config: add config_from_gitmodules

diff --git a/builtin/diff-index.c b/builtin/diff-index.c
index f084826a293f96870d0cf6be05e3e346672fc5dc..185e6f9b582fdcf15072038b570463a0cfb1bbf2 100644 (file)
--- a/builtin/diff-index.c
+++ b/builtin/diff-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "config.h"
 #include "diff.h"
 #include "commit.h"
 #include "revision.h"
@@ -17,6 +18,9 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
        int i;
        int result;
 
+       if (argc == 2 && !strcmp(argv[1], "-h"))
+               usage(diff_cache_usage);
+
        git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        init_revisions(&rev, prefix);
        gitmodules_config();