diff options
Diffstat (limited to 'texinfo/emacs/info.el')
| -rw-r--r-- | texinfo/emacs/info.el | 1846 |
1 files changed, 1846 insertions, 0 deletions
diff --git a/texinfo/emacs/info.el b/texinfo/emacs/info.el new file mode 100644 index 00000000000..ead6ab92c98 --- /dev/null +++ b/texinfo/emacs/info.el @@ -0,0 +1,1846 @@ +;;; info.el --- info package for Emacs. + +;; Copyright (C) 1985, 1986, 1992, 1993, 1994 Free Software Foundation, Inc. + +;; Maintainer: FSF +;; Keywords: help + +;; 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 2, 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, Inc., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;; Note that nowadays we expect info files to be made using makeinfo. + +;;; Code: + +(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-mode-map>\\[Info-edit] command in Info can edit the current node. +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, +because that gives you a printed manual as well.") + +(defvar Info-enable-active-nodes nil + "Non-nil allows Info to execute Lisp code associated with nodes. +The Lisp code is executed when the node is selected.") +(put 'Info-enable-active-nodes 'risky-local-variable t) + +(defvar Info-fontify t + "*Non-nil enables highlighting and fonts in Info nodes.") + +(defvar Info-fontify-maximum-menu-size 30000 + "*Maximum size of menu to fontify if `Info-fontify' is non-nil.") + +(defvar Info-directory-list + (let ((path (getenv "INFOPATH")) + ;; 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) ";" ":"))) + (source (expand-file-name "info/" source-directory)) + (sibling (if installation-directory + (expand-file-name "info/" installation-directory))) + alternative) + (if path + (let ((list nil) + idx) + (while (> (length path) 0) + (setq idx (or (string-match path-separator path) (length path)) + list (cons (substring path 0 idx) list) + path (substring path (min (1+ idx) + (length path))))) + (nreverse list)) + (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)) + ;; On DOS/NT, we use movable executables always, + ;; and we must always find the Info dir at run time. + (if (or (eq system-type 'ms-dos) (eq system-type '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))))) + Info-default-directory-list + (reverse (cons alternative + (cdr (reverse Info-default-directory-list))))))) + "List of directories to search for Info documentation files. +nil means not yet initialized. In this case, Info uses the environment +variable INFOPATH to initialize it, or `Info-default-directory-list' +if there is no INFOPATH variable in the environment. +The last element of `Info-default-directory-list' is the directory +where Emacs installs the Info files that come with it. + +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.") + +(defvar Info-additional-directory-list nil + "List of additional directories to search for Info documentation files. +These directories are not searched for merging the `dir' file.") + +(defvar Info-current-file nil + "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.") + +(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.") + +(defvar Info-current-file-completions nil + "Cached completion list for current Info file.") + +(defvar Info-index-alternatives nil + "List of possible matches for last Info-index command.") + +(defvar Info-standalone nil + "Non-nil if Emacs was started solely as an Info browser.") + +(defvar Info-suffix-list + (if (eq system-type 'ms-dos) + '( (".gz" . "gunzip") + (".z" . "gunzip") + (".inf" . nil) + ("" . nil)) + '( (".info.Z" . "uncompress") + (".info.Y" . "unyabba") + (".info.gz" . "gunzip") + (".info.z" . "gunzip") + (".info" . nil) + (".Z" . "uncompress") + (".Y" . "unyabba") + (".gz" . "gunzip") + (".z" . "gunzip") + ("" . nil))) + "List of file name suffixes and associated decoding commands. +Each entry should be (SUFFIX . STRING); the file is given to +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.") + +;; Concatenate SUFFIX onto FILENAME. SUFFIX should start with a dot. +;; 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)) + ;; How long is the extension in FILENAME (not counting the dot). + (ext-len (max 0 (- (length filename) (length sans-exts) 1))) + ext-left) + ;; SUFFIX starts with a dot. If FILENAME already has one, + ;; get rid of the one in SUFFIX (unless suffix is empty). + (or (and (<= ext-len 0) + (not (eq (aref filename (1- (length filename))) ?.))) + (= (length suffix) 0) + (setq suffix (substring suffix 1))) + ;; How many chars of that extension should we keep? + (setq ext-left (min ext-len (max 0 (- 3 (length suffix))))) + ;; Get rid of the rest of the extension, and add SUFFIX. + (concat (substring filename 0 (- (length filename) + (- ext-len ext-left))) + suffix)))) + +(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." + (let ((tail Info-suffix-list) + fullname decoder) + (if (file-exists-p filename) + ;; FILENAME exists--see if that name contains a suffix. + ;; If so, set DECODE accordingly. + (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)))) + ;; Try adding suffixes to FILENAME and see if we can find something. + (while (and tail + (not (file-exists-p (info-insert-file-contents-1 + filename (car (car tail)))))) + (setq tail (cdr tail))) + ;; If we found a file with a suffix, set DECODER according to the suffix + ;; and set FULLNAME to the file's actual name. + (setq fullname (info-insert-file-contents-1 filename (car (car tail))) + decoder (cdr (car tail))) + (or tail + (error "Can't find %s or any compressed version of it" filename))) + ;; check for conflict with jka-compr + (if (and (featurep 'jka-compr) + (jka-compr-installed-p) + (jka-compr-get-compression-info fullname)) + (setq decoder nil)) + (insert-file-contents fullname visit) + (if decoder + (let ((buffer-read-only nil) + (default-directory (or (file-name-directory fullname) + default-directory))) + (call-process-region (point-min) (point-max) decoder t t))))) + +;;;###autoload (add-hook 'same-window-buffer-names "*info*") + +;;;###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. + +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." + (interactive (if current-prefix-arg + (list (read-file-name "Info file name: " nil nil t)))) + (if file + (Info-goto-node (concat "(" file ")")) + (if (get-buffer "*info*") + (pop-to-buffer "*info*") + (Info-directory)))) + +;;;###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))) + +;; 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)) + (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 ((file-exists-p + (info-insert-file-contents-1 + temp (car (car suffix-list)))) + (setq found temp)) + ((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))) + ;; Go into info buffer. + (switch-to-buffer "*info*") + (buffer-disable-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 + Info-current-file-completions nil + Info-index-alternatives 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. + (set-marker Info-tag-table-marker nil) + (goto-char (point-max)) + (forward-line -8) + ;; Use string-equal, not equal, to ignore text props. + (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. + (save-excursion + (let ((buf (current-buffer))) + (set-buffer (get-buffer-create " *info tag table*")) + (buffer-disable-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 + (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)) + ;; Search file for a suitable node. + (let ((guesspos (point-min)) + (regexp (concat "Node: *" (regexp-quote nodename) " *[,\t\n\177]"))) + ;; 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. + (if (marker-position Info-tag-table-marker) + (save-excursion + (set-buffer (marker-buffer Info-tag-table-marker)) + (goto-char Info-tag-table-marker) + (if (re-search-forward regexp 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. + (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 (null Info-history) + (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))) + +;; Cache the contents of the (virtual) dir file, once we have merged +;; it for the first time, so we can save time subsequently. +(defvar Info-dir-contents nil) + +;; Cache for the directory we decided to use for the default-directory +;; of the merged dir text. +(defvar Info-dir-contents-directory nil) + +;; Record the file attributes of all the files from which we +;; constructed Info-dir-contents. +(defvar Info-dir-file-attributes nil) + +;; Construct the Info directory node by merging the files named `dir' +;; from various directories. Set the *info* buffer's +;; default-directory to the first directory we actually get any text +;; from. +(defun Info-insert-dir () + (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) + (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))) + Info-dir-file-attributes)))) + (insert Info-dir-contents) + (let ((dirs Info-directory-list) + buffers buffer others nodes dirs-done) + + (setq Info-dir-file-attributes nil) + + ;; Search the directory list for the directory file. + (while dirs + (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. + (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))))) + (setq dirs-done + (cons truename + (cons (directory-file-name truename) + dirs-done))) + (if attrs + (save-excursion + (or buffers + (message "Composing main Info directory...")) + (set-buffer (generate-new-buffer "info dir")) + (insert-file-contents file) + (setq buffers (cons (current-buffer) buffers) + Info-dir-file-attributes + (cons (cons file attrs) + Info-dir-file-attributes)))))) + (or (cdr dirs) (setq Info-dir-contents-directory (car dirs))) + (setq dirs (cdr dirs)))) + + (or buffers + (error "Can't find the Info directory node")) + ;; Distinguish the dir file that comes with Emacs from all the + ;; others. Yes, that is really what this is supposed to do. + ;; If it doesn't work, fix it. + (setq buffer (car buffers) + others (cdr buffers)) + + ;; 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. + (insert-buffer buffer) + + ;; 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)) + (search-backward "\n\^_") + (search-forward "Node: ") + (setq nodename (Info-following-node-name)) + (search-forward "\n\^_" nil 'move) + (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) + (end (save-excursion (search-forward "\^_" nil t) (point)))) + (while nodes + (let ((nodename (car (car nodes)))) + (save-excursion + (or (member (downcase nodename) menu-items) + (re-search-forward (concat "^\\* " + (regexp-quote nodename) + "::") + end t) + (progn + (insert "* " nodename "::" "\n") + (setq menu-items (cons nodename menu-items)))))) + (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. + (if (re-search-forward (concat "\n\^_.*\n.*Node: " + (regexp-quote nodename) + "[,\n\t]") + nil t) + (progn + (search-forward "\n\^_" nil 'move) + (beginning-of-line) + (insert "\n")) + ;; If none exists, add one. + (goto-char (point-max)) + (insert "\^_\nFile: dir\tNode: " nodename "\n\n* Menu:\n\n")) + ;; Merge the text from the other buffer's menu + ;; into the menu in the like-named node in the main buffer. + (apply 'insert-buffer-substring (cdr (car nodes)))) + (setq nodes (cdr nodes))) + ;; Kill all the buffers we just made. + (while buffers + (kill-buffer (car buffers)) + (setq buffers (cdr buffers))) + (message "Composing main Info directory...done")) + (setq Info-dir-contents (buffer-string))) + (setq default-directory Info-dir-contents-directory)) + +(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) + (info-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-no-properties (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)) + (if Info-fontify (Info-fontify-node)) + (run-hooks 'Info-selection-hook)))) + +(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 (list (Info-read-node-name "Goto 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)))) + (if transient-mark-mode (deactivate-mark)) + (Info-find-node (if (equal filename "") nil filename) + (if (equal nodename "") "Top" nodename)))) + +;; 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)))))) + +(defun Info-read-node-name (prompt &optional default) + (let* ((completion-ignore-case t) + (completion-table (Info-build-node-completions)) + (nodename (completing-read prompt 'Info-read-node-name-1))) + (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) + (progn + (set-buffer (marker-buffer Info-tag-table-marker)) + (widen) + (goto-char Info-tag-table-marker) + (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)))) + +(defun Info-restore-point (hl) + "If this node has been visited, restore the point value when we left." + (while hl + (if (and (equal (nth 0 (car hl)) Info-current-file) + ;; Use string-equal, not equal, to ignore text props. + (string-equal (nth 1 (car hl)) Info-current-node)) + (progn + (goto-char (nth 2 (car hl))) + (setq hl nil)) ;terminate the while at next iter + (setq hl (cdr hl))))) + +(defvar Info-last-search nil + "Default regexp for \\<Info-mode-map>\\[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 transient-mark-mode (deactivate-mark)) + (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) + ;; Use string-equal, not equal, to ignore text props. + (or (and (string-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 "Node has no %s" (capitalize (or errorname name))))))) + +;; Return the node name in the buffer following point. +;; ALLOWEDCHARS, if non-nil, goes within [...] to make a regexp +;; saying which chas may appear in the node name. +(defun Info-following-node-name (&optional allowedchars) + (skip-chars-forward " \t") + (buffer-substring-no-properties + (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")) + (Info-restore-point Info-history)) + +(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 alt-default (start-point (point)) str i bol eol) + (save-excursion + ;; Store end and beginning of line. + (end-of-line) + (setq eol (point)) + (beginning-of-line) + (setq bol (point)) + + (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)) + ;; See if this one should be the alternate default. + (and (null alt-default) + (and (<= bol (match-beginning 0)) + (<= (point) eol)) + (setq alt-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)) + (if (eq alt-default t) (setq alt-default str)) + (setq completions + (cons (cons str nil) + completions)))) + ;; 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)))) + (if completions + (let ((input (completing-read (if default + (concat "Follow reference named: (" + default ") ") + "Follow reference named: ") + completions nil t))) + (list (if (equal input "") + default input))) + (error "No cross-references in this node")))) + (let (target beg i (str (concat "\\*note " (regexp-quote 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-no-properties 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 ?\ )) + ;; Collapse multiple spaces. + (while (string-match " +" str) + (setq str (replace-match " " t t str))) + str)) + +;; No one calls this. +;;(defun Info-menu-item-sequence (list) +;; (while list +;; (Info-menu (car list)) +;; (setq list (cdr list)))) + +(defun Info-complete-menu-item (string predicate action) + (let ((case-fold-search t)) + (cond ((eq action nil) + (let (completions + (pattern (concat "\n\\* \\(" + (regexp-quote string) + "[^:\t\n]*\\):"))) + (save-excursion + (set-buffer Info-complete-menu-buffer) + (goto-char (point-min)) + (search-forward "\n* Menu:") + (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 + (pattern (concat "\n\\* \\(" + (regexp-quote string) + "[^:\t\n]*\\):"))) + (save-excursion + (set-buffer Info-complete-menu-buffer) + (goto-char (point-min)) + (search-forward "\n* Menu:") + (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)) + (search-forward "\n* Menu:") + (re-search-forward (concat "\n\\* " + (regexp-quote string) + ":") + nil t)))))) + + +(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)) + beg + (last nil)) + (save-excursion + (goto-char (point-min)) + (if (not (search-forward "\n* menu:" nil t)) + (error "No menu in this node")) + (setq beg (point)) + (and (< (point) p) + (save-excursion + (goto-char p) + (end-of-line) + (re-search-backward "\n\\* \\([^:\t\n]*\\):" beg t) + (setq default (format "%s" (buffer-substring + (match-beginning 1) + (match-end 1))))))) + (let ((item nil)) + (while (null item) + (setq item (let ((completion-ignore-case t) + (Info-complete-menu-buffer (current-buffer))) + (completing-read (if default + (format "Menu item (default %s): " + default) + "Menu item: ") + 'Info-complete-menu-item nil t))) + ;; we rely on the fact 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-nth-menu-item () + "Go to the node of the Nth menu item. +N is the digit argument used to invoke this command." + (interactive) + (Info-goto-node + (Info-extract-menu-counting + (- (aref (this-command-keys) (1- (length (this-command-keys)))) ?0)))) + +(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 "\\<index\\>" 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 "\\<index\\>" Info-current-node))) + (Info-goto-node (Info-extract-menu-counting 1)) + t) + ((save-excursion (search-backward "next:" nil t)) + (Info-next) + t) + ((and (save-excursion (search-backward "up:" nil t)) + ;; Use string-equal, not equal, to ignore text props. + (not (string-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) + ;; Use string-equal, not equal, + ;; to ignore text properties. + (string-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 "\\<index\\>" 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) + (if Info-standalone + (save-buffers-kill-emacs) + (switch-to-buffer (prog1 (other-buffer (current-buffer)) + (bury-buffer (current-buffer)))))) + +(defun Info-next-menu-item () + (interactive) + (save-excursion + (forward-line -1) + (search-forward "\n* menu:" nil t) + (or (search-forward "\n* " nil t) + (error "No more items in menu")) + (Info-goto-node (Info-extract-menu-node-name)))) + +(defun Info-last-menu-item () + (interactive) + (save-excursion + (forward-line 1) + (let ((beg (save-excursion + (and (search-backward "\n* menu:" nil t) + (point))))) + (or (and beg (search-backward "\n* " beg t)) + (error "No previous items in menu"))) + (Info-goto-node (save-excursion + (goto-char (match-end 0)) + (Info-extract-menu-node-name))))) + +(defmacro Info-no-error (&rest body) + (list 'condition-case nil (cons 'progn (append body '(t))) '(error nil))) + +(defun Info-next-preorder () + "Go to the next subnode or the next node, or go up a level." + (interactive) + (cond ((Info-no-error (Info-next-menu-item))) + ((Info-no-error (Info-next))) + ((Info-no-error (Info-up)) + ;; Since we have already gone thru all the items in this menu, + ;; go up to the end of this node. + (goto-char (point-max)) + ;; Since logically we are done with the node with that menu, + ;; move on from it. + (Info-next-preorder)) + (t + (error "No more nodes")))) + +(defun Info-last-preorder () + "Go to the last node, popping up a level if there is none." + (interactive) + (cond ((Info-no-error + (Info-last-menu-item) + ;; If we go down a menu item, go to the end of the node + ;; so we can scroll back through it. + (goto-char (point-max))) + ;; Keep going down, as long as there are nested menu nodes. + (while (Info-no-error + (Info-last-menu-item) + ;; If we go down a menu item, go to the end of the node + ;; so we can scroll back through it. + (goto-char (point-max)))) + (recenter -1)) + ((Info-no-error (Info-prev)) + (goto-char (point-max)) + (while (Info-no-error + (Info-last-menu-item) + ;; If we go down a menu item, go to the end of the node + ;; so we can scroll back through it. + (goto-char (point-max)))) + (recenter -1)) + ((Info-no-error (Info-up)) + (goto-char (point-min)) + (or (search-forward "\n* Menu:" nil t) + (goto-char (point-max)))) + (t (error "No previous nodes")))) + +(defun Info-scroll-up () + "Scroll one screenful forward in Info, considering all nodes as one sequence. +Once you scroll far enough in a node that its menu appears on the screen, +the next scroll moves into its first subnode. When you scroll past +the end of a node, that goes to the next node or back up to the parent node." + (interactive) + (if (or (< (window-start) (point-min)) + (> (window-start) (point-max))) + (set-window-start (selected-window) (point))) + (let ((virtual-end (save-excursion + (goto-char (point-min)) + (if (search-forward "\n* Menu:" nil t) + (point) + (point-max))))) + (if (or (< virtual-end (window-start)) + (pos-visible-in-window-p virtual-end)) + (Info-next-preorder) + (scroll-up)))) + +(defun Info-scroll-down () + "Scroll one screenful back in Info, considering all nodes as one sequence. +Within the menu of a node, this goes to its last subnode. +When you scroll past the beginning of a node, that goes to the +previous node or back up to the parent node." + (interactive) + (if (or (< (window-start) (point-min)) + (> (window-start) (point-max))) + (set-window-start (selected-window) (point))) + (let* ((current-point (point)) + (virtual-end (save-excursion + (beginning-of-line) + (setq current-point (point)) + (goto-char (point-min)) + (search-forward "\n* Menu:" + current-point + t)))) + (if (or virtual-end (pos-visible-in-window-p (point-min))) + (Info-last-preorder) + (scroll-down)))) + +(defun Info-next-reference (&optional recur) + "Move cursor to the next cross-reference or menu item in the node." + (interactive) + (let ((pat "\\*note[ \n\t]*\\([^:]*\\):\\|^\\* .*:") + (old-pt (point))) + (or (eobp) (forward-char 1)) + (or (re-search-forward pat nil t) + (progn + (goto-char (point-min)) + (or (re-search-forward pat nil t) + (progn + (goto-char old-pt) + (error "No cross references in this node"))))) + (goto-char (match-beginning 0)) + (if (looking-at "\\* Menu:") + (if recur + (error "No cross references in this node") + (Info-next-reference t))))) + +(defun Info-prev-reference (&optional recur) + "Move cursor to the previous cross-reference or menu item in the node." + (interactive) + (let ((pat "\\*note[ \n\t]*\\([^:]*\\):\\|^\\* .*:") + (old-pt (point))) + (or (re-search-backward pat nil t) + (progn + (goto-char (point-max)) + (or (re-search-backward pat nil t) + (progn + (goto-char old-pt) + (error "No cross references in this node"))))) + (goto-char (match-beginning 0)) + (if (looking-at "\\* Menu:") + (if recur + (error "No cross references in this node") + (Info-prev-reference t))))) + +(defun Info-index (topic) + "Look up a string in the index for this file. +The index is defined as the first node in the top-level menu whose +name contains the word \"Index\", plus any immediately following +nodes whose names also contain the word \"Index\". +If there are no exact matches to the specified topic, this chooses +the first match which is a case-insensitive substring of a topic. +Use the `,' command to see the other matches. +Give a blank topic name to go to the Index node itself." + (interactive "sIndex topic: ") + (let ((orignode Info-current-node) + (rnode nil) + (pattern (format "\n\\* \\([^\n:]*%s[^\n:]*\\):[ \t]*\\([^.\n]*\\)\\.[ \t]*\\([0-9]*\\)" + (regexp-quote topic))) + node) + (Info-goto-node "Top") + (or (search-forward "\n* menu:" nil t) + (error "No index")) + (or (re-search-forward "\n\\* \\(.*\\<Index\\>\\)" nil t) + (error "No index")) + (goto-char (match-beginning 1)) + ;; Here, and subsequently in this function, + ;; we bind Info-history to nil for internal node-switches + ;; so that we don't put junk in the history. + ;; In the first Info-goto-node call, above, we do update the history + ;; because that is what the user's previous node choice into it. + (let ((Info-history nil)) + (Info-goto-node (Info-extract-menu-node-name))) + (or (equal topic "") + (let ((matches nil) + (exact nil) + (Info-history nil) + found) + (while + (progn + (goto-char (point-min)) + (while (re-search-forward pattern nil t) + (setq matches + (cons (list (buffer-substring (match-beginning 1) + (match-end 1)) + (buffer-substring (match-beginning 2) + (match-end 2)) + Info-current-node + (string-to-int (concat "0" + (buffer-substring + (match-beginning 3) + (match-end 3))))) + matches))) + (and (setq node (Info-extract-pointer "next" t)) + (string-match "\\<Index\\>" node))) + (Info-goto-node node)) + (or matches + (progn + (Info-goto-node orignode) + (error "No `%s' in index" topic))) + ;; Here it is a feature that assoc is case-sensitive. + (while (setq found (assoc topic matches)) + (setq exact (cons found exact) + matches (delq found matches))) + (setq Info-index-alternatives (nconc exact (nreverse matches))) + (Info-index-next 0))))) + +(defun Info-index-next (num) + "Go to the next matching index item from the last `i' command." + (interactive "p") + (or Info-index-alternatives + (error "No previous `i' command in this file")) + (while (< num 0) + (setq num (+ num (length Info-index-alternatives)))) + (while (> num 0) + (setq Info-index-alternatives + (nconc (cdr Info-index-alternatives) + (list (car Info-index-alternatives))) + num (1- num))) + (Info-goto-node (nth 1 (car Info-index-alternatives))) + (if (> (nth 3 (car Info-index-alternatives)) 0) + (forward-line (nth 3 (car Info-index-alternatives))) + (forward-line 3) ; don't search in headers + (let ((name (car (car Info-index-alternatives)))) + (Info-find-index-name name))) + (message "Found `%s' in %s. %s" + (car (car Info-index-alternatives)) + (nth 2 (car Info-index-alternatives)) + (if (cdr Info-index-alternatives) + "(Press `,' for more)" + "(Only match)"))) + +(defun Info-find-index-name (name) + "Move point to the place within the current node where NAME is defined." + (if (or (re-search-forward (format + "[a-zA-Z]+: %s\\( \\|$\\)" + (regexp-quote name)) nil t) + (search-forward (format "`%s'" name) nil t) + (and (string-match "\\`.*\\( (.*)\\)\\'" name) + (search-forward + (format "`%s'" (substring name 0 (match-beginning 1))) + nil t)) + (search-forward name nil t)) + (beginning-of-line) + (goto-char (point-min)))) + +(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)) + (help-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 (not (eq ?\ (setq ch (read-event)))) + (progn (setq unread-command-events (list ch)) nil) + flag)) + (scroll-up))) + (bury-buffer "*Help*"))) + +(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 + parenthesized 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) + (let (found) + (while (and (re-search-forward all (min (point-max) (+ pos 200)) 'yes) + (not (setq found (and (<= (match-beginning 0) pos) + (> (match-end 0) pos)))))) + (if (and found (<= (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-mouse-follow-nearest-node (click) + "\\<Info-mode-map>Follow a node reference near point. +Like \\[Info-menu], \\[Info-follow-reference], \\[Info-next], \\[Info-prev] or \\[Info-up] command, depending on where you click. +At end of the node's text, moves to the next node, or up if none." + (interactive "e") + (let* ((start (event-start click)) + (window (car start)) + (pos (car (cdr start)))) + (select-window window) + (goto-char pos)) + (and (not (Info-try-follow-nearest-node)) + (save-excursion (forward-line 1) (eobp)) + (Info-next-preorder))) + +(defun Info-follow-nearest-node () + "\\<Info-mode-map>Follow a node reference near point. +Like \\[Info-menu], \\[Info-follow-reference], \\[Info-next], \\[Info-prev] or \\[Info-up] command, depending on where point is. +If no reference to follow, moves to the next node, or up if none." + (interactive) + (or (Info-try-follow-nearest-node) + (Info-next-preorder))) + +;; Common subroutine. +(defun Info-try-follow-nearest-node () + "Follow a node reference near point. Return non-nil if successful." + (let (node) + (cond + ((setq node (Info-get-token (point) "\\*note[ \n]" + "\\*note[ \n]\\([^:]*\\):")) + (Info-follow-reference node)) + ((setq node (Info-get-token (point) "\\* " "\\* \\([^:]*\\)::")) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "\\* " "\\* \\([^:]*\\):")) + (Info-menu node)) + ((setq node (Info-get-token (point) "Up: " "Up: \\([^,\n\t]*\\)")) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "Next: " "Next: \\([^,\n\t]*\\)")) + (Info-goto-node node)) + ((setq node (Info-get-token (point) "File: " "File: \\([^,\n\t]*\\)")) + (Info-goto-node "Top")) + ((setq node (Info-get-token (point) "Prev: " "Prev: \\([^,\n\t]*\\)")) + (Info-goto-node node))) + node)) + +(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 " " 'Info-scroll-up) + (define-key Info-mode-map "\C-m" 'Info-follow-nearest-node) + (define-key Info-mode-map "\t" 'Info-next-reference) + (define-key Info-mode-map "\e\t" 'Info-prev-reference) + (define-key Info-mode-map "1" 'Info-nth-menu-item) + (define-key Info-mode-map "2" 'Info-nth-menu-item) + (define-key Info-mode-map "3" 'Info-nth-menu-item) + (define-key Info-mode-map "4" 'Info-nth-menu-item) + (define-key Info-mode-map "5" 'Info-nth-menu-item) + (define-key Info-mode-map "6" 'Info-nth-menu-item) + (define-key Info-mode-map "7" 'Info-nth-menu-item) + (define-key Info-mode-map "8" 'Info-nth-menu-item) + (define-key Info-mode-map "9" 'Info-nth-menu-item) + (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 "i" 'Info-index) + (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) + ;; For consistency with Rmail. + (define-key Info-mode-map "\M-s" 'Info-search) + (define-key Info-mode-map "t" 'Info-top-node) + (define-key Info-mode-map "u" 'Info-up) + (define-key Info-mode-map "," 'Info-index-next) + (define-key Info-mode-map "\177" 'Info-scroll-down) + (define-key Info-mode-map [mouse-2] 'Info-mouse-follow-nearest-node) + ) + +;; Info mode is suitable only for specially formatted data. +(put 'info-mode 'mode-class 'special) + +(defun Info-mode () + "\\<Info-mode-map> +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-mouse-follow-nearest-node] + Follow a node reference you click on. + This works with menu items, cross references, and + the \"next\", \"previous\" and \"up\", depending on where you click. +\\[Info-next] Move to the \"next\" node of this node. +\\[Info-prev] 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-directory] Go to the Info directory node. +\\[Info-follow-reference] Follow a cross reference. Reads name of reference. +\\[Info-last] Move to the last node you were at. +\\[Info-index] Look up a topic in this file's Index and move to that node. +\\[Info-index-next] (comma) Move to the next match from a previous `i' command. + +Moving within a node: +\\[Info-scroll-up] Normally, scroll forward a full screen. If the end of the buffer is +already visible, try to go to the next menu entry, or up if there is none. +\\[Info-scroll-down] Normally, scroll backward. If the beginning of the buffer is +already visible, try to go to the previous menu entry, or up if there is none. +\\[beginning-of-buffer] Go to beginning of node. + +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. +\\[universal-argument] \\[info] Move to new Info file with completion. +\\[Info-search] Search through this Info file for specified regexp, + and select the node in which the next occurrence is found. +\\[Info-next-reference] Move cursor to next cross-reference or menu item. +\\[Info-prev-reference] Move cursor to previous cross-reference or menu item." + (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) + (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) + (make-local-variable 'Info-index-alternatives) + (if (memq (framep (selected-frame)) '(x pc)) + (progn + (make-face 'info-node) + (make-face 'info-menu-5) + (make-face 'info-xref) + (or (face-differs-from-default-p 'info-node) + (if (face-differs-from-default-p 'bold-italic) + (copy-face 'bold-italic 'info-node) + (copy-face 'bold 'info-node))) + (or (face-differs-from-default-p 'info-menu-5) + (set-face-underline-p 'info-menu-5 t)) + (or (face-differs-from-default-p 'info-xref) + (copy-face 'bold 'info-xref))) + (setq Info-fontify nil)) + (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}" + (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) + (force-mode-line-update) + (buffer-enable-undo (current-buffer)) + (run-hooks 'Info-edit-mode-hook)) + +(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")) + (Info-edit-mode) + (message "%s" (substitute-command-keys + "Editing: Type \\<Info-edit-map>\\[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) + (force-mode-line-update) + (and (marker-position Info-tag-table-marker) + (buffer-modified-p) + (message "Tags may have changed. Use Info-tagify if necessary"))) + +(defvar Info-file-list-for-emacs + '("ediff" "forms" "gnus" "info" ("mh" . "mh-e") "sc") + "List of Info files that describe Emacs commands. +An element can be a file name, or a list of the form (PREFIX . FILE) +where PREFIX is a name prefix and FILE is the file to look in. +If the element is just a file name, the file name also serves as the prefix.") + +(defun Info-find-emacs-command-nodes (command) + "Return a list of locations documenting COMMAND. +The `info-file' property of COMMAND says which Info manual to search. +If COMMAND has no property, the variable `Info-file-list-for-emacs' +defines heuristics for which Info manual to try. +The locations are of the format used in Info-history, i.e. +\(FILENAME NODENAME BUFFERPOS\)." + (let ((where '()) + (cmd-desc (concat "^\\* " (regexp-quote (symbol-name command)) + ":\\s *\\(.*\\)\\.$")) + (info-file "emacs")) ;default + ;; Determine which info file this command is documented in. + (if (get command 'info-file) + (setq info-file (get command 'info-file)) + ;; If it doesn't say explicitly, test its name against + ;; various prefixes that we know. + (let ((file-list Info-file-list-for-emacs)) + (while file-list + (let* ((elt (car file-list)) + (name (if (consp elt) + (car elt) + elt)) + (file (if (consp elt) (cdr elt) elt)) + (regexp (concat "\\`" (regexp-quote name) + "\\(\\'\\|-\\)"))) + (if (string-match regexp (symbol-name command)) + (setq info-file file file-list nil)) + (setq file-list (cdr file-list)))))) + (save-excursion + (condition-case nil + (Info-find-node info-file "Command Index") + ;; Some manuals may not have a separate Command Index node, + ;; so try just Index instead. + (error + (Info-find-node info-file "Index"))) + ;; Take the index node off the Info history. + (setq Info-history (cdr Info-history)) + (goto-char (point-max)) + (while (re-search-backward cmd-desc nil t) + (setq where (cons (list Info-current-file + (buffer-substring + (match-beginning 1) + (match-end 1)) + 0) + where))) + where))) + +;;;###autoload +(defun Info-goto-emacs-command-node (command) + "Go to the Info node in the Emacs manual for command COMMAND. +The command is found by looking up in Emacs manual's Command Index +or in another manual found via COMMAND's `info-file' property or +the variable `Info-file-list-for-emacs'." + (interactive "CFind documentation for command: ") + (or (commandp command) + (signal 'wrong-type-argument (list 'commandp command))) + (let ((where (Info-find-emacs-command-nodes command))) + (if where + (let ((num-matches (length where))) + ;; Get Info running, and pop to it in another window. + (save-window-excursion + (info)) + (pop-to-buffer "*info*") + (Info-find-node (car (car where)) + (car (cdr (car where)))) + (if (> num-matches 1) + (progn + ;; Info-find-node already pushed (car where) onto + ;; Info-history. Put the other nodes that were found on + ;; the history. + (setq Info-history (nconc (cdr where) Info-history)) + (message "Found %d other entr%s. Use %s to see %s." + (1- num-matches) + (if (> num-matches 2) "ies" "y") + (substitute-command-keys "\\[Info-last]") + (if (> num-matches 2) "them" "it"))))) + (error "Couldn't find documentation for %s" command)))) + +;;;###autoload +(defun Info-goto-emacs-key-command-node (key) + "Go to the Info node in the Emacs manual the command bound to KEY, a string. +Interactively, if the binding is execute-extended-command, a command is read. +The command is found by looking up in Emacs manual's Command Index +or in another manual found via COMMAND's `info-file' property or +the variable `Info-file-list-for-emacs'." + (interactive "kFind documentation for key:") + (let ((command (key-binding key))) + (cond ((null command) + (message "%s is undefined" (key-description key))) + ((and (interactive-p) + (eq command 'execute-extended-command)) + (Info-goto-emacs-command-node + (read-command "Find documentation for command: "))) + (t + (Info-goto-emacs-command-node command))))) + +(defvar Info-title-face-alist + '((?* bold underline) + (?= bold-italic underline) + (?- italic underline)) + "*Alist of face or list of faces to use for pseudo-underlined titles. +The alist key is the character the title is underlined with (?*, ?= or ?-).") + +(defun Info-fontify-node () + (save-excursion + (let ((buffer-read-only nil)) + (goto-char (point-min)) + (if (looking-at "^File: [^,: \t]+,?[ \t]+") + (progn + (goto-char (match-end 0)) + (while + (looking-at "[ \t]*[^:, \t\n]+:[ \t]+\\([^:,\t\n]+\\),?") + (goto-char (match-end 0)) + (put-text-property (match-beginning 1) (match-end 1) + 'face 'info-xref) + (put-text-property (match-beginning 1) (match-end 1) + 'mouse-face 'highlight)))) + (goto-char (point-min)) + (while (re-search-forward "\n\\([^ \t\n].+\\)\n\\(\\*+\\|=+\\|-+\\)$" + nil t) + (put-text-property (match-beginning 1) (match-end 1) + 'face + (cdr (assq (preceding-char) Info-title-face-alist))) + (put-text-property (match-end 1) (match-end 2) + 'invisible t)) + (goto-char (point-min)) + (while (re-search-forward "\\*Note[ \n\t]+\\([^:]*\\):" nil t) + (if (= (char-after (1- (match-beginning 0))) ?\") ; hack + nil + (put-text-property (match-beginning 1) (match-end 1) + 'face 'info-xref) + (put-text-property (match-beginning 1) (match-end 1) + 'mouse-face 'highlight))) + (goto-char (point-min)) + (if (and (search-forward "\n* Menu:" nil t) + (not (string-match "\\<Index\\>" Info-current-node)) + ;; Don't take time to annotate huge menus + (< (- (point-max) (point)) Info-fontify-maximum-menu-size)) + (let ((n 0)) + (while (re-search-forward "^\\* \\([^:\t\n]*\\):" nil t) + (setq n (1+ n)) + (if (memq n '(5 9)) ; visual aids to help with 1-9 keys + (put-text-property (match-beginning 0) + (1+ (match-beginning 0)) + 'face 'info-menu-5)) + (put-text-property (match-beginning 1) (match-end 1) + 'face 'info-node) + (put-text-property (match-beginning 1) (match-end 1) + 'mouse-face 'highlight)))) + (set-buffer-modified-p nil)))) + +(provide 'info) + +;;; info.el ends here |