From a384cab3a76f5788bd0e5290755bd089c9ab5ff0 Mon Sep 17 00:00:00 2001 From: Jim Blandy Date: Sat, 13 Jul 1991 07:49:50 +0000 Subject: [PATCH] Initial revision --- lisp/info.el | 925 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 925 insertions(+) create mode 100644 lisp/info.el diff --git a/lisp/info.el b/lisp/info.el new file mode 100644 index 00000000000..f009accc567 --- /dev/null +++ b/lisp/info.el @@ -0,0 +1,925 @@ +;; Info package for Emacs -- could use a "create node" feature. +;; Copyright (C) 1985, 1986 Free Software Foundation, Inc. + +;; 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 +;; the Free Software Foundation; either version 1, or (at your option) +;; 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 +;; along with GNU Emacs; see the file COPYING. If not, write to +;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + +(provide 'info) + +(defvar Info-history nil + "List of info nodes user has visited. +Each element of list is a list (FILENAME NODENAME BUFFERPOS).") + +(defvar Info-enable-edit nil + "Non-nil means the \\\\[Info-edit] command in Info can edit the current node.") + +(defvar Info-enable-active-nodes t + "Non-nil allows Info to execute Lisp code associated with nodes. +The Lisp code is executed when the node is selected.") + +(defvar Info-directory-list t + "List of directories to search for Info documentation files. +t means not yet initialized. In this case, Info uses the environment +variable INFODIR to initialize it.") + +(defvar Info-current-file nil + "Info file that Info is now looking at, or nil.") + +(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.") + +(defvar Info-tag-table-marker (make-marker) + "Marker pointing at beginning of current Info file's tag table. +Marker points nowhere if file has no tag table.") + +;;;###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 +to read a file name from the minibuffer." + (interactive (if current-prefix-arg + (list (read-file-name "Info file name: " nil nil t)))) + (if (eq Info-directory-list t) + (let ((path (getenv "INFOPATH")) + list) + (and path + (while (> (length path) 0) + (let ((idx (or (string-match ":" path) (length path)))) + (setq list (cons (substring path 0 idx) list) + path (substring path (min (1+ idx) (length path))))))) + (setq Info-directory-list (nreverse list)))) + (if file + (Info-goto-node (concat "(" file ")")) + (if (get-buffer "*info*") + (switch-to-buffer "*info*") + (Info-directory)))) + +;; 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) + (setq filename (substitute-in-file-name filename)) + (let ((dirs (if (string-match "^\\./" filename) + ;; If specified name starts with `./' + ;; then just try current directory. + '("./") + 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. + ;; Try downcasing, appending `.info', or both. + (cond ((file-exists-p temp) + (setq found temp)) + ((file-exists-p temp-downcase) + (setq found temp-downcase)) + ((file-exists-p (concat temp ".info")) + (setq found (concat temp ".info"))) + ((file-exists-p (concat temp-downcase ".info")) + (setq found (concat temp-downcase ".info")))) + (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))) + ;; Go into info buffer. + (switch-to-buffer "*info*") + (buffer-flush-undo (current-buffer)) + (or (eq major-mode 'Info-mode) + (Info-mode)) + (widen) + (setq Info-current-node nil) + (unwind-protect + (progn + ;; 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 + buffer-file-name nil) + (erase-buffer) + (insert-file-contents filename t) + (set-buffer-modified-p nil) + (setq default-directory (file-name-directory filename)) + ;; See whether file has a tag table. Record the location if yes. + (set-marker Info-tag-table-marker nil) + (goto-char (point-max)) + (forward-line -8) + (or (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. + (save-excursion + (let ((buf (current-buffer))) + (set-buffer (get-buffer-create " *info tag table*")) + (buffer-flush-undo (current-buffer)) + (setq case-fold-search t) + (erase-buffer) + (insert-buffer-substring buf) + (set-marker Info-tag-table-marker + (match-end 0)))) + (set-marker Info-tag-table-marker pos)))) + (setq Info-current-file + (file-name-sans-versions buffer-file-name)))) + (if (equal nodename "*") + (progn (setq Info-current-node nodename) + (Info-set-mode-line)) + ;; Search file for a suitable node. + ;; First get advice from tag table if file has one. + ;; Also, if this is an indirect info file, + ;; read the proper subfile into this buffer. + (let ((guesspos (point-min))) + (if (marker-position Info-tag-table-marker) + (save-excursion + (set-buffer (marker-buffer Info-tag-table-marker)) + (goto-char Info-tag-table-marker) + (if (search-forward (concat "Node: " nodename "\177") nil t) + (progn + (setq guesspos (read (current-buffer))) + ;; If this is an indirect file, + ;; determine which file really holds this node + ;; and read it in. + (if (not (eq (current-buffer) (get-buffer "*info*"))) + (setq guesspos + (Info-read-subfile guesspos)))) + (error "No such node: \"%s\"" nodename)))) + (goto-char (max (point-min) (- guesspos 1000)))) + ;; Now search from our advised position (or from beg of buffer) + ;; to find the actual node. + (let ((regexp (concat "Node: *" (regexp-quote nodename) " *[,\t\n]"))) + (catch 'foo + (while (search-forward "\n\^_" nil t) + (forward-line 1) + (let ((beg (point))) + (forward-line 1) + (if (re-search-backward regexp beg t) + (throw 'foo t)))) + (error "No such node: %s" nodename))) + (Info-select-node))) + ;; If we did not finish finding the specified node, + ;; go back to the previous one. + (or Info-current-node no-going-back + (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))))) + (goto-char (point-min))) + +(defun Info-read-subfile (nodepos) + (set-buffer (marker-buffer Info-tag-table-marker)) + (goto-char (point-min)) + (search-forward "\n\^_") + (let (lastfilepos + lastfilename) + (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)))) + (set-buffer (get-buffer "*info*")) + (or (equal Info-current-subfile lastfilename) + (let ((buffer-read-only nil)) + (setq buffer-file-name nil) + (widen) + (erase-buffer) + (insert-file-contents lastfilename) + (set-buffer-modified-p nil) + (setq Info-current-subfile lastfilename))) + (goto-char (point-min)) + (search-forward "\n\^_") + (+ (- nodepos lastfilepos) (point)))) + +;; 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 + (buffer-substring (point) + (progn + (skip-chars-forward "^,\t\n") + (point)))) + (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))) + (if Info-enable-active-nodes (eval active-expression))))) + +(defun Info-set-mode-line () + (setq mode-line-buffer-identification + (concat + "Info: (" + (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." + (interactive "sGoto node: ") + (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)))) + (Info-find-node (if (equal filename "") nil filename) + (if (equal nodename "") "Top" nodename)))) + +(defvar Info-last-search nil + "Default regexp for \\\\[Info-search] command to search for.") + +(defun Info-search (regexp) + "Search for REGEXP, starting from point, and select node it's found in." + (interactive "sSearch (regexp): ") + (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)) + (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 ())) + (set-buffer (marker-buffer Info-tag-table-marker)) + (goto-char (point-min)) + (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))) + (while list + (message "Searching subfile %s..." (cdr (car list))) + (Info-read-subfile (car (car list))) + (setq list (cdr list)) + (goto-char (point-min)) + (if (re-search-forward regexp nil t) + (setq found (point) list ()))) + (if found + (message "") + (signal 'search-failed (list regexp)))) + (if (not found) + (progn (Info-read-subfile opoint) + (goto-char opoint) + (Info-select-node))))) + (widen) + (goto-char found) + (Info-select-node) + (or (and (equal onode Info-current-node) + (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 + (error (concat "Node has no " (capitalize (or errorname name)))))))) + +(defun Info-following-node-name (&optional allowedchars) + (skip-chars-forward " \t") + (buffer-substring + (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"))) + +(defun Info-up () + "Go to the superior node of this node." + (interactive) + (Info-goto-node (Info-extract-pointer "up"))) + +(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) + completions default (start-point (point)) str i) + (save-excursion + (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) + (< (match-beginning 0) start-point) + (<= start-point (point)) + (setq default t)) + (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)) + (setq completions + (cons (cons str nil) + completions)))) + (if completions + (list (completing-read (if default + (concat "Follow reference named: (" + default ") ") + "Follow reference named: ") + completions default t)) + (error "No cross-references in this node")))) + (let (target beg i (str (concat "\\*note " footnotename))) + (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 ":") + (buffer-substring beg (1- (point))) + (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 ?\ )) + str)) + +(defun Info-menu-item-sequence (list) + (while list + (Info-menu-item (car list)) + (setq list (cdr list)))) + +(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)) + (last nil)) + (save-excursion + (goto-char (point-min)) + (if (not (search-forward "\n* menu:" nil t)) + (error "No menu in this node")) + (while (re-search-forward + "\n\\* \\([^:\t\n]*\\):" nil t) + (if (and (null default) + (prog1 (if last (< last p) nil) + (setq last (match-beginning 0))) + (<= p last)) + (setq default (car (car completions)))) + (setq completions (cons (cons (buffer-substring + (match-beginning 1) + (match-end 1)) + (match-beginning 1)) + completions))) + (if (and (null default) last + (< last p) + (<= p (progn (end-of-line) (point)))) + (setq default (car (car completions))))) + (let ((item nil)) + (while (null item) + (setq item (let ((completion-ignore-case t)) + (completing-read (if default + (format "Menu item (default %s): " + default) + "Menu item: ") + completions nil t))) + ;; we rely on the bug (which RMS won't change for his own reasons) + ;; that ;; completing-read accepts an input of "" even when the + ;; require-match argument is true and "" is not a valid possibility + (if (string= item "") + (if default + (setq item default) + ;; ask again + (setq item nil)))) + (list item)))) + ;; there is a problem here in that if several menu items have the same + ;; name you can only go to the node of the first with this command. + (Info-goto-node (Info-extract-menu-item menu-item))) + +(defun Info-extract-menu-item (menu-item) + (setq menu-item (regexp-quote menu-item)) + (save-excursion + (goto-char (point-min)) + (or (search-forward "\n* menu:" nil t) + (error "No menu in this node")) + (or (re-search-forward (concat "\n* " menu-item ":") nil t) + (re-search-forward (concat "\n* " menu-item) nil t) + (error "No such item in menu")) + (beginning-of-line) + (forward-char 2) + (Info-extract-menu-node-name))) + +;; If COUNT is nil, use the last item in the menu. +(defun Info-extract-menu-counting (count) + (save-excursion + (goto-char (point-min)) + (or (search-forward "\n* menu:" nil t) + (error "No menu in this node")) + (if count + (or (search-forward "\n* " nil t count) + (error "Too few items in menu")) + (while (search-forward "\n* " nil t) + nil)) + (Info-extract-menu-node-name))) + +(defun Info-first-menu-item () + "Go to the node of the first menu item." + (interactive) + (Info-goto-node (Info-extract-menu-counting 1))) + +(defun Info-second-menu-item () + "Go to the node of the second menu item." + (interactive) + (Info-goto-node (Info-extract-menu-counting 2))) + +(defun Info-third-menu-item () + "Go to the node of the third menu item." + (interactive) + (Info-goto-node (Info-extract-menu-counting 3))) + +(defun Info-fourth-menu-item () + "Go to the node of the fourth menu item." + (interactive) + (Info-goto-node (Info-extract-menu-counting 4))) + +(defun Info-fifth-menu-item () + "Go to the node of the fifth menu item." + (interactive) + (Info-goto-node (Info-extract-menu-counting 5))) + +(defun Info-top-node () + "Go to the Top node of this file." + (interactive) + (Info-goto-node "Top")) + +(defun Info-final-node () + "Go to the final node in this file." + (interactive) + (Info-goto-node "Top") + (let (Info-history) + ;; Go to the last node in the menu of Top. + (Info-goto-node (Info-extract-menu-counting nil)) + ;; If the last node in the menu is not last in pointer structure, + ;; move forward until we can't go any farther. + (while (Info-forward-node t t) nil) + ;; Then keep moving down to last subnode, unless we reach an index. + (while (and (not (string-match "\\" Info-current-node)) + (save-excursion (search-forward "\n* Menu:" nil t))) + (Info-goto-node (Info-extract-menu-counting nil))))) + +(defun Info-forward-node (&optional not-down no-error) + "Go forward one node, considering all nodes as forming one sequence." + (interactive) + (goto-char (point-min)) + (forward-line 1) + ;; three possibilities, in order of priority: + ;; 1. next node is in a menu in this node (but not in an index) + ;; 2. next node is next at same level + ;; 3. next node is up and next + (cond ((and (not not-down) + (save-excursion (search-forward "\n* menu:" nil t)) + (not (string-match "\\" Info-current-node))) + (Info-first-menu-item) + t) + ((save-excursion (search-backward "next:" nil t)) + (Info-next) + t) + ((and (save-excursion (search-backward "up:" nil t)) + (not (equal (downcase (Info-extract-pointer "up")) "top"))) + (let ((old-node Info-current-node)) + (Info-up) + (let (Info-history success) + (unwind-protect + (setq success (Info-forward-node t no-error)) + (or success (Info-goto-node old-node)))))) + (no-error nil) + (t (error "No pointer forward from this node")))) + +(defun Info-backward-node () + "Go backward one node, considering all nodes as forming one sequence." + (interactive) + (let ((prevnode (Info-extract-pointer "prev[ious]*" t)) + (upnode (Info-extract-pointer "up" t))) + (cond ((and upnode (string-match "(" upnode)) + (error "First node in file")) + ((and upnode (or (null prevnode) + (equal (downcase prevnode) (downcase upnode)))) + (Info-up)) + (prevnode + ;; If we move back at the same level, + ;; go down to find the last subnode*. + (Info-prev) + (let (Info-history) + (while (and (not (string-match "\\" Info-current-node)) + (save-excursion (search-forward "\n* Menu:" nil t))) + (Info-goto-node (Info-extract-menu-counting nil))))) + (t + (error "No pointer backward from this node"))))) + +(defun Info-exit () + "Exit Info by selecting some other buffer." + (interactive) + (switch-to-buffer (prog1 (other-buffer (current-buffer)) + (bury-buffer (current-buffer))))) + +(defun Info-undefined () + "Make command be undefined in Info." + (interactive) + (ding)) + +(defun Info-help () + "Enter the Info tutorial." + (interactive) + (delete-other-windows) + (Info-find-node "info" + (if (< (window-height) 23) + "Help-Small-Screen" + "Help"))) + +(defun Info-summary () + "Display a brief summary of all Info commands." + (interactive) + (save-window-excursion + (switch-to-buffer "*Help*") + (erase-buffer) + (insert (documentation 'Info-mode)) + (goto-char (point-min)) + (let (ch flag) + (while (progn (setq flag (not (pos-visible-in-window-p (point-max)))) + (message (if flag "Type Space to see more" + "Type Space to return to Info")) + (if (/= ?\ (setq ch (read-char))) + (progn (setq unread-command-char ch) nil) + flag)) + (scroll-up))))) + +(defun Info-get-token (pos start all &optional errorstring) + "Return the token around POS, +POS must be somewhere inside the token +START is a regular expression which will match the + beginning of the tokens delimited string +ALL is a regular expression with a single + parenthized subpattern which is the token to be + returned. E.g. '{\(.*\)}' would return any string + enclosed in braces around POS. +SIG optional fourth argument, controls action on no match + nil: return nil + t: beep + a string: signal an error, using that string." + (save-excursion + (goto-char pos) + (re-search-backward start (max (point-min) (- pos 200)) 'yes) + (while (and (re-search-forward all (min (point-max) (+ pos 200)) 'yes) + (not (and (<= (match-beginning 0) pos) + (> (match-end 0) pos))))) + (if (and (<= (match-beginning 0) pos) + (> (match-end 0) pos)) + (buffer-substring (match-beginning 1) (match-end 1)) + (cond ((null errorstring) + nil) + ((eq errorstring t) + (beep) + nil) + (t + (error "No %s around position %d" errorstring pos)))))) + +(defun Info-follow-nearest-node (event) + "\\Follow a node reference near point. Like \\[Info-menu], \\Info-follow-reference], \\[Info-next], \\[Info-previous] or \\Info-up] command. +At end of the node's text, moves to the next node." + (interactive "@e") + (let* ((relative-coordinates (coordinates-in-window-p (car event) + (selected-window))) + (rel-x (car relative-coordinates)) + (rel-y (car (cdr relative-coordinates)))) + (move-to-window-line rel-y) + (move-to-column rel-x)) + (let (node) + (cond + ((setq node (Info-get-token (point) "\\*note " "\\*note \\([^:]*\\):" t)) + (Info-follow-reference node)) + ((setq node (Info-get-token (point) "\\* " "\\* \\([^:]*\\)::" t)) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "\\* " "\\* \\([^:]*\\):" t)) + (Info-menu node)) + ((setq node (Info-get-token (point) "Up: " "Up: \\([^,\n\t]*\\)" t)) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "Next: " "Next: \\([^,\n\t]*\\)" t)) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "File: " "File: \\([^,\n\t]*\\)" t)) + (Info-goto-node "Top")) + ((setq node (Info-get-token (point) "Prev: " "Prev: \\([^,\n\t]*\\)" t)) + (Info-goto-node node)) + ((save-excursion (forward-line 1) (eobp)) + (Info-next))) + )) + +(defvar Info-mode-map nil + "Keymap containing Info commands.") +(if Info-mode-map + nil + (setq Info-mode-map (make-keymap)) + (suppress-keymap Info-mode-map) + (define-key Info-mode-map "." 'beginning-of-buffer) + (define-key Info-mode-map " " 'scroll-up) + (define-key Info-mode-map "1" 'Info-first-menu-item) + (define-key Info-mode-map "2" 'Info-second-menu-item) + (define-key Info-mode-map "3" 'Info-third-menu-item) + (define-key Info-mode-map "4" 'Info-fourth-menu-item) + (define-key Info-mode-map "5" 'Info-fifth-menu-item) + (define-key Info-mode-map "6" 'undefined) + (define-key Info-mode-map "7" 'undefined) + (define-key Info-mode-map "8" 'undefined) + (define-key Info-mode-map "9" 'undefined) + (define-key Info-mode-map "0" 'undefined) + (define-key Info-mode-map "?" 'Info-summary) + (define-key Info-mode-map "]" 'Info-forward-node) + (define-key Info-mode-map "[" 'Info-backward-node) + (define-key Info-mode-map "<" 'Info-top-node) + (define-key Info-mode-map ">" 'Info-final-node) + (define-key Info-mode-map "b" 'beginning-of-buffer) + (define-key Info-mode-map "d" 'Info-directory) + (define-key Info-mode-map "e" 'Info-edit) + (define-key Info-mode-map "f" 'Info-follow-reference) + (define-key Info-mode-map "g" 'Info-goto-node) + (define-key Info-mode-map "h" 'Info-help) + (define-key Info-mode-map "l" 'Info-last) + (define-key Info-mode-map "m" 'Info-menu) + (define-key Info-mode-map "n" 'Info-next) + (define-key Info-mode-map "p" 'Info-prev) + (define-key Info-mode-map "q" 'Info-exit) + (define-key Info-mode-map "s" 'Info-search) + (define-key Info-mode-map "u" 'Info-up) + (define-key Info-mode-map "\177" 'scroll-down)) + +(defvar Info-mode-mouse-map nil + "Mouse map for use with Info mode.") + +(if Info-mode-mouse-map + nil + (if (null (cdr global-mouse-map)) + nil + (setq Info-mode-mouse-map (make-sparse-keymap)) + (define-key Info-mode-mouse-map mouse-button-middle + 'Info-follow-nearest-node) + (define-key Info-mode-mouse-map mouse-button-left 'mouse-scroll-up-full) + (define-key Info-mode-mouse-map mouse-button-right 'mouse-scroll-down-full))) + +;; Info mode is suitable only for specially formatted data. +(put 'info-mode 'mode-class 'special) + +(defun Info-mode () + "\\ +Info mode provides commands for browsing through the Info documentation tree. +Documentation in Info is divided into \"nodes\", each of which discusses +one topic and contains references to other nodes which discuss related +topics. Info has commands to follow the references and show you other nodes. + +\\[Info-help] Invoke the Info tutorial. + +Selecting other nodes: +\\[Info-next] Move to the \"next\" node of this node. +\\[Info-previous] Move to the \"previous\" node of this node. +\\[Info-up] Move \"up\" from this node. +\\[Info-menu] Pick menu item specified by name (or abbreviation). + Picking a menu item causes another node to be selected. +\\[Info-follow-reference] Follow a cross reference. Reads name of reference. +\\[Info-last] Move to the last node you were at. + +Moving within a node: +\\[scroll-up] scroll forward a full screen. \\[scroll-down] scroll backward. +\\[beginning-of-buffer] Go to beginning of node. + +Mouse commands: +Middle Button Go to node mentioned in the text near where you click. +Left Button Scroll forward a full screen. +Right Button Scroll backward. + +Advanced commands: +\\[Info-exit] Quit Info: reselect previously selected buffer. +\\[Info-edit] Edit contents of selected node. +1 Pick first item in node's menu. +2, 3, 4, 5 Pick second ... fifth item in node's menu. +\\[Info-goto-node] Move to node specified by name. + You may include a filename as well, as (FILENAME)NODENAME. +\\[Info-search] Search through this Info file for specified regexp, + and select the node in which the next occurrence is found." + (kill-all-local-variables) + (setq major-mode 'Info-mode) + (setq mode-name "Info") + (use-local-map Info-mode-map) + (set-syntax-table text-mode-syntax-table) + (setq local-abbrev-table text-mode-abbrev-table) + (setq case-fold-search t) + (setq buffer-read-only t) + (setq buffer-mouse-map Info-mode-mouse-map) + (make-local-variable 'Info-current-file) + (make-local-variable 'Info-current-subfile) + (make-local-variable 'Info-current-node) + (make-local-variable 'Info-tag-table-marker) + (make-local-variable 'Info-history) + (Info-set-mode-line) + (run-hooks 'Info-mode-hook)) + +(defvar Info-edit-map nil + "Local keymap used within `e' command of Info.") +(if Info-edit-map + nil + (setq Info-edit-map (nconc (make-sparse-keymap) text-mode-map)) + (define-key Info-edit-map "\C-c\C-c" 'Info-cease-edit)) + +;; Info-edit mode is suitable only for specially formatted data. +(put 'info-edit-mode 'mode-class 'special) + +(defun Info-edit-mode () + "Major mode for editing the contents of an Info node. +Like text mode with the addition of Info-cease-edit +which returns to Info mode for browsing. +\\{Info-edit-map}" + ) + +(defun Info-edit () + "Edit the contents of this Info node. +Allowed only if variable `Info-enable-edit' is non-nil." + (interactive) + (or Info-enable-edit + (error "Editing info nodes is not enabled")) + (use-local-map Info-edit-map) + (setq major-mode 'Info-edit-mode) + (setq mode-name "Info Edit") + (kill-local-variable 'mode-line-buffer-identification) + (setq buffer-read-only nil) + ;; Make mode line update. + (set-buffer-modified-p (buffer-modified-p)) + (message (substitute-command-keys + "Editing: Type \\\\[Info-cease-edit] to return to info"))) + +(defun Info-cease-edit () + "Finish editing Info node; switch back to Info proper." + (interactive) + ;; Do this first, so nothing has changed if user C-g's at query. + (and (buffer-modified-p) + (y-or-n-p "Save the file? ") + (save-buffer)) + (use-local-map Info-mode-map) + (setq major-mode 'Info-mode) + (setq mode-name "Info") + (Info-set-mode-line) + (setq buffer-read-only t) + ;; Make mode line update. + (set-buffer-modified-p (buffer-modified-p)) + (and (marker-position Info-tag-table-marker) + (buffer-modified-p) + (message "Tags may have changed. Use Info-tagify if necessary")))