split-songs

#!/bin/env python
# Split songs in a single mp3 into separate files based on a list file  in the form
#    HH:SS Song Name 1
#    HH:SS Song Name 2
#    ...

import sys
import os


def adjust_start(ints):
    i = len(ints)-1
    while i >= 0:
        if ints[i] != 59:
            ints[i] += 1
            return ints
        ints[i] = 00
    else:
        return [0]*len(ints)

def fixup_time(text, adjust=False):
    parts = text.split(':')
    ints = [int(p) for p in parts]
    if adjust:
        ints = adjust_start(ints)
    parts = ['{:02}'.format(int(p)) for p in ints]
    if len(parts) == 1:
        return ':'.join(['00']*2 + parts)
    elif len(parts) == 2:
        return ':'.join(['00'] + parts)
    elif len(parts) == 3:
        return ':'.join(parts)
    else:
        return ':'.join(parts[:3])


def read_song_list(path):
    parts = []
    with open(path) as fh:
        for line in fh:
            parts.append(line.strip().split(' ', 1))

    if len(parts) < 2:
        print('ERROR: at least two songs must be listed.')
        sys.exit(1)

    songs = []
    for i, entry in enumerate(parts[:-1]):
        songs.append((fixup_time(parts[i][0], True), fixup_time(parts[i+1][0]), '{:02} - {}'.format(i+1, parts[i][1])))
    songs.append((fixup_time(parts[-2][0], True), fixup_time(parts[-1][0]), '{:02} - {}'.format(len(parts), parts[-1][1])))

    return songs


def extract_song(source, song_desc):
    tmpl = 'mp3cut -o "{}.mp3" -t {}-{} "{}"'
    cmd = tmpl.format(song_desc[2], song_desc[0], song_desc[1], source)
    print(cmd)
    os.system(cmd)


if __name__ == '__main__':
    songs = read_song_list(sys.argv[2])
    for song in songs:
        extract_song(sys.argv[1], song)