After blame has finished but before we produce any output, we coalesce
groups of lines that were adjacent in the original suspect (which may
have been split apart by lines in intermediate commits which went away).
However, this can cause incorrect output if the lines are not also
adjacent in the result. For instance, the case in t8003 has:
ABC
DEF
which becomes
ABC
SPLIT
DEF
Blaming only lines 1 and 3 in the result yields two blame groups (one
for each line) that were adjacent in the original. That's enough for us
to coalesce them into a single group, but that loses information: our
output routines assume they're adjacent in the result as well, and we
output:
<oid> 1) ABC
<oid> 2) SPLIT
This is nonsense for two reasons:
- we were asked about line 3, not line 2; we should not output the
SPLIT line at all
- commit <oid> did not touch the SPLIT line at all! We found the
correct blame for line 3, but the bug is actually in the output
stage, which is showing the wrong line number and content from the
final file.
We can fix this by only coalescing when both the suspect and result
lines are adjacent. That fixes this bug, but keeps coalescing in cases
where want it (e.g., the existing test in t8003 where SPLIT goes away,
and the lines really are adjacent in the result).
Reported-by: Nuthan Munaiah <nm6061@xxxxxxx>
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
blame.c | 1 +
t/t8003-blame-corner-cases.sh | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/blame.c b/blame.c
index 82fa16d658..1be1cd82a2 100644
--- a/blame.c
+++ b/blame.c
@@ -1184,6 +1184,7 @@ void blame_coalesce(struct blame_scoreboard *sb)
for (ent = sb->ent; ent && (next = ent->next); ent = next) {
if (ent->suspect == next->suspect &&
ent->s_lno + ent->num_lines == next->s_lno &&
+ ent->lno + ent->num_lines == next->lno &&
ent->ignored == next->ignored &&
ent->unblamable == next->unblamable) {
ent->num_lines += next->num_lines;
diff --git a/t/t8003-blame-corner-cases.sh b/t/t8003-blame-corner-cases.sh
index 7f39a84289..ba8013b002 100755
--- a/t/t8003-blame-corner-cases.sh
+++ b/t/t8003-blame-corner-cases.sh
@@ -310,4 +310,13 @@ test_expect_success 'blame coalesce' '
test_cmp expect actual
'
+test_expect_success 'blame does not coalesce non-adjacent result lines' '
+ cat >expect <<-EOF &&
+ $orig 1) ABC
+ $orig 3) DEF
+ EOF
+ git blame --no-abbrev -s -L1,1 -L3,3 $split giraffe >actual &&
+ test_cmp expect actual
+'
+
test_done
--
2.28.0.570.ge2c3ee08e4
