github/workflows: add lua linting

.github/workflows/lint.yml

@@ -27,3 +27,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: norio-nomura/[email protected]
+
+  lua-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: lunarmodules/luacheck@v1

.luacheckrc

@@ -0,0 +1,60 @@
+stds = {
+  mp = {
+    globals = {
+      "mp",
+      "mp.command",
+      "mp.commandv",
+      "mp.command_native",
+      "mp.command_native_async",
+      "mp.abort_async_command",
+      "mp.del_property",
+      "mp.get_property",
+      "mp.get_property_osd",
+      "mp.get_property_bool",
+      "mp.get_property_number",
+      "mp.get_property_native",
+      "mp.set_property",
+      "mp.set_property_bool",
+      "mp.set_property_number",
+      "mp.set_property_native",
+      "mp.get_time",
+      "mp.add_key_binding",
+      "mp.add_forced_key_binding",
+      "mp.remove_key_binding",
+      "mp.register_event",
+      "mp.unregister_event",
+      "mp.observe_property",
+      "mp.unobserve_property",
+      "mp.add_timeout",
+      "mp.add_periodic_timer",
+      "mp.get_opt",
+      "mp.get_script_name",
+      "mp.get_script_directory",
+      "mp.osd_message",
+      "mp.get_wakeup_pipe",
+      "mp.get_next_timeout",
+      "mp.dispatch_events",
+      "mp.register_idle",
+      "mp.unregister_idle",
+      "mp.enable_messages",
+      "mp.register_script_message",
+      "mp.unregister_script_message",
+      "mp.create_osd_overlay",
+      "mp.get_osd_size",
+      "mp.msg.fatal",
+      "mp.msg.error",
+      "mp.msg.warn",
+      "mp.msg.info",
+      "mp.msg.verbose",
+      "mp.msg.debug",
+      "mp.msg.trace",
+    }
+  }
+}
+
+std = "+mp"
+
+ignore = {
+    "111", -- setting non-standard global variable
+    "121", -- accessing undefined global variable
+}