Make c-mark-defun extend region when repeated, and leave a mark.

Fixes bugs #5525, #10906.

2 files changed, 31 insertions, 3 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index bc097448aeb..7673b1fc429 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2012-03-08  Alan Mackenzie  <acm@muc.de>
+
+        * progmodes/cc-cmds.el (c-mark-function): Make it leave a mark at
+        the starting position; make it extend the marked region when
+        invoked repeatedly - all under appropriate circumstances.
+        Fixes bugs #5525, #10906.
+
 2012-03-08  Glenn Morris  <rgm@gnu.org>
 
         * files.el (locate-dominating-file, dir-locals-find-file):
diff --git a/lisp/progmodes/cc-cmds.el b/lisp/progmodes/cc-cmds.el
index 509bb203f78..55ab6c9981c 100644
--- a/lisp/progmodes/cc-cmds.el
+++ b/lisp/progmodes/cc-cmds.el
@@ -1958,7 +1958,12 @@ with a brace block."
 
 (defun c-mark-function ()
   "Put mark at end of the current top-level declaration or macro, point at beginning.
-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."
@@ -1974,8 +1979,24 @@ function does not require the declaration to contain a brace block."
 
     (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
+              (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."