Add the --submodule option to the diff option family
[git/git.git] / diff.c
diff --git a/diff.c b/diff.c
index e1be189..6c63b87 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -13,6 +13,7 @@
 #include "utf8.h"
 #include "userdiff.h"
 #include "sigchain.h"
+#include "submodule.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -1453,6 +1454,17 @@ static void builtin_diff(const char *name_a,
        const char *a_prefix, *b_prefix;
        const char *textconv_one = NULL, *textconv_two = NULL;
 
+       if (DIFF_OPT_TST(o, 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 ? one->path : two->path,
+                               one->sha1, two->sha1,
+                               del, add, reset);
+               return;
+       }
+
        if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
                textconv_one = get_textconv(one);
                textconv_two = get_textconv(two);
@@ -2640,6 +2652,12 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
        else if (!strcmp(arg, "--ignore-submodules"))
                DIFF_OPT_SET(options, IGNORE_SUBMODULES);
+       else if (!strcmp(arg, "--submodule"))
+               DIFF_OPT_SET(options, SUBMODULE_LOG);
+       else if (!prefixcmp(arg, "--submodule=")) {
+               if (!strcmp(arg + 12, "log"))
+                       DIFF_OPT_SET(options, SUBMODULE_LOG);
+       }
 
        /* misc options */
        else if (!strcmp(arg, "-z"))