grep: set default output method

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

grep.c

@@ -12,6 +12,11 @@ static int grep_source_is_binary(struct grep_source *gs);
 
 static struct grep_opt grep_defaults;
 
+static void std_output(struct grep_opt *opt, const void *buf, size_t size)
+{
+	fwrite(buf, size, 1, stdout);
+}
+
 /*
  * Initialize the grep_defaults template with hardcoded defaults.
  * We could let the compiler do this, but without C99 initializers
@@ -42,6 +47,7 @@ void init_grep_defaults(void)
 	color_set(opt->color_selected, "");
 	color_set(opt->color_sep, GIT_COLOR_CYAN);
 	opt->color = -1;
+	opt->output = std_output;
 }
 
 static int parse_pattern_type_arg(const char *opt, const char *arg)
@@ -152,6 +158,7 @@ void grep_init(struct grep_opt *opt, const char *prefix)
 	opt->pathname = def->pathname;
 	opt->regflags = def->regflags;
 	opt->relative = def->relative;
+	opt->output = def->output;
 
 	color_set(opt->color_context, def->color_context);
 	color_set(opt->color_filename, def->color_filename);
@@ -1379,11 +1386,6 @@ static int look_ahead(struct grep_opt *opt,
 	return 0;
 }
 
-static void std_output(struct grep_opt *opt, const void *buf, size_t size)
-{
-	fwrite(buf, size, 1, stdout);
-}
-
 static int fill_textconv_grep(struct userdiff_driver *driver,
 			      struct grep_source *gs)
 {