Merge branch 'sb/diff-orderfile-config'

Allow "git diff -O<file>" to be configured with a new configuration
variable.

* sb/diff-orderfile-config:
  diff: add diff.orderfile configuration variable
  diff: let "git diff -O" read orderfile from any file and fail properly
  t4056: add new tests for "git diff -O"

1 files changed, 5 insertions, 0 deletions

diff --git a/diff.c b/diff.c
index f99bc83b73..6b4cd0eb36 100644
--- a/diff.c
+++ b/diff.c
@@ -30,6 +30,7 @@ static int diff_use_color_default = -1;
 static int diff_context_default = 3;
 static const char *diff_word_regex_cfg;
 static const char *external_diff_cmd_cfg;
+static const char *diff_order_file_cfg;
 int diff_auto_refresh_index = 1;
 static int diff_mnemonic_prefix;
 static int diff_no_prefix;
@@ -201,6 +202,8 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 		return git_config_string(&external_diff_cmd_cfg, var, value);
 	if (!strcmp(var, "diff.wordregex"))
 		return git_config_string(&diff_word_regex_cfg, var, value);
+	if (!strcmp(var, "diff.orderfile"))
+		return git_config_pathname(&diff_order_file_cfg, var, value);
 
 	if (!strcmp(var, "diff.ignoresubmodules"))
 		handle_ignore_submodules_arg(&default_diff_options, value);
@@ -3219,6 +3222,8 @@ void diff_setup(struct diff_options *options)
 	options->detect_rename = diff_detect_rename_default;
 	options->xdl_opts |= diff_algorithm;
 
+	options->orderfile = diff_order_file_cfg;
+
 	if (diff_no_prefix) {
 		options->a_prefix = options->b_prefix = "";
 	} else if (!diff_mnemonic_prefix) {