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bug#10906: 24.0.94; `c-mark-function' does set the mark well

From: Alan Mackenzie
Subject: bug#10906: 24.0.94; `c-mark-function' does set the mark well
Date: Wed, 7 Mar 2012 21:09:29 +0000
User-agent: Mutt/1.5.21 (2010-09-15)

Hello, Dani.

On Mon, Mar 05, 2012 at 11:36:52PM +0100, Dani Moncayo wrote:
> On Mon, Mar 5, 2012 at 19:41, Alan Mackenzie <address@hidden> wrote:

> > Here is a patch which should fix these problems.  The logic around
> > transient-mark-mode is somewhat complicated, so I would be grateful if
> > you would check the patch does the Right Thing.  I haven't amended the
> > doc string yet.  Thanks!

> Thank you.

> I've tried your patch, and it seems to work[*], at least with my usage
> pattern, i.e., with `transient-mark-mode' enabled.

> [*] Except for one thing:
>  - If you do `C-M-h' several times in a row until the mark reaches the
> end of the file, the point ends up at the end of the region, and the
> mark at the beginning (which doesn't seem right).
>  - If you try the same experiment with `mark-defun', the mark stays at
> the end and the point at the start of the region (as expected).

Thanks for spotting that.

Here's a revised patch.  I think it'll work this time.

diff -r f6961b0b1c51 cc-cmds.el
--- a/cc-cmds.el        Fri Mar 02 21:25:40 2012 +0000
+++ b/cc-cmds.el        Wed Mar 07 21:06:31 2012 +0000
@@ -1950,7 +1950,12 @@
 (defun c-mark-function ()
   "Put mark at end of the current top-level declaration or macro, point at 
-If point is not inside any then the closest following one is chosen.
+If point is not inside any then the closest following one is
+chosen.  Each successive call of this command extends the marked
+region by one function.
+A mark is left where the command started, unless the region is already active
+\(in Transient Mark mode).
 As opposed to \\[c-beginning-of-defun] and \\[c-end-of-defun], this
 function does not require the declaration to contain a brace block."
@@ -1966,8 +1971,24 @@
     (if (not decl-limits)
        (error "Cannot find any declaration")
-      (goto-char (car decl-limits))
-      (push-mark (cdr decl-limits) nil t))))
+      (let* ((extend-region-p
+             (or (and (eq this-command 'c-mark-function)
+                      (eq last-command 'c-mark-function))))
+            (push-mark-p (and (eq this-command 'c-mark-function)
+                              (not extend-region-p)
+                              (not (and transient-mark-mode mark-active)))))
+       (if push-mark-p (push-mark (point)))
+       (if extend-region-p
+           (progn
+             (exchange-point-and-mark)
+             (setq decl-limits (c-declaration-limits t))
+             (when (not decl-limits)
+               (exchange-point-and-mark)
+               (error "Cannot find any declaration"))
+             (goto-char (cdr decl-limits))
+             (exchange-point-and-mark))
+         (goto-char (car decl-limits))
+         (push-mark (cdr decl-limits) nil t))))))
 (defun c-cpp-define-name ()
   "Return the name of the current CPP macro, or NIL if we're not in one."

> -- 
> Dani Moncayo

Alan Mackenzie (Nuremberg, Germany).

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