status: print stash info with --porcelain=v2 --show-stash

The v2 porcelain format is very convenient for obtaining a lot of
information about the current state of the repo, but does not contain
any info about the stash. git status already accepts --show-stash but
it's silently ignored when --porcelain=v2 is given.

Let's add a simple line to print the number of stash entries but in a
format similar in style to the rest of the format.

Signed-off-by: Øystein Walle <oystwa@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-status.txt

@@ -314,6 +314,14 @@ Line                                     Notes
 ------------------------------------------------------------
 ....
 
+Stash Information
+^^^^^^^^^^^^^^^^^
+
+If `--show-stash` is given, one line is printed showing the number of stash
+entries if non-zero:
+
+    # stash <N>
+
 Changed Tracked Entries
 ^^^^^^^^^^^^^^^^^^^^^^^
 

t/t7064-wtstatus-pv2.sh

@@ -113,6 +113,21 @@ test_expect_success 'after first commit, create unstaged changes' '
 	test_cmp expect actual
 '
 
+test_expect_success 'after first commit, stash existing changes' '
+	cat >expect <<-EOF &&
+	# branch.oid $H0
+	# branch.head initial-branch
+	# stash 2
+	EOF
+
+	test_when_finished "git stash pop && git stash pop" &&
+
+	git stash -- file_x &&
+	git stash &&
+	git status --porcelain=v2 --branch --show-stash --untracked-files=no >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'after first commit but omit untracked files and branch' '
 	cat >expect <<-EOF &&
 	1 .M N... 100644 100644 100644 $OID_X $OID_X file_x

wt-status.c

@@ -2182,6 +2182,18 @@ static void wt_porcelain_v2_print_tracking(struct wt_status *s)
 	}
 }
 
+/*
+ * Print the stash count in a porcelain-friendly format
+ */
+static void wt_porcelain_v2_print_stash(struct wt_status *s)
+{
+	int stash_count = count_stash_entries();
+	char eol = s->null_termination ? '\0' : '\n';
+
+	if (stash_count > 0)
+		fprintf(s->fp, "# stash %d%c", stash_count, eol);
+}
+
 /*
  * Convert various submodule status values into a
  * fixed-length string of characters in the buffer provided.
@@ -2443,6 +2455,9 @@ static void wt_porcelain_v2_print(struct wt_status *s)
 	if (s->show_branch)
 		wt_porcelain_v2_print_tracking(s);
 
+	if (s->show_stash)
+		wt_porcelain_v2_print_stash(s);
+
 	for (i = 0; i < s->change.nr; i++) {
 		it = &(s->change.items[i]);
 		d = it->util;