ytfifo.rb

#!/usr/bin/env ruby

# this scripts acts as a wrapper for a little daemon that reads a fifo;
#
# If called without allready running it starts a background daemon and
# downloads the argument, then proceeds to watch the fifo for more.
#
# We esnure that the script is only running once and only one dl at a time.

FIFO =               "/home/ha/.ytfifo"

# SCRIPT_AUDIO =       "yt-dlp -P /home/media/audiobooks/Incoming --extract-audio --audio-format mp3 --audio-quality 0"
# SCRIPT_VIDEO =       "yt-dlp -P /home/media/movie/Incoming"

SCRIPT_AUDIO =       "/home/mit/bin/ytaudiodl"
SCRIPT_VIDEO =       "/home/mit/bin/ytdl"

LOGFILE =            "/home/ha/log/fifo.log"

unless File.exist?(FIFO)
  File.mkfifo(FIFO)
end

Process.setproctitle("ytfifo")

first_file = nil
scmd = ARGV.join


if `pgrep -f ytfifo`.split("\n").size > 1
  puts "daemon seems to be awake"
  if ARGV.size > 0
    puts "sending argument '#{scmd}'"
    File.open(FIFO, "w+"){ |fp| fp.puts(scmd) }
  end
  exit
else
  $stderr.puts "not running; casting daemon"  
  Process.daemon
  first_file = scmd
end


def dl(what)
  what.strip!
  puts "DL: #{what}"
  if not what or not what =~ /youtu\.?be/ or not what =~ /https/
    puts "skip: #{what}"
    return
  end

  # prepend V for video download - default
  what = "V---#{what}" if what.scan(/---/).size == 0

  script =
    if what.split("---").first == "V"
      SCRIPT_VIDEO
    else
      SCRIPT_AUDIO
    end
  what = what.split("---").last

  cmd = "echo -e \"ytfifo.rb DL($(date)) #{what}\" >> #{LOGFILE} && #{script} #{what} >> #{LOGFILE} 2>&1"
  puts "running: #{cmd}"
  `#{cmd}`
end

fifo = File.open(FIFO, 'r+')

$stdout.sync = true

loop do
  sleep 1
  line = first_file || fifo.gets
  first_file = nil
  next if not line or line.empty?
  puts dl(line)
end

fifo.close