Martins Schmierzettel

#! /bin/bash

# mpdpipe
# Copyright (C) 2021 Martin Dosch 
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

ytdl=$(command -v yt-dlp)
if [[ -z "$ytdl" ]]
then
	ytdl=$(command -v youtube-dl)
	if [[ -z "$ytdl" ]]
	then
		echo "No youtube-dl found."
		exit
	fi
fi

mpc=$(command -v mpc)
if [[ -z "$mpc" ]]
then
	echo "No mpc found."
	exit
fi

get_song_url () {
	url=$("$ytdl" -qgf bestaudio "$1")
}

check_url () {
	regex='(https?|ftp|file)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]'
	if [[ ! $1 =~ $regex ]]
	then
		echo "$1 is not a valid URL."
		exit
	fi
}

show_help () {
	basename=$(command -v basename)
	if [[ -z "$basename" ]]
	then
		program="$0"
	else
		program=$($basename "$0")
	fi
	echo "Usage:"
	echo "$program url"
	echo "$program mpd_host url"
	exit
}

case $# in
	1)
		if [ "$1" = "help" ] || [ "$1" = "--help" ]
		then
			show_help
		fi
		if ! $mpc -q
		then
			echo "Couldn't connect to mpd."
			exit
		fi
		mpc_command="$mpc"
		input="$1"
		;;
	2)
		if ! $mpc -qh "$1"
		then
			echo "Couldn't connect to mpd at $1."
			exit
		fi
		mpc_command="$mpc -h $1"
		input="$2"
		;;
	*)
		echo "Invalid input."
		show_help
		;;
esac

check_url "$input"

$mpc_command clear
firstrun=1

for link in $("$ytdl" --flat-playlist --no-warnings -qg "$input")
do
	get_song_url "$link"
	if [ -n "$url" ]
	then
		$mpc_command add "$url"
		if [ $firstrun -eq 1 ]
		then
			$mpc_command play
			firstrun=0
		fi
	fi
done