[PATCH v3 03/11] add -p (built-in): imitate `xdl_format_hunk_hdr()` generating hunk headers

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From: Johannes Schindelin <johannes.schindelin@xxxxxx>

In libxdiff, imitating GNU diff, the hunk headers only show the line
count if it is different from 1. When splitting hunks, the Perl version
of `git add -p` already imitates this. Let's do the same in the built-in
version of said command.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 add-patch.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/add-patch.c b/add-patch.c
index be4cf6e9e5..b6d53229bb 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -661,9 +661,14 @@ static void render_hunk(struct add_p_state *s, struct hunk *hunk,
 		else
 			new_offset += delta;
 
-		strbuf_addf(out, "@@ -%lu,%lu +%lu,%lu @@",
-			    old_offset, header->old_count,
-			    new_offset, header->new_count);
+		strbuf_addf(out, "@@ -%lu", old_offset);
+		if (header->old_count != 1)
+			strbuf_addf(out, ",%lu", header->old_count);
+		strbuf_addf(out, " +%lu", new_offset);
+		if (header->new_count != 1)
+			strbuf_addf(out, ",%lu", header->new_count);
+		strbuf_addstr(out, " @@");
+
 		if (len)
 			strbuf_add(out, p, len);
 		else if (colored)
-- 
gitgitgadget




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