--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/list-mode.el	Mon Aug 13 10:04:58 2007 +0200
@@ -0,0 +1,579 @@
+;;; list-mode.el --- Major mode for buffers containing lists of items
+
+;; Copyright (C) 1992-4, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1996 Ben Wing.
+ 
+;; Maintainer: XEmacs Development Team
+;; Keywords: extensions, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the 
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Not synched
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs.
+
+;; Cleanup, merging with FSF by Ben Wing, January 1996
+
+;;; Code:
+
+(defvar list-mode-extent nil)
+(make-variable-buffer-local 'list-mode-extent)
+
+(defvar list-mode-map nil
+  "Local map for buffers containing lists of items.")
+(or list-mode-map
+    (let ((map (setq list-mode-map (make-sparse-keymap 'list-mode-map))))
+      (suppress-keymap map)
+      (define-key map 'button2up 'list-mode-item-mouse-selected)
+      (define-key map 'button2 'undefined)
+      (define-key map "\C-m" 'list-mode-item-keyboard-selected)
+      (substitute-key-definition 'forward-char 'next-list-mode-item map
+				 global-map)
+      (substitute-key-definition 'backward-char 'previous-list-mode-item map
+				 global-map)))
+
+(defun list-mode ()
+  "Major mode for buffer containing lists of items."
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map list-mode-map)
+  (setq mode-name "List")
+  (setq major-mode 'list-mode)
+  (make-local-hook 'post-command-hook)
+  (add-hook 'post-command-hook 'set-list-mode-extent nil t)
+  (make-local-hook 'pre-command-hook)
+  (add-hook 'pre-command-hook 'list-mode-extent-pre-hook nil t)
+  (make-local-variable 'next-line-add-newlines)
+  (setq next-line-add-newlines nil)
+  (setq list-mode-extent nil)
+  (set-specifier text-cursor-visible-p nil (current-buffer))
+  (setq buffer-read-only t)
+  (goto-char (point-min))
+  (run-hooks 'list-mode-hook))
+
+;; List mode is suitable only for specially formatted data.
+(put 'list-mode 'mode-class 'special)
+
+(defvar list-mode-extent-old-point nil
+  "The value of point when pre-command-hook is called.
+Used to determine the direction of motion.")
+(make-variable-buffer-local 'list-mode-extent-old-point)
+
+(defun list-mode-extent-pre-hook ()
+  (setq list-mode-extent-old-point (point))
+  ;(setq atomic-extent-goto-char-p nil)
+)
+
+(defun set-list-mode-extent ()
+  "Move to the closest list item and set up the extent for it.
+This is called from `post-command-hook'."
+  (cond ((get-char-property (point) 'list-mode-item))
+	((and (> (point) (point-min))
+	      (get-char-property (1- (point)) 'list-mode-item))
+	 (goto-char (1- (point))))
+	(t
+	 (let ((pos (point))
+	       dirflag)
+	   ;this fucks things up more than it helps.
+	   ;atomic-extent-goto-char-p as currently defined is all broken,
+	   ;since it will be triggered if the command *ever* runs goto-char!
+	   ;(if atomic-extent-goto-char-p
+	   ;    (setq dirflag 1)
+	   (if (and list-mode-extent-old-point
+		    (> pos list-mode-extent-old-point))
+	       (setq dirflag 1)
+	     (setq dirflag -1))
+	   (next-list-mode-item dirflag)
+	   (or (get-char-property (point) 'list-mode-item)
+	       (next-list-mode-item (- dirflag))))))
+  (or (and list-mode-extent
+	   (eq (current-buffer) (extent-object list-mode-extent)))
+      (progn
+	(setq list-mode-extent (make-extent nil nil (current-buffer)))
+	(set-extent-face list-mode-extent 'list-mode-item-selected)))
+  (let ((ex (extent-at (point) nil 'list-mode-item nil 'at)))
+    (if ex
+	(progn
+	  (set-extent-endpoints list-mode-extent
+				(extent-start-position ex)
+				(extent-end-position ex))
+	  (auto-show-make-region-visible (extent-start-position ex)
+					 (extent-end-position ex)))
+      (detach-extent list-mode-extent))))
+
+(defun previous-list-mode-item (n)
+  "Move to the previous item in list-mode."
+  (interactive "p")
+  (next-list-mode-item (- n)))
+
+(defun next-list-mode-item (n)
+  "Move to the next item in list-mode.
+With prefix argument N, move N items (negative N means move backward)."
+  (interactive "p")
+  (while (and (> n 0) (not (eobp)))
+    (let ((prop (get-char-property (point) 'list-mode-item))
+	   (end (point-max)))
+      ;; If in a completion, move to the end of it.
+      (if prop
+	   (goto-char (next-single-property-change (point) 'list-mode-item
+						   nil end)))
+      ;; Move to start of next one.
+      (goto-char (next-single-property-change (point)
+					      'list-mode-item nil end)))
+    (setq n (1- n)))
+  (while (and (< n 0) (not (bobp)))
+    (let ((prop (get-char-property (1- (point)) 'list-mode-item))
+	  (end (point-min)))
+      ;; If in a completion, move to the start of it.
+      (if prop
+	  (goto-char (previous-single-property-change
+		      (point) 'list-mode-item nil end)))
+      ;; Move to end of the previous completion.
+      (goto-char (previous-single-property-change (point) 'list-mode-item
+						  nil end))
+      ;; Move to the start of that one.
+      (goto-char (previous-single-property-change (point) 'list-mode-item nil
+						  end)))
+    (setq n (1+ n))))
+
+(defun list-mode-item-selected-1 (extent event)
+  (let ((func (extent-property extent 'list-mode-item-activate-callback))
+	(user-data (extent-property extent 'list-mode-item-user-data)))
+    (if func
+	(funcall func event extent user-data))))
+
+;; we could make these two be just one function, but we want to be
+;; able to refer to them in DOC strings.
+
+(defun list-mode-item-keyboard-selected ()
+  (interactive)
+  (list-mode-item-selected-1 (extent-at (point) (current-buffer)
+					'list-mode-item nil 'at)
+			     nil))
+
+(defun list-mode-item-mouse-selected (event)
+  (interactive "e")
+  ;; Sometimes event-closest-point returns nil.
+  ;; So beep instead of bombing.
+  (let ((point (event-closest-point event)))
+    (if point
+	(list-mode-item-selected-1 (extent-at point
+					      (event-buffer event)
+					      'list-mode-item nil 'at)
+				   event)
+      (ding))))
+
+(defun add-list-mode-item (start end &optional buffer activate-callback
+				 user-data)
+  "Add a new list item in list-mode, from START to END in BUFFER.
+BUFFER defaults to the current buffer.
+This works by creating an extent for the span of text in question.
+If ACTIVATE-CALLBACK is non-nil, it should be a function of three
+  arguments (EVENT EXTENT USER-DATA) that will be called when button2
+  is pressed on the extent.  USER-DATA comes from the optional
+  USER-DATA argument."
+  (let ((extent (make-extent start end buffer)))
+    (set-extent-property extent 'list-mode-item t)
+    (set-extent-property extent 'start-open t)
+    (if activate-callback
+	(progn
+	  (set-extent-property extent 'mouse-face 'highlight)
+	  (set-extent-property extent 'list-mode-item-activate-callback
+			       activate-callback)
+	  (set-extent-property extent 'list-mode-item-user-data user-data)))
+    extent))
+
+
+;; Define the major mode for lists of completions.
+
+
+(defvar completion-highlight-first-word-only nil
+  "*Completion will only highlight the first blank delimited word if t.
+If the variable in not t or nil, the string is taken as a regexp to match for end
+of highlight")
+
+(defvar completion-setup-hook nil
+  "Normal hook run at the end of setting up the text of a completion buffer.")
+
+; Unnecessary FSFmacs crock.  We frob the extents directly in
+; display-completion-list, so no "heuristics" like this are necessary.
+;(defvar completion-fixup-function nil
+;  "A function to customize how completions are identified in completion lists.
+;`completion-setup-function' calls this function with no arguments
+;each time it has found what it thinks is one completion.
+;Point is at the end of the completion in the completion list buffer.
+;If this function moves point, it can alter the end of that completion.")
+
+(defvar completion-default-help-string
+  '(concat
+    (if (device-on-window-system-p)
+	(substitute-command-keys
+	 "Click \\<list-mode-map>\\[list-mode-item-mouse-selected] on a completion to select it.\n") "")
+    (substitute-command-keys
+     "Type \\<minibuffer-local-completion-map>\\[advertised-switch-to-completions] or \\[switch-to-completions] to move to this buffer, for keyboard selection.\n\n"))
+  "Form the evaluate to get a help string for completion lists.
+This string is inserted at the beginning of the buffer.
+See `display-completion-list'.")
+
+(defun display-completion-list (completions &rest cl-keys)
+  "Display the list of completions, COMPLETIONS, using `standard-output'.
+Each element may be just a symbol or string or may be a list of two
+ strings to be printed as if concatenated.
+Frob a mousable extent onto each completion.  This extent has properties
+ 'mouse-face (so it highlights when the mouse passes over it) and
+ 'list-mode-item (so it can be located).
+
+Keywords:
+  :activate-callback (default is `default-choose-completion')
+    See `add-list-mode-item'.
+  :user-data
+    Value passed to activation callback.
+  :window-width
+    If non-nil, width to use in displaying the list, instead of the
+    actual window's width.
+  :help-string (default is the value of `completion-default-help-string')
+    Form to evaluate to get a string to insert at the beginning of
+    the completion list buffer.  This is evaluated when that buffer
+    is the current buffer and after it has been put into
+    completion-list-mode.
+  :reference-buffer (default is the current buffer)
+    This specifies the value of `completion-reference-buffer' in
+    the completion buffer.  This specifies the buffer (normally a
+    minibuffer) that `default-choose-completion' will insert the
+    completion into.
+
+At the end, run the normal hook `completion-setup-hook'.
+It can find the completion buffer in `standard-output'.
+If `completion-highlight-first-word-only' is non-nil, then only the start
+ of the string is highlighted."
+   ;; #### I18N3 should set standard-output to be (temporarily)
+   ;; output-translating.
+  (cl-parsing-keywords
+      ((:activate-callback 'default-choose-completion)
+       :user-data
+       :reference-buffer
+       (:help-string completion-default-help-string)
+       :window-width)
+      ()
+    (let ((old-buffer (current-buffer))
+	  (bufferp (bufferp standard-output)))
+      (if bufferp
+	  (set-buffer standard-output))
+      (if (null completions)
+	  (princ (gettext
+		  "There are no possible completions of what you have typed."))
+	(let ((win-width
+	       (or cl-window-width
+		   (if bufferp
+		       ;; This needs fixing for the case of windows 
+		       ;; that aren't the same width's the frame.
+		       ;; Sadly, the window it will appear in is not known
+		       ;; until after the text has been made.
+
+		       ;; We have to use last-nonminibuf-frame here
+		       ;; and not selected-frame because if a
+		       ;; minibuffer-only frame is being used it will
+		       ;; be the selected-frame at the point this is
+		       ;; run.  We keep the selected-frame call around
+		       ;; just in case.
+		       (frame-width (or (last-nonminibuf-frame)
+					(selected-frame)))
+		     80))))
+	  (let ((count 0)
+		(max-width 0))
+	    ;; Find longest completion
+	    (let ((tail completions))
+	      (while tail
+		(let* ((elt (car tail))
+		       (len (cond ((stringp elt)
+				   (length elt))
+				  ((and (consp elt)
+					(stringp (car elt))
+					(stringp (car (cdr elt))))
+				   (+ (length (car elt))
+				      (length (car (cdr elt)))))
+				  (t
+				   (signal 'wrong-type-argument
+					   (list 'stringp elt))))))
+		  (if (> len max-width)
+		      (setq max-width len))
+		  (setq count (1+ count)
+			tail (cdr tail)))))
+        
+	    (setq max-width (+ 2 max-width)) ; at least two chars between cols
+	    (let ((rows (let ((cols (min (/ win-width max-width) count)))
+			  (if (<= cols 1)
+			      count
+			    (progn
+			      ;; re-space the columns
+			      (setq max-width (/ win-width cols))
+			      (if (/= (% count cols) 0) ; want ceiling...
+				  (1+ (/ count cols))
+                                (/ count cols)))))))
+	      (princ (gettext "Possible completions are:"))
+	      (let ((tail completions)
+		    (r 0)
+		    (regexp-string
+		     (if (eq t
+			     completion-highlight-first-word-only)
+			 "[ \t]"
+		       completion-highlight-first-word-only)))
+		(while (< r rows)
+		  (terpri)
+		  (let ((indent 0)
+			(column 0)
+			(tail2 tail))
+		    (while tail2
+		      (let ((elt (car tail2)))
+			(if (/= indent 0)
+			    (if bufferp
+				(indent-to indent 2)
+                              (while (progn (write-char ?\ )
+                                            (setq column (1+ column))
+                                            (< column indent)))))
+			(setq indent (+ indent max-width))
+			(let ((start (point))
+			      end)
+			  ;; Frob some mousable extents in there too!
+			  (if (consp elt)
+			      (progn
+				(princ (car elt))
+				(princ (car (cdr elt)))
+				(or bufferp
+				    (setq column
+					  (+ column
+					     (length (car elt))
+					     (length (car (cdr elt)))))))
+			    (progn
+			      (princ elt)
+			      (or bufferp
+				  (setq column (+ column (length
+							  elt))))))
+			  (add-list-mode-item
+			   start
+			   (progn
+			     (setq end (point))
+			     (or
+			      (and completion-highlight-first-word-only
+				   (goto-char start)
+				   (re-search-forward regexp-string end t)
+				   (match-beginning 0))
+			      end))
+			   nil cl-activate-callback cl-user-data)
+			  (goto-char end)))
+		      (setq tail2 (nthcdr rows tail2)))
+		    (setq tail (cdr tail)
+			  r (1+ r)))))))))
+      (if bufferp
+	  (set-buffer old-buffer)))
+    (save-excursion
+      (let ((mainbuf (or cl-reference-buffer (current-buffer))))
+	(set-buffer standard-output)
+	(completion-list-mode)
+	(make-local-variable 'completion-reference-buffer)
+	(setq completion-reference-buffer mainbuf)
+;;; The value 0 is right in most cases, but not for file name completion.
+;;; so this has to be turned off.
+;;;      (setq completion-base-size 0)
+	(goto-char (point-min))
+	(let ((buffer-read-only nil))
+	  (insert (eval cl-help-string)))
+	  ;; unnecessary FSFmacs crock
+	  ;;(forward-line 1)
+	  ;;(while (re-search-forward "[^ \t\n]+\\( [^ \t\n]+\\)*" nil t)
+	  ;;	  (let ((beg (match-beginning 0))
+	  ;;		(end (point)))
+	  ;;	    (if completion-fixup-function
+	  ;;		(funcall completion-fixup-function))
+	  ;;	    (put-text-property beg (point) 'mouse-face 'highlight)
+	  ;;	    (put-text-property beg (point) 'list-mode-item t)
+	  ;;	    (goto-char end)))))
+	))
+    (run-hooks 'completion-setup-hook)))
+
+(defvar completion-display-completion-list-function 'display-completion-list
+  "Function to set up the list of completions in the completion buffer.
+The function is called with one argument, the sorted list of completions.
+Particular minibuffer interface functions (e.g. `read-file-name') may
+want to change this.  To do that, set a local value for this variable
+in the minibuffer; that ensures that other minibuffer invocations will
+not be affected.")
+
+(defun minibuffer-completion-help ()
+  "Display a list of possible completions of the current minibuffer contents.
+The list of completions is determined by calling `all-completions',
+passing it the current minibuffer contents, the value of
+`minibuffer-completion-table', and the value of
+`minibuffer-completion-predicate'.  The list is displayed by calling
+the value of `completion-display-completion-list-function' on the sorted
+list of completions, with the standard output set to the completion
+buffer."
+  (interactive)
+  (message "Making completion list...")
+  (let ((completions (all-completions (buffer-string)
+                                      minibuffer-completion-table
+                                      minibuffer-completion-predicate)))
+    (message nil)
+    (if (null completions)
+        (progn
+          (ding nil 'no-completion)
+          (temp-minibuffer-message " [No completions]"))
+        (with-output-to-temp-buffer "*Completions*"
+	  (funcall completion-display-completion-list-function
+		   (sort completions #'string-lessp))))))
+
+(define-derived-mode completion-list-mode list-mode 
+  "Completion List"
+  "Major mode for buffers showing lists of possible completions.
+Type \\<completion-list-mode-map>\\[choose-completion] in the completion list\
+ to select the completion near point.
+Use \\<completion-list-mode-map>\\[mouse-choose-completion] to select one\
+ with the mouse."
+  (make-local-variable 'completion-base-size)
+  (setq completion-base-size nil))
+
+(let ((map completion-list-mode-map))
+  (define-key map "\e\e\e" 'delete-completion-window)
+  (define-key map "\C-g" 'minibuffer-keyboard-quit)
+  (define-key map "q" 'abort-recursive-edit)
+  (define-key map " " (lambda () (interactive)
+			(select-window (minibuffer-window))))
+  (define-key map "\t" (lambda () (interactive)
+			 (select-window (minibuffer-window)))))
+
+(defvar completion-reference-buffer nil
+  "Record the buffer that was current when the completion list was requested.
+This is a local variable in the completion list buffer.
+Initial value is nil to avoid some compiler warnings.")
+
+(defvar completion-base-size nil
+  "Number of chars at beginning of minibuffer not involved in completion.
+This is a local variable in the completion list buffer
+but it talks about the buffer in `completion-reference-buffer'.
+If this is nil, it means to compare text to determine which part
+of the tail end of the buffer's text is involved in completion.")
+
+(defun delete-completion-window ()
+  "Delete the completion list window.
+Go to the window from which completion was requested."
+  (interactive)
+  (let ((buf completion-reference-buffer))
+    (delete-window (selected-window))
+    (if (get-buffer-window buf)
+	 (select-window (get-buffer-window buf)))))
+
+(defun completion-do-in-minibuffer ()
+  (interactive "_")
+  (save-excursion
+    (set-buffer (window-buffer (minibuffer-window)))
+    (call-interactively (key-binding (this-command-keys)))))
+
+(defun default-choose-completion (event extent buffer)
+  "Click on an alternative in the `*Completions*' buffer to choose it."
+  (and (button-event-p event)
+       ;; Give temporary modes such as isearch a chance to turn off.
+       (run-hooks 'mouse-leave-buffer-hook))
+  (or buffer (setq buffer (symbol-value-in-buffer
+			   'completion-reference-buffer
+			   (or (and (button-event-p event)
+				    (event-buffer event))
+			       (current-buffer)))))
+  (save-selected-window
+   (and (button-event-p event)
+	(select-window (event-window event)))
+   (if (and (one-window-p t 'selected-frame)
+	    (window-dedicated-p (selected-window)))
+       ;; This is a special buffer's frame
+       (iconify-frame (selected-frame))
+     (or (window-dedicated-p (selected-window))
+	 (bury-buffer))))
+  (choose-completion-string (extent-string extent)
+			    buffer
+			    completion-base-size))
+
+;; Delete the longest partial match for STRING
+;; that can be found before POINT.
+(defun choose-completion-delete-max-match (string)
+  (let ((len (min (length string)
+		  (- (point) (point-min)))))
+    (goto-char (- (point) (length string)))
+    (if completion-ignore-case
+	 (setq string (downcase string)))
+    (while (and (> len 0)
+		 (let ((tail (buffer-substring (point)
+					       (+ (point) len))))
+		   (if completion-ignore-case
+		       (setq tail (downcase tail)))
+		   (not (string= tail (substring string 0 len)))))
+      (setq len (1- len))
+      (forward-char 1))
+    (delete-char len)))
+
+;; Switch to BUFFER and insert the completion choice CHOICE.
+;; BASE-SIZE, if non-nil, says how many characters of BUFFER's text
+;; to keep.  If it is nil, use choose-completion-delete-max-match instead.
+(defun choose-completion-string (choice &optional buffer base-size)
+  (let ((buffer (or buffer completion-reference-buffer)))
+    ;; If BUFFER is a minibuffer, barf unless it's the currently
+    ;; active minibuffer.
+    (if (and (string-match "\\` \\*Minibuf-[0-9]+\\*\\'" (buffer-name buffer))
+	      (or (not (active-minibuffer-window))
+		  (not (equal buffer
+			      (window-buffer (active-minibuffer-window))))))
+	 (error "Minibuffer is not active for completion")
+      ;; Insert the completion into the buffer where completion was requested.
+      (set-buffer buffer)
+      (if base-size
+	   (delete-region (+ base-size (point-min)) (point))
+	 (choose-completion-delete-max-match choice))
+      (insert choice)
+      (remove-text-properties (- (point) (length choice)) (point)
+			       '(highlight nil))
+      ;; Update point in the window that BUFFER is showing in.
+      (let ((window (get-buffer-window buffer t)))
+	 (set-window-point window (point)))
+      ;; If completing for the minibuffer, exit it with this choice.
+      (and (equal buffer (window-buffer (minibuffer-window)))
+	    minibuffer-completion-table
+	    (exit-minibuffer)))))
+
+(define-key minibuffer-local-completion-map [prior]
+  'switch-to-completions)
+(define-key minibuffer-local-must-match-map [prior]
+  'switch-to-completions)
+(define-key minibuffer-local-completion-map "\M-v"
+  'advertised-switch-to-completions)
+(define-key minibuffer-local-must-match-map "\M-v"
+  'advertised-switch-to-completions)
+
+(defalias 'advertised-switch-to-completions 'switch-to-completions)
+(defun switch-to-completions ()
+  "Select the completion list window."
+  (interactive)
+  ;; Make sure we have a completions window.
+  (or (get-buffer-window "*Completions*")
+      (minibuffer-completion-help))
+  (if (not (get-buffer-window "*Completions*"))
+      nil
+    (select-window (get-buffer-window "*Completions*"))
+    (goto-char (next-single-property-change (point-min) 'list-mode-item nil
+					    (point-max)))))
+
+;;; list-mode.el ends here