Hi,
Yoshioka Tsuneo <yoshiokatsuneo@xxxxxxxxx> writes:
> "git diff -M --stat" can detect rename and show renamed file name like
> "foofoofoo => barbarbar", but if destination filename is long the line
> is shortened like "...barbarbar" so there is no way to know whether the
> file is renamed or existed in the source commit.
Thanks for your patch! I think this is indeed something that should be
fixed.
Can you explain the algorithm chosen in the commit message or a block
comment in the code? I find it much easier to follow large code blocks
(like the one you added) with a prior notion of what it tries to do.
[As an aside, Documentation/SubmittingPatches says
The body should provide a meaningful commit message, which:
. explains the problem the change tries to solve, iow, what is wrong
with the current code without the change.
. justifies the way the change solves the problem, iow, why the
result with the change is better.
. alternate solutions considered but discarded, if any.
Observe that you explained the first item very well, but not the
others.]
> This commit makes it visible like "...foo => ...bar".
Also, you should rewrite this to be in the imperative mood:
Make sure there is always an arrow, e.g., "...foo => ...bar".
or some such.
[Again from SubmittingPatches:
Describe your changes in imperative mood, e.g. "make xyzzy do frotz"
instead of "[This patch] makes xyzzy do frotz" or "[I] changed xyzzy
to do frotz", as if you are giving orders to the codebase to change
its behaviour.]
> Signed-off-by: Tsuneo Yoshioka <yoshiokatsuneo@xxxxxxxxx>
> ---
> diff.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 51 insertions(+), 7 deletions(-)
Can you add a test? Perhaps like the one below. (You can squash it
into your commit if you like it.)
Note that in the test, the generated line looks like this:
{..._does_not_fit_in_a_single_line => .../path1 | 0
I don't want to go all bikesheddey, but I think it's somewhat
unfortunate that the elided parts do not correspond to each other. In
particular, I think the closing brace should not be omitted. Perhaps
something like this would be ideal (making it up on the spot, don't
count characters):
{...a_single_line => ..._as_the_first}/path1 | 0
diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index 2f327b7..03d6371 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
@@ -156,4 +156,16 @@ test_expect_success 'rename pretty print common prefix and suffix overlap' '
test_i18ngrep " d/f/{ => f}/e " output
'
+test_expect_success 'rename of very long path shows =>' '
+ mkdir long_dirname_that_does_not_fit_in_a_single_line &&
+ mkdir another_extremely_long_path_but_not_the_same_as_the_first &&
+ cp path1 long_dirname*/ &&
+ git add long_dirname*/path1 &&
+ test_commit add_long_pathname &&
+ git mv long_dirname*/path1 another_extremely_*/ &&
+ test_commit move_long_pathname &&
+ git diff -M --stat HEAD^ HEAD >output &&
+ test_i18ngrep "=>.*path1" output
+'
+
test_done
--
Thomas Rast
tr@xxxxxxxxxxxxx
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