add-patch: quit on EOF

If we reach the end of the input, e.g. because the user pressed ctrl-D
on Linux, there is no point in showing any more prompts, as we won't get
any reply.  Do the same as option 'q' would: Quit.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: rscharfe

add-patch.c

@@ -1569,8 +1569,10 @@ static int patch_update_file(struct add_p_state *s,
 		if (*s->s.reset_color_interactive)
 			fputs(s->s.reset_color_interactive, stdout);
 		fflush(stdout);
-		if (read_single_character(s) == EOF)
+		if (read_single_character(s) == EOF) {
+			quit = 1;
 			break;
+		}
 
 		if (!s->answer.len)
 			continue;

t/t3701-add-interactive.sh

@@ -1431,4 +1431,15 @@ test_expect_success 'invalid option s is rejected' '
 	test_cmp expect actual
 '
 
+test_expect_success 'EOF quits' '
+	echo a >file &&
+	echo a >file2 &&
+	git add file file2 &&
+	echo X >file &&
+	echo X >file2 &&
+	git add -p </dev/null >out &&
+	test_grep file out &&
+	test_grep ! file2 out
+'
+
 test_done