[RFC/PATCH 3/3] builtin/show.c: do not prune by pathspec

[Michael J Gruber <git@drmicha.warpmail.net>]

By design, "git show commit -- path" is not "git show commit:path", and
there is no reason to change that. But "git show commit -- path" simply
returns nothing at all "most of the time" because it prunes by pathspec
even though it does not walk commits. This is pretty useless.

So, turn off pruning (but keep diff limiting of course) so that "git
show commit -- path" shows the commit message and the diff that the
commit introduces to path (filtered by path); only the diff will be
empty "most of the time".

As an intended side effect, users mistaking "git show commit -- path"
for "git show commit:path" are automatically reminded that they asked
git to show a commit, not a blob.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
---
 builtin/log.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index 9db43ed..ea0ddb4 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -411,6 +411,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	opt.def = "HEAD";
 	opt.tweak = show_rev_tweak_rev;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
+	rev.prune = 0;
 
 	count = rev.pending.nr;
 	objects = rev.pending.objects;
-- 
1.7.4.2.668.gba03a4