info.el 82.9 KB
Newer Older
1
;;; info.el --- info package for Emacs.
Eric S. Raymond's avatar
Eric S. Raymond committed
2

3
;; Copyright (C) 1985, 86, 92, 93, 94, 95, 96, 97, 98 Free Software
Karl Heuer's avatar
Karl Heuer committed
4
;; 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.
Eric S. Raymond's avatar
Eric S. Raymond committed
29 30 31

;;; Code:

32 33 34 35 36 37
(defgroup info nil
  "Info subsystem"
  :group 'help
  :group 'docs)


Jim Blandy's avatar
Jim Blandy committed
38 39 40 41
(defvar Info-history nil
  "List of info nodes user has visited.
Each element of list is a list (FILENAME NODENAME BUFFERPOS).")

42
(defcustom Info-enable-edit nil
43
  "*Non-nil means the \\<Info-mode-map>\\[Info-edit] command in Info can edit the current node.
44 45 46
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,
47 48 49
because that gives you a printed manual as well."
  :type 'boolean
  :group 'info)
Jim Blandy's avatar
Jim Blandy committed
50

51
(defvar Info-enable-active-nodes nil
Jim Blandy's avatar
Jim Blandy committed
52 53
  "Non-nil allows Info to execute Lisp code associated with nodes.
The Lisp code is executed when the node is selected.")
54
(put 'Info-enable-active-nodes 'risky-local-variable t)
Jim Blandy's avatar
Jim Blandy committed
55

56 57 58 59
(defcustom Info-fontify t
  "*Non-nil enables highlighting and fonts in Info nodes."
  :type 'boolean
  :group 'info)
60

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
(defface info-node
  '((t (:bold t :italic t)))
  "Face for Info node names."
  :group 'info)

(defface info-menu-5
  '((t (:underline t)))
  "Face for the fifth and tenth `*' in an Info menu."
  :group 'info)

(defface info-xref
  '((t (:bold t)))
  "Face for Info cross-references."
  :group 'info)

76 77 78 79
(defcustom Info-fontify-maximum-menu-size 30000
  "*Maximum size of menu to fontify if `Info-fontify' is non-nil."
  :type 'integer
  :group 'info)
80

81
(defvar Info-directory-list
82
  (let ((path (getenv "INFOPATH"))
83 84 85 86
	;; This is for older Emacs versions
	;; which might get this info.el from the Texinfo distribution.
	(path-separator (if (boundp 'path-separator) path-separator
			  (if (eq system-type 'ms-dos) ";" ":")))
87
	(source (expand-file-name "info/" source-directory))
88
	(sibling (if installation-directory
89 90
		     (expand-file-name "info/" installation-directory)))
	alternative)
91 92 93 94
    (if path
	(let ((list nil)
	      idx)
	  (while (> (length path) 0)
95
	    (setq idx (or (string-match path-separator path) (length path))
96 97 98 99
		  list (cons (substring path 0 idx) list)
		  path (substring path (min (1+ idx)
					    (length path)))))
	  (nreverse list))
100 101 102 103 104
      (if (and sibling (file-exists-p sibling))
	  (setq alternative sibling)
	(setq alternative source))
      (if (or (member alternative Info-default-directory-list)
	      (not (file-exists-p alternative))
105
	      ;; On DOS/NT, we use movable executables always,
106
	      ;; and we must always find the Info dir at run time.
107
	      (if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
108 109 110 111
		  nil
		;; Use invocation-directory for Info only if we used it for
		;; exec-directory also.
		(not (string= exec-directory
112 113
			      (expand-file-name "lib-src/"
						installation-directory)))))
114
	  Info-default-directory-list
115 116
	(reverse (cons alternative
		       (cdr (reverse Info-default-directory-list)))))))
Jim Blandy's avatar
Jim Blandy committed
117
  "List of directories to search for Info documentation files.
Jim Blandy's avatar
Jim Blandy committed
118
nil means not yet initialized.  In this case, Info uses the environment
119
variable INFOPATH to initialize it, or `Info-default-directory-list'
120 121
if there is no INFOPATH variable in the environment.
The last element of `Info-default-directory-list' is the directory
122
where Emacs installs the Info files that come with it.
123 124 125 126 127

If you run the Emacs executable from the `src' directory in the Emacs
source tree, the `info' directory in the source tree is used as the last
element, 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
128

129
(defcustom Info-additional-directory-list nil
130
  "List of additional directories to search for Info documentation files.
131 132 133
These directories are not searched for merging the `dir' file."
  :type '(repeat directory)
  :group 'info)
134

Jim Blandy's avatar
Jim Blandy committed
135
(defvar Info-current-file nil
136 137 138
  "Info file that Info is now looking at, or nil.
This is the name that was specified in Info, not the actual file name.
It doesn't contain directory names or file name extensions added by Info.")
Jim Blandy's avatar
Jim Blandy committed
139 140 141 142 143 144 145 146

(defvar Info-current-subfile nil
  "Info subfile that is actually in the *info* buffer now,
or nil if current info file is not split into subfiles.")

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

147
(defvar Info-tag-table-marker nil
Jim Blandy's avatar
Jim Blandy committed
148 149 150
  "Marker pointing at beginning of current Info file's tag table.
Marker points nowhere if file has no tag table.")

151 152 153
(defvar Info-tag-table-buffer nil
  "Buffer used for indirect tag tables.")

154 155 156
(defvar Info-current-file-completions nil
  "Cached completion list for current Info file.")

157 158 159
(defvar Info-index-alternatives nil
  "List of possible matches for last Info-index command.")

160 161 162
(defvar Info-standalone nil
  "Non-nil if Emacs was started solely as an Info browser.")

163
(defvar Info-suffix-list
164 165
  ;; The MS-DOS list should work both when long file names are
  ;; supported (Windows 9X), and when only 8+3 file names are available.
166 167 168
  (if (eq system-type 'ms-dos)
      '( (".gz"      . "gunzip")
	 (".z"       . "gunzip")
169 170 171 172 173 174 175 176
	 (".inz"     . "gunzip")
	 (".igz"     . "gunzip")
	 (".info.Z"  . "gunzip")
	 (".info.gz" . "gunzip")
	 ("-info.Z"  . "gunzip")
	 ("-info.gz" . "gunzip")
	 ("/index.gz". "gunzip")
	 ("/index.z" . "gunzip")
177
	 (".inf"     . nil)
178 179 180
	 (".info"    . nil)
	 ("-info"    . nil)
	 ("/index"   . nil)
181
	 (""         . nil))
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
    '( (".info.Z".    "uncompress")
       (".info.Y".    "unyabba")
       (".info.gz".   "gunzip")
       (".info.z".    "gunzip")
       (".info".      nil)
       ("-info.Z".   "uncompress")
       ("-info.Y".   "unyabba")
       ("-info.gz".  "gunzip")
       ("-info.z".   "gunzip")
       ("-info".     nil)
       ("/index.Z".   "uncompress")
       ("/index.Y".   "unyabba")
       ("/index.gz".  "gunzip")
       ("/index.z".   "gunzip")
       ("/index".     nil)
       (".Z".         "uncompress")
       (".Y".         "unyabba")
       (".gz".        "gunzip")
       (".z".         "gunzip")
       ("".           nil)))
202 203
  "List of file name suffixes and associated decoding commands.
Each entry should be (SUFFIX . STRING); the file is given to
204 205 206
the command as standard input.  If STRING is nil, no decoding is done.
Because the SUFFIXes are tried in order, the empty string should
be last in the list.")
207

208
;; Concatenate SUFFIX onto FILENAME.  SUFFIX should start with a dot.
209 210 211 212 213 214
;; First, on ms-dos, delete some of the extension in FILENAME
;; to make room.
(defun info-insert-file-contents-1 (filename suffix)
  (if (not (eq system-type 'ms-dos))
      (concat filename suffix)
    (let* ((sans-exts (file-name-sans-extension filename))
215 216 217
	   ;; How long is the extension in FILENAME (not counting the dot).
	   (ext-len (max 0 (- (length filename) (length sans-exts) 1)))
	   ext-left)
218
      ;; SUFFIX starts with a dot.  If FILENAME already has one,
219
      ;; get rid of the one in SUFFIX (unless suffix is empty).
220
      (or (and (<= ext-len 0)
221
	       (not (eq (aref filename (1- (length filename))) ?.)))
222
	  (= (length suffix) 0)
223
	  (setq suffix (substring suffix 1)))
224 225
      ;; How many chars of that extension should we keep?
      (setq ext-left (min ext-len (max 0 (- 3 (length suffix)))))
226 227 228 229 230
      ;; Get rid of the rest of the extension, and add SUFFIX.
      (concat (substring filename 0 (- (length filename)
				       (- ext-len ext-left)))
	      suffix))))

231 232 233 234
(defun info-file-exists-p (filename)
  (and (file-exists-p filename)
       (not (file-directory-p filename))))

235 236 237
(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."
238 239 240
  (let ((tail Info-suffix-list)
	fullname decoder)
    (if (file-exists-p filename)
241 242
	;; FILENAME exists--see if that name contains a suffix.
	;; If so, set DECODE accordingly.
243 244 245 246 247 248 249 250
	(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))))
251
      ;; Try adding suffixes to FILENAME and see if we can find something.
252
      (while (and tail
253 254
		  (not (info-file-exists-p (info-insert-file-contents-1
					    filename (car (car tail))))))
255
	(setq tail (cdr tail)))
256 257
      ;; If we found a file with a suffix, set DECODER according to the suffix
      ;; and set FULLNAME to the file's actual name.
258
      (setq fullname (info-insert-file-contents-1 filename (car (car tail)))
259 260
	    decoder (cdr (car tail)))
      (or tail
261
	  (error "Can't find %s or any compressed version of it" filename)))
262 263 264 265 266
    ;; check for conflict with jka-compr
    (if (and (featurep 'jka-compr)
	     (jka-compr-installed-p)
	     (jka-compr-get-compression-info fullname))
	(setq decoder nil))
267
    (if decoder
268 269 270 271 272 273 274 275
	(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)))
	    (call-process-region (point-min) (point-max) decoder t t)))
      (insert-file-contents fullname visit))))
276

277 278 279 280 281 282 283 284
;;;###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))))
  (let (same-window-buffer-names)
    (info file)))
  
285
;;;###autoload (add-hook 'same-window-buffer-names "*info*")
286

Jim Blandy's avatar
Jim Blandy committed
287 288 289 290 291 292 293
;;;###autoload
(defun info (&optional file)
  "Enter Info, the documentation browser.
Optional argument FILE specifies the file to examine;
the default is the top-level directory of Info.

In interactive use, a prefix argument directs this command
Richard M. Stallman's avatar
Richard M. Stallman committed
294 295 296 297 298
to read a file name from the minibuffer.

The search path for Info files is in the variable `Info-directory-list'.
The top-level Info directory is made by combining all the files named `dir' 
in all the directories in that path."
Jim Blandy's avatar
Jim Blandy committed
299 300 301
  (interactive (if current-prefix-arg
		   (list (read-file-name "Info file name: " nil nil t))))
  (if file
302 303 304 305 306
      (progn (pop-to-buffer "*info*")
	     (Info-goto-node (concat "(" file ")")))
    (if (get-buffer "*info*")
	(pop-to-buffer "*info*")
      (Info-directory))))
Jim Blandy's avatar
Jim Blandy committed
307

308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
;;;###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)))

Jim Blandy's avatar
Jim Blandy committed
326 327 328 329 330 331 332 333
;; 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.
(defun Info-find-node (filename nodename &optional no-going-back)
  ;; Convert filename to lower case if not found as specified.
  ;; Expand it.
  (if filename
      (let (temp temp-downcase found)
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
        (setq filename (substitute-in-file-name filename))
        (if (string= (downcase filename) "dir")
            (setq found t)
          (let ((dirs (if (string-match "^\\./" filename)
                          ;; 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.
              (let ((suffix-list Info-suffix-list))
                (while (and suffix-list (not found))
                  (cond ((info-file-exists-p
                          (info-insert-file-contents-1
                           temp (car (car suffix-list))))
                         (setq found temp))
                        ((info-file-exists-p
                          (info-insert-file-contents-1
                           temp-downcase (car (car suffix-list))))
                         (setq found temp-downcase)))
                  (setq suffix-list (cdr suffix-list))))
              (setq dirs (cdr dirs)))))
        (if found
            (setq filename found)
          (error "Info file %s does not exist" filename))))
  ;; 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
375
  ;; Go into info buffer.
376
  (or (eq major-mode 'Info-mode) (pop-to-buffer "*info*"))
377
  (buffer-disable-undo (current-buffer))
Jim Blandy's avatar
Jim Blandy committed
378 379 380 381 382 383
  (or (eq major-mode 'Info-mode)
      (Info-mode))
  (widen)
  (setq Info-current-node nil)
  (unwind-protect
      (progn
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
        ;; 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)
              (if (eq filename t)
                  (Info-insert-dir)
                (info-insert-file-contents filename t)
                (setq default-directory (file-name-directory filename)))
              (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)
422
                            (buffer-disable-undo (current-buffer))
423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508
                            (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
                    (if (eq filename t) "dir" filename))))
        ;; 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.
          (let ((guesspos (point-min))
                (regexp
                 (concat "\\(Node:\\|Ref:\\) *"
                         (regexp-quote nodename)
                         " *[,\t\n\177]")))

            ;; First, search a tag table, if any
            (if (marker-position Info-tag-table-marker)

                (let (found-in-tag-table
                      found-mode
                      (m Info-tag-table-marker))
                  (save-excursion
                    (set-buffer (marker-buffer m))
                    (goto-char m)
                    (beginning-of-line) ; so re-search will work.

                    ;; Search tag table
                    (setq found-in-tag-table
                          (re-search-forward regexp nil t))
                    (if found-in-tag-table
                        (setq guesspos (read (current-buffer))))
                    (setq found-mode major-mode))

                  ;; Indirect file among split files
                  (if found-in-tag-table
                      (progn
                        ;; If this is an indirect file, determine
                        ;; which file really holds this node and
                        ;; read it in.
                        (if (not (eq found-mode '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)))))

                  ;; Handle anchor
                  (if (and found-in-tag-table
                           (string-equal "Ref:" (match-string 1)))
                      (goto-char guesspos)

                    ;; Else we may have a node, which we search for:
                    (goto-char (max (point-min) (- guesspos 1000)))
                    ;; Now search from our advised position
                    ;; (or from beg of buffer)
                    ;; to find the actual node.
                    (catch 'foo
                      (while (search-forward "\n\^_" nil t)
                        (forward-line 1)
                        (let ((beg (point)))
                          (forward-line 1)
                          (if (re-search-backward regexp beg t)
                              (progn
                                (beginning-of-line)
                                (throw 'foo t)))))
                      (error
                       "No such anchor in tag table or node in tag table or file: %s"
                       nodename))))))

          (Info-select-node)))
Jim Blandy's avatar
Jim Blandy committed
509 510
    ;; If we did not finish finding the specified node,
    ;; go back to the previous one.
511
    (or Info-current-node no-going-back (null Info-history)
512 513 514 515
        (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
516

517 518
;; Cache the contents of the (virtual) dir file, once we have merged
;; it for the first time, so we can save time subsequently.
519 520
(defvar Info-dir-contents nil)

521 522 523 524
;; Cache for the directory we decided to use for the default-directory
;; of the merged dir text.
(defvar Info-dir-contents-directory nil)

525 526 527 528
;; Record the file attributes of all the files from which we
;; constructed Info-dir-contents.
(defvar Info-dir-file-attributes nil)

529
;; Construct the Info directory node by merging the files named `dir'
530 531 532
;; from various directories.  Set the *info* buffer's
;; default-directory to the first directory we actually get any text
;; from.
533
(defun Info-insert-dir ()
534 535 536 537 538
  (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
		       (mapcar '(lambda (elt)
539 540 541 542 543
				  (let ((curr (file-attributes (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)))
544
			       Info-dir-file-attributes))))
545 546
      (insert Info-dir-contents)
    (let ((dirs Info-directory-list)
547
	  buffers buffer others nodes dirs-done)
548

549 550
      (setq Info-dir-file-attributes nil)

551
      ;; Search the directory list for the directory file.
552
      (while dirs
553 554 555 556 557
	(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.
558 559 560 561 562 563 564 565 566 567 568
	      (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)))))
569 570 571 572
		(setq dirs-done
		      (cons truename
			    (cons (directory-file-name truename)
				  dirs-done)))
573 574 575 576
		(if attrs
		    (save-excursion
		      (or buffers
			  (message "Composing main Info directory..."))
577
		      (set-buffer (generate-new-buffer " info dir"))
578 579 580 581 582
		      (insert-file-contents file)
		      (setq buffers (cons (current-buffer) buffers)
			    Info-dir-file-attributes
			    (cons (cons file attrs)
				  Info-dir-file-attributes))))))
583 584
	  (or (cdr dirs) (setq Info-dir-contents-directory
			       (file-name-as-directory (car dirs))))
585 586
	  (setq dirs (cdr dirs))))
      
587
      (or buffers
588
	  (error "Can't find the Info directory node"))
589
      ;; Distinguish the dir file that comes with Emacs from all the
590 591
      ;; others.  Yes, that is really what this is supposed to do.
      ;; If it doesn't work, fix it.
592 593
      (setq buffer (car buffers)
	    others (cdr buffers))
594

595 596 597
      ;; 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.
598
      (insert-buffer buffer)
599

600 601 602 603 604 605 606 607 608 609 610 611
      ;; Look at each of the other buffers one by one.
      (while others
	(let ((other (car others)))
	  ;; In each, find all the menus.
	  (save-excursion
	    (set-buffer other)
	    (goto-char (point-min))
	    ;; Find each menu, and add an elt to NODES for it.
	    (while (re-search-forward "^\\* Menu:" nil t)
	      (let (beg nodename end)
		(forward-line 1)
		(setq beg (point))
612
		(search-backward "\n\^_")
613 614
		(search-forward "Node: ")
		(setq nodename (Info-following-node-name))
615
		(search-forward "\n\^_" nil 'move)
616 617 618 619 620 621 622 623 624 625
		(beginning-of-line)
		(setq end (point))
		(setq nodes (cons (list nodename other beg end) nodes))))))
	(setq others (cdr others)))
      ;; Add to the main menu a menu item for each other node.
      (re-search-forward "^\\* Menu:")
      (forward-line 1)
      (let ((menu-items '("top"))
	    (nodes nodes)
	    (case-fold-search t)
626
	    (end (save-excursion (search-forward "\^_" nil t) (point))))
627 628
	(while nodes
	  (let ((nodename (car (car nodes))))
629 630
	    (save-excursion
	      (or (member (downcase nodename) menu-items)
631
		  (re-search-forward (concat "^\\* +"
632 633 634 635 636 637
					     (regexp-quote nodename)
					     "::")
				     end t)
		  (progn
		    (insert "* " nodename "::" "\n")
		    (setq menu-items (cons nodename menu-items))))))
638 639 640 641 642 643 644
	  (setq nodes (cdr nodes))))
      ;; Now take each node of each of the other buffers
      ;; and merge it into the main buffer.
      (while nodes
	(let ((nodename (car (car nodes))))
	  (goto-char (point-min))
	  ;; Find the like-named node in the main buffer.
645
	  (if (re-search-forward (concat "\n\^_.*\n.*Node: "
646 647 648 649
					 (regexp-quote nodename)
					 "[,\n\t]")
				 nil t)
	      (progn
650
		(search-forward "\n\^_" nil 'move)
651 652
		(beginning-of-line)
		(insert "\n"))
653 654
	    ;; If none exists, add one.
	    (goto-char (point-max))
655
	    (insert "\^_\nFile: dir\tNode: " nodename "\n\n* Menu:\n\n"))
656 657
	  ;; Merge the text from the other buffer's menu
	  ;; into the menu in the like-named node in the main buffer.
658
	  (apply 'insert-buffer-substring (cdr (car nodes))))
659 660 661 662
	(setq nodes (cdr nodes)))
      ;; Kill all the buffers we just made.
      (while buffers
	(kill-buffer (car buffers))
663 664
	(setq buffers (cdr buffers)))
      (message "Composing main Info directory...done"))
665 666
    (setq Info-dir-contents (buffer-string)))
  (setq default-directory Info-dir-contents-directory))
667

668 669
;; Note that on entry to this function the current-buffer must be the
;; *info* buffer; not the info tags buffer.
Jim Blandy's avatar
Jim Blandy committed
670
(defun Info-read-subfile (nodepos)
671 672
  ;; NODEPOS is either a position (in the Info file as a whole,
  ;; not relative to a subfile) or the name of a subfile.
Jim Blandy's avatar
Jim Blandy committed
673 674
  (let (lastfilepos
	lastfilename)
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
    (if (numberp nodepos)
	(save-excursion
	  (set-buffer (marker-buffer Info-tag-table-marker))
	  (goto-char (point-min))
	  (search-forward "\n\^_")
	  (forward-line 2)
	  (catch 'foo
	    (while (not (looking-at "\^_"))
	      (if (not (eolp))
		  (let ((beg (point))
			thisfilepos thisfilename)
		    (search-forward ": ")
		    (setq thisfilename  (buffer-substring beg (- (point) 2)))
		    (setq thisfilepos (read (current-buffer)))
		    ;; read in version 19 stops at the end of number.
		    ;; Advance to the next line.
		    (forward-line 1)
		    (if (> thisfilepos nodepos)
			(throw 'foo t))
		    (setq lastfilename thisfilename)
		    (setq lastfilepos thisfilepos))
		(forward-line 1)))))
      (setq lastfilename nodepos)
      (setq lastfilepos 0))
699 700
    ;; Assume previous buffer is in Info-mode.
    ;; (set-buffer (get-buffer "*info*"))
Jim Blandy's avatar
Jim Blandy committed
701 702 703 704 705
    (or (equal Info-current-subfile lastfilename)
	(let ((buffer-read-only nil))
	  (setq buffer-file-name nil)
	  (widen)
	  (erase-buffer)
706
	  (info-insert-file-contents lastfilename)
Jim Blandy's avatar
Jim Blandy committed
707 708 709 710
	  (set-buffer-modified-p nil)
	  (setq Info-current-subfile lastfilename)))
    (goto-char (point-min))
    (search-forward "\n\^_")
711 712
    (if (numberp nodepos)
	(+ (- nodepos lastfilepos) (point)))))
Jim Blandy's avatar
Jim Blandy committed
713 714 715 716 717 718 719 720 721 722

;; Select the info node that point is in.
(defun Info-select-node ()
  (save-excursion
   ;; Find beginning of node.
   (search-backward "\n\^_")
   (forward-line 2)
   ;; Get nodename spelled as it is in the node.
   (re-search-forward "Node:[ \t]*")
   (setq Info-current-node
723 724 725 726
	 (buffer-substring-no-properties (point)
					 (progn
					  (skip-chars-forward "^,\t\n")
					  (point))))
Jim Blandy's avatar
Jim Blandy committed
727 728 729 730 731 732 733 734 735 736 737 738 739 740
   (Info-set-mode-line)
   ;; Find the end of it, and narrow.
   (beginning-of-line)
   (let (active-expression)
     (narrow-to-region (point)
		       (if (re-search-forward "\n[\^_\f]" nil t)
			   (prog1
			    (1- (point))
			    (if (looking-at "[\n\^_\f]*execute: ")
				(progn
				  (goto-char (match-end 0))
				  (setq active-expression
					(read (current-buffer))))))
			 (point-max)))
741
     (if Info-enable-active-nodes (eval active-expression))
742
     (if Info-fontify (Info-fontify-node))
743
     (run-hooks 'Info-selection-hook))))
Jim Blandy's avatar
Jim Blandy committed
744 745 746 747

(defun Info-set-mode-line ()
  (setq mode-line-buffer-identification
	(concat
748
	 "  Info:  ("
Jim Blandy's avatar
Jim Blandy committed
749 750 751 752 753 754 755 756 757 758 759
	 (if Info-current-file
	     (file-name-nondirectory Info-current-file)
	   "")
	 ")"
	 (or Info-current-node ""))))

;; Go to an info node specified with a filename-and-nodename string
;; of the sort that is found in pointers in nodes.

(defun Info-goto-node (nodename)
  "Go to info node named NAME.  Give just NODENAME or (FILENAME)NODENAME."
760
  (interactive (list (Info-read-node-name "Goto node: ")))
Jim Blandy's avatar
Jim Blandy committed
761 762 763 764 765 766 767 768 769 770 771
  (let (filename)
    (string-match "\\s *\\((\\s *\\([^\t)]*\\)\\s *)\\s *\\|\\)\\(.*\\)"
		  nodename)
    (setq filename (if (= (match-beginning 1) (match-end 1))
		       ""
		     (substring nodename (match-beginning 2) (match-end 2)))
	  nodename (substring nodename (match-beginning 3) (match-end 3)))
    (let ((trim (string-match "\\s *\\'" filename)))
      (if trim (setq filename (substring filename 0 trim))))
    (let ((trim (string-match "\\s *\\'" nodename)))
      (if trim (setq nodename (substring nodename 0 trim))))
772
    (if transient-mark-mode (deactivate-mark))
Jim Blandy's avatar
Jim Blandy committed
773 774
    (Info-find-node (if (equal filename "") nil filename)
		    (if (equal nodename "") "Top" nodename))))
775

776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
;; This function is used as the "completion table" while reading a node name.
;; It does completion using the alist in completion-table
;; unless STRING starts with an open-paren.
(defun Info-read-node-name-1 (string predicate code)
  (let ((no-completion (and (> (length string) 0) (eq (aref string 0) ?\())))
    (cond ((eq code nil)
	   (if no-completion
	       string
	     (try-completion string completion-table predicate)))
	  ((eq code t)
	   (if no-completion
	       nil
	     (all-completions string completion-table predicate)))
	  ((eq code 'lambda)
	   (if no-completion
	       t
	     (assoc string completion-table))))))

794 795
(defun Info-read-node-name (prompt &optional default)
  (let* ((completion-ignore-case t)
796
	 (completion-table (Info-build-node-completions))
797
	 (nodename (completing-read prompt 'Info-read-node-name-1 nil t)))
798 799 800 801 802 803 804 805 806 807 808
    (if (equal nodename "")
	(or default
	    (Info-read-node-name prompt))
      nodename)))

(defun Info-build-node-completions ()
  (or Info-current-file-completions
      (let ((compl nil))
	(save-excursion
	  (save-restriction
	    (if (marker-buffer Info-tag-table-marker)
809 810
		(let ((marker Info-tag-table-marker))
		  (set-buffer (marker-buffer marker))
811
		  (widen)
812
		  (goto-char marker)
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
		  (while (re-search-forward "\nNode: \\(.*\\)\177" nil t)
		    (setq compl
			  (cons (list (buffer-substring (match-beginning 1)
							(match-end 1)))
				compl))))
	      (widen)
	      (goto-char (point-min))
	      (while (search-forward "\n\^_" nil t)
		(forward-line 1)
		(let ((beg (point)))
		  (forward-line 1)
		  (if (re-search-backward "Node: *\\([^,\n]*\\) *[,\n\t]"
					  beg t)
		      (setq compl 
			    (cons (list (buffer-substring (match-beginning 1)
							  (match-end 1)))
				  compl))))))))
	(setq Info-current-file-completions compl))))
Jim Blandy's avatar
Jim Blandy committed
831

Jim Blandy's avatar
Jim Blandy committed
832 833
(defun Info-restore-point (hl)
  "If this node has been visited, restore the point value when we left."
834 835
  (while hl
    (if (and (equal (nth 0 (car hl)) Info-current-file)
836 837
	     ;; Use string-equal, not equal, to ignore text props.
	     (string-equal (nth 1 (car hl)) Info-current-node))
838
	(progn
839 840
	  (goto-char (nth 2 (car hl)))
	  (setq hl nil))		;terminate the while at next iter
841
      (setq hl (cdr hl)))))
Jim Blandy's avatar
Jim Blandy committed
842

Jim Blandy's avatar
Jim Blandy committed
843
(defvar Info-last-search nil
844
  "Default regexp for \\<Info-mode-map>\\[Info-search] command to search for.")
Jim Blandy's avatar
Jim Blandy committed
845 846 847 848

(defun Info-search (regexp)
  "Search for REGEXP, starting from point, and select node it's found in."
  (interactive "sSearch (regexp): ")
849
  (if transient-mark-mode (deactivate-mark))
Jim Blandy's avatar
Jim Blandy committed
850 851 852 853 854 855 856
  (if (equal regexp "")
      (setq regexp Info-last-search)
    (setq Info-last-search regexp))
  (let ((found ()) current
	(onode Info-current-node)
	(ofile Info-current-file)
	(opoint (point))
857
	(ostart (window-start))
Jim Blandy's avatar
Jim Blandy committed
858 859 860 861 862 863 864 865 866 867 868 869
	(osubfile Info-current-subfile))
    (save-excursion
      (save-restriction
	(widen)
	(if (null Info-current-subfile)
	    (progn (re-search-forward regexp) (setq found (point)))
	  (condition-case err
	      (progn (re-search-forward regexp) (setq found (point)))
	    (search-failed nil)))))
    (if (not found) ;can only happen in subfile case -- else would have erred
	(unwind-protect
	    (let ((list ()))
870 871
	      (save-excursion
		(set-buffer (marker-buffer Info-tag-table-marker))
Jim Blandy's avatar
Jim Blandy committed
872
		(goto-char (point-min))
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
		(search-forward "\n\^_\nIndirect:")
		(save-restriction
		  (narrow-to-region (point)
				    (progn (search-forward "\n\^_")
					   (1- (point))))
		  (goto-char (point-min))
		  (search-forward (concat "\n" osubfile ": "))
		  (beginning-of-line)
		  (while (not (eobp))
		    (re-search-forward "\\(^.*\\): [0-9]+$")
		    (goto-char (+ (match-end 1) 2))
		    (setq list (cons (cons (read (current-buffer))
					   (buffer-substring
					    (match-beginning 1) (match-end 1)))
				     list))
		    (goto-char (1+ (match-end 0))))
		  (setq list (nreverse list)
			current (car (car list))
			list (cdr list))))
Jim Blandy's avatar
Jim Blandy committed
892 893 894 895
	      (while list
		(message "Searching subfile %s..." (cdr (car list)))
		(Info-read-subfile (car (car list)))
		(setq list (cdr list))
896
;;		(goto-char (point-min))
Jim Blandy's avatar
Jim Blandy committed
897 898 899 900 901 902
		(if (re-search-forward regexp nil t)
		    (setq found (point) list ())))
	      (if found
		  (message "")
		(signal 'search-failed (list regexp))))
	  (if (not found)
903
	      (progn (Info-read-subfile osubfile)
Jim Blandy's avatar
Jim Blandy committed
904
		     (goto-char opoint)
905 906
		     (Info-select-node)
		     (set-window-start (selected-window) ostart)))))
Jim Blandy's avatar
Jim Blandy committed
907 908 909
    (widen)
    (goto-char found)
    (Info-select-node)
910 911
    ;; Use string-equal, not equal, to ignore text props.
    (or (and (string-equal onode Info-current-node)
Jim Blandy's avatar
Jim Blandy committed
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
	     (equal ofile Info-current-file))
	(setq Info-history (cons (list ofile onode opoint)
				 Info-history)))))

;; Extract the value of the node-pointer named NAME.
;; If there is none, use ERRORNAME in the error message; 
;; if ERRORNAME is nil, just return nil.
(defun Info-extract-pointer (name &optional errorname)
  (save-excursion
   (goto-char (point-min))
   (forward-line 1)
   (if (re-search-backward (concat name ":") nil t)
       (progn
	 (goto-char (match-end 0))
	 (Info-following-node-name))
     (if (eq errorname t)
	 nil
929
       (error "Node has no %s" (capitalize (or errorname name)))))))
Jim Blandy's avatar
Jim Blandy committed
930

931 932
;; Return the node name in the buffer following point.
;; ALLOWEDCHARS, if non-nil, goes within [...] to make a regexp
933
;; saying which chars may appear in the node name.
Jim Blandy's avatar
Jim Blandy committed
934 935
(defun Info-following-node-name (&optional allowedchars)
  (skip-chars-forward " \t")
936
  (buffer-substring-no-properties
Jim Blandy's avatar
Jim Blandy committed
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
   (point)
   (progn
     (while (looking-at (concat "[" (or allowedchars "^,\t\n") "]"))
       (skip-chars-forward (concat (or allowedchars "^,\t\n") "("))
       (if (looking-at "(")
	   (skip-chars-forward "^)")))
     (skip-chars-backward " ")
     (point))))

(defun Info-next ()
  "Go to the next node of this node."
  (interactive)
  (Info-goto-node (Info-extract-pointer "next")))

(defun Info-prev ()
  "Go to the previous node of this node."
  (interactive)
  (Info-goto-node (Info-extract-pointer "prev[ious]*" "previous")))

956 957 958
(defun Info-up (&optional same-file)
  "Go to the superior node of this node.
If SAME-FILE is non-nil, do not move to a different Info file."
Jim Blandy's avatar
Jim Blandy committed
959
  (interactive)
960 961 962 963 964
  (let ((node (Info-extract-pointer "up")))
    (and same-file
	 (string-match "^(" node)
	 (error "Up node is in another Info file"))
    (Info-goto-node node))
Jim Blandy's avatar
Jim Blandy committed
965
  (Info-restore-point Info-history))
Jim Blandy's avatar
Jim Blandy committed
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990

(defun Info-last ()
  "Go back to the last node visited."
  (interactive)
  (or Info-history
      (error "This is the first Info node you looked at"))
  (let (filename nodename opoint)
    (setq filename (car (car Info-history)))
    (setq nodename (car (cdr (car Info-history))))
    (setq opoint (car (cdr (cdr (car Info-history)))))
    (setq Info-history (cdr Info-history))
    (Info-find-node filename nodename)
    (setq Info-history (cdr Info-history))
    (goto-char opoint)))

(defun Info-directory ()
  "Go to the Info directory node."
  (interactive)
  (Info-find-node "dir" "top"))

(defun Info-follow-reference (footnotename)
  "Follow cross reference named NAME to the node it refers to.
NAME may be an abbreviation of the reference name."
  (interactive
   (let ((completion-ignore-case t)
991
	 completions default alt-default (start-point (point)) str i bol eol)
Jim Blandy's avatar
Jim Blandy committed
992
     (save-excursion
993 994 995 996 997 998
       ;; Store end and beginning of line.
       (end-of-line)
       (setq eol (point))
       (beginning-of-line)
       (setq bol (point))

Jim Blandy's avatar
Jim Blandy committed
999 1000 1001 1002 1003 1004 1005
       (goto-char (point-min))
       (while (re-search-forward "\\*note[ \n\t]*\\([^:]*\\):" nil t)
	 (setq str (buffer-substring
		    (match-beginning 1)
		    (1- (point))))
	 ;; See if this one should be the default.
	 (and (null default)
1006
	      (<= (match-beginning 0) start-point)
Jim Blandy's avatar
Jim Blandy committed
1007 1008
	      (<= start-point (point))
	      (setq default t))
1009 1010 1011 1012 1013
	 ;; See if this one should be the alternate default.
	 (and (null alt-default)
	      (and (<= bol (match-beginning 0))
		   (<= (point) eol))
	      (setq alt-default t))
Jim Blandy's avatar
Jim Blandy committed
1014 1015 1016 1017 1018 1019 1020
	 (setq i 0)
	 (while (setq i (string-match "[ \n\t]+" str i))
	   (setq str (concat (substring str 0 i) " "
			     (substring str (match-end 0))))
	   (setq i (1+ i)))
	 ;; Record as a completion and perhaps as default.
	 (if (eq default t) (setq default str))
1021
	 (if (eq alt-default t) (setq alt-default str))
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	 ;; Don't add this string if it's a duplicate.
	 ;; We use a loop instead of "(assoc str completions)" because
	 ;; we want to do a case-insensitive compare.
	 (let ((tail completions)
	       (tem (downcase str)))
	   (while (and tail
		       (not (string-equal tem (downcase (car (car tail))))))
	     (setq tail (cdr tail)))
	   (or tail
	       (setq completions
		     (cons (cons str nil)
			   completions))))))
1034 1035 1036 1037 1038 1039
     ;; If no good default was found, try an alternate.
     (or default
	 (setq default alt-default))
     ;; If only one cross-reference found, then make it default.
     (if (eq (length completions) 1)
         (setq default (car (car completions))))
Jim Blandy's avatar
Jim Blandy committed
1040
     (if completions
1041 1042 1043 1044 1045 1046 1047
	 (let ((input (completing-read (if default
					   (concat "Follow reference named: ("
						   default ") ")
					 "Follow reference named: ")
				       completions nil t)))
	   (list (if (equal input "")
		     default input)))
Jim Blandy's avatar
Jim Blandy committed
1048
       (error "No cross-references in this node"))))
1049
  (let (target beg i (str (concat "\\*note " (regexp-quote footnotename))))
Jim Blandy's avatar
Jim Blandy committed
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
    (while (setq i (string-match " " str i))
      (setq str (concat (substring str 0 i) "[ \t\n]+" (substring str (1+ i))))
      (setq i (+ i 6)))
    (save-excursion
      (goto-char (point-min))
      (or (re-search-forward str nil t)
	  (error "No cross-reference named %s" footnotename))
      (goto-char (+ (match-beginning 0) 5))
      (setq target
	    (Info-extract-menu-node-name "Bad format cross reference" t)))
    (while (setq i (string-match "[ \t\n]+" target i))
      (setq target (concat (substring target 0 i) " "
			   (substring target (match-end 0))))
      (setq i (+ i 1)))
    (Info-goto-node target)))

(defun Info-extract-menu-node-name (&optional errmessage multi-line)
  (skip-chars-forward " \t\n")
  (let ((beg (point))
	str i)
    (skip-chars-forward "^:")
    (forward-char 1)
    (setq str
	  (if (looking-at ":")
1074
	      (buffer-substring-no-properties beg (1- (point)))
Jim Blandy's avatar
Jim Blandy committed
1075 1076 1077 1078
	    (skip-chars-forward " \t\n")
	    (Info-following-node-name (if multi-line "^.,\t" "^.,\t\n"))))
    (while (setq i (string-match "\n" str i))
      (aset str i ?\ ))
1079 1080 1081
    ;; Collapse multiple spaces.
    (while (string-match "  +" str)
      (setq str (replace-match " " t t str)))
Jim Blandy's avatar
Jim Blandy committed
1082 1083
    str))

1084
;; No one calls this.
1085 1086
;;(defun Info-menu-item-sequence (list)
;;  (while list
1087
;;    (Info-menu (car list))
1088
;;    (setq list (cdr list))))
Jim Blandy's avatar
Jim Blandy committed
1089

1090 1091 1092 1093
(defun Info-complete-menu-item (string predicate action)
  (let ((case-fold-search t))
    (cond ((eq action nil)
	   (let (completions
1094
		 (pattern (concat "\n\\* +\\("
1095 1096 1097 1098 1099
				  (regexp-quote string)
				  "[^:\t\n]*\\):")))
	     (save-excursion
	       (set-buffer Info-complete-menu-buffer)
	       (goto-char (point-min))
1100
	       (search-forward "\n* Menu:")
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	       (while (re-search-forward pattern nil t)
		 (setq completions (cons (cons (format "%s"
						       (buffer-substring
							(match-beginning 1)
							(match-end 1)))
					       (match-beginning 1))
					 completions))))
	     (try-completion string completions predicate)))
	  ((eq action t)
	   (let (completions
1111
		 (pattern (concat "\n\\* +\\("
1112 1113 1114 1115 1116
				  (regexp-quote string)
				  "[^:\t\n]*\\):")))
	     (save-excursion
	       (set-buffer Info-complete-menu-buffer)
	       (goto-char (point-min))
1117
	       (search-forward "\n* Menu:")
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
	       (while (re-search-forward pattern nil t)
		 (setq completions (cons (cons (format "%s"
						       (buffer-substring
							(match-beginning 1)
							(match-end 1)))
					       (match-beginning 1))
					 completions))))
	     (all-completions string completions predicate)))
	  (t
	   (save-excursion
	     (set-buffer Info-complete-menu-buffer)
	     (goto-char (point-min))
1130
	     (search-forward "\n* Menu:")
1131
	     (re-search-forward (concat "\n\\* +"
1132 1133 1134 1135 1136
					(regexp-quote string)
					":")
				nil t))))))


Jim Blandy's avatar
Jim Blandy committed
1137 1138 1139 1140 1141 1142 1143 1144
(defun Info-menu (menu-item)
  "Go to node for menu item named (or abbreviated) NAME.
Completion is allowed, and the menu item point is on is the default."
  (interactive
   (let ((completions '())
	 ;; If point is within a menu item, use that item as the default
	 (default nil)
	 (p (point))
1145
	 beg
Jim Blandy's avatar
Jim Blandy committed
1146 1147 1148 1149 1150
	 (last nil))
     (save-excursion
       (goto-char (point-min))
       (if (not (search-forward "\n* menu:" nil t))
	   (error "No menu in this node"))