[PATCH] Trivial path optimization test

[fork0@t-online.de (Alex Riesen)]

Linus Torvalds, Fri, Jul 14, 2006 17:39:24 +0200:
> > > Btw, I'm actually surprised that my path simplification didn't filter out
> > > the "." and make it mean exactly the same as not giving a path at all. I
> > > thought I had done that earlier, but if you say "-- ." matters, then it
> > > obviously does..
> >
> > In this specific case where I have a whole bunch of commits which don't
> > actually change anything, it definitely does make a difference...
> 
> Yes, I'm looking at "get_pathspec()", and noting that it really isn't able
> to optimize away the ".".
> 
> It does turn it into an empty string (which is correct - git internally
> does _not_ ever understand the notion of "." as the current working
> directory), but it doesn't ever do the optimization of noticing that a
> pathspec that consists solely of an empty string is "equivalent" to an
> empty pathspec.
> 
> Which is exactly what you _want_ in this case, of course, but maybe we
> should add a test-case for that, so that we never do that trivial
> optimization by mistake.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

...
> Anybody want to write that as a test, verify it, and send Junio a patch?
>
>                Linus

So here it is.

 t/t6004-rev-list-path-optim.sh |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/t/t6004-rev-list-path-optim.sh b/t/t6004-rev-list-path-optim.sh
new file mode 100755
index 0000000..5182dbb
--- /dev/null
+++ b/t/t6004-rev-list-path-optim.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+test_description='git-rev-list trivial path optimization test'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+echo Hello > a &&
+git add a &&
+git commit -m "Initial commit" a
+'
+
+test_expect_success path-optimization '
+    commit=$(echo "Unchanged tree" | git-commit-tree "HEAD^{tree}" -p HEAD) &&
+    test $(git-rev-list $commit | wc -l) = 2 &&
+    test $(git-rev-list $commit -- . | wc -l) = 1
+'
+
+test_done
-- 
1.4.1.gb944