script when placed in ~/.config/mpv/scripts rick rolls user every time they play a video

rickroll.lua

local intro_video_url = "https://www.youtube.com/watch?v=dQw4w9WgXcQ"
local has_prepended = false -- A flag to prevent repeated prepending

mp.register_event("file-loaded", function()
    -- Check if we've already prepended the URL
    if not has_prepended then
        -- Insert the YouTube video at the beginning of the playlist
        mp.commandv("loadfile", intro_video_url, "append-play")

        -- Wait for the video to be properly appended
        mp.add_timeout(1, function()
            local playlist_count = mp.get_property_number("playlist-count", 1)

            -- Move the newly added video to the front
            mp.command("playlist-move " .. (playlist_count - 1) .. " 0")

            -- Switch to the first playlist entry (the prepended YouTube URL)
            mp.set_property("playlist-pos", 0)

            -- Mark that the URL has been prepended to avoid repeating
            has_prepended = true
        end)
    end
end)