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[PATCH v2] line-log: suppress diff output with "-s"




When "-L" is in use, we ignore any diff output format that the user
provides to us, and just always print a patch (with extra context lines
covering the whole area of interest). It's not entirely clear what we
should do with all formats (e.g., should "--stat" show just the diffstat
of the touched lines, or the stat for the whole file?).

But "-s" is pretty clear: the user probably wants to see just the
commits that touched those lines, without any diff at all. Let's at
least make that work.

Signed-off-by: Jeff King <peff@xxxxxxxx>
---
This is a repost from the thread at:

  https://public-inbox.org/git/CAEkQehdFu5zM4AY3ihN0pn1aCNEomY0WV07pryfAB45JN-tDDA@xxxxxxxxxxxxxx/

 line-log.c          | 6 ++++--
 t/t4211-line-log.sh | 7 +++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/line-log.c b/line-log.c
index 24e21731c4..59248e37cc 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1103,10 +1103,12 @@ static int process_all_files(struct line_log_data **range_out,
 
 int line_log_print(struct rev_info *rev, struct commit *commit)
 {
-	struct line_log_data *range = lookup_line_range(rev, commit);
 
 	show_log(rev);
-	dump_diff_hacky(rev, range);
+	if (!(rev->diffopt.output_format & DIFF_FORMAT_NO_OUTPUT)) {
+		struct line_log_data *range = lookup_line_range(rev, commit);
+		dump_diff_hacky(rev, range);
+	}
 	return 1;
 }
 
diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index bd5fe4d148..c9f2036f68 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -115,4 +115,11 @@ test_expect_success 'range_set_union' '
 	git log $(for x in $(test_seq 200); do echo -L $((2*x)),+1:c.c; done)
 '
 
+test_expect_success '-s shows only line-log commits' '
+	git log --format="commit %s" -L1,24:b.c >expect.raw &&
+	grep ^commit expect.raw >expect &&
+	git log --format="commit %s" -L1,24:b.c -s >actual &&
+	test_cmp expect actual
+'
+
 test_done
-- 
2.21.0.787.g929e938557