Enhance Load URL diagnostics with comprehensive logging

- Add [LOAD-URL] prefix to all handler logs for easy filtering
- Log each stage of URL processing: parse, validate, direct-load, pipeline
- Add close_menu diagnostic logging
- Create test_load_url.py script for manual testing
- Improve error messages and status feedback

This will make it much easier to diagnose why Load URL isn't working.

MPV/LUA/main.lua

@@ -2751,57 +2751,66 @@ mp.register_script_message('medios-start-helper', function()
 end)
 
 mp.register_script_message('medios-load-url-event', function(json)
-    _lua_log('Load URL event handler called with: ' .. tostring(json or ''))
+    _lua_log('[LOAD-URL] Event handler called with: ' .. tostring(json or 'nil'))
     local ok, event = pcall(utils.parse_json, json)
     if not ok or type(event) ~= 'table' then
-        _lua_log('Load URL: failed to parse JSON: ' .. tostring(json))
+        _lua_log('[LOAD-URL] Failed to parse JSON: ' .. tostring(json))
         mp.osd_message('Failed to parse URL', 2)
         if ensure_uosc_loaded() then
+            _lua_log('[LOAD-URL] Closing menu due to parse error')
             mp.commandv('script-message-to', 'uosc', 'close-menu', LOAD_URL_MENU_TYPE)
         end
         return
     end
+    _lua_log('[LOAD-URL] Parsed event: type=' .. tostring(event.type) .. ', query=' .. tostring(event.query))
     if event.type ~= 'search' then
-        _lua_log('Load URL: event type is ' .. tostring(event.type) .. ', expected search')
+        _lua_log('[LOAD-URL] Event type is not search: ' .. tostring(event.type))
         if ensure_uosc_loaded() then
+            _lua_log('[LOAD-URL] Closing menu due to type mismatch')
             mp.commandv('script-message-to', 'uosc', 'close-menu', LOAD_URL_MENU_TYPE)
         end
         return
     end
 
     local url = trim(tostring(event.query or ''))
+    _lua_log('[LOAD-URL] Trimmed URL: "' .. url .. '"')
     if url == '' then
+        _lua_log('[LOAD-URL] URL is empty')
         mp.osd_message('URL is empty', 2)
         if ensure_uosc_loaded() then
+            _lua_log('[LOAD-URL] Closing menu due to empty URL')
             mp.commandv('script-message-to', 'uosc', 'close-menu', LOAD_URL_MENU_TYPE)
         end
         return
     end
 
     mp.osd_message('Loading URL...', 1)
-    _lua_log('Load URL: ' .. url)
+    _lua_log('[LOAD-URL] Starting to load: ' .. url)
 
     local function close_menu()
-        _lua_log('Load URL: closing menu')
+        _lua_log('[LOAD-URL] Closing menu')
         if ensure_uosc_loaded() then
+            _lua_log('[LOAD-URL] Sending close-menu command to UOSC')
             mp.commandv('script-message-to', 'uosc', 'close-menu', LOAD_URL_MENU_TYPE)
+        else
+            _lua_log('[LOAD-URL] UOSC not loaded, cannot close menu')
         end
     end
 
     -- First, always try direct loadfile. This is the fastest path.
     local can_direct = _url_can_direct_load(url)
-    _lua_log('Load URL: can_direct_load=' .. tostring(can_direct))
+    _lua_log('[LOAD-URL] Checking if URL can be loaded directly: ' .. tostring(can_direct))
     
     if can_direct then
-        _lua_log('Load URL: attempting direct loadfile')
+        _lua_log('[LOAD-URL] Attempting direct loadfile')
         local ok_load = pcall(mp.commandv, 'loadfile', url, 'replace')
         if ok_load then
-            _lua_log('Load URL: direct loadfile succeeded')
+            _lua_log('[LOAD-URL] Direct loadfile command sent successfully')
             mp.osd_message('URL loaded', 2)
             close_menu()
             return
         else
-            _lua_log('Load URL: direct loadfile failed')
+            _lua_log('[LOAD-URL] Direct loadfile command failed')
             mp.osd_message('Load URL failed (direct)', 3)
             close_menu()
             return
@@ -2809,29 +2818,30 @@ mp.register_script_message('medios-load-url-event', function(json)
     end
 
     -- Complex streams (YouTube, DASH, etc.) need the pipeline helper.
-    _lua_log('Load URL: URL needs pipeline helper')
+    _lua_log('[LOAD-URL] URL requires pipeline helper for processing')
     ensure_mpv_ipc_server()
     local helper_ready = ensure_pipeline_helper_running()
-    _lua_log('Load URL: helper_ready=' .. tostring(helper_ready))
+    _lua_log('[LOAD-URL] Pipeline helper ready: ' .. tostring(helper_ready))
     
     if not helper_ready then
-        mp.osd_message('Pipeline helper not running (try right-click menu)', 3)
+        _lua_log('[LOAD-URL] Pipeline helper not available')
+        mp.osd_message('Pipeline helper not running (try menu again)', 3)
         close_menu()
         return
     end
 
     -- Use pipeline to download/prepare the URL
     local pipeline_cmd = '.mpv -url ' .. quote_pipeline_arg(url) .. ' -play'
-    _lua_log('Load URL: executing pipeline command: ' .. pipeline_cmd)
+    _lua_log('[LOAD-URL] Sending to pipeline: ' .. pipeline_cmd)
     M.run_pipeline(pipeline_cmd, nil, function(resp, err)
-        _lua_log('Load URL: pipeline callback fired. resp=' .. tostring(resp) .. ', err=' .. tostring(err))
+        _lua_log('[LOAD-URL] Pipeline callback received: resp=' .. tostring(resp) .. ', err=' .. tostring(err))
         if err then
-            _lua_log('Load URL: pipeline error: ' .. tostring(err))
+            _lua_log('[LOAD-URL] Pipeline error: ' .. tostring(err))
             mp.osd_message('Load URL failed: ' .. tostring(err), 3)
             close_menu()
             return
         end
-        _lua_log('Load URL: URL loaded successfully via pipeline')
+        _lua_log('[LOAD-URL] URL loaded successfully')
         mp.osd_message('URL loaded', 2)
         close_menu()
     end)