Add branch-sort and repo.branch-sort options.

When set to "name", branches are sorted by name, which is the current
default. When set to "age", branches are sorted by the age of the
repository.

This feature was requested by Konstantin Ryabitsev for use on
kernel.org.

Proposed-by: Konstantin Ryabitsev <mricon@kernel.org>

cgit.c

@@ -84,7 +84,12 @@ static void repo_config(struct cgit_repo *repo, const char *name, const char *va
 		repo->enable_remote_branches = atoi(value);
 	else if (!strcmp(name, "enable-subject-links"))
 		repo->enable_subject_links = atoi(value);
-	else if (!strcmp(name, "commit-sort")) {
+	else if (!strcmp(name, "branch-sort")) {
+		if (!strcmp(value, "age"))
+			repo->branch_sort = 1;
+		if (!strcmp(value, "name"))
+			repo->branch_sort = 0;
+	} else if (!strcmp(name, "commit-sort")) {
 		if (!strcmp(value, "date"))
 			repo->commit_sort = 1;
 		if (!strcmp(value, "topo"))
@@ -271,6 +276,11 @@ static void config_cb(const char *name, const char *value)
 			ctx.cfg.commit_sort = 1;
 		if (!strcmp(value, "topo"))
 			ctx.cfg.commit_sort = 2;
+	} else if (!strcmp(name, "branch-sort")) {
+		if (!strcmp(value, "age"))
+			ctx.cfg.branch_sort = 1;
+		if (!strcmp(value, "name"))
+			ctx.cfg.branch_sort = 0;
 	} else if (!prefixcmp(name, "mimetype."))
 		add_mimetype(name + 9, value);
 	else if (!strcmp(name, "include"))
@@ -345,6 +355,8 @@ static void prepare_context(struct cgit_context *ctx)
 	ctx->cfg.cache_scanrc_ttl = 15;
 	ctx->cfg.cache_static_ttl = -1;
 	ctx->cfg.case_sensitive_sort = 1;
+	ctx->cfg.branch_sort = 0;
+	ctx->cfg.commit_sort = 0;
 	ctx->cfg.css = "/cgit.css";
 	ctx->cfg.logo = "/cgit.png";
 	ctx->cfg.local_time = 0;