commit 8cdf42cedde434dc4a5e06eabbbce43fa84f453f
Author: Karchnu <karchnu@karchnu.fr>
Date:   Sat Mar 27 21:18:08 2021 +0100

    First commit.

diff --git a/README.md b/README.md
new file mode 100644
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--- /dev/null
+++ b/README.md
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+# Required applications
+
+* soxi
+* ffmpeg
+
+# Usage
+
+```Bash
+get-tracks.sh rip audio-file time-file
+```
+
+
+`audio-file` can be in any format understood by `soxi` and `ffmpeg`
+
+In the `time-file`:
+
+```
+0:00 First song
+2:20 Second song
+3:18 Awesome song
+```
+
+# Environment variables
+
+* SIMULATION [0|1] do not invoke ffmpeg
+* FORMAT [mp3,ogg,opus,…] for the song file format
+* WITH_NUMBER [separator] if not null, write song number with this separator
+  example: WITH_NUMBER=_ Song names will be 1_song.opus 2_song.opus (...)
+* QUIET: if set to any value, ffmpeg commands are not displayed
+
+
+# More
+
+Run `get-track.sh` without arguments.
diff --git a/get-tracks.sh b/get-tracks.sh
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--- /dev/null
+++ b/get-tracks.sh
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+#!/usr/bin/env sh
+
+get_time(){
+	echo "$*" | sed "s/[ \t].*//"
+}
+
+get_title(){
+	echo "$*" | cut -d ' ' -f 2-
+}
+
+reverse_word_order(){
+	local result=
+	for word in $@; do
+		result="$word $result"
+	done
+	echo "$result" 
+}
+
+# bc is mandatory: arythmetic operations are very limited in ash.
+get_seconds(){
+	local n=0
+	local v=0
+
+	values=$(echo "$*" | sed 's/:/\
+/g' | sed "s/^0//")
+	for i in $(reverse_word_order $values); do
+		case $n in
+			0) v=$(echo "$v +         $i " | bc);;
+			1) v=$(echo "$v + (60   * $i)" | bc);;
+			2) v=$(echo "$v + (3600 * $i)" | bc);;
+			*) echo "invalid timecode $*"; exit 1;;
+		esac
+
+		n=$((n+1))
+	done
+
+	echo $v
+}
+
+# Get a more usable time representation for the beginning and the end of songs.
+get_values(){
+
+	audio_file="$1"
+	time_file="$2"
+	total_length=$(soxi -D "${audio_file}" | sed "s/\..*//") # integer values only
+
+	n=0
+
+	while read X; do
+
+		if [ $n -ne 0 ]; then
+			to=$(get_time $X)
+			to_s=$(get_seconds $to)
+			echo -e "$from_s\t$to_s\t$title"
+		fi
+
+		#echo $X
+		from=$(get_time $X)
+		from_s=$(get_seconds $from)
+		title=$(get_title $X)
+
+		if [ -z "${WITH_NUMBER}" ]; then
+			:
+		else
+			title="${n}${WITH_NUMBER}${title}"
+		fi
+
+		n=$(echo $n + 1 | bc)
+	done < "${time_file}"
+
+	echo -e "$from_s\t$total_length\t$title"
+}
+
+run_ffmpeg(){
+	local file=$1
+	local from=$2
+	local duration=$3
+	local title=$4
+
+	if [ "${SIMULATION}" -eq 1 ]; then
+		[ -z "${QUIET}" ] && echo "ffmpeg -loglevel error -ss '$from' -t '$duration' -i '${file}' '${title}'"
+	else
+		[ -z "${QUIET}" ] && echo "ffmpeg -loglevel error -ss '$from' -t '$duration' -i '${file}' '${title}'"
+		$(< /dev/null ffmpeg -loglevel quiet -ss "$from" -t "$duration" -i "${file}" "${title}")
+	fi
+}
+
+rip(){
+	n=0
+	from=0
+	to=0
+
+	audio_file="$1"
+	time_file="$2"
+
+	[ "$FORMAT" = "" ] && echo "default format: opus" && FORMAT="opus"
+
+	#echo "from	to	duration	title"
+	get_values "$audio_file" "$time_file" | while read LINE; do
+		from=$(echo $LINE | cut -d ' ' -f 1)
+		to=$(echo $LINE | cut -d ' ' -f 2)
+		title=$(echo $LINE | cut -d ' ' -f 3-)
+		duration=$(echo "$to - $from" | bc)
+
+		run_ffmpeg "${audio_file}" "${from}" "${duration}" "${title}.${FORMAT}"
+		n=$((n + 1))
+	done
+}
+
+usage(){
+	echo "usage: $0 command"
+	echo "command: show <single-file-playlist> <song-list>"
+	echo "command: rip  <single-file-playlist> <song-list>"
+	echo
+	echo "song-list line format example: 1:30 My second track of the playlist"
+	echo "show output format: start end title"
+	echo
+	echo "envvar: SIMULATION [0|1] (do not invoke ffmpeg)"
+	echo "envvar: FORMAT [mp3,ogg,opus,…] (see the ffmpeg documentation)"
+	echo "envvar: WITH_NUMBER [separator] (not null = write song number, with this separator)"
+	echo "        example: WITH_NUMBER=_ Song names will be 1_song.opus 2_song.opus…"
+	echo "envvar: QUIET (if set to any value, ffmpeg commands are not displayed)"
+}
+
+if [ $# -lt 1 ]; then
+	usage
+	exit 0
+fi
+
+command=$1
+shift
+
+case "x-${command}" in
+	x-show)
+
+		# Takes the audio file in first parameter
+		if [ $# -ne 2 ]; then
+			echo "Usage: $0 show music-file time-stamps-file"
+			exit 1
+		fi
+
+		get_values "$1" "$2"
+		;;
+
+	x-rip)
+
+		# Takes the audio file in first parameter
+		if [ $# -ne 2 ]; then
+			echo "Usage: $0 show music-file time-stamps-file"
+			exit 1
+		fi
+
+		rip "$1" "$2"
+		;;
+	*)
+		usage 1>&2
+		exit 1
+esac