[mp26@os.inf.tu-dresden.de: Patch for pc-select.el]

[Richard Stallman <rms@gnu.org>]

Would someone please DTRT with this, then ack?

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Date: Wed, 14 Nov 2007 22:18:07 +0100
From: Martin Pohlack <mp26@os.inf.tu-dresden.de>
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Subject: Patch for pc-select.el

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Hi,

I tried to send the patch below to the author of pc-select.el, but his
address is no longer valid.  So I'm resending it to this address.

- ----------------------------------------------------------------------

Hi,

I just recently switched to emacs (from xemacs) and found the behavior
of pc-selection-mode (pc-select.el) a little bit irritating.

Attached is a patch which fixes this.  It basically allows using the
shift+move selection at the same time as Ctrl-Space+Move selection mode.

Originally, normal move operations (without shift) would disable the
mark unconditionally, thereby disabling the region for
Ctrl-Space-started operations.

Cheers,
Martin Pohlack


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This patch adds tracking whether we ourselves did activate the mark.
If not, we should not deactivate it later on with our move functions.

This prevents interference between manually starting a selection
(Ctrl-Space + Move) and doing shifted moves.  Both can now be used at
the same time (as in xemacs).

- --- /usr/share/emacs/23.0.60/lisp/emulation/pc-select.el	2007-11-06 10:12:29.000000000 +0100
+++ pc-select.el	2007-11-14 18:05:22.000000000 +0100
@@ -254,6 +254,10 @@
 `function-key-map' before PC Selection mode had changed that
 association.")
 
+(defvar pc-select-shifted-mark nil
+  "Holds whether we ourselves did activate the mark.  Only then
+  should we deactivate if later on.")
+
 ;;;;
 ;; misc
 ;;;;
@@ -284,7 +288,15 @@
 (defun ensure-mark()
   ;; make sure mark is active
   ;; test if it is active, if it isn't, set it and activate it
- -  (or mark-active (set-mark-command nil)))
+  (or mark-active (set-mark-command nil))
+  (setq pc-select-shifted-mark t))
+
+(defun maybe-deactivate-mark()
+  ;; maybe switch off mark (only if *we* switched it on)
+  (if pc-select-shifted-mark
+      (progn
+        (setq mark-active nil)
+        (setq pc-select-shifted-mark nil))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;; forward and mark
@@ -427,7 +439,7 @@
   "Deactivate mark; move point right ARG characters \(left if ARG negative).
 On reaching end of buffer, stop and signal error."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (forward-char arg))
 
 (defun forward-word-nomark (&optional arg)
@@ -436,13 +448,13 @@
 If an edge of the buffer is reached, point is left there
 and nil is returned."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (forward-word arg))
 
 (defun forward-line-nomark (&optional arg)
   "Deactivate mark; move cursor vertically down ARG lines."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (forward-line arg)
   (setq this-command 'forward-line)
 )
@@ -452,7 +464,7 @@
 With argument, do it that many times.  Negative arg -N means
 move backward across N balanced expressions."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (forward-sexp arg))
 
 (defun forward-paragraph-nomark (&optional arg)
@@ -464,7 +476,7 @@
 A paragraph end is the beginning of a line which is not part of the paragraph
 to which the end of the previous line belongs, or the end of the buffer."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (forward-paragraph arg))
 
 (defun next-line-nomark (&optional arg)
@@ -483,7 +495,7 @@
 Then it does not try to move vertically.  This goal column is stored
 in `goal-column', which is nil when there is none."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (with-no-warnings (next-line arg))
   (setq this-command 'next-line))
 
@@ -492,14 +504,14 @@
 With argument ARG not nil or 1, move forward ARG - 1 lines first.
 If scan reaches end of buffer, stop there without error."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (end-of-line arg)
   (setq this-command 'end-of-line))
 
 (defun backward-line-nomark (&optional arg)
   "Deactivate mark; move cursor vertically up ARG lines."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (if (null arg)
       (setq arg 1))
   (forward-line (- arg))
@@ -512,7 +524,7 @@
 Negative ARG means scroll upward.
 When calling from a program, supply a number as argument or nil."
   (interactive "P")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (cond (pc-select-override-scroll-error
 	 (condition-case nil (scroll-down arg)
 	   (beginning-of-buffer (goto-char (point-min)))))
@@ -528,7 +540,7 @@
 Don't use this command in Lisp programs!
 \(goto-char (point-max)) is faster and avoids clobbering the mark."
   (interactive "P")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (let ((size (- (point-max) (point-min))))
     (goto-char (if arg
 		   (- (point-max)
@@ -663,14 +675,14 @@
   "Deactivate mark; move point left ARG characters (right if ARG negative).
 On attempt to pass beginning or end of buffer, stop and signal error."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (backward-char arg))
 
 (defun backward-word-nomark (&optional arg)
   "Deactivate mark; move backward until encountering the end of a word.
 With argument, do this that many times."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (backward-word arg))
 
 (defun backward-sexp-nomark (&optional arg)
@@ -678,7 +690,7 @@
 With argument, do it that many times.  Negative arg -N means
 move forward across N balanced expressions."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (backward-sexp arg))
 
 (defun backward-paragraph-nomark (&optional arg)
@@ -693,7 +705,7 @@
 
 See `forward-paragraph' for more information."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (backward-paragraph arg))
 
 (defun previous-line-nomark (&optional arg)
@@ -706,7 +718,7 @@
 a semipermanent goal column to which this command always moves.
 Then it does not try to move vertically."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (with-no-warnings (previous-line arg))
   (setq this-command 'previous-line))
 
@@ -715,7 +727,7 @@
 With argument ARG not nil or 1, move forward ARG - 1 lines first.
 If scan reaches end of buffer, stop there without error."
   (interactive "p")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (beginning-of-line arg))
 
 (defun scroll-up-nomark (&optional arg)
@@ -724,7 +736,7 @@
 Negative ARG means scroll downward.
 When calling from a program, supply a number as argument or nil."
   (interactive "P")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (cond (pc-select-override-scroll-error
 	 (condition-case nil (scroll-up arg)
 	   (end-of-buffer (goto-char (point-max)))))
@@ -740,7 +752,7 @@
 Don't use this command in Lisp programs!
 \(goto-char (point-min)) is faster and avoids clobbering the mark."
   (interactive "P")
- -  (setq mark-active nil)
+  (maybe-deactivate-mark)
   (let ((size (- (point-max) (point-min))))
     (goto-char (if arg
 		   (+ (point-min)


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