elvish_config/aliases/youtube-dl.elv

var cmd = $e:yt-dlp~
#var cmd = $e:youtube-dl~

fn -dl {|@argv|
  $cmd --no-check-certificate $@argv 
}

fn -audio {|@argv|
  -dl -x --audio-format best $@argv
}

edit:add-var youtube-dl~ {|@argv| -dl $@argv }
edit:add-var youtube-audio~ {|@argv| -audio $@argv }
edit:add-var yt-dl~ {|@argv| -dl $@argv }
edit:add-var yt-audio~ {|@argv| -audio $@argv }