ref-filter: move need_color_reset_at_eol into ref_format

Calling verify_ref_format() doesn't just confirm that the
format is sane; it actually sets some global variables that
will be used later when formatting the refs. These logically
should belong to the ref_format, which would make it
possible to use multiple formats within a single program
invocation.

Let's move one such flag into the ref_format struct. There
are still others that would need to be moved before it would
be safe to use multiple formats, but this commit gives a
blueprint for how that should look.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ref-filter.c

@@ -97,7 +97,6 @@ static struct used_atom {
 	} u;
 } *used_atom;
 static int used_atom_cnt, need_tagged, need_symref;
-static int need_color_reset_at_eol;
 
 static void color_atom_parser(struct used_atom *atom, const char *color_value)
 {
@@ -661,7 +660,7 @@ int verify_ref_format(struct ref_format *format)
 {
 	const char *cp, *sp;
 
-	need_color_reset_at_eol = 0;
+	format->need_color_reset_at_eol = 0;
 	for (cp = format->format; *cp && (sp = find_next(cp)); ) {
 		const char *color, *ep = strchr(sp, ')');
 		int at;
@@ -673,7 +672,7 @@ int verify_ref_format(struct ref_format *format)
 		cp = ep + 1;
 
 		if (skip_prefix(used_atom[at].name, "color:", &color))
-			need_color_reset_at_eol = !!strcmp(color, "reset");
+			format->need_color_reset_at_eol = !!strcmp(color, "reset");
 	}
 	return 0;
 }
@@ -2083,7 +2082,7 @@ void format_ref_array_item(struct ref_array_item *info,
 		sp = cp + strlen(cp);
 		append_literal(cp, sp, &state);
 	}
-	if (need_color_reset_at_eol) {
+	if (format->need_color_reset_at_eol) {
 		struct atom_value resetv;
 		resetv.s = GIT_COLOR_RESET;
 		append_atom(&resetv, &state);

ref-filter.h

@@ -79,6 +79,9 @@ struct ref_format {
 	 */
 	const char *format;
 	int quote_style;
+
+	/* Internal state to ref-filter */
+	int need_color_reset_at_eol;
 };
 
 #define REF_FORMAT_INIT { NULL, 0 }