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+;;; mouse-sel.el --- Multi-click selection support for Emacs 19
+
+;; Copyright (C) 1993 Free Software Foundation, Inc.
+
+;; Author: Mike Williams <mikew@gopher.dosli.govt.nz>
+;; Keywords: mouse
+;; Version: $Revision: 1.20 $
+
+;; 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.
+
+;;; Commentary:
+;;
+;; This module provides multi-click mouse support for GNU Emacs versions
+;; 19.18 and later.  I've tried to make it behave more like standard X
+;; clients (eg. xterm) than the default Emacs 19 mouse selection handlers.
+;; Basically:
+;;
+;;   * Clicking mouse-1 starts (cancels) selection, dragging extends it.
+;;
+;;   * Clicking or dragging mouse-3 extends the selection as well.
+;;
+;;   * Double-clicking on word constituents selects words.
+;;     Double-clicking on symbol constituents selects symbols.
+;;     Double-clicking on quotes or parentheses selects sexps.
+;;     Double-clicking on whitespace selects whitespace.
+;;     Triple-clicking selects lines.
+;;
+;;   * Selecting sets the region & X primary selection, but does NOT affect
+;;     the kill-ring.  Because the mouse handlers set the primary selection
+;;     directly, mouse-sel sets the variables interprogram-cut-function
+;;     and interprogram-paste-function to nil.
+;;
+;;   * Clicking mouse-2 pastes contents of primary selection.
+;;
+;;   * Pressing mouse-2 while selecting or extending copies selected text
+;;     to the kill ring.  Pressing mouse-1 or mouse-3 kills it.
+;;
+;; This module requires my thingatpt.el module, version 1.14 or later, which
+;; it uses to find the bounds of words, lines, sexps, etc.
+;;
+;; Thanks to KevinB@bartley.demon.co.uk for his useful input.
+;;
+;;    You may also want to use one or more of following:
+;;
+;;      ;; Enable region highlight
+;;      (transient-mark-mode 1)
+;;
+;;      ;; But only in the selected window
+;;      (setq highlight-nonselected-windows nil)
+;;      
+;;      ;; Enable pending-delete
+;;      (delete-selection-mode 1)
+;;
+;;--- Customisation -------------------------------------------------------
+;;
+;; * You can control the way mouse-sel binds it's keys by setting the value
+;;   of mouse-sel-default-bindings before loading mouse-sel.
+;;
+;;   (a) If mouse-sel-default-bindings = t (the default)
+;;   
+;;       Mouse sets and pastes selection
+;;	   mouse-1		mouse-select
+;;	   mouse-2		mouse-insert-selection
+;;         mouse-3		mouse-extend
+;;
+;;       Selection/kill-ring interaction is disabled
+;;         interprogram-cut-function   = nil
+;;         interprogram-paste-function = nil
+;;
+;;   (b) If mouse-sel-default-bindings = 'interprogram-cut-paste
+;;   
+;;       Mouse sets selection, and pastes from kill-ring
+;;	   mouse-1		mouse-select
+;;	   mouse-2		mouse-yank-at-click
+;;	   mouse-3		mouse-extend
+;;  
+;;       Selection/kill-ring interaction is retained
+;;         interprogram-cut-function   = x-select-text
+;;         interprogram-paste-function = x-cut-buffer-or-selection-value
+;;         
+;;       What you lose is the ability to select some text in
+;;       delete-selection-mode and yank over the top of it.
+;;       
+;;   (c) If mouse-sel-default-bindings = nil, no bindings are made.
+;;
+;; * I like to leave point at the end of the region nearest to where the
+;;   mouse was, even though this makes region highlighting mis-leading (the
+;;   cursor makes it look like one extra character is selected).  You can
+;;   disable this behaviour with:
+;;
+;;     (setq mouse-sel-leave-point-near-mouse nil)
+;;
+;; * Normally, the selection highlight will be removed when the mouse is
+;;   lifted.  You can tell mouse-sel to retain the selection highlight
+;;   (useful if you don't use transient-mark-mode) with:
+;;
+;;     (setq mouse-sel-retain-highlight t)
+;;
+;; * By default, mouse-select cycles the click count after 3 clicks.  That
+;;   is, clicking mouse-1 four times has the same effect as clicking it
+;;   once, clicking five times has the same effect as clicking twice, etc.
+;;   Disable this behaviour with:
+;;
+;;     (setq mouse-sel-cycle-clicks nil)
+;;
+;; * The variables mouse-sel-{set,get,check}-selection-function control how
+;;   the selection is handled.  Under X Windows, these variables default so
+;;   that the X primary selection is used.  Under other windowing systems,
+;;   alternate functions are used, which simply store the selection value
+;;   in a variable.
+;;
+;;--- Hints ---------------------------------------------------------------
+;;
+;; * You can change the selection highlight face by altering the properties
+;;   of mouse-drag-overlay, eg.
+;;
+;;     (overlay-put mouse-drag-overlay 'face 'bold)
+;;
+;; * Pasting from the primary selection under emacs 19.19 is SLOW (there's
+;;   a two second delay).  The following code will cause mouse-sel to use
+;;   the cut buffer rather than the primary selection.  However, be aware
+;;   that cut buffers are OBSOLETE, and some X applications may not support
+;;   them.
+;;   
+;;     (setq mouse-sel-set-selection-function 'x-select-text
+;;           mouse-sel-get-selection-function 'x-get-cut-buffer)
+;;           
+;;--- Warnings ------------------------------------------------------------
+;;
+;; * When selecting sexps, the selection extends by sexps at the same
+;;   nesting level.  This also means the selection cannot be extended out
+;;   of the enclosing nesting level.  This is INTENTIONAL.
+
+;;; Code:
+
+(provide 'mouse-sel)
+
+(require 'mouse)
+(require 'thingatpt)
+
+;;=== Version =============================================================
+
+(defconst mouse-sel-version (substring "$Revision: 1.20 $" 11 -2)
+  "The revision number of mouse-sel (as string).  The complete RCS id is:
+
+  $Id: mouse-sel.el,v 1.20 1993/09/30 23:57:32 mike Exp $")
+
+;;=== User Variables ======================================================
+
+(defvar mouse-sel-leave-point-near-mouse t
+  "*Leave point near last mouse position.
+If non-nil, \\[mouse-select] and \\[mouse-extend] will leave point at the end
+of the region nearest to where the mouse last was.
+If nil, point will always be placed at the beginning of the region.")
+
+(defvar mouse-sel-retain-highlight nil
+  "*Retain highlight on mouse-drag-overlay.
+If non-nil, regions selected using \\[mouse-select] and \\[mouse-extend] will
+remain highlighted.
+If nil, highlighting will be turned off when the mouse is lifted.")
+
+(defvar mouse-sel-cycle-clicks t
+  "*If non-nil, \\[mouse-select] cycles the click-counts after 3 clicks.
+Ie. 4 clicks = 1 click, 5 clicks = 2 clicks, etc.")
+
+(defvar mouse-sel-default-bindings t
+  "Set to nil before loading mouse-sel to prevent default mouse bindings.")
+
+;;=== Selection ===========================================================
+
+(defvar mouse-sel-selection-type nil "Type of current selection")
+(make-variable-buffer-local 'mouse-sel-selection-type)
+
+(defvar mouse-sel-selection "" 
+  "This variable is used to store the selection value when mouse-sel is
+used on windowing systems other than X Windows.")
+
+(defvar mouse-sel-set-selection-function 
+  (if (eq window-system 'x) 
+      (function (lambda (s) (x-set-selection 'PRIMARY s)))
+    (function (lambda (s) (setq mouse-sel-selection s))))
+  "Function to call to set selection.
+Called with one argument, the text to select.")
+
+(defvar mouse-sel-get-selection-function
+  (if (eq window-system 'x) 
+      'x-get-selection 
+    (function (lambda () mouse-sel-selection)))
+  "Function to call to get the selection.
+Called with no argument, it should return the selected text.")
+
+(defvar mouse-sel-check-selection-function
+  (if (eq window-system 'x) 
+      'x-selection-owner-p 
+    nil)
+  "Function to check whether emacs still owns the selection.
+Called with no arguments.")
+
+(defun mouse-sel-determine-selection-type (NCLICKS)
+  "Determine what `thing' \\[mouse-select] and \\[mouse-extend] should
+select by.  The first argument is NCLICKS, is the number of consecutive
+mouse clicks at the same position."
+  (let* ((next-char (char-after (point)))
+	 (char-syntax (if next-char (char-syntax next-char)))
+	 (nclicks (if mouse-sel-cycle-clicks (1+ (% (1- NCLICKS) 3)) NCLICKS)))
+    (cond
+     ((= nclicks 1) nil)
+     ((>= nclicks 3) 'line)
+     ((memq char-syntax '(?\( ?\) ?\" ?')) 'sexp)
+     ((memq next-char '(? ?\t ?\n)) 'whitespace)
+     ((eq char-syntax ?_) 'symbol)
+     ((eq char-syntax ?w) 'word))))
+
+(defun mouse-select (EVENT)
+  "Set region/selection using the mouse.
+
+On click, point & mark are set to click position, and mark is disabled.
+Dragging extends region/selection.
+
+Double-clicking on word constituents selects words.
+Double-clicking on symbol constituents selects symbols.
+Double-clicking on quotes or parentheses selects sexps.
+Double-clicking on whitespace selects whitespace.
+Triple-clicking selects lines.
+
+Clicking mouse-2 while selecting copies the region to the kill-ring.
+Clicking mouse-1 or mouse-3 kills the region.
+
+This should be bound to a down-mouse event."
+  (interactive "e")
+  (mouse-set-point EVENT)
+  (setq mouse-sel-selection-type
+	(mouse-sel-determine-selection-type (event-click-count EVENT)))
+  (let ((object-bounds (bounds-of-thing-at-point mouse-sel-selection-type)))
+    (if object-bounds
+	(progn
+	  (setq mark-active t)
+	  (goto-char (car object-bounds))
+	  (set-mark (cdr object-bounds)))
+      (deactivate-mark)))
+  (mouse-extend))
+
+(defun mouse-extend (&optional EVENT)
+  "Extend region/selection using the mouse.
+
+See documentation for mouse-select for more details.
+
+This should be bound to a down-mouse event."
+  (interactive "e")
+  (if EVENT (select-window (posn-window (event-end EVENT))))
+  (let* ((min (if mark-active (region-beginning) (point)))
+	 (max (if mark-active (region-end) (point)))
+	 (orig-window (selected-window))
+	 (orig-window-frame (window-frame orig-window))
+	 (top (nth 1 (window-edges orig-window)))
+	 (bottom (nth 3 (window-edges orig-window)))
+	 (orig-cursor-type 
+	  (cdr (assoc 'cursor-type (frame-parameters (selected-frame)))))
+	 direction
+	 event)
+
+    ;; Inhibit normal region highlight
+    (setq mark-active nil)
+
+    ;; Highlight region (forcing re-highlight)
+    (move-overlay mouse-drag-overlay min max (current-buffer))
+    (overlay-put mouse-drag-overlay 'face
+		 (overlay-get mouse-drag-overlay 'face))
+
+    ;; Bar cursor
+    (modify-frame-parameters (selected-frame) '((cursor-type . bar)))
+
+    ;; Handle dragging
+    (unwind-protect
+	(progn 
+	  (track-mouse
+	    
+	    (while (if EVENT		; Use initial event
+		       (prog1
+			   (setq event EVENT)
+			 (setq EVENT nil))
+		     (setq event (read-event))
+		     (and (consp event)
+			  (memq (car event) '(mouse-movement switch-frame))))
+		  
+	      (let ((end (event-end event)))
+		    
+		(cond
+		     
+		 ;; Ignore any movement outside the frame
+		 ((eq (car-safe event) 'switch-frame) nil)
+		 ((and (posn-window end)
+		       (not (eq (window-frame (posn-window end))
+				(window-frame orig-window)))) nil)
+		     
+		 ;; Different window, same frame
+		 ((not (eq (posn-window end) orig-window))
+		  (let ((end-row (cdr (cdr (mouse-position)))))
+		    (cond
+		     ((and end-row (not (bobp)) (< end-row top))
+		      (mouse-scroll-subr (- end-row top)
+					 mouse-drag-overlay max))
+		     ((and end-row (not (eobp)) (>= end-row bottom))
+		      (mouse-scroll-subr (1+ (- end-row bottom))
+					 mouse-drag-overlay min))
+		     )))
+
+		 ;; On the mode line
+		 ((eq (posn-point end) 'mode-line)
+		  (mouse-scroll-subr 1 mouse-drag-overlay min))
+
+		 ;; In original window
+		 (t (goto-char (posn-point end)))
+
+		 )
+
+		;; Determine direction of drag
+		(cond
+		 ((and (not direction) (not (eq min max)))
+		  (setq direction (if (< (point) (/ (+ min max) 2)) -1 1)))
+		 ((and (not (eq direction -1)) (<= (point) min))
+		  (setq direction -1))
+		 ((and (not (eq direction 1)) (>= (point) max))
+		  (setq direction 1)))
+		
+		(if (not mouse-sel-selection-type) nil
+		  
+		  ;; If dragging forward, goal is next character
+		  (if (and (eq direction 1) (not (eobp))) (forward-char 1))
+		  
+		  ;; Move to start/end of selected thing
+		  (let ((goal (point))
+			last)
+		    (goto-char (if (eq 1 direction) min max))
+		    (condition-case nil
+			(progn
+			  (while (> (* direction (- goal (point))) 0)
+			    (setq last (point))
+			    (forward-thing mouse-sel-selection-type 
+					   direction))
+			  (let ((end (point)))
+			    (forward-thing mouse-sel-selection-type
+					   (- direction))
+			    (goto-char
+			     (if (> (* direction (- goal (point))) 0)
+				 end last))))
+		      (error))))
+		
+		;; Move overlay
+		(move-overlay mouse-drag-overlay
+			      (if (eq 1 direction) min (point))
+			      (if (eq -1 direction) max (point))
+			      (current-buffer))
+	      
+		)))			; end track-mouse
+
+	  (let ((overlay-start (overlay-start mouse-drag-overlay))
+		(overlay-end (overlay-end mouse-drag-overlay)))
+
+	    ;; Set region
+	    (if (eq overlay-start overlay-end)
+		(deactivate-mark)
+	      (if (and mouse-sel-leave-point-near-mouse (eq direction 1))
+		  (progn
+		    (set-mark overlay-start)
+		    (goto-char overlay-end))
+		(set-mark overlay-end)
+		(goto-char overlay-start)))
+	    
+	    ;; Set selection
+	    (if (and mark-active mouse-sel-set-selection-function)
+		(funcall mouse-sel-set-selection-function 
+			 (buffer-substring overlay-start overlay-end)))
+	      
+	    ;; Handle copy/kill
+	    (cond
+	     ((eq (car-safe last-input-event) 'down-mouse-2)
+	      (copy-region-as-kill overlay-start overlay-end)
+	      (read-event) (read-event))
+	     ((memq (car-safe last-input-event) '(down-mouse-1 down-mouse-3))
+	      (kill-region overlay-start overlay-end)
+	      (deactivate-mark)
+	      (read-event) (read-event)))))
+
+      ;; Restore cursor
+      (modify-frame-parameters (selected-frame) 
+			       (list (cons 'cursor-type orig-cursor-type)))
+      ;; Remove overlay
+      (or mouse-sel-retain-highlight
+	  (delete-overlay mouse-drag-overlay)))))
+
+(defun mouse-insert-selection (click)
+  "Insert the contents of the selection at mouse click."
+  (interactive "e")
+  (mouse-set-point click)
+  (deactivate-mark)
+  (if mouse-sel-get-selection-function
+      (insert (or (funcall mouse-sel-get-selection-function) ""))))
+
+(defun mouse-sel-validate-selection ()
+  "Remove selection highlight if emacs no longer owns the primary selection."
+  (or (not mouse-sel-check-selection-function)
+      (funcall mouse-sel-check-selection-function)
+      (delete-overlay mouse-drag-overlay)))
+
+(add-hook 'pre-command-hook 'mouse-sel-validate-selection)
+
+;;=== Key bindings ========================================================
+
+(if (not mouse-sel-default-bindings) nil
+  
+  (global-unset-key [mouse-1])
+  (global-unset-key [drag-mouse-1])
+  (global-unset-key [mouse-3])
+  
+  (global-set-key [down-mouse-1]	'mouse-select)
+  (global-set-key [down-mouse-3] 	'mouse-extend)
+  
+  (if (eq mouse-sel-default-bindings 'interprogram-cut-paste) nil
+    
+    (global-set-key [mouse-2] 	'mouse-insert-selection)
+    (setq interprogram-cut-function nil
+	  interprogram-paste-function nil))
+  
+  )
+
+;; mouse-sel.el ends here.