MPD notififcations and VK status updates

mpdwatchd

#!/bin/bash


#### CONFIG ####
vk_token= # Oauth token with status scope
vk_prefix="✇"
notify_time=5000
MPD_HOST="/mpd/socket"
LCD_HOST="127.0.0.1"
LCD_PORT="13666"
################

mpd_playing=0
mpd_volume=100
mpd_title=""
lcd_enabled=0

log="/dev/null"

for pid in $(pidof -x `basename $0`); do
    if [ $pid != $$ ]; then
        echo "[$(date)] : mpdwatchd : Process is already running with PID $pid"
        exit 1
    fi
done



lcd_open() {
	if pidof -x "LCDd" >/dev/null; then
		lcd_enabled=1
		exec {LCD}<>"/dev/tcp/$LCD_HOST/$LCD_PORT"
		logger "LCDd connected"
		lcd_sendcmd hello
		lcd_sendcmd client_set name "mpdwatchd"
	fi
}

lcd_close() {
	if (( $lcd_enabled > 0 ))
	then
		logger "Closing LCD"
		exec {LCD}<&-
	fi
}

lcd_sendcmd() {
	if (( $lcd_enabled > 0 )) 
	then
		echo $@ >&${LCD}
		read lcdresponse <&${LCD}
	fi
}

lcd_update() {
	if (( $mpd_playing > 0 ))
	then
		if [ -z "$lcd_created" ];
		then
			logger "Creating lcd"
			lcd_sendcmd screen_add mpd
			lcd_sendcmd screen_set mpd name "NowPlayingWidget" duration -1
			lcd_sendcmd widget_add mpd top_line title
			lcd_sendcmd widget_add mpd bottom_line scroller
			lcd_created=1
		fi
		lcd_sendcmd widget_set mpd top_line "{Now playing}"
		lcd_sendcmd widget_set mpd bottom_line 1 2 20 2 h 2 "{$mpd_title}"
		
		# Topmost notifier
		lcd_sendcmd screen_add mpd_alert
		lcd_sendcmd screen_set mpd_alert priority alert name "MpdChangeAlert" timeout 40
		lcd_sendcmd widget_add mpd_alert top_line title
		lcd_sendcmd widget_add mpd_alert bottom_line scroller
		lcd_sendcmd widget_set mpd_alert top_line "{Now playing}"
		lcd_sendcmd widget_set mpd_alert bottom_line 1 2 20 2 h 2 "{$mpd_title}"
	else
		if [ -n "$lcd_created" ];
		then
			logger "Deleting lcd"
			lcd_sendcmd screen_del mpd
			unset lcd_created
		fi
	fi
}

logger() { 
	echo "$(date +'[ %d %b %Y %H:%M ]') :: $*" >> $log
}

update_mpd_status() {
		mpc status | grep "\[playing\]" >/dev/null
		mpd_notplaying=$?
		if (( $mpd_notplaying > 0 ))
		then
			mpd_playing=0
		else
			mpd_playing=1
		fi
		
		if (( $mpd_playing > 0 ))
		then
			mpd_volume=$(mpc volume | grep  -Po 'volume:(\d+)%' | tail -c +8 | head -c 3)
			mpd_title=$(mpc | head -n 1)
		else
			mpd_volume=0
			mpd_title=""
		fi
}



mpd_notify() {
	if ((mpd_playing))
	then
		notify-send --expire-time=$notify_time "Now Playing" "$mpd_title"
	fi
}

reset_vk_status() {
	if [ -n "$original_status" ];
	then
		logger "Restoring original status"
		new_status=$(vkapi $vk_token status.get | jq ".response.text")
		status_suffix=$(echo "$new_status" | sed -E "s/^\".+(\|.+\|.+\|.+)\"/\1/")
		vkapi $vk_token status.set text "$original_status$status_suffix" > /dev/null
		unset original_status
	fi
}

atexit() {
	logger "Exiting..."
	reset_vk_status
	lcd_close
	exit 0
}
trap atexit EXIT
trap atexit INT
trap atexit KILL

vk_status() {
	if ((mpd_playing))
	then
		status=$(vkapi $vk_token status.get | jq ".response.text")
		status_suffix=$(echo "$status" | sed -E "s/^\".+(\|.+\|.+\|.+)\"/\1/")
		if [ -z "$original_status" ];
		then
			logger "Saving original status"
			original_status=$(echo "$status" | sed -E "s/^\"(.+)\|.+\|.+\|.+\"/\1/")
		fi
		vkapi $vk_token status.set text "$vk_prefix $mpd_title $status_suffix" > /dev/null
	else
		reset_vk_status
	fi
}

show_status() {
	echo "Playing: " $mpd_playing
	echo "Vol: " $mpd_volume
	echo "Title: " $mpd_title
}

await_mpd_event() {
	event=$(mpc idle player)
	logger "Got event $event"
}

write_tmp_file () {
	echo "$mpd_title" > /tmp/mpdwatchd.current
}

lcd_open
while true
do
	await_mpd_event
	update_mpd_status
	mpd_notify
	vk_status
	write_tmp_file
	lcd_update
done

vkapi

#!/bin/bash

method=$2
token=$1
shift
shift

extra_args=""

while test ${#} -gt 0
do
	esc_arg=$2
	#esc_arg=${esc_arg// /%20}
	extra_args="$extra_args --data-urlencode \"$1=$esc_arg\""
	shift
	shift
done



eval curl -s -G --data-urlencode "access_token=$token" --data-urlencode "v=5.1" "$extra_args" "https://api.vk.com/method/$method"