diff-parseopt: convert --diff-algorithm

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 7432702fd88721366ffa8801720252196bf61f24..8d08795f9c51925e7e3d23e2b668de74b4b78490 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -4891,6 +4891,24 @@ static int diff_opt_compact_summary(const struct option *opt,
        return 0;
 }
 
+static int diff_opt_diff_algorithm(const struct option *opt,
+                                  const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       long value = parse_algorithm_value(arg);
+
+       BUG_ON_OPT_NEG(unset);
+       if (value < 0)
+               return error(_("option diff-algorithm accepts \"myers\", "
+                              "\"minimal\", \"patience\" and \"histogram\""));
+
+       /* clear out previous settings */
+       DIFF_XDL_CLR(options, NEED_MINIMAL);
+       options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
+       options->xdl_opts |= value;
+       return 0;
+}
+
 static int diff_opt_dirstat(const struct option *opt,
                            const char *arg, int unset)
 {
@@ -5154,6 +5172,9 @@ static void prep_parse_options(struct diff_options *options)
                OPT_BITOP(0, "histogram", &options->xdl_opts,
                          N_("generate diff using the \"histogram diff\" algorithm"),
                          XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
+               OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
+                              N_("choose a diff algorithm"),
+                              PARSE_OPT_NONEG, diff_opt_diff_algorithm),
 
                OPT_GROUP(N_("Diff other options")),
                OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
@@ -5192,17 +5213,7 @@ int diff_opt_parse(struct diff_options *options,
                return ac;
 
        /* xdiff options */
-       if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
-               long value = parse_algorithm_value(optarg);
-               if (value < 0)
-                       return error("option diff-algorithm accepts \"myers\", "
-                                    "\"minimal\", \"patience\" and \"histogram\"");
-               /* clear out previous settings */
-               DIFF_XDL_CLR(options, NEED_MINIMAL);
-               options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
-               options->xdl_opts |= value;
-               return argcount;
-       } else if (skip_prefix(arg, "--anchored=", &arg)) {
+       if (skip_prefix(arg, "--anchored=", &arg)) {
                options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
                ALLOC_GROW(options->anchors, options->anchors_nr + 1,
                           options->anchors_alloc);