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diff: handle diffstat of rewritten binary files

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The logic in builtin_diffstat assumes that a
complete_rewrite pair should have its lines counted. This is
nonsensical for binary files and leads to confusing things
like:

  $ git diff --stat --summary HEAD^ HEAD
   foo.rand |  Bin 4096 -> 4096 bytes
   1 files changed, 0 insertions(+), 0 deletions(-)

  $ git diff --stat --summary -B HEAD^ HEAD
   foo.rand |   34 +++++++++++++++-------------------
   1 files changed, 15 insertions(+), 19 deletions(-)
   rewrite foo.rand (100%)

So let's reorder the function to handle binary files first
(which from diffstat's perspective look like complete
rewrites anyway), then rewrites, then actual diffstats.

There are two bonus prizes to this reorder:

  1. It gets rid of a now-superfluous goto.

  2. The binary case is at the top, which means we can
     further optimize it in the next patch.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2011-02-19 03:04:56 -05:00 committed by Junio C Hamano
parent e923eaeb90
commit ded0abc73c
2 changed files with 21 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
diff.c
View file

@ -1811,26 +1811,31 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
data->is_unmerged = 1;
return;
}
if (complete_rewrite) {
if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
data->is_binary = 1;
data->added = mf2.size;
data->deleted = mf1.size;
}
else if (complete_rewrite) {
diff_populate_filespec(one, 0);
diff_populate_filespec(two, 0);
data->deleted = count_lines(one->data, one->size);
data->added = count_lines(two->data, two->size);
goto free_and_return;
}
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
data->is_binary = 1;
data->added = mf2.size;
data->deleted = mf1.size;
} else {
else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
@ -1838,7 +1843,6 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
&xpp, &xecfg, &ecb);
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
}

7
t/t4031-diff-rewrite-binary.sh
View file

@ -44,6 +44,13 @@ test_expect_success 'rewrite diff can show binary patch' '
grep "GIT binary patch" diff
'
test_expect_success 'rewrite diff --stat shows binary changes' '
git diff -B --stat --summary >diff &&
grep "Bin" diff &&
grep "0 insertions.*0 deletions" diff &&
grep " rewrite file" diff
'
{
echo "#!$SHELL_PATH"
cat <<'EOF'