info.el

gcc-2.95.3 Linux下最常用的C编译器

			  (forward-line 2)
			  (looking-at "(Indirect)\n"))
			;; It is indirect.  Copy it to another buffer
			;; and record that the tag table is in that buffer.
			(let ((buf (current-buffer))
			      (tagbuf
			       (or Info-tag-table-buffer
				   (generate-new-buffer " *info tag table*"))))
			  (setq Info-tag-table-buffer tagbuf)
			  (save-excursion
			    (set-buffer tagbuf)
                            (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) tagbuf))
		      (set-marker Info-tag-table-marker pos)))
		(set-marker Info-tag-table-marker nil))
	      (setq Info-current-file
		    (if (eq filename t) "dir" filename))))
	;; Use string-equal, not equal, to ignore text props.
	(if (string-equal nodename "*")
	    (progn (setq Info-current-node nodename)
		   (Info-set-mode-line))
	  ;; 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
		  (let ((m Info-tag-table-marker)
			found found-mode)
		    (save-excursion
		      (set-buffer (marker-buffer m))
		      (goto-char m)
		      (beginning-of-line) ;so re-search will work.
		      (setq found (re-search-forward regexp nil t))
		      (if found
			  (setq guesspos (read (current-buffer))))
		      (setq found-mode major-mode))
		    (if found
			(progn
			  ;; If this is an indirect file, determine
			  ;; which file really holds this node and
			  ;; read it in.
			  (if (not (eq found-mode 'Info-mode))
			      ;; Note that the current buffer must be
			      ;; the *info* buffer on entry to
			      ;; Info-read-subfile.  Thus the hackery
			      ;; above.
			      (setq guesspos (Info-read-subfile guesspos))))
		      (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
			       (file-name-as-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))

;; Note that on entry to this function the current-buffer must be the
;; *info* buffer; not the info tags buffer.
(defun Info-read-subfile (nodepos)
  ;; NODEPOS is either a position (in the Info file as a whole,
  ;; not relative to a subfile) or the name of a subfile.
  (let (lastfilepos
	lastfilename)
    (if (numberp nodepos)
	(save-excursion
	  (set-buffer (marker-buffer Info-tag-table-marker))
	  (goto-char (point-min))
	  (search-forward "\n\^_")
	  (forward-line 2)
	  (catch 'foo
	    (while (not (looking-at "\^_"))
	      (if (not (eolp))
		  (let ((beg (point))
			thisfilepos thisfilename)
		    (search-forward ": ")
		    (setq thisfilename  (buffer-substring beg (- (point) 2)))
		    (setq thisfilepos (read (current-buffer)))
		    ;; read in version 19 stops at the end of number.
		    ;; Advance to the next line.
		    (forward-line 1)
		    (if (> thisfilepos nodepos)
			(throw 'foo t))
		    (setq lastfilename thisfilename)
		    (setq lastfilepos thisfilepos))
		(forward-line 1)))))
      (setq lastfilename nodepos)
      (setq lastfilepos 0))
    ;; Assume previous buffer is in Info-mode.
    ;; (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\^_")
    (if (numberp nodepos)
	(+ (- 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 nil t)))
    (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