Re: [PATCH] Documentation/git-diff: remove -r from --name-status example

[Jeff King <peff@peff.net>]

On Sun, Jul 29, 2007 at 01:04:13PM +0100, Johannes Schindelin wrote:

> The idea is this: when "--quiet" was given, we do not output anything, and 
> therefore do not have to recurse into the directories, because we already 
> know that there are differences when a _tree_ is different.  I do not 
> remember all details of the "--quiet" implementation, but I think that it
> 
> - exits early (as you said)
> 
> - does not turn on "recursive" to avoid unnecessary work.

OK, looking through the code, this works _sometimes_. If I say "git-diff
--quiet" then it will not recurse. If I say "git-diff -p --quiet" then
it will (even though we never show the -p output).

Since --quiet supersedes all output formats, I think it probably should
just clear the recursive option entirely. In which case rather than
special-casing quiet to avoid recursion in git-diff, we can simply turn
on recursion before parsing options (and it will get turned off
correctly by any diff options that need to do so).

Something like:

diff --git a/builtin-diff.c b/builtin-diff.c
index 7f367b6..e6d10bd 100644
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -229,6 +229,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 		argc = setup_revisions(argc, argv, &rev, NULL);
 	if (!rev.diffopt.output_format) {
 		rev.diffopt.output_format = DIFF_FORMAT_PATCH;
+		rev.diffopt.recursive = 1;
 		if (diff_setup_done(&rev.diffopt) < 0)
 			die("diff_setup_done failed");
 	}
diff --git a/diff.c b/diff.c
index a5fc56b..aeae1a3 100644
--- a/diff.c
+++ b/diff.c
@@ -2182,6 +2182,7 @@ int diff_setup_done(struct diff_options *options)
 	if (options->quiet) {
 		options->output_format = DIFF_FORMAT_NO_OUTPUT;
 		options->exit_with_status = 1;
+		options->recursive = 0;
 	}
 
 	/*

But maybe that doesn't work because some of the options need recursion
turned on, even if --quiet is specified. I have to admit, there are a
lot of code paths here and I'm not sure how all of them interact with
the recursive option. So perhaps it is better to just special case
options->quiet as you suggested.

-Peff