status: add --long output format option

You can currently set the output format to --short or
--porcelain. There is no --long, because we default to it
already. However, you may want to override an alias that
uses "--short" to get back to the default.

This requires a little bit of refactoring, because currently
we use STATUS_FORMAT_LONG internally to mean the same as
"the user did not specify anything". By expanding the enum
to include STATUS_FORMAT_NONE, we can distinguish between
the implicit and explicit cases. This effects these
conditions:

  1. The user has asked for NUL termination. With NONE, we
     currently default to turning on the porcelain mode.
     With an explicit --long, we would in theory use NUL
     termination with the long mode, but it does not support
     it. So we can just complain and die.

  2. When an output format is given to "git commit", we
     default to "--dry-run". This behavior would now kick in
     when "--long" is given, too.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/commit.c b/builtin/commit.c
index a17a5df..1dd2ec5 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -112,10 +112,11 @@
 static struct strbuf message = STRBUF_INIT;
 
 static enum {
+	STATUS_FORMAT_NONE = 0,
 	STATUS_FORMAT_LONG,
 	STATUS_FORMAT_SHORT,
 	STATUS_FORMAT_PORCELAIN
-} status_format = STATUS_FORMAT_LONG;
+} status_format;
 
 static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 {
@@ -454,6 +455,7 @@
 	case STATUS_FORMAT_PORCELAIN:
 		wt_porcelain_print(s);
 		break;
+	case STATUS_FORMAT_NONE:
 	case STATUS_FORMAT_LONG:
 		wt_status_print(s);
 		break;
@@ -1058,9 +1060,13 @@
 	if (all && argc > 0)
 		die(_("Paths with -a does not make sense."));
 
-	if (s->null_termination && status_format == STATUS_FORMAT_LONG)
-		status_format = STATUS_FORMAT_PORCELAIN;
-	if (status_format != STATUS_FORMAT_LONG)
+	if (s->null_termination) {
+		if (status_format == STATUS_FORMAT_NONE)
+			status_format = STATUS_FORMAT_PORCELAIN;
+		else if (status_format == STATUS_FORMAT_LONG)
+			die(_("--long and -z are incompatible"));
+	}
+	if (status_format != STATUS_FORMAT_NONE)
 		dry_run = 1;
 
 	return argc;
@@ -1159,6 +1165,9 @@
 		OPT_SET_INT(0, "porcelain", &status_format,
 			    N_("machine-readable output"),
 			    STATUS_FORMAT_PORCELAIN),
+		OPT_SET_INT(0, "long", &status_format,
+			    N_("show status in long format (default)"),
+			    STATUS_FORMAT_LONG),
 		OPT_BOOLEAN('z', "null", &s.null_termination,
 			    N_("terminate entries with NUL")),
 		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
@@ -1186,8 +1195,12 @@
 			     builtin_status_usage, 0);
 	finalize_colopts(&s.colopts, -1);
 
-	if (s.null_termination && status_format == STATUS_FORMAT_LONG)
-		status_format = STATUS_FORMAT_PORCELAIN;
+	if (s.null_termination) {
+		if (status_format == STATUS_FORMAT_NONE)
+			status_format = STATUS_FORMAT_PORCELAIN;
+		else if (status_format == STATUS_FORMAT_LONG)
+			die(_("--long and -z are incompatible"));
+	}
 
 	handle_untracked_files_arg(&s);
 	if (show_ignored_in_status)
@@ -1216,6 +1229,7 @@
 	case STATUS_FORMAT_PORCELAIN:
 		wt_porcelain_print(&s);
 		break;
+	case STATUS_FORMAT_NONE:
 	case STATUS_FORMAT_LONG:
 		s.verbose = verbose;
 		s.ignore_submodule_arg = ignore_submodule_arg;
@@ -1386,6 +1400,9 @@
 		OPT_BOOLEAN(0, "branch", &s.show_branch, N_("show branch information")),
 		OPT_SET_INT(0, "porcelain", &status_format,
 			    N_("machine-readable output"), STATUS_FORMAT_PORCELAIN),
+		OPT_SET_INT(0, "long", &status_format,
+			    N_("show status in long format (default)"),
+			    STATUS_FORMAT_LONG),
 		OPT_BOOLEAN('z', "null", &s.null_termination,
 			    N_("terminate entries with NUL")),
 		OPT_BOOLEAN(0, "amend", &amend, N_("amend previous commit")),