(compilation-save-buffers-predicate): New custom variable.

(compile, recompile): Pass it to `save-some-buffers'.

2 files changed, 25 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ad2f6cf56ee..6cdaaf2255b 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2010-04-07  Sam Steingold  <sds@gnu.org>
+
+	* progmodes/compile.el (compilation-save-buffers-predicate): New
+	custom variable.
+	(compile, recompile): Pass it to `save-some-buffers'.
+
 2010-04-07  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* wid-edit.el (widget-choose): Move cursor to the second line of
diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 51e42809153..5fc4a5f99df 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -584,6 +584,21 @@ Otherwise, it saves all modified buffers without asking."
   :group 'compilation)
 
 ;;;###autoload
+(defcustom compilation-save-buffers-predicate nil
+  "The second argument (PRED) passed to `save-some-buffers' before compiling.
+E.g., one can set this to
+  (lambda ()
+    (string-prefix-p my-compilation-root (file-truename (buffer-file-name))))
+to limit saving to files located under `my-compilation-root'.
+Note, that, in general, `compilation-directory' cannot be used instead
+of `my-compilation-root' here."
+  :type '(choice
+          (const :tag "Default (save all file-visiting buffers)" nil)
+          (const :tag "Save all buffers" t)
+          function)
+  :group 'compilation)
+
+;;;###autoload
 (defcustom compilation-search-path '(nil)
   "List of directories to search for source files named in error messages.
 Elements should be directory names, not file names of directories.
@@ -1097,7 +1112,8 @@ to a function that generates a unique name."
     (consp current-prefix-arg)))
   (unless (equal command (eval compile-command))
     (setq compile-command command))
-  (save-some-buffers (not compilation-ask-about-save) nil)
+  (save-some-buffers (not compilation-ask-about-save)
+                     compilation-save-buffers-predicate)
   (setq-default compilation-directory default-directory)
   (compilation-start command comint))
 
@@ -1108,7 +1124,8 @@ If this is run in a Compilation mode buffer, re-use the arguments from the
 original use.  Otherwise, recompile using `compile-command'.
 If the optional argument `edit-command' is non-nil, the command can be edited."
   (interactive "P")
-  (save-some-buffers (not compilation-ask-about-save) nil)
+  (save-some-buffers (not compilation-ask-about-save)
+                     compilation-save-buffers-predicate)
   (let ((default-directory (or compilation-directory default-directory)))
     (when edit-command
       (setcar compilation-arguments