--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/viper/viper-mous.el	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,457 @@
+;;; viper-mous.el --- mouse support for Viper
+
+;; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 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.
+
+;; Code
+
+(require 'viper-util)
+
+;; compiler pacifier
+(defvar double-click-time)
+(defvar mouse-track-multi-click-time)
+;; end compiler pacifier
+
+
+;;; Variables
+  
+;; Variable used for catching the switch-frame event.
+;; If non-nil, indicates that previous-frame should be the selected
+;; one. Used by vip-mouse-click-get-word. Not a user option.
+(defvar vip-frame-of-focus nil)
+    
+;; Frame that was selected before the switch-frame event.
+(defconst vip-current-frame-saved (selected-frame))
+  
+(defvar vip-surrounding-word-function 'vip-surrounding-word
+  "*Function that determines what constitutes a word for clicking events.
+Takes two parameters: a COUNT, indicating how many words to return, 
+and CLICK-COUNT, telling whether this is the first click, a double-click,
+or a tripple-click.")
+       
+;; time interval in millisecond within which successive clicks are
+;; considered related
+(defconst vip-multiclick-timeout (if vip-xemacs-p
+				     mouse-track-multi-click-time
+				   double-click-time)
+  "*Time interval in millisecond within which successive clicks are
+considered related.")
+
+;; current event click count; XEmacs only
+(defvar vip-current-click-count 0)
+;; time stamp of the last click event; XEmacs only
+(defvar vip-last-click-event-timestamp 0)
+
+;; Local variable used to toggle wraparound search on click.
+(vip-deflocalvar  vip-mouse-click-search-noerror t)
+	
+;; Local variable used to delimit search after wraparound.
+(vip-deflocalvar  vip-mouse-click-search-limit nil)
+	
+;; remembers prefix argument to pass along to commands invoked by second
+;; click.
+;; This is needed because in Emacs (not XEmacs), assigning to preix-arg
+;; causes Emacs to count the second click as if it was a single click
+(defvar vip-global-prefix-argument nil)
+
+
+
+;;; Code
+
+(defsubst vip-multiclick-p ()
+  (not (vip-sit-for-short vip-multiclick-timeout t)))
+
+;; Returns window where click occurs
+(defsubst vip-mouse-click-window (click)
+  (if vip-xemacs-p
+      (event-window click)
+    (posn-window (event-start click))))
+
+;; Returns window where click occurs
+(defsubst vip-mouse-click-frame (click)
+  (window-frame (vip-mouse-click-window click)))
+
+;; Returns the buffer of the window where click occurs
+(defsubst vip-mouse-click-window-buffer (click)
+  (window-buffer (vip-mouse-click-window click)))
+
+;; Returns the name of the buffer in the window where click occurs
+(defsubst vip-mouse-click-window-buffer-name (click)
+  (buffer-name (vip-mouse-click-window-buffer click)))
+
+;; Returns position of a click
+(defsubst vip-mouse-click-posn (click)
+  (if vip-xemacs-p
+      (event-point click)
+    (posn-point (event-start click))))
+	     
+
+(defun vip-surrounding-word (count click-count)
+   "Returns word surrounding point according to a heuristic.
+COUNT indicates how many regions to return.
+If CLICK-COUNT is 1, `word' is a word in Vi sense.
+If CLICK-COUNT is 2,then `word' is a Word in Vi sense.
+If the character clicked on is a non-separator and is non-alphanumeric but
+is adjacent to an alphanumeric symbol, then it is considered alphanumeric
+for the purpose of this command. If this character has a matching
+character, such as `\(' is a match for `\)', then the matching character is
+also considered alphanumeric.
+For convenience, in Lisp modes, `-' is considered alphanumeric.
+
+If CLICK-COUNT is 3 or more, returns the line clicked on with leading and
+trailing space and tabs removed. In that case, the first argument, COUNT,
+is ignored."
+   (let ((modifiers "")
+	 beg skip-flag result
+	 word-beg)
+     (if (> click-count 2)
+	 (save-excursion
+	   (beginning-of-line)
+	   (vip-skip-all-separators-forward 'within-line)
+	   (setq beg (point))
+	   (end-of-line)
+	   (setq result (buffer-substring beg (point))))
+       
+       (if (and (not (vip-looking-at-alphasep))
+		(or (save-excursion (vip-backward-char-carefully)
+				    (vip-looking-at-alpha))
+		    (save-excursion (vip-forward-char-carefully)
+				    (vip-looking-at-alpha))))
+	   (setq modifiers
+		 (cond ((looking-at "\\\\") "\\\\")
+		       ((looking-at "-") "C-C-")
+		       ((looking-at "[][]") "][")
+		       ((looking-at "[()]") ")(")
+		       ((looking-at "[{}]") "{}")
+		       ((looking-at "[<>]") "<>")
+		       ((looking-at "[`']") "`'")
+		       ((looking-at "\\^") "\\^")
+		       ((vip-looking-at-separator) "")
+		       (t (char-to-string (following-char))))
+		 ))
+       
+       ;; Add `-' to alphanum, if it wasn't added and if we are in Lisp
+       (or (looking-at "-")
+	   (not (string-match "lisp" (symbol-name major-mode)))
+	   (setq modifiers (concat modifiers "C-C-")))
+       
+       
+       (save-excursion
+	 (cond ((> click-count 1) (vip-skip-nonseparators 'backward))
+	       ((vip-looking-at-alpha modifiers)
+		(vip-skip-alpha-backward modifiers))
+	       ((not (vip-looking-at-alphasep modifiers))
+		(vip-skip-nonalphasep-backward))
+	       (t (if (> click-count 1)
+		      (vip-skip-nonseparators 'backward)
+		    (vip-skip-alpha-backward modifiers))))
+
+	 (setq word-beg (point))
+	 
+	 (setq skip-flag nil) ; don't move 1 char forw the first time
+	 (while (> count 0)
+	   (if skip-flag (vip-forward-char-carefully 1))
+	   (setq skip-flag t) ; now always move 1 char forward
+	   (if (> click-count 1)
+	       (vip-skip-nonseparators 'forward)
+	     (vip-skip-alpha-forward modifiers))
+	   (setq count (1- count)))
+
+	 (setq result (buffer-substring word-beg (point))))
+       ) ; if
+     ;; XEmacs doesn't have set-text-properties, but there buffer-substring
+     ;; doesn't return properties together with the string, so it's not needed.
+     (if vip-emacs-p
+	 (set-text-properties 0 (length result) nil result))
+     result
+     ))
+
+
+(defun vip-mouse-click-get-word (click count click-count)
+  "Returns word surrounding the position of a mouse click.
+Click may be in another window. Current window and buffer isn't changed.
+On single or double click, returns the word as determined by
+`vip-surrounding-word-function'."
+     
+  (let ((click-word "")
+	(click-pos (vip-mouse-click-posn click))
+	(click-buf (vip-mouse-click-window-buffer click)))
+    (or (natnump count) (setq count 1))
+    (or (natnump click-count) (setq click-count 1))
+     
+    (save-excursion
+      (save-window-excursion
+	(if click-pos
+	    (progn
+	      (set-buffer click-buf)
+	
+	      (goto-char click-pos)
+	      (setq click-word
+		    (funcall vip-surrounding-word-function count click-count)))
+	  (error "Click must be over a window."))
+	click-word))))
+
+
+(defun vip-mouse-click-insert-word (click arg)
+  "Insert word clicked or double-clicked on.
+With prefix argument, N, insert that many words.
+This command must be bound to a mouse click.
+The double-click action of the same mouse button must not be bound
+\(or it must be bound to the same function\).
+See `vip-surrounding-word' for the definition of a word in this case."
+  (interactive "e\nP")
+  (if vip-frame-of-focus	;; to handle clicks in another frame
+      (select-frame vip-frame-of-focus))
+      
+  ;; turn arg into a number
+  (cond ((integerp arg) nil)
+	;; prefix arg is a list when one hits C-u then command
+	((and (listp arg) (integerp (car arg)))
+	 (setq arg (car arg)))
+	(t (setq arg 1)))
+      
+  (let (click-count interrupting-event)
+    (if (and
+	 (vip-multiclick-p)
+	 ;; This trick checks if there is a pending mouse event
+	 ;; if so, we use this latter event and discard the current mouse click
+	 ;; If the next pending event is not a mouse event, we execute
+	 ;; the current mouse event
+	 (progn
+	   (setq interrupting-event (vip-read-event))
+	   (vip-mouse-event-p last-input-event)))
+	(progn ;; interrupted wait
+	  (setq vip-global-prefix-argument arg)
+	  ;; count this click for XEmacs
+	  (vip-event-click-count click))
+      ;; uninterrupted wait or the interrupting event wasn't a mouse event
+      (setq click-count (vip-event-click-count click))
+      (if (> click-count 1)
+	  (setq arg vip-global-prefix-argument
+		vip-global-prefix-argument nil))
+      (insert (vip-mouse-click-get-word click arg click-count))
+      (if (and interrupting-event
+	       (eventp interrupting-event)
+	       (not (vip-mouse-event-p interrupting-event)))
+	  (vip-set-unread-command-events interrupting-event))
+      )))
+  
+;; arg is an event. accepts symbols and numbers, too
+(defun vip-mouse-event-p (event)
+  (if (eventp event)
+      (string-match "\\(mouse-\\|frame\\|screen\\|track\\)"
+		    (prin1-to-string (vip-event-key event)))))
+  
+;; XEmacs has no double-click events. So, we must simulate.
+;; So, we have to simulate event-click-count.
+(defun vip-event-click-count (click)
+  (if vip-xemacs-p
+      (progn
+	;; if more than 1 second
+	(if (> (- (event-timestamp click) vip-last-click-event-timestamp)
+	       vip-multiclick-timeout)
+	    (setq vip-current-click-count 0))
+	(setq vip-last-click-event-timestamp (event-timestamp click)
+	      vip-current-click-count (1+ vip-current-click-count)))
+    (event-click-count click)))
+    
+
+
+(defun vip-mouse-click-search-word (click arg)
+   "Find the word clicked or double-clicked on. Word may be in another window.
+With prefix argument, N, search for N-th occurrence.
+This command must be bound to a mouse click. The double-click action of the
+same button must not be bound \(or it must be bound to the same function\).
+See `vip-surrounding-word' for the details on what constitutes a word for
+this command."
+  (interactive "e\nP")
+  (if vip-frame-of-focus	;; to handle clicks in another frame
+      (select-frame vip-frame-of-focus))
+  (let (click-word click-count
+	(previous-search-string vip-s-string))
+    
+    (if (and
+	 (vip-multiclick-p)
+	 ;; This trick checks if there is a pending mouse event
+	 ;; if so, we use this latter event and discard the current mouse click
+	 ;; If the next pending event is not a mouse event, we execute
+	 ;; the current mouse event
+	 (progn
+	   (vip-read-event)
+	   (vip-mouse-event-p last-input-event)))
+	(progn ;; interrupted wait
+	  (setq vip-global-prefix-argument 
+		(or vip-global-prefix-argument arg))
+	  ;; remember command that was before the multiclick
+	  (setq this-command last-command)
+	  ;; make sure we counted this event---needed for XEmacs only
+	  (vip-event-click-count click))
+      ;; uninterrupted wait
+      (setq click-count (vip-event-click-count click))
+      (setq click-word (vip-mouse-click-get-word click nil click-count))
+    
+      (if (> click-count 1)
+	  (setq arg vip-global-prefix-argument
+		vip-global-prefix-argument nil))
+      (setq arg (or arg 1))
+    
+      (vip-deactivate-mark)
+      (if (or (not (string= click-word vip-s-string))
+	      (not (markerp vip-search-start-marker))
+	      (not (equal (marker-buffer vip-search-start-marker)
+			  (current-buffer)))
+	      (not (eq last-command 'vip-mouse-click-search-word)))
+	  (progn
+	    (setq  vip-search-start-marker (point-marker)
+		   vip-local-search-start-marker vip-search-start-marker
+		   vip-mouse-click-search-noerror t
+		   vip-mouse-click-search-limit nil)
+	    
+	    ;; make search string known to Viper
+	    (setq vip-s-string (if vip-re-search
+				   (regexp-quote click-word)
+				 click-word))
+	    (if (not (string= vip-s-string (car vip-search-history)))
+		(setq vip-search-history
+		      (cons vip-s-string vip-search-history)))
+	    ))
+      
+      (push-mark nil t)
+      (while (> arg 0)
+	(vip-forward-word 1)
+	(condition-case nil
+	    (progn
+	      (if (not (search-forward click-word vip-mouse-click-search-limit
+				       vip-mouse-click-search-noerror))
+		  (progn
+		    (setq vip-mouse-click-search-noerror nil)
+		    (setq vip-mouse-click-search-limit
+			  (save-excursion
+			    (if (and
+				 (markerp vip-local-search-start-marker)
+				 (marker-buffer vip-local-search-start-marker))
+				(goto-char vip-local-search-start-marker))
+			    (vip-line-pos 'end)))
+			    
+		    (goto-char (point-min))
+		    (search-forward click-word
+				    vip-mouse-click-search-limit nil)))
+	      (goto-char (match-beginning 0))
+	      (message "Searching for: %s" vip-s-string)
+	      (if (<= arg 1)
+		  (vip-flash-search-pattern))
+	      )
+	  (error (beep 1)
+		 (if (or (not (string= click-word previous-search-string))
+			 (not (eq  last-command 'vip-mouse-click-search-word)))
+		     (message "`%s': String not found in %s"
+			      vip-s-string (buffer-name (current-buffer)))
+		   (message
+		    "`%s': Last occurrence in %s. Back to beginning of search"
+		    click-word (buffer-name (current-buffer)))
+		   (setq arg 1) ;; to terminate the loop
+		   (sit-for 2))
+		 (setq  vip-mouse-click-search-noerror t) 
+		 (setq  vip-mouse-click-search-limit nil)
+		 (if (and (markerp vip-local-search-start-marker)
+			  (marker-buffer vip-local-search-start-marker))
+		     (goto-char vip-local-search-start-marker))))
+	(setq arg (1- arg)))
+      )))
+  
+(defun vip-mouse-catch-frame-switch (event arg)
+  "Catch the event of switching frame.
+Usually is bound to a 'down-mouse' event to work properly. See sample
+bindings in viper.el and in the Viper manual."
+  (interactive "e\nP")
+  (setq vip-frame-of-focus nil)
+  ;; pass prefix arg along to vip-mouse-click-search/insert-word
+  (setq prefix-arg arg)
+  (if (eq last-command 'handle-switch-frame)
+      (setq vip-frame-of-focus vip-current-frame-saved))
+  ;; make Emacs forget that it executed vip-mouse-catch-frame-switch
+  (setq this-command last-command))
+      
+;; Called just before switching frames. Saves the old selected frame.
+;; Sets last-command to handle-switch-frame (this is done automatically in
+;; Emacs. 
+;; The semantics of switching frames is different in Emacs and XEmacs.
+;; In Emacs, if you select-frame A while mouse is over frame B and then
+;; start typing, input goes to frame B, which becomes selected.
+;; In XEmacs, input will go to frame A. This may be a bug in one of the
+;; Emacsen, but also may be a design decision.
+;; Also, in Emacs sending input to frame B generates handle-switch-frame
+;; event, while in XEmacs it doesn't.
+;; All this accounts for the difference in the behavior of
+;; vip-mouse-click-* commands when you click in a frame other than the one
+;; that was the last to receive input. In Emacs, focus will be in frame A
+;; until you do something other than vip-mouse-click-* command.
+;; In XEmacs, you have to manually select frame B (with the mouse click) in
+;; order to shift focus to frame B.
+(defsubst vip-remember-current-frame (frame)
+  (setq last-command 'handle-switch-frame
+	vip-current-frame-saved (selected-frame)))
+
+
+(cond ((vip-window-display-p)
+       (let* ((search-key (if vip-xemacs-p
+			      [(meta shift button1up)] [M-S-mouse-1]))
+	      (search-key-catch (if vip-xemacs-p
+				    [(meta shift button1)] [M-S-down-mouse-1]))
+	      (insert-key (if vip-xemacs-p
+			      [(meta shift button2up)] [M-S-mouse-2]))
+	      (insert-key-catch (if vip-xemacs-p
+				    [(meta shift button2)] [M-S-down-mouse-2]))
+	      (search-key-unbound (and (not (key-binding search-key))
+				       (not (key-binding search-key-catch))))
+	      (insert-key-unbound (and (not (key-binding insert-key))
+				       (not (key-binding insert-key-catch))))
+	      )
+	     
+	 (if search-key-unbound
+	     (global-set-key search-key 'vip-mouse-click-search-word))
+	 (if insert-key-unbound
+	     (global-set-key insert-key 'vip-mouse-click-insert-word))
+    
+	 ;; The following would be needed if you want to use the above two
+	 ;; while clicking in another frame. If you only want to use them
+	 ;; by clicking in another window, not frame, the bindings below
+	 ;; aren't necessary.
+	 
+	 ;; These must be bound to mouse-down event for the same mouse
+	 ;; buttons as 'vip-mouse-click-search-word and
+	 ;; 'vip-mouse-click-insert-word
+	 (if search-key-unbound
+	     (global-set-key search-key-catch   'vip-mouse-catch-frame-switch))
+	 (if insert-key-unbound
+	     (global-set-key insert-key-catch   'vip-mouse-catch-frame-switch))
+	 
+	 (if vip-xemacs-p
+	     (add-hook 'mouse-leave-frame-hook
+		       'vip-remember-current-frame)
+	   (defadvice handle-switch-frame (before vip-frame-advice activate)
+	     "Remember the selected frame before the switch-frame event." 
+	     (vip-remember-current-frame (selected-frame))))
+       )))
+
+
+
+(provide 'viper-mous)
+
+;;;  viper-mous.el ends here