mpvc-autopilot

#!/usr/bin/env sh
#
# @file mpvc-autopilot
# @description mpvc auto pause/resume audio based on device presence
# @author gmt4 <gmt4 at github.com> (c) Copyright 2022 GPLv2+
# @url github.com/gmt4/mpvc
# SPDX-License-Identifier: GPL-2.0-or-later
#

PROGNAME=${0##*/}
PROGVERSION="v1.8"
PROGAUTHOR=gmt4
PROGURL="https://github.com/gmt4/mpvc"

set -euf

mpvcap_defaults()
{
    ARGS=${ARGS:-}

    MPVC_AP_NCHECK=${MPVC_AP_NCHECK:-3}
    MPVC_AP_PERIOD=${MPVC_AP_PERIOD:-300}
    MPVC_AP_HOURMIN=${MPVC_AP_HOURMIN:-6}
    MPVC_AP_HOURMAX=${MPVC_AP_HOURMAX:-20}
    MPVC_AP_CMD=${MPVC_AP_CMD:-mpvcap_autostart}
    MPVC_AP_CHECK=${MPVC_AP_CHECK:-mpvcap_pingcheck}
}

mpvcap_date() { echo "[$(date +%H:%M)]"; }
mpvcap_pingcheck() { ping -c 5 "$@" | awk 'NR == 2 && /time=/ { sub(":.*time=",": time="); print }'; }
mpvcap_btcheck()   { hcitool scan | awk "/$@/ {print}"; }

# autopilot play tracks at random from musicdir each PERIOD secs
mpvcap_autopilot()
{
    echo "# $(mpvcap_date) $PROGNAME $@ $MPVC_AP_CMD $MPVC_AP_CHECK PERIOD=$MPVC_AP_PERIOD NCHECK=$MPVC_AP_NCHECK [$MPVC_AP_HOURMIN,$MPVC_AP_HOURMAX]"
    outputdir=$(mpvc-fzf -OO)
    while sleep ${MPVC_AP_PERIOD}
    do
        hour=$(date +%_H)
        if [ "$hour" -ge ${MPVC_AP_HOURMIN} -a "$hour" -lt ${MPVC_AP_HOURMAX} ]
        then
            pause=$(mpvc -q get pause || true)
            next=$(find $(mpvc-fzf -OO) -type f | shuf -n1)
            echo "# $(mpvcap_date) $PROGNAME next $next"
            if [ "$pause" != "yes" ]; then
                mpvc -n "$next"
            fi
        fi
    done
}

# autostart checks for device/phone: if present resume audio, otherwise, pause.
mpvcap_autostart()
{
    target="$1"
    ncheck=0

    echo "# $PROGNAME $@ $MPVC_AP_CMD $MPVC_AP_CHECK PERIOD=$MPVC_AP_PERIOD NCHECK=$MPVC_AP_NCHECK [$MPVC_AP_HOURMIN,$MPVC_AP_HOURMAX]"
    while sleep ${MPVC_AP_PERIOD}
    do
        hour=$(date +%_H)
        pause=$(mpvc -q get pause || true)
        check="$($MPVC_AP_CHECK "$target")"
        nsign=$(if [ -n "$check" ]; then echo +; else echo -; fi)
        ncheck=$(( ( $ncheck $nsign 1 ) % ( $MPVC_AP_NCHECK + 1 ) ))
        if [ "$hour" -ge ${MPVC_AP_HOURMIN} -a "$hour" -lt ${MPVC_AP_HOURMAX} ]
        then
            if [ "$ncheck" -gt 0 ]; then mpvc -q resume || true; fi       # n>0 pings up: resume
            if [ "$ncheck" -le -$MPVC_AP_NCHECK ]; then mpvc -q pause || true; fi # n<0 pings down: pause
        fi
        echo "# $(mpvcap_date) $PROGNAME PERIOD=$MPVC_AP_PERIOD NCHECK=$MPVC_AP_NCHECK pause=$pause c=${#check} n=${ncheck} $check" # $@
    done
}

optflags="c:hi:n:p:m:M:"
usage()
{
    cat <<EOF
usage: $PROGNAME -[$optflags] args # @version $PROGVERSION (c) $PROGAUTHOR $PROGURL
 -i : The IP of the device to detect ping presence for $PROGNAME (*required)
 -c : The operation cmd to run $PROGNAME (default: $MPVC_AP_CMD)
 -C : The presence check to run $PROGNAME (default: $MPVC_AP_CHECK)
 -p : The number of seconds between ping presence checks (default: $MPVC_AP_PERIOD)
 -n : The number of failed ping presence checks after which to pause mpvc (default: $MPVC_AP_NCHECK)
 -m : The minimum hour when to start ping presence (default: ${MPVC_AP_HOURMIN}h AM)
 -M : The maximum hour when to stop ping presence (default: ${MPVC_AP_HOURMAX}h PM)
*tips: If unsure where to begin, run: $PROGNAME -i 192.168.0.2 # your tablet/phone LAN IP
EOF
    exit;
}

main()
{
    mpvcap_defaults
    [ $# -lt 1 ] && usage

    while getopts "$optflags" flag;
    do
        case "$flag" in
        h) usage ;;
        i) ARGS="$OPTARG"; ;;
        c) MPVC_AP_CMD="$OPTARG"; ;;
        p) MPVC_AP_PERIOD="$OPTARG"; ;;
        n) MPVC_AP_NCHECK="$OPTARG"; ;;
        m) MPVC_AP_HOURMIN="$OPTARG" ;;
        M) MPVC_AP_HOURMAX="$OPTARG" ;;
        *) usage ;;
        esac
    done
    shift $((OPTIND - 1))

    [ -z "${ARGS:-}" ] && usage "Error: No -i option provided (required)"
    case "$MPVC_AP_CMD" in
    mpvcap_autostart) mpvcap_autostart "$ARGS" ;;
    mpvcap_autopilot) mpvcap_autopilot "$ARGS" ;;
    *) usage ;;
    esac
}

main "$@"