Remote control for MPV (mpv_remote.sh [play|pause|...] [all])

mpv_remote.sh

#!/bin/sh

# License: CC0 <https://creativecommons.org/choose/zero/>
# Author: elundmark@posteo.se
# Link: https://gist.github.com/elundmark/a7e491a1a3b26834972adeeb4962a955

# Using dbus and the mpv-mpris script:
# Targets either the frontmost player,
# or every instance of mpv (all),
# or one or more specific mpv processes by PID,
# separated by commas.
# Example: mpv_remote.sh play all

#########################################################
## This needs the mpv plugin mpv-mpris to be installed ##
##         https://github.com/hoyon/mpv-mpris          ##

helpText() {
	SCRIPT_NAME="$(basename "$0")"
	echo "Usage: \$ $SCRIPT_NAME COMMAND [all | PID[,PID]]"
	echo "Example:  $SCRIPT_NAME play all"
	echo "          $SCRIPT_NAME next"
	echo "          $SCRIPT_NAME pause 845"
	echo "          $SCRIPT_NAME pause 845,846"
	return 0
}

# exit conditions
if [ "$#" -eq 0 ] || [ "$#" -gt 2 ] \
	|| ! echo "$1" | grep -q -P -i '^(play|pause|toggle|playpause|p|n|next|skip|fwd|forward|prev|previous|back|stop)$' \
	|| ! echo "$2" | grep -q -P '^(all|[0-9,]+|$)$'
then
	helpText
	echo "Invalid argument" 1>&2
	exit 2
fi

# cache pids right away
MPV_PIDS="$(pgrep -x mpv)" || exit 1
if test -z "$MPV_PIDS" ; then
	echo "No mpv process found - exiting" 1>&2
	exit 1
fi

TARGET_ALL=0
TARGET_PIDS=''
if [ "$2"x = allx ] ; then
	TARGET_ALL=1
elif echo "$2" | grep -q -P '^[0-9,]+$'; then
	TARGET_PIDS="$2"
fi

CMD_STR='org.mpris.MediaPlayer2.Player.'
__DBUS_CMD='dbus-send --session --type=method_call --print-reply --dest=org.mpris.MediaPlayer2.mpv'
ACTION="$(echo "$1" | tr "[:upper:]" "[:lower:]")" # Play -> play

case "$ACTION" in
	play)		CMD_STR="$CMD_STR"Play;;
	pause)		CMD_STR="$CMD_STR"Pause;;
	toggle)		CMD_STR="$CMD_STR"PlayPause;;
	playpause)	CMD_STR="$CMD_STR"PlayPause;;
	p)			CMD_STR="$CMD_STR"PlayPause;;
	n)			CMD_STR="$CMD_STR"Next;;
	next)		CMD_STR="$CMD_STR"Next;;
	skip)		CMD_STR="$CMD_STR"Next;;
	fwd)		CMD_STR="$CMD_STR"Next;;
	forward)	CMD_STR="$CMD_STR"Next;;
	prev)		CMD_STR="$CMD_STR"Previous;;
	previous)	CMD_STR="$CMD_STR"Previous;;
	back)		CMD_STR="$CMD_STR"Previous;;
	stop)		CMD_STR="$CMD_STR"Stop;;
	*)			exit 99;;
esac

if test -n "$TARGET_PIDS" ; then
	echo "$TARGET_PIDS" | grep -o -P '[0-9]+' | while read -r PID; do
		$__DBUS_CMD".instance""$PID" /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1 \
			|| $__DBUS_CMD /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1
	done
elif [ "$TARGET_ALL" -eq 1 ] ; then
	$__DBUS_CMD /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1&
	echo "$MPV_PIDS" | while read -r PID; do
		$__DBUS_CMD".instance""$PID" /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1&
	done
else
	if [ "$(echo "$MPV_PIDS" | wc -l)" -eq 1 ] ; then
		$__DBUS_CMD /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1&
	elif [ "$(echo "$MPV_PIDS" | wc -l)" -ge 2 ] ; then
		$__DBUS_CMD".instance""$(xdotool getwindowfocus getwindowpid)" /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1 \
			|| $__DBUS_CMD /org/mpris/MediaPlayer2 "$CMD_STR" > /dev/null 2>&1
	fi
fi