#!/bin/sh
#==================================
# Copyright Luke Smith
# This notice by Zachary Smith (unrelated)
# booksplit is designed to split audiobooks into chapters
# it can also be used to split whole albums into songs
#==================================

# Requires ffmpeg (audio splitting) and my `tag` wrapper script.

[ ! -f "$2" ] && printf "The first file should be the audio, the second should be the timecodes.\\n" && exit

echo "Enter the album/book title:"; read -r booktitle

echo "Enter the artist/author:"; read -r author

echo "Enter the publication year:"; read -r year

inputaudio="$1"

# Get a safe file name from the book.
escbook="$(echo "$booktitle" | iconv -cf UTF-8 -t ASCII//TRANSLIT | tr -d '[:punct:]' | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | sed "s/-\+/-/g;s/\(^-\|-\$\)//g")"

! mkdir -p "$escbook" && echo "Do you have write access in this directory?" && exit 1

# As long as the extension is in the tag script, it'll work.
ext="mp3"
#ext="${1#*.}"

# Get the total number of tracks from the number of lines.
total="$(wc -l < "$2")"

while read -r x;
do
	end="$(echo "$x" | cut -d' ' -f1)"

	[ -n "$start" ] &&
	echo "From $start to $end; $track $title"
	file="$escbook/$(printf "%.2d" "$track")-$esctitle.$ext"
	[ -n "$start" ] && echo "Splitting \"$title\"..." &&
   	ffmpeg -nostdin -y -loglevel -8 -i "$inputaudio" -ss "$start" -to "$end" -vn -acodec mp3 "$file" &&
	echo "Tagging \"$title\"..." && mid3v2 -a "$author" -A "$booktitle" -t "$title" -T "$track" -y "$year" "$file"
	title="$(echo "$x" | cut -d' ' -f 2-)"
	esctitle="$(echo "$title" | iconv -cf UTF-8 -t ASCII//TRANSLIT | tr -d '[:punct:]' | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | sed "s/-\+/-/g;s/\(^-\|-\$\)//g")"
	track="$((track+1))"
	start="$end"
done < "$2"
# The last track must be done outside the loop.
echo "From $start to the end: $title"
file="$escbook/$(printf "%.2d" "$track")-$esctitle.$ext"
echo "Splitting \"$title\"..." && ffmpeg -nostdin -y -loglevel -8 -i "$inputaudio" -ss "$start" -vn -acodec mp3 "$file" &&
		echo "Tagging \"$title\"..." && mid3v2 -a "$author" -A "$booktitle" -t "$title" -T "$track" -y "$year" "$file"