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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 [ $SHUFFLE = 1 ]; then
        if [ -s "$selection" ]; 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 -v '\.m3u$\|\.pls$')" ]; then
                mocp -a "$entry"
            fi
        done

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

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

if [ -z "$ret" ]; then
    # mocp not running
    mocp -S

    # clear selection and play
    mocp -c
    mocp_add "$1"
    mocp -p
else
    # mocp running, just append
    mocp_add "$1"
fi

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