[PATCH 3/5] diff: acknowledge --submodule=short command-line option

[Ramkumar Ramachandra <artagnon@gmail.com>]

Currently, the diff code does not differentiate between an explicit
'--submodule=short' being passed, and no submodule option being passed
on the command line.  Making this differentiation will be important
when the command-line option can be used to override a
"diff.submoduleFormat" configuration variable introduced in the next
patch.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 diff.c |    4 +++-
 diff.h |   17 +++++++++--------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/diff.c b/diff.c
index 35d3f07..8ea40f9 100644
--- a/diff.c
+++ b/diff.c
@@ -3647,7 +3647,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	} else if (!strcmp(arg, "--submodule"))
 		DIFF_OPT_SET(options, SUBMODULE_LOG);
 	else if (!prefixcmp(arg, "--submodule=")) {
-		if (!strcmp(arg + 12, "log"))
+		if (!strcmp(arg + 12, "short"))
+			DIFF_OPT_SET(options, SUBMODULE_SHORT);
+		else if (!strcmp(arg + 12, "log"))
 			DIFF_OPT_SET(options, SUBMODULE_LOG);
 	}
 
diff --git a/diff.h b/diff.h
index a658f85..4115b49 100644
--- a/diff.h
+++ b/diff.h
@@ -77,14 +77,15 @@ 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)
-#define DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG (1 << 27)
-#define DIFF_OPT_DIRSTAT_BY_LINE     (1 << 28)
-#define DIFF_OPT_FUNCCONTEXT         (1 << 29)
-#define DIFF_OPT_PICKAXE_IGNORE_CASE (1 << 30)
+#define DIFF_OPT_SUBMODULE_SHORT     (1 << 23)
+#define DIFF_OPT_SUBMODULE_LOG       (1 << 24)
+#define DIFF_OPT_DIRTY_SUBMODULES    (1 << 25)
+#define DIFF_OPT_IGNORE_UNTRACKED_IN_SUBMODULES (1 << 26)
+#define DIFF_OPT_IGNORE_DIRTY_SUBMODULES (1 << 27)
+#define DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG (1 << 28)
+#define DIFF_OPT_DIRSTAT_BY_LINE     (1 << 29)
+#define DIFF_OPT_FUNCCONTEXT         (1 << 30)
+#define DIFF_OPT_PICKAXE_IGNORE_CASE (1 << 31)
 
 #define DIFF_OPT_TST(opts, flag)    ((opts)->flags & DIFF_OPT_##flag)
 #define DIFF_OPT_SET(opts, flag)    ((opts)->flags |= DIFF_OPT_##flag)
-- 
1.7.8.1.362.g5d6df.dirty