feat(users/Profpatsch/lyrics): integrate into an mpv extension

Slop it together! The mpv script is entirely generated by ChatGPT.

Whoooooooooo

Change-Id: Ic284d142c2f1fd6d407af6b3571db0e815604051
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12478
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/lyric/lyric-mpv-script.lua

@@ -0,0 +1,57 @@
+-- get_lrc_subtitles.lua
+
+-- Asynchronous callback function to handle the result of the 'get_subtitles' command
+function handle_subtitle_result(success, result)
+    if not success or result.status ~= 0 then
+        mp.msg.error("Failed to get subtitles")
+        mp.msg.error("Exit code: " .. tostring(result.exit_code))
+        if result.stderr then
+            mp.msg.error("Error: " .. result.stderr)
+        end
+        return
+    end
+
+    -- Extract the output from the external command
+    local subtitle_file = result.stdout:match("^%s*(.-)%s*$")  -- trim any extra whitespace
+
+    -- If no subtitle file was returned, stop
+    if not subtitle_file or subtitle_file == "" then
+        mp.msg.warn("No subtitle file found")
+        return
+    end
+
+    -- Load the subtitle file in MPV
+    mp.commandv("sub-add", subtitle_file)
+    mp.msg.info("Loaded subtitle file: " .. subtitle_file)
+end
+
+-- Function to load the LRC subtitle file
+function load_lrc_subtitles()
+    -- Retrieve metadata for the currently playing file
+    local artist = mp.get_property("metadata/by-key/artist")
+    local album = mp.get_property("metadata/by-key/album")
+    local title = mp.get_property("metadata/by-key/title")
+
+    -- If any metadata is missing, print a warning and stop
+    if not artist or not album or not title then
+        mp.msg.warn("Artist, album, or title metadata is missing")
+        return
+    end
+
+    -- Concatenate the metadata
+    local query = string.format("%s %s %s", artist, album, title)
+
+    -- Create the command array
+    local cmd = {"@get_subtitles_command@", query}
+
+    -- Run the external command asynchronously to get the subtitle file
+    mp.command_native_async({
+        name = "subprocess",
+        args = cmd,
+        capture_stdout = true,
+        capture_stderr = true
+    }, handle_subtitle_result)
+end
+
+-- Register the event that triggers when a file is loaded
+mp.register_event("file-loaded", load_lrc_subtitles)