Save buffers before running grep commands

* lisp/progmodes/grep.el (grep-ask-about-save): New variable (bug#96).
(grep, lgrep, rgrep): Use it (bug#96).

* doc/emacs/building.texi (Grep Searching): Document
`grep-save-buffers'.

* lisp/progmodes/grep.el (grep-save-buffers): Rename from
`grep-ask-about-save'.
(grep--save-buffers): New function.
(grep, lgrep, rgrep): Use it.

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/emacs/building.texi b/doc/emacs/building.texi
index 3fa89d9062d..03fa0ed83b2 100644
--- a/doc/emacs/building.texi
+++ b/doc/emacs/building.texi
@@ -382,6 +382,14 @@ use of this feature by setting @code{grep-highlight-matches} to
 @code{t}.  When displaying a match in the source buffer, the exact
 match will be highlighted, instead of the entire source line.
 
+  The @command{grep} commands will offer to save buffers before
+running.  This is controlled by the @code{grep-save-buffers} variable.
+The possible values are either @code{nil} (don't save), @code{ask}
+(ask before saving), a function which will be used as a predicate (and
+is called with the file name as the parameter and should return
+non-nil if the buffer is to be saved), and any other non-@code{nil}
+value means that all buffers should be saved without asking.
+
 @findex grep-find
 @findex find-grep
   The command @kbd{M-x grep-find} (also available as @kbd{M-x