APGTEK mp3 player copy bash script - that handles the sorting of files properly (sort by name and by time)

agptek.sh

#!/bin/bash

set -e

SOURCE_DIR=$1
TARGET_DIR=$2
DEBUG=${DBG:-0}

function info() {
	echo -e "\e[92m$@\e[0m"
}

function debug() {
	if [ "${DEBUG}" -ne 0 ]; then
		echo -e "\e[34m$@\e[0m"
	fi
}

function usage() {
	error "$0 <SOURCE_DIRECTORY> <TARGET_DIRECTORY>"	
}

function error() {
	echo -e "\e[31m$@\e[0m"
	exit 1
}

function copyMusic() {
	local file="$1"
	local target="$2"
	info "   |- ${file} => ${target}"
	cp -f "${file}" "${target}"
}

function copyMusicDir() {
	local dir="$1"
	_found=$(find ${dir} -maxdepth 1 -iname '*.mp3' | wc -l)
	if (( _found > 0 )); then
		info "Processing directory '${dir}'"
		target_dir="${TARGET_DIR}/$(basename $dir | sed 's/ /_/g' | sed 's/!//g' | tr '[A-Z]' '[a-z]')"
		source_dir="${dir}"
		debug "  - source dir: ${source_dir}"
		debug "  - target dir: ${target_dir}"
		mkdir -p "${target_dir}"
		info "  \- music files: ${_found}"
		find ${source_dir} -maxdepth 1 -type f -iname '*.mp3' -print0 | sort -z |
			while IFS= read -r -d '' _file; do
				copyMusic "${_file}" "${target_dir}"
				# we have to sleep here - agptek is sorting by filename and timestamps...
				sleep 1s
			done
	else
		debug "Skip directory '${dir}' - no music files found"
	fi
}

if [ $# -ne 2 ]; then
	usage
fi

info "Searching for subdirs in '${SOURCE_DIR}'"
find ${SOURCE_DIR} -maxdepth 1 -type d -print0 | 
	while IFS= read -r -d '' _dir; do
		copyMusicDir "${_dir}"
	done