run_external_diff: refactor cmdline setup logic
The current logic makes it hard to see what gets put onto
the command line in which cases. Pulling out a helper
function lets us see that we have two sets of file data, and
the second set either uses the original name, or the "other"
renamed/copy name.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
index a360ab5..680f52d 100644
--- a/diff.c
+++ b/diff.c
@@ -2892,6 +2892,16 @@
return temp;
}
+static void add_external_diff_name(struct argv_array *argv,
+ const char *name,
+ struct diff_filespec *df)
+{
+ struct diff_tempfile *temp = prepare_temp_file(name, df);
+ argv_array_push(argv, temp->name);
+ argv_array_push(argv, temp->hex);
+ argv_array_push(argv, temp->mode);
+}
+
/* An external diff command takes:
*
* diff-cmd name infile1 infile1-sha1 infile1-mode \
@@ -2915,17 +2925,11 @@
argv_array_push(&argv, name);
if (one && two) {
- struct diff_tempfile *temp_one, *temp_two;
- const char *othername = (other ? other : name);
- temp_one = prepare_temp_file(name, one);
- temp_two = prepare_temp_file(othername, two);
- argv_array_push(&argv, temp_one->name);
- argv_array_push(&argv, temp_one->hex);
- argv_array_push(&argv, temp_one->mode);
- argv_array_push(&argv, temp_two->name);
- argv_array_push(&argv, temp_two->hex);
- argv_array_push(&argv, temp_two->mode);
- if (other) {
+ add_external_diff_name(&argv, name, one);
+ if (!other)
+ add_external_diff_name(&argv, name, two);
+ else {
+ add_external_diff_name(&argv, other, two);
argv_array_push(&argv, other);
argv_array_push(&argv, xfrm_msg);
}
