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diff: fix modified lines stats with --stat and --numstat

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Only skip diffstats when both oids are valid and identical. This check
was causing both false-positives (files included in diffstats with no
actual changes (0 lines modified) and false-negatives (showing 0 lines
modified in stats when files had actually changed).

Also replaced same_contents with may_differ to avoid confusion.

Signed-off-by: Thomas Guyot-Sionnest <tguyot@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Thomas Guyot-Sionnest
2020-09-24 03:41:41 -04:00
committed by Junio C Hamano
parent e1cfff6765
commit ff0c7fa8cb
2 changed files with 11 additions and 13 deletions
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12
diff.c
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@ -3663,7 +3663,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
{
mmfile_t mf1, mf2;
struct diffstat_file *data;
int same_contents;
int may_differ;
int complete_rewrite = 0;
if (!DIFF_PAIR_UNMERGED(p)) {
@ -3681,12 +3681,14 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
return;
}
same_contents = oideq(&one->oid, &two->oid);
/* saves some reads if true, not a guarantee of diff outcome */
may_differ = !(one->oid_valid && two->oid_valid &&
oideq(&one->oid, &two->oid));
if (diff_filespec_is_binary(o->repo, one) ||
diff_filespec_is_binary(o->repo, two)) {
data->is_binary = 1;
if (same_contents) {
if (!may_differ) {
data->added = 0;
data->deleted = 0;
} else {
@ -3702,7 +3704,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
data->added = count_lines(two->data, two->size);
}
else if (!same_contents) {
else if (may_differ) {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
@ -3727,7 +3729,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
diffstat->files[diffstat->nr - 1];
/*
* Omit diffstats of modified files where nothing changed.
* Even if !same_contents, this might be the case due to
* Even if may_differ, this might be the case due to
* ignoring whitespace changes, etc.
*
* But note that we special-case additions, deletions,