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run_external_diff: refactor cmdline setup logic

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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>
This commit is contained in:
Jeff King 2014-04-19 15:22:25 -04:00 committed by Junio C Hamano
parent 0d4217d92e
commit f3efe78782
1 changed files with 15 additions and 11 deletions
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26
diff.c
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@ -2892,6 +2892,16 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
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 @@ static void run_external_diff(const char *pgm,
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);
}