builtin "git prune"

This actually removes the objects to be pruned, unless you specify "-n"
(at which point it will just tell you which files it would prune).

This doesn't do the pack-file pruning that the shell-script used to do,
but if somebody really wants to, they could add it easily enough. I wonder
how useful it is, though, considering that "git repack -a -d" is just a
lot more efficient and generates a better end result.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git.c

@@ -188,7 +188,8 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 		{ "stripspace", cmd_stripspace },
 		{ "update-index", cmd_update_index },
 		{ "update-ref", cmd_update_ref },
-		{ "fmt-merge-msg", cmd_fmt_merge_msg }
+		{ "fmt-merge-msg", cmd_fmt_merge_msg },
+		{ "prune", cmd_prune },
 	};
 	int i;