602
                  (setq suffix-list (cdr suffix-list))))
Jesper Harder's avatar
Jesper Harder committed
603
              (setq dirs (cdr dirs))))))
604 605
        (if found
            (setq filename found)
Juri Linkov's avatar
Juri Linkov committed
606 607 608 609 610 611 612 613 614 615 616
          (if noerror
              (setq filename nil)
            (error "Info file %s does not exist" filename)))
        filename)))

(defun Info-find-node (filename nodename &optional no-going-back)
  "Go to an info node specified as separate FILENAME and NODENAME.
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))
617 618 619 620 621
  ;; 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)))
Jim Blandy's avatar
Jim Blandy committed
622
  ;; Go into info buffer.
623
  (or (eq major-mode 'Info-mode) (pop-to-buffer "*info*"))
624 625 626 627 628
  (Info-find-node-2 filename nodename no-going-back))

(defun Info-on-current-buffer (&optional nodename)
  "Use the `Info-mode' to browse the current info buffer.
If a prefix arg is provided, it queries for the NODENAME which
629
else defaults to \"Top\"."
630 631 632
  (interactive
   (list (if current-prefix-arg
	     (completing-read "Node name: " (Info-build-node-completions)
633 634
			      nil t "Top"))))
  (unless nodename (setq nodename "Top"))
635
  (info-initialize)
636 637 638 639
  (Info-mode)
  (set (make-local-variable 'Info-current-file) t)
  (Info-find-node-2 nil nodename))

640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
;; 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)
  "Go to an info node FILENAME and NODENAME, re-reading disk contents.
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
664
	  (goto-char (point-min))
665 666
	  (forward-line wline)
	  (set-window-start (selected-window) (point))
667
	  (goto-char (point-min))
668 669 670 671 672 673
	  (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))))))

674 675 676 677 678 679 680 681 682 683
(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."
684
  (let ((case-fold-search case-fold))
685 686 687
    (save-excursion
      (set-buffer (marker-buffer marker))
      (goto-char marker)
688

689 690 691 692
      ;; Search tag table
      (beginning-of-line)
      (when (re-search-forward regexp nil t)
	(list (string-equal "Ref:" (match-string 1))
693
	      (+ (point-min) (read (current-buffer)))
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
	      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)))
732

733 734 735 736 737 738 739 740 741
(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)))
742

743
(defun Info-find-node-2 (filename nodename &optional no-going-back)
744
  (buffer-disable-undo (current-buffer))
Jim Blandy's avatar
Jim Blandy committed
745 746 747 748 749
  (or (eq major-mode 'Info-mode)
      (Info-mode))
  (widen)
  (setq Info-current-node nil)
  (unwind-protect
750 751
      (let ((case-fold-search t)
	    anchorpos)
752 753 754 755 756 757 758 759 760
        ;; 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
761 762 763 764 765
	      (cond
	       ((eq filename t)
		(Info-insert-dir))
	       ((eq filename 'apropos)
		(insert-buffer-substring " *info-apropos*"))
Juri Linkov's avatar
Juri Linkov committed
766 767 768 769
	       ((eq filename 'history)
		(insert-buffer-substring " *info-history*"))
	       ((eq filename 'toc)
		(insert-buffer-substring " *info-toc*"))
Jesper Harder's avatar
Jesper Harder committed
770
	       (t
771
                (info-insert-file-contents filename nil)
Jesper Harder's avatar
Jesper Harder committed
772
                (setq default-directory (file-name-directory filename))))
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
              (set-buffer-modified-p nil)
              ;; 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)
798
                            (buffer-disable-undo (current-buffer))
799 800 801 802 803 804 805 806
                            (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
807 808 809
		    (cond
		     ((eq filename t) "dir")
		     ((eq filename 'apropos) "apropos")
Juri Linkov's avatar
Juri Linkov committed
810 811
		     ((eq filename 'history) "history")
		     ((eq filename 'toc) "toc")
Jesper Harder's avatar
Jesper Harder committed
812 813
		     (t filename)))
	      ))
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
        ;; 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.
830
	  (let ((guesspos (point-min))
831
		(regexp (concat "\\(Node:\\|Ref:\\) *\\("
832
				(if (stringp nodename)
833 834
				    (regexp-quote nodename)
				  "")
835
				"\\) *[,\t\n\177]")))
836

837
	    (catch 'foo
838

839
	      ;; First, search a tag table, if any
840 841 842
	      (when (marker-position Info-tag-table-marker)
		(let* ((m Info-tag-table-marker)
		       (found (Info-find-in-tag-table m regexp)))
843

844 845 846
		  (when found
		    ;; FOUND is (ANCHOR POS MODE).
		    (setq guesspos (nth 1 found))
847

848 849 850 851 852 853 854
		    ;; 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)))
855 856

		    ;; Handle anchor
857 858 859
		    (when (nth 0 found)
		      (goto-char (setq anchorpos guesspos))
		      (throw 'foo t)))))
860 861 862 863

	      ;; Else we may have a node, which we search for:
	      (goto-char (max (point-min)
			      (- (byte-to-position guesspos) 1000)))
864

865 866 867 868 869 870 871
	      ;; 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)
872 873 874 875 876 877 878 879 880 881 882
		  (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))
883 884

	    (Info-select-node)
Juri Linkov's avatar
Juri Linkov committed
885 886 887 888 889 890 891 892 893
	    (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))
894 895 896 897 898 899
                  ((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
900 901
    ;; If we did not finish finding the specified node,
    ;; go back to the previous one.
902
    (or Info-current-node no-going-back (null Info-history)
903 904 905 906
        (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
907

908 909
;; Cache the contents of the (virtual) dir file, once we have merged
;; it for the first time, so we can save time subsequently.
910 911
(defvar Info-dir-contents nil)

912 913 914 915
;; Cache for the directory we decided to use for the default-directory
;; of the merged dir text.
(defvar Info-dir-contents-directory nil)

916 917 918 919
;; Record the file attributes of all the files from which we
;; constructed Info-dir-contents.
(defvar Info-dir-file-attributes nil)

920 921
(defvar Info-dir-file-name nil)

922
;; Construct the Info directory node by merging the files named `dir'
923 924 925
;; from various directories.  Set the *info* buffer's
;; default-directory to the first directory we actually get any text
;; from.
926
(defun Info-insert-dir ()
927 928 929 930
  (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
931 932 933 934 935 936 937 938 939
		       (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)))
940
			       Info-dir-file-attributes))))
941 942 943
      (progn
	(insert Info-dir-contents)
	(goto-char (point-min)))
944
    (let ((dirs (if Info-additional-directory-list
Richard M. Stallman's avatar
Richard M. Stallman committed
945 946 947
		    (append Info-directory-list
			    Info-additional-directory-list)
		  Info-directory-list))
948
	  (dir-file-attrs nil)
949 950
	  ;; Bind this in case the user sets it to nil.
	  (case-fold-search t)
951 952
	  ;; This is set non-nil if we find a problem in some input files.
	  problems
953
	  buffers buffer others nodes dirs-done)
954 955

      ;; Search the directory list for the directory file.
956
      (while dirs
957 958 959 960 961
	(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.
962 963 964 965 966 967 968 969 970 971 972
	      (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)))))
973 974 975 976
		(setq dirs-done
		      (cons truename
			    (cons (directory-file-name truename)
				  dirs-done)))
977 978 979 980
		(if attrs
		    (save-excursion
		      (or buffers
			  (message "Composing main Info directory..."))
981
		      (set-buffer (generate-new-buffer " info dir"))
982 983 984
		      (condition-case nil
			  (progn
			    (insert-file-contents file)
985 986
			    (set (make-local-variable 'Info-dir-file-name)
				 file)
987
			    (push (current-buffer) buffers)
988
			    (push (cons file attrs) dir-file-attrs))
989
			(error (kill-buffer (current-buffer))))))))
990 991 992
	  (unless (cdr dirs)
	    (set (make-local-variable 'Info-dir-contents-directory)
		 (file-name-as-directory (car dirs))))
993
	  (setq dirs (cdr dirs))))
994

995
      (or buffers
996
	  (error "Can't find the Info directory node"))
997

998
      ;; Distinguish the dir file that comes with Emacs from all the
999
      ;; others.  Yes, that is really what this is supposed to do.
1000 1001 1002 1003
      ;; The definition of `Info-directory-list' puts it first on that
      ;; list and so last in `buffers' at this point.
      (setq buffer (car (last buffers))
	    others (delq buffer buffers))
1004

1005 1006 1007
      ;; Insert the entire original dir file as a start; note that we've
      ;; already saved its default directory to use as the default
      ;; directory for the whole concatenation.
1008
      (insert-buffer buffer)
1009

1010
      ;; Look at each of the other buffers one by one.
1011 1012
      (dolist (other others)
	(let (this-buffer-nodes)
1013
	  ;; In each, find all the menus.
1014
	  (with-current-buffer other
1015 1016 1017
	    (goto-char (point-min))
	    ;; Find each menu, and add an elt to NODES for it.
	    (while (re-search-forward "^\\* Menu:" nil t)
1018 1019 1020 1021
	      (while (and (zerop (forward-line 1)) (eolp)))
	      (let ((beg (point))
		    nodename end)
		(re-search-backward "^\^_")
1022
		(search-forward "Node: ")
Juri Linkov's avatar
Juri Linkov committed
1023
		(setq nodename (Info-following-node-name))
1024
		(search-forward "\n\^_" nil 'move)
1025 1026
		(beginning-of-line)
		(setq end (point))
1027
		(push (list nodename other beg end) this-buffer-nodes)))
1028
	    (if (assoc-string "top" this-buffer-nodes t)
1029 1030
		(setq nodes (nconc this-buffer-nodes nodes))
	      (setq problems t)
1031
	      (message "No `top' node in %s" Info-dir-file-name)))))
Dave Love's avatar
Dave Love committed
1032
      ;; Add to the main menu a menu item for each other node.
1033
      (re-search-forward "^\\* Menu:")
1034 1035
      (forward-line 1)
      (let ((menu-items '("top"))
1036
	    (end (save-excursion (search-forward "\^_" nil t) (point))))
1037 1038
	(dolist (node nodes)
	  (let ((nodename (car node)))
1039 1040
	    (save-excursion
	      (or (member (downcase nodename) menu-items)
1041
		  (re-search-forward (concat "^\\* +"
1042 1043 1044 1045 1046
					     (regexp-quote nodename)
					     "::")
				     end t)
		  (progn
		    (insert "* " nodename "::" "\n")
1047
		    (push nodename menu-items)))))))
1048