commit d2dfa2ecef800c3522c233c56c05b8a91f859fe0
from: Stefan Sperling <stsp@stsp.name>
date: Wed Oct 07 23:32:36 2020 UTC

fix unidiff output header in case both files have only one line

commit - ede9a86acbafeb41c2521bc32df592eb913a3f7e
commit + d2dfa2ecef800c3522c233c56c05b8a91f859fe0
blob - 715e8c6ecb06cac5859a9514a294598e33a63288
blob + 17ab051ba2a7971ebb60db4df55ab097121d070d
--- lib/diff_output_unidiff.c
+++ lib/diff_output_unidiff.c
@@ -199,7 +199,10 @@ output_unidiff_chunk(struct diff_output_info *outinfo,
 	else
 		right_start = cc->right.start + 1;
 
-	if (left_len == 1 && right_len != 1) {
+	if (left_len == 1 && right_len == 1) {
+		rc = fprintf(dest, "@@ -%d +%d @@\n",
+			left_start, right_start);
+	} else if (left_len == 1 && right_len != 1) {
 		rc = fprintf(dest, "@@ -%d +%d,%d @@\n",
 			left_start, right_start, right_len);
 	} else if (left_len != 1 && right_len == 1) {
blob - ac93bcd3ccf2615381907e61aa9e07d216224f59
blob + a6a06181d8406284c36762c8a2f9d252eab1f9db
--- test/expect007.diff
+++ test/expect007.diff
@@ -1,5 +1,5 @@
 --- test007.left.txt
 +++ test007.right.txt
-@@ -1,1 +1,1 @@
+@@ -1 +1 @@
 -x
 +abcdx