xemacs-beta: lisp/utils/docref.el comparison

comparison lisp/utils/docref.el @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
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children	ac2d302a0011

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+:376386a54a3c
+;;; docref.el --- Simple cross references for Elisp documentation strings
+;; Copyright (C) 1994 Free Software Foundation, Inc.
+;; Author: Vadim Geshel <vadik@unas.cs.kiev.ua>
+;; Created: 12 Jul 1994
+;; Keywords: docs, help, lisp
+;; original name was cross-ref.el.
+;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Synched up with: FSF 19.30.
+;;; Commentary:
+;;
+;; This package allows you to use a simple form of cross references in
+;; your Emacs Lisp documentation strings. Cross-references look like
+;; \\(type@[label@]data), where type defines a method for retrieving
+;; reference informatin, data is used by a method routine as an argument,
+;; and label "represents" the reference in text. If label is absent, data
+;; is used instead.
+;;
+;; Special reference labeled `back', when present, can be used to return
+;; to the previous contents of help buffer.
+;;
+;; Cross-referencing currently is intended for use in doc strings only
+;; and works only in temporary buffers (created by `with-output-to-temp-buffer').
+;; List of temp buffers in which cross-referencing is to be active is specified
+;; by variable DOCREF-BUFFERS-LIST, which contains only "*Help*" by default.
+;;
+;; Documentation strings for this package's functions and variables can serve
+;; as examples of usage.
+;;
+;;; Customization:
+;;
+;; See source. The main customization variable is `docref-methods-alist'.
+;; It consists of (type . function) pairs, where type is a string which
+;; corresponds to type in cross-references and function is called with
+;; one argument - reference `data' - when a reference is activated.
+;;
+;;; Installation:
+;;
+;; Place this file somewhere in your load-path, byte-compiled it, and add
+;; (require 'cross-ref)
+;; to your .emacs.
+;;; Code:
+;; User customizable variables
+(defvar docref-highlight-p t
+"*If non-nil, \\(f@docref-subst) highlights cross-references.
+Under window system it highlights them with face defined by
+\\(v@docref-highlight-face), on character terminal highlighted references
+look like cross-references in info mode.")
+(defvar docref-highlight-face 'highlight
+"*Face used to highlight cross-references (used by \\(f@docref-subst))")
+(defvar docref-methods-alist
+'(("f" . docref-describe-function)	; reference to a function documentation
+("v" . docref-describe-variable)	; reference to a variable documentation
+("F" . docref-read-file)		; reference to a file contents
+("s" . docref-use-string)		; reference to a string
+("V" . docref-use-variable-value)	; reference to variable value
+("0" . beep))			; just highlighted text
+"Alist which maps cross-reference ``types'' to retrieval functions.
+The car of each element is a string that serves as `type' in cross-references.
+\(See \\(f@docref-subst)).  The cdr is a function of one argument,
+to be called to find this reference.")
+(defvar docref-back-label "\nback"
+"Label to use by \\(f@docref-subst) for the go-back reference.")
+(defvar docref-back-reference nil
+"If non-nil, this is a go-back reference to add to the current buffer.
+The value specifies how to go back.  It should be suitable for use
+as the second argument to \\(f@docref-insert-label).
+\\(f@docref-subst) uses this to set up the go-back reference.")
+(defvar docref-last-active-buffer)
+;;;###autoload
+(defun docref-setup ()
+"Process docref cross-references in the current buffer.
+See also \\(f@docref-subst)."
+(interactive)
+(docref-subst (current-buffer))
+(docref-mode))
+(defvar docref-mode-map nil)
+(or docref-mode-map
+(let ((map (make-sparse-keymap)))
+(define-key map [mouse-2] 'docref-follow-mouse)
+(define-key map "\C-c\C-b" 'docref-go-back)
+(define-key map "\C-c\C-c" 'docref-follow)
+(setq docref-mode-map map)))
+(defun docref-mode ()
+"Major mode for help buffers that contain cross references.
+To follow a reference, move to it and type \\[docref-follow], or use
+\\[docref-follow-mouse].  The command \\[docref-go-back] can used to go
+back to where you came from."
+(interactive)
+(kill-all-local-variables)
+(setq major-mode 'docref-mode)
+(setq mode-name "Docref")
+(use-local-map docref-mode-map)
+(run-hooks 'docref-mode))
+(defun docref-subst (buf)
+"Parse documentation cross-references in buffer BUF.
+Find cross-reference information in a buffer and
+highlight them with face defined by \\(v@docref-highlight-face).
+Cross-reference has the following format: \\ (TYPE[@LABEL]@DATA), where
+TYPE defines method used to retrive xref data (like reading from file or
+calling \\(f@describe-function)), DATA is an argument to this method
+\(like file name or function name), and LABEL is displayed in text using
+\\(v@docref-highlight-face).
+The special reference `back' can be used to return back.
+The variable \\(v@docref-back-label) specifies the label to use for that.
+See \\(v@docref-methods-alist) for currently defined methods."
+(interactive "b")
+(save-excursion
+(set-buffer buf)
+(goto-char (point-min))
+;; The docref-seen property indicates that we have processed this
+;; buffer's contents already, so don't do it again.
+(if (not (get-text-property (point-min) 'docref-seen))
+	(let ((old-modified (buffer-modified-p)))
+	  (while (re-search-forward "[\\](\\([^\)\@]+\\)\\(@[^\)\@]+\\)?@\\([^\)]*\\))"
+				    nil t)
+	    (let* ((type (buffer-substring (match-beginning 1) (match-end 1)))
+		   (data (buffer-substring (match-beginning 3) (match-end 3)))
+		   (label
+		    (if (match-beginning 2)
+			(buffer-substring (+ (match-beginning 2) 1) (match-end 2))
+		      data)))
+	      (replace-match "" t)
+	      (docref-insert-label label (cons type data))))
+	  ;; Make a back-reference in this buffer, if desired.
+	  ;; (This is true if called from docref-follow.)
+	  (if docref-back-reference
+	      (progn
+		(goto-char (point-max))
+		(put-text-property (point-min) (1+ (point-min))
+				   'docref-back-position (point))
+		(docref-insert-label docref-back-label docref-back-reference)))
+	  (put-text-property (point-min) (1+ (point-min)) 'docref-seen t)
+	  (set-buffer-modified-p old-modified)))))
+(defun docref-insert-label (string ref)
+(let ((label (concat string)))
+;; decorate the label
+(let ((leading-space-end (save-match-data
+			       (if (string-match "^\\([ \t\n]+\\)" label)
+				   (match-end 1)
+				 0)))
+	  (trailing-space-start (save-match-data
+				  (if (string-match "\\([ \t\n]+\\)$" label)
+				      (match-beginning 1)
+				    (length label)))))
+(if docref-highlight-p
+;;	  XEmacs: we support faces on TTY's.
+;;	  (if (not window-system)
+;;	      (setq label
+;;		    (concat (substring label 0 leading-space-end)
+;;			    "(*note "
+;;			    (substring label leading-space-end trailing-space-start)
+;;			    ")"
+;;			    (substring label trailing-space-start)))
+	    ;; window-system
+	    (put-text-property leading-space-end
+			       trailing-space-start
+			       'face docref-highlight-face label))
+(put-text-property 0 (length label) 'docref ref label)
+(insert label))))
+(defun docref-follow-mouse (click)
+"Follow the cross-reference that you click on."
+(interactive "e")
+(save-excursion
+;; XEmacs changes here.
+(let* ((window (event-window click))
+	   (pos (event-point click))
+	   (docref-last-active-buffer (current-buffer)))
+(set-buffer (window-buffer window))
+(docref-follow pos))))
+(defun docref-go-back ()
+"Go back to the previous contents of help buffer."
+(interactive)
+(let ((pos (get-text-property (point-min) 'docref-back-position)))
+(if	pos
+	(docref-follow pos)
+(error "No go-back reference"))))
+(defun docref-follow (&optional pos)
+"Follow cross-reference at point.
+For the cross-reference format, see \\(f@docref-subst).
+The special reference named `back' can be used to return back"
+(interactive)
+(or pos (setq pos (point)))
+(let ((docref-data (get-text-property pos 'docref)))
+(if docref-data
+	;; There is a reference at point.  Follow it.
+	(let* ((type (car docref-data))
+	       (name (cdr docref-data))
+	       (method (assoc type docref-methods-alist))
+	       (cur-contents (buffer-string))
+	       (opoint (point))
+	       (docref-back-reference (cons "s" cur-contents))
+	       success)
+	  (if (null method)
+	      (error "Unknown cross-reference type: %s" type))
+	  (unwind-protect
+	      (save-excursion
+		(funcall (cdr method) name)
+		(setq success t))
+	    (or success
+		(progn
+		  ;; (cdr method) got an error.
+		  ;; Put back the text that we had.
+		  (erase-buffer)
+		  (insert cur-contents)
+		  (goto-char opoint)))
+	    (set-buffer-modified-p nil))))))
+;; Builtin methods for accessing a reference.
+(defun docref-describe-function (data)
+(save-excursion
+(if (boundp 'docref-last-active-buffer)
+	(set-buffer docref-last-active-buffer))
+(describe-function (intern data))))
+(defun docref-describe-variable (data)
+(save-excursion
+(if (boundp 'docref-last-active-buffer)
+	(set-buffer docref-last-active-buffer))
+(describe-variable (intern data))))
+(defun docref-read-file (data)
+(with-output-to-temp-buffer (buffer-name)
+(erase-buffer)
+(insert-file-contents (expand-file-name data))))
+(defun docref-use-string (data)
+(with-output-to-temp-buffer (buffer-name)
+(erase-buffer)
+(insert data)))
+(defun docref-use-variable-value (data)
+(let ((sym (intern data)))
+(with-output-to-temp-buffer (buffer-name)
+(erase-buffer)
+(princ (symbol-value sym)))))
+(provide 'docref)
+;;; docref.el ends here

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comparison lisp/utils/docref.el @ 0:376386a54a3c r19-14