mpv url resolver

url-resolver.lua

-- resolve_ytdl helper command: https://gist.github.com/jonniek/4a9d850d224bbd704b71f9ec882eeef6
-- copy it and add it to some path dir and update the below path to match
local resolver = '/usr/bin/resolve_ytdl'
local tmpfile = '/tmp/resolvedtitle'

local utils = require("mp.utils")
local processed_urls = {}
local resolved_urls = {}

mp.observe_property('playlist-count', "number", function()
  local length = mp.get_property_number('playlist-count', 0)
  if length < 2 then return end
  local i=0
  while i < length do
    local filename = mp.get_property('playlist/'..i..'/filename')
    if filename:match('^https?://') and not processed_urls[filename] then
      processed_urls[filename] = true
      utils.subprocess_detached({ args= {resolver, filename, tmpfile} })
    end
    i=i+1
  end
end)

mp.add_periodic_timer(1, function()
  local file, e = io.open(tmpfile, 'r')
  if file then
    for line in file:lines() do
      local url, title = line:match("^(https?://.-)%s(.+)$")
      if not resolved_urls[url] and url and title then
        resolved_urls[url] = true
        mp.commandv("script-message", "playlistmanager", "addurl", url, title)
      end
    end
    file:close()
  end
end)

mp.register_event('shutdown', function()
  os.remove(tmpfile)
end)