[PATCH v3 3/6] diff: allow --patch & cie to override -s/--no-patch

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All options that trigger a patch output now override --no-patch.

The case of --binary is particular as the name may suggest that it turns
a normal patch into a binary patch, but it actually already enables patch
output when normally disabled (e.g. "git log --binary" displays a patch),
hence it makes sense that "git show --no-patch --binary" display the
binary patch.

Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxx>
---
 diff.c                 | 28 +++++++++++++++++-----------
 t/t4000-diff-format.sh |  5 +++++
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/diff.c b/diff.c
index 6bd821d..66ab714 100644
--- a/diff.c
+++ b/diff.c
@@ -3508,6 +3508,11 @@ static int parse_submodule_opt(struct diff_options *options, const char *value)
 	return 1;
 }
 
+static void enable_patch_output(int *fmt) {
+	*fmt &= ~DIFF_FORMAT_NO_OUTPUT;
+	*fmt |= DIFF_FORMAT_PATCH;
+}
+
 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 {
 	const char *arg = av[0];
@@ -3515,15 +3520,15 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	int argcount;
 
 	/* Output format options */
-	if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
-		options->output_format |= DIFF_FORMAT_PATCH;
-	else if (opt_arg(arg, 'U', "unified", &options->context))
-		options->output_format |= DIFF_FORMAT_PATCH;
+	if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
+	    || opt_arg(arg, 'U', "unified", &options->context))
+		enable_patch_output(&options->output_format);
 	else if (!strcmp(arg, "--raw"))
 		options->output_format |= DIFF_FORMAT_RAW;
-	else if (!strcmp(arg, "--patch-with-raw"))
-		options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
-	else if (!strcmp(arg, "--numstat"))
+	else if (!strcmp(arg, "--patch-with-raw")) {
+		enable_patch_output(&options->output_format);
+		options->output_format |= DIFF_FORMAT_RAW;
+	} else if (!strcmp(arg, "--numstat"))
 		options->output_format |= DIFF_FORMAT_NUMSTAT;
 	else if (!strcmp(arg, "--shortstat"))
 		options->output_format |= DIFF_FORMAT_SHORTSTAT;
@@ -3545,9 +3550,10 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		options->output_format |= DIFF_FORMAT_CHECKDIFF;
 	else if (!strcmp(arg, "--summary"))
 		options->output_format |= DIFF_FORMAT_SUMMARY;
-	else if (!strcmp(arg, "--patch-with-stat"))
-		options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
-	else if (!strcmp(arg, "--name-only"))
+	else if (!strcmp(arg, "--patch-with-stat")) {
+		enable_patch_output(&options->output_format);
+		options->output_format |= DIFF_FORMAT_DIFFSTAT;
+	} else if (!strcmp(arg, "--name-only"))
 		options->output_format |= DIFF_FORMAT_NAME;
 	else if (!strcmp(arg, "--name-status"))
 		options->output_format |= DIFF_FORMAT_NAME_STATUS;
@@ -3624,7 +3630,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 
 	/* flags options */
 	else if (!strcmp(arg, "--binary")) {
-		options->output_format |= DIFF_FORMAT_PATCH;
+		enable_patch_output(&options->output_format);
 		DIFF_OPT_SET(options, BINARY);
 	}
 	else if (!strcmp(arg, "--full-index"))
diff --git a/t/t4000-diff-format.sh b/t/t4000-diff-format.sh
index d702575..4fce12f 100755
--- a/t/t4000-diff-format.sh
+++ b/t/t4000-diff-format.sh
@@ -71,4 +71,9 @@ test_expect_success 'git diff-files --no-patch as synonym for -s' '
 	test_must_be_empty err
 '
 
+test_expect_success 'git diff-files --no-patch --patch shows the patch' '
+	git diff-files --no-patch --patch >diff-np-output 2>err &&
+	compare_diff_patch expected actual
+'
+
 test_done
-- 
1.8.3.1.495.g13f33cf.dirty

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