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#!/usr/bin/env sh

# Description: Appends and optionally plays music in MOC
#
# Notes:
# - if selection is available, plays it, else plays the current file or directory
# - appends tracks and exits is MOC is running, else clears playlist and adds tracks
# - to randomize the order of files appended to the playlist, set SHUFFLE=1
#   if you add a directory with many files when SHUFFLE=1 is set, it might take a very long time to finish!
#
# Shell: POSIX compliant
# Author: Arun Prakash Jana, ath3

IFS="$(printf '\n\r')"
selection=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection
cmd=$(pgrep -x mocp 2>/dev/null)
ret=$cmd

SHUFFLE=0

mocp_add ()
{
    if [ $SHUFFLE = 1 ]; then
        if [ "$resp" = "y" ]; then
            arr=$(tr '\0' '\n' < "$selection")
        elif [ -n "$1" ]; then
            arr="$1"
        fi

        for entry in $arr
        do
            if [ -d "$entry" ]; then
                arr2=$arr2$(find "$entry" -type f)
            else
                arr2=$(printf "%s\n%s" "$entry" "$arr2")
            fi
        done

        arr2=$(echo "$arr2" | awk 'BEGIN{srand();}{print rand()"\t"$0}' | sort -k1 -n | cut -f2-)
        for entry in $arr2
        do
            if [ -f "$entry" ] &&  echo "$entry" | grep -qv '\.m3u$\|\.pls$' ; then
                mocp -a "$entry"
            fi
        done

    else
        if [ "$resp" = "y" ]; then
            xargs < "$selection" -0 mocp -a
        else
            mocp -a "$1"
        fi
    fi
}

if [ ! -s "$selection" ] && [ -z "$1" ]; then
   exit
fi

if [ "$2" = "opener" ]; then
    :
elif [ -s "$selection" ]; then
    printf "Work with selection? Enter 'y' to confirm: "
    read -r resp
fi

if [ -z "$ret" ]; then
    # mocp not running
    mocp -S
else
    # mocp running, check if it's playing
    state=$(mocp -i | grep "State:" | cut -d' ' -f2)

    if [ "$state" = 'PLAY' ]; then
        # add to playlist and exit
        mocp_add "$1"

        # uncomment the line below to show mocp interface after appending
        # mocp

        exit
    fi
fi

# clear selection and play
mocp -c
mocp_add "$1" "$resp"
mocp -p

# uncomment the line below to show mocp interface after appending
# mocp