[PATCH v2 08/18] branch-diff: suppress the diff headers

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When showing the diff between corresponding patches of the two branch
versions, we have to make up a fake filename to run the diff machinery.

That filename does not carry any meaningful information, hence tbdiff
suppresses it. So we should, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 builtin/branch-diff.c | 1 +
 diff.c                | 5 ++++-
 diff.h                | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/builtin/branch-diff.c b/builtin/branch-diff.c
index 4fc9fd74531..ed520d6229d 100644
--- a/builtin/branch-diff.c
+++ b/builtin/branch-diff.c
@@ -377,6 +377,7 @@ int cmd_branch_diff(int argc, const char **argv, const char *prefix)
 
 	diff_setup(&diffopt);
 	diffopt.output_format = DIFF_FORMAT_PATCH;
+	diffopt.flags.suppress_diff_headers = 1;
 	diffopt.output_prefix = output_prefix_cb;
 	strbuf_addstr(&four_spaces, "    ");
 	diffopt.output_prefix_data = &four_spaces;
diff --git a/diff.c b/diff.c
index 1289df4b1f9..f1bda0db3f5 100644
--- a/diff.c
+++ b/diff.c
@@ -3197,13 +3197,16 @@ static void builtin_diff(const char *name_a,
 		memset(&xpp, 0, sizeof(xpp));
 		memset(&xecfg, 0, sizeof(xecfg));
 		memset(&ecbdata, 0, sizeof(ecbdata));
+		if (o->flags.suppress_diff_headers)
+			lbl[0] = NULL;
 		ecbdata.label_path = lbl;
 		ecbdata.color_diff = want_color(o->use_color);
 		ecbdata.ws_rule = whitespace_rule(name_b);
 		if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
 			check_blank_at_eof(&mf1, &mf2, &ecbdata);
 		ecbdata.opt = o;
-		ecbdata.header = header.len ? &header : NULL;
+		if (header.len && !o->flags.suppress_diff_headers)
+			ecbdata.header = &header;
 		xpp.flags = o->xdl_opts;
 		xpp.anchors = o->anchors;
 		xpp.anchors_nr = o->anchors_nr;
diff --git a/diff.h b/diff.h
index d29560f822c..0dd6a71af60 100644
--- a/diff.h
+++ b/diff.h
@@ -94,6 +94,7 @@ struct diff_flags {
 	unsigned funccontext:1;
 	unsigned default_follow_renames:1;
 	unsigned stat_with_summary:1;
+	unsigned suppress_diff_headers:1;
 };
 
 static inline void diff_flags_or(struct diff_flags *a,
-- 
2.17.0.409.g71698f11835





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