initial commit

to-m4b.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -x
+set -eufo pipefail
+
+# CONSTANTS
+declare -r m4b-tool="nix run github:sandreas/m4b-tool#m4b-tool-libfdk -- "
+declare -r script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# VARS
+LEADING_ZEROES=2
+SRC="${SRC:${script_dir}/src}"
+OUT="${OUT:${script_dir}/out}"
+AUTHOR="${AUTHOR:-}"
+NARRATOR="${NARRATOR:-}"
+TITLE="${TITLE:-}"
+YEAR="${YEAR:-}"
+SERIES="${SERIES:-}"
+SERIES_INDEX="${SERIES_INDEX:-}"
+
+# FUNCTIONS
+parse-vars() {
+  # TODO implement parsing the directory structure to fill in missing vars and return them
+  # Series structure: ${SRC}/<author>/<series>/Book <part> - <year> - <book> {<narrator>}/
+  # Standalone structure: ${SRC}/<author>/<year> - <book> {<narrator>}/
+  # Return the <part> wihh leading zeros based on the LEADING_ZEROES variable
+}
+
+get-book-directories() {
+  # TODO implemet getting the book directoris based on the ${SRC} path
+  # find the directories that contains the books files and return them as an array
+  # Example book directory:
+  # /path/to/src/Author/Series/Book Part - Year - Book {Narrator}/
+  # /path/to/src/Author/Year - Book {Narrator}/
+}
+
+m4b-merge() {
+  local output_file="${1}"
+  local source_dir="${2}"
+  local author="${3}"
+  local narrator="${4}"
+  local title="${5}"
+  local year="${6}"
+  local series="${7}"
+  local series_index=${8}
+
+  mkdir -p "$(dirname "${output_file}")"
+  "${m4b-tool}" \
+    merge \
+      -v \
+      --jobs=6 \
+      --audio-samplerate=44100 \
+      --audio-quality=100 \
+      --writer="${author}" \
+      --artist="${narrator}" \
+      --title="${title}" \
+      --year="${year}" \
+      --album="${series}" \
+      --album-sort="${series_index}" \
+      --output-file="${output_file}/" \
+      -- "${source_dir}"
+}
+
+main() {
+  parse-vars
+  local book_dirs
+  IFS=$'\n' read -r -d '' -a book_dirs < <(get-book-directories && printf '\0')
+  for book_dir in "${book_dirs[@]}"; do
+    local book_output_file="${OUT}/${AUTHOR}/${(SERIES:+${SERIES}/)}${(SERIES:+Book ${SERIES_INDEX} - )}${YEAR} - ${TITLE}.m4b"
+    m4b-merge "${LEADING_ZEROES}" "${book_output_file}" "${book_dir}" "${AUTHOR}" "${NARRATOR}" "${TITLE}" "${YEAR}" "${SERIES}" "${SERIES_INDEX}"
+  done
+}
+
+main "$@"