diff-parseopt: convert --[no-]follow

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index 689dc116840cd85017817b9d2c78d5d1fec69f3f..ad813ea418a3a8f5bd9f572f2a3cc248c1ddd885 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -4986,6 +4986,21 @@ static int diff_opt_find_renames(const struct option *opt,
        return 0;
 }
 
+static int diff_opt_follow(const struct option *opt,
+                          const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_ARG(arg);
+       if (unset) {
+               options->flags.follow_renames = 0;
+               options->flags.default_follow_renames = 0;
+       } else {
+               options->flags.follow_renames = 1;
+       }
+       return 0;
+}
+
 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
                                             const struct option *opt,
                                             const char *arg, int unset)
@@ -5172,6 +5187,9 @@ static void prep_parse_options(struct diff_options *options)
                              0, PARSE_OPT_NONEG),
                OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
                         N_("use empty blobs as rename source")),
+               OPT_CALLBACK_F(0, "follow", options, NULL,
+                              N_("continue listing the history of a file beyond renames"),
+                              PARSE_OPT_NOARG, diff_opt_follow),
 
                OPT_GROUP(N_("Diff algorithm options")),
                OPT_BIT(0, "minimal", &options->xdl_opts,
@@ -5250,12 +5268,7 @@ int diff_opt_parse(struct diff_options *options,
                return ac;
 
        /* flags options */
-       if (!strcmp(arg, "--follow"))
-               options->flags.follow_renames = 1;
-       else if (!strcmp(arg, "--no-follow")) {
-               options->flags.follow_renames = 0;
-               options->flags.default_follow_renames = 0;
-       } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
+       if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
                int value = git_config_colorbool(NULL, arg);
                if (value < 0)
                        return error("option `color' expects \"always\", \"auto\", or \"never\"");