Enhancements

Fix ruleset types other than Surge Ruleset not correctly expanded to rules.
Fix trying to limit upload file size.
Fix when no GEOIP rule is added, the Clash Script will not be able to generate.
Add "mixed" target to generate subscriptions with all types of standard subscriptions.
Add passing X-User-Agent and X-Client-IP header to subscription downloader.
Optimize codes.

src/templates.cpp

@@ -190,7 +190,7 @@ const std::string clash_script_template = R"(def main(ctx, md):
 {% if not rule.keyword == "" %}{% include "keyword_template" %}{% endif %}
 {% endfor %}
 
-  geoips = { {{ geoips }} }
+{% if exists("geoips") %}  geoips = { {{ geoips }} }
   ip = md.dst_ip
   if ip == "":
     ip = ctx.resolve_ip(md.host)
@@ -199,7 +199,7 @@ const std::string clash_script_template = R"(def main(ctx, md):
       return "{{ match_group }}"
   for key in geoips:
     if ctx.geoip(ip) == key:
-      return geoips[key]
+      return geoips[key]{% endif %}
   return "{{ match_group }}")";
 
 const std::string clash_script_group_template = R"({% if rule.has_domain == "false" and rule.has_ipcidr == "false" %}  if ctx.rule_providers["{{ rule.name }}_classical"].match(md):
@@ -414,7 +414,9 @@ int renderClashScript(YAML::Node &base_rule, std::vector<ruleset_content> &rules
     }
     if(script)
     {
-        parse_json_pointer(data, "geoips", geoips.erase(geoips.size() - 1));
+        if(geoips.size())
+            parse_json_pointer(data, "geoips", geoips.erase(geoips.size() - 1));
+
         parse_json_pointer(data, "match_group", match_group);
 
         inja::Environment env;