Set ID3 tags of MP3 files from file names and directory names.

file2utf8tag.sh

#!/bin/bash
#
# If you have bunch of MP3's in a folder with filenames corresponding
# to the titles of songs, but ID3 tags are missing or misformed (for
# example, coming from Windows with cp1251 codepage, but you need
# UTF8), this script will read filenames and set ID3 tags
# correspondingly.
#
# cd to the directory with mp3 files and execute script
# there. Directories on the upper level should have names:
#
# mp3 files directory name: disc name
# directory 1 level up: author
#
# Convention for directory names is:
#
# ├── Author (composed
# │   ├── Disc title
# │   │   ├── 01 Track 1 <--- execute script in songs directory
# │   │   ├── 02 Track 2
# │   │   ├── 03 Track 3
#
# Requirements: uses eyeD3 Python script
#
# Author: Dmytro Kovalov, 2014
#
# Execute:
#
#

set -e

if [ "$1" = "--dry" ]; then
   export DRYRUN="echo"
fi

write_tags () {
  local file="$*"

  local song_title=$(/usr/bin/basename "$file" .mp3)

  track_number=$(echo $song_title | awk '$1 ~ /[0-9]+/ {print $1}' | tr -d .)

  if [ ! -z $track_number ]; then
    song_title=$(echo $song_title | sed "s/${track_number}//")
    track_number_option="--track=$track_number"
  fi

  local file_dir=$(dirname "$file")
  local disk_name=$(basename "$file_dir")
  local disk_dir=$(dirname "$file_dir")
  local artist_name=$(basename "$disk_dir")

  echo ------------------------------------------------------------------
  echo artist: $artist_name
  echo disc: $disk_name
  echo title: $song_title
  echo track num: $track_number

  ${DRYRUN} eyeD3 --to-v2.4 --encoding utf8 \
            --title "$song_title" \
            --artist "$artist_name" \
            --album-artist "$artist_name" \
            --album "$disk_name" \
            $track_number_option \
            "$file"
  echo ==================================================================
  echo
}

attach_images() {
  local file=$@
  local dir=$(dirname "$file")

  find "${dir}" -iname \*.jpg | while read IMAGE; do
    local description=$(basename "${IMAGE}")
    printf " --add-image '%s:OTHER' " "${IMAGE}"
  done
}

main () {
  /usr/bin/find "$(pwd)" -iname \*.mp3 | while read FILE; do
    write_tags "${FILE}"
  done
}

main