From: Jacob Keller <jacob.kel...@gmail.com>

A future patch will add a new format for displaying the difference of
a submodule. Make it easier by changing how we store the current
selected format. Replace the DIFF_OPT flag with an enumeration, as each
format will be mutually exclusive.

Signed-off-by: Jacob Keller <jacob.kel...@gmail.com>
---
 diff.c | 12 ++++++------
 diff.h |  7 ++++++-
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/diff.c b/diff.c
index e57cf39ad109..d6b321da3d1d 100644
--- a/diff.c
+++ b/diff.c
@@ -132,9 +132,9 @@ static int parse_dirstat_params(struct diff_options 
*options, const char *params
 static int parse_submodule_params(struct diff_options *options, const char 
*value)
 {
        if (!strcmp(value, "log"))
-               DIFF_OPT_SET(options, SUBMODULE_LOG);
+               options->submodule_format = DIFF_SUBMODULE_LOG;
        else if (!strcmp(value, "short"))
-               DIFF_OPT_CLR(options, SUBMODULE_LOG);
+               options->submodule_format = DIFF_SUBMODULE_SHORT;
        else
                return -1;
        return 0;
@@ -2300,9 +2300,9 @@ static void builtin_diff(const char *name_a,
        struct strbuf header = STRBUF_INIT;
        const char *line_prefix = diff_line_prefix(o);
 
-       if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
-                       (!one->mode || S_ISGITLINK(one->mode)) &&
-                       (!two->mode || S_ISGITLINK(two->mode))) {
+       if (o->submodule_format == DIFF_SUBMODULE_LOG &&
+           (!one->mode || S_ISGITLINK(one->mode)) &&
+           (!two->mode || S_ISGITLINK(two->mode))) {
                const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
                const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
                show_submodule_summary(o->file, one->path ? one->path : 
two->path,
@@ -3916,7 +3916,7 @@ int diff_opt_parse(struct diff_options *options,
                DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
                handle_ignore_submodules_arg(options, arg);
        } else if (!strcmp(arg, "--submodule"))
-               DIFF_OPT_SET(options, SUBMODULE_LOG);
+               options->submodule_format = DIFF_SUBMODULE_LOG;
        else if (skip_prefix(arg, "--submodule=", &arg))
                return parse_submodule_opt(options, arg);
        else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
diff --git a/diff.h b/diff.h
index 1f57aad25c71..43b353aea091 100644
--- a/diff.h
+++ b/diff.h
@@ -83,7 +83,6 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct 
diff_options *opt, void *data)
 #define DIFF_OPT_DIRSTAT_BY_FILE     (1 << 20)
 #define DIFF_OPT_ALLOW_TEXTCONV      (1 << 21)
 #define DIFF_OPT_DIFF_FROM_CONTENTS  (1 << 22)
-#define DIFF_OPT_SUBMODULE_LOG       (1 << 23)
 #define DIFF_OPT_DIRTY_SUBMODULES    (1 << 24)
 #define DIFF_OPT_IGNORE_UNTRACKED_IN_SUBMODULES (1 << 25)
 #define DIFF_OPT_IGNORE_DIRTY_SUBMODULES (1 << 26)
@@ -110,6 +109,11 @@ enum diff_words_type {
        DIFF_WORDS_COLOR
 };
 
+enum diff_submodule_format {
+       DIFF_SUBMODULE_SHORT = 0,
+       DIFF_SUBMODULE_LOG
+};
+
 struct diff_options {
        const char *orderfile;
        const char *pickaxe;
@@ -157,6 +161,7 @@ struct diff_options {
        int stat_count;
        const char *word_regex;
        enum diff_words_type word_diff;
+       enum diff_submodule_format submodule_format;
 
        /* this is set by diffcore for DIFF_FORMAT_PATCH */
        int found_changes;
-- 
2.10.0.rc0.259.g83512d9

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