commit de7139ab77796ed728825cac0911314210d0fe84
Author: Markus Pawlata <markus.pawlata@gmail.com>
Date:   Wed Dec 9 01:33:55 2020 +0100

    Inital commit

diff --git a/README.md b/README.md
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index 0000000..e69de29
diff --git a/requirements.txt b/requirements.txt
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--- /dev/null
+++ b/requirements.txt
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+requests==2.25.0
+slimit==0.8.1
\ No newline at end of file
diff --git a/timestamper.py b/timestamper.py
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+++ b/timestamper.py
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+#!/usr/bin/env python3
+import argparse
+import os
+import re
+import requests
+import subprocess
+import html
+
+from slimit.parser import Parser
+from urllib import parse
+
+GOOGLE_LINK = "https://play.google.com/books/listen?id={id}"
+metadata = {}
+
+parser = argparse.ArgumentParser(
+    description=(
+        "Automatically download chapter-timestamps from Google Books and separate an "
+        "input-file by those timestamps. Title- and track-attributes will be set. "
+        "Google Books url/id (or local file) and the audio-input file are required. "
+        "PLEASE NOTE: This will not download any copyrighted material whatsoever, you "
+        "have to provide the audiofile yourself."
+    ),
+    formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+)
+parser.add_argument(
+    metavar="AUDIOFILE",
+    dest="audio_file",
+    action="store",
+    type=str,
+    help="the audiofile that tracks will be exported from",
+)
+group = parser.add_mutually_exclusive_group(required=True)
+group.add_argument(
+    "-gi",
+    "--google-id",
+    metavar="GOOGLE-BOOKS-ID",
+    dest="google_id",
+    action="store",
+    type=str,
+    help="the id for the audiobook to download the track-data for (e.g. AQAAAEBsuD74QM)",
+)
+group.add_argument(
+    "-gl",
+    "--google-link",
+    metavar="GOOGLE-LINK",
+    dest="google_link",
+    action="store",
+    type=str,
+    help="the link for the audiobook to download the track-data for (e.g. https://play.google.com/books/listen?id=AQAAAEBsuD74QM)",
+)
+group.add_argument(
+    "-mf",
+    "--metadata_file",
+    metavar="METADATA_FILE",
+    dest="metadata_file",
+    action="store",
+    type=str,
+    help="the location of the file that contains the metadata for the tracks",
+)
+
+parser.add_argument(
+    "-o",
+    "--output-folder",
+    metavar="OUTPUT_FOLDER",
+    type=str,
+    help="the folder that the tracks will be written to, created if it does not exist",
+)
+parser.add_argument(
+    "-f",
+    "--format",
+    metavar="FORMAT",
+    default="mp3",
+    type=str,
+    help=(
+        "used as file-extension, ffmpeg will take this and try to derive the audio "
+        "codec"
+    ),
+)
+parser.add_argument(
+    "-cs",
+    "--chapter-separator",
+    default="|",
+    help="what separates the chapter/part names from the timestamps in the file",
+)
+parser.add_argument(
+    "-bc",
+    "--banned-characters",
+    nargs="+",
+    default="/",
+    help="characters that may not show up in generated filenames",
+)
+parser.add_argument(
+    "-e",
+    "--export-only",
+    type=int,
+    default=0,
+    help="limit the number of files that will be exported per run (0 means export all)",
+)
+parser.add_argument(
+    "-dpp",
+    "--dont-prepend-partnames",
+    action="store_true",
+    help="do not prepend the part-names to the chapter names (only works with --google-id or --google-link)",
+)
+parser.add_argument(
+    "-of",
+    "--override-output",
+    action="store_true",
+    help="override existing output-files",
+)
+parser.add_argument(
+    "-ds",
+    "--dont-skip-existing",
+    action="store_true",
+    help="do not skip existing output-files during export, combine with --override-outputs to actually override output-files",
+)
+parser.add_argument(
+    "-d", "--debug", action="store_true", help="adds some debug messages to the output"
+)
+parser.add_argument(
+    "-nm",
+    "--no-metadata",
+    action="store_true",
+    help="do not save metadata to exported tracks (ffmpeg will still copy some on it's own)",
+)
+parser.add_argument(
+    "-nr",
+    "--no-resume",
+    action="store_true",
+    help="ignore local metadata (only works with --google-id or --google-link)",
+)
+args = parser.parse_args()
+
+
+def die(message: str = "", value=1):
+    """
+    Prints the optional message then halts the script with non-zero return value.
+
+    :param message: Message to be printed, defaults to ""
+    :type message: str, optional
+    :param value: Return value on exit, defaults to 1
+    :type value: int, optional
+    """
+    if message:
+        print(message)
+    exit(value)
+
+
+def milli(value: str) -> float:
+    """
+    Tries to convert a given string into 1/1000
+
+    :param value: Value to be converted.
+    :type value: str
+    :return: 1/1000 of the input on success, None on error.
+    :rtype: float
+    """
+    try:
+        return int(value) / 1000
+    except ValueError:
+        return None
+
+
+def save_metadata_to_file(
+    tracks: list, destination: os.PathLike, metadata: dict = None, source: str = None
+):
+    """
+    Save the passed tracks into the destination file, optionally noting the source.
+
+    :param tracks: A list of tracks you want to save, a list item should look like: {"name": "Chapter Name", "start": 10.0030, "end": 128.1020}
+    :type tracks: list
+    :param destination: Path for the file that will be written to
+    :type destination: os.PathLike
+    :param source: A source-reference, embedded in the file as a comment, defaults to None
+    :type source: str, optional
+    """
+    with open(destination, "w") as fp:
+        fp.writelines(
+            [
+                "# Automatically created using timestamper\n",
+                f"# Source: {source}\n" if source else "",
+            ]
+            + (
+                [f"# @{k}{args.chapter_separator}{v}\n" for k, v in metadata.items()]
+                if metadata
+                else []
+            )
+            + [
+                f"{t.get('name')}{args.chapter_separator}{t.get('start')}|{t.get('end')}\n"
+                for t in tracks
+            ]
+        )
+
+
+def load_metadata_from_file(path: os.PathLike) -> list:
+    """
+    Load the track-metadata from a file
+
+    :param path: Path to the file the metadata will be read from.
+    :type path: os.PathLike
+    :return: A list of dicts, containing the tracks
+    :rtype: list
+    """
+    metadata = {}
+    if os.path.exists(path):
+        try:
+            tracks = []
+            with open(path, "r") as fp:
+                track_lines = fp.readlines()
+                for line in track_lines:
+                    if line.startswith("# @"):
+                        parts = line.lstrip("# @").split(args.chapter_separator)
+                        if len(parts) != 2:
+                            print(f"Ignored malformed line: {line}")
+                            continue
+                        metadata[parts[0]] = parts[1].strip()
+
+                    elif line.startswith("#") or not len(line.strip()):
+                        continue
+
+                    elif line.count(args.chapter_separator) != 2:
+                        die(
+                            f'Line "{line}" does not contain the chapter-name/time '
+                            f'separator "{args.chapter_separator}" (only) once.'
+                        )
+
+                    parts = line.split(args.chapter_separator)
+                    tracks.append(
+                        {
+                            "name": parts[0].strip(),
+                            "start": parts[1].strip(),
+                            "end": parts[2].strip(),
+                        }
+                    )
+            return (tracks, metadata)
+        except PermissionError:
+            die("track_file: no permission to read {}".format(args.track_file))
+
+
+def get_tracks_from_google(url: str) -> list:
+    """
+    Load metadata from google.
+
+    :param url: Metadata will be scraped from the page identified by this URL.
+    :type url: str
+    :return: [description]
+    :rtype: list
+    """
+    metadata = {}
+    req = requests.get(url)
+    if req.status_code == 200:
+        _html = req.text
+    else:
+        die(f"Could not get page from google: {url}")
+
+    matches = re.findall("_OC_contentInfo = ([^;]*)", _html)
+    if not matches:
+        die("No chapters found in the google-page, maybe the markup has changed?")
+
+    parser = Parser(yacc_optimize=False, lex_optimize=False)
+    tree = parser.parse(matches[0])
+    chapters = tree.children()[0].children()[0].children()[0].children()[0].children()
+
+    matches = re.findall(r'<title id="main-title">(.*) - Google Play<\/title>', _html)
+    if matches:
+        metadata["title"] = html.unescape(matches[0])
+
+    tracks = []
+    current_part = ""
+    last_timestamp = 0
+    last_name = ""
+
+    for c in chapters:
+        item_number = len(c.items)
+        a = ""
+        b = ""
+        try:
+            a = c.items[0].value.strip('"')
+            b = c.items[1].value.strip('"')
+        except IndexError:
+            pass
+
+        if item_number == 1:
+            last_name = a
+        elif item_number == 2:
+            current_part = a
+            if milli(c.items[1].value.strip('"')) != last_timestamp:
+                tracks.append(
+                    {
+                        "name": last_name,
+                        "start": last_timestamp,
+                        "end": milli(b),
+                    }
+                )
+                last_name = a
+                last_timestamp = milli(b)
+        elif item_number == 3:
+            if milli(b) != last_timestamp:
+                tracks.append(
+                    {
+                        "name": last_name,
+                        "start": last_timestamp,
+                        "end": milli(b),
+                    }
+                )
+            if current_part:
+                last_name = f"{current_part}: " + a
+            else:
+                last_name = a
+            last_timestamp = milli(b)
+
+    tracks.append(
+        {
+            "name": last_name,
+            "start": last_timestamp,
+            "end": "",
+        }
+    )
+    return tracks, metadata
+
+
+def main():
+    tracks = []
+    if not os.path.exists(args.audio_file):
+        die("AUDIO_FILE: {} doesn't exist.".format(args.audio_file))
+
+    if not args.output_folder:
+        args.output_folder = os.getcwd()
+
+    export_folder = os.path.abspath(args.output_folder)
+    if os.path.exists(export_folder):
+        pass
+    elif os.path.exists(os.path.dirname(export_folder)):
+        os.makedirs(export_folder)
+    else:
+        die(f'OUTPUT_FOLDER: "{export_folder}" does not exist.')
+
+    if args.google_id:
+        args.google_link = GOOGLE_LINK.format(id=args.google_id)
+
+    if args.google_link:
+        parsed = parse.urlparse(args.google_link)
+        id = parse.parse_qs(parsed.query).get("id")
+        if not id:
+            die(f"This does not look right: {args.google_link}")
+        id = id[0]
+        destination = f"{export_folder}{os.path.sep}{id}.txt"
+        if os.path.exists(destination) and not args.no_resume:
+            print(f"Using local metadata: {destination}")
+            tracks, metadata = load_metadata_from_file(destination)
+        else:
+            tracks, metadata = get_tracks_from_google(args.google_link)
+            if metadata.get("title"):
+                export_folder = (
+                    os.getcwd()
+                    + os.path.sep
+                    + "".join(
+                        c
+                        for c in metadata.get("title")
+                        if c not in args.banned_characters
+                    )
+                )
+                destination = f"{export_folder}{os.path.sep}{id}.txt"
+                if os.path.exists(export_folder):
+                    pass
+                elif os.path.exists(os.path.dirname(export_folder)):
+                    os.makedirs(export_folder)
+                else:
+                    die(f'OUTPUT_FOLDER: "{export_folder}" does not exist.')
+        save_metadata_to_file(
+            tracks, destination, metadata=metadata, source=args.google_link
+        )
+
+    if args.metadata_file:
+        tracks, metadata = load_metadata_from_file(args.metadata_file)
+
+    try:
+        if not tracks:
+            die(
+                'No tracks found, check format: "Chapter name|(hh:mm:ss|mm:ss|s*)", the '
+                "time represents the length of the chapter."
+            )
+    except NameError:
+        die("Error in reading the TRACKFILE or parsing the google page.")
+
+    print(f"{len(tracks)} tracks to export to {export_folder}.")
+    if args.export_only > 0:
+        print(f"We are only exporting {args.export_only}.")
+    exported = 0
+    skipped = 0
+    try:
+        iterator = 1
+        for track in tracks:
+            chapter_name = (
+                f"{str(iterator).zfill(len(str(len(tracks))))}. "
+                + "".join(
+                    char for char in track["name"] if char not in args.banned_characters
+                ).strip()
+            )
+            meta_title = "".join(
+                char for char in track["name"] if char not in args.banned_characters
+            ).strip()
+            destination = f"{export_folder}{os.path.sep}{chapter_name}.{args.format}"
+            if (not args.dont_skip_existing) and os.path.exists(destination):
+                print(f'Skipped "{chapter_name}" ({iterator}/{len(tracks)})')
+                skipped += 1
+                iterator += 1
+                continue
+            command = (
+                [
+                    "ffmpeg",
+                    "-y" if args.override_output else "-n",
+                    "-ss",
+                    str(track["start"]),
+                    "-i",
+                    args.audio_file,
+                ]
+                + (["-to", str(track["end"]), "-copyts"] if track["end"] else [])
+                + [
+                    "-metadata",
+                    f"title={meta_title}",
+                    "-metadata",
+                    f"track={iterator}",
+                    f"{destination}",
+                ]
+            )
+
+            if args.debug:
+                print(" ".join(command))
+            run_result = subprocess.run(
+                command,
+                capture_output=True,
+            )
+            if run_result.returncode != 0:
+                print(f"command was: '{' '.join(command)}'")
+                die(f"ffmpeg did not terminate normally: {str(run_result.stderr)}")
+
+            print(f'Exported "{chapter_name}" ({iterator}/{len(tracks)})')
+            exported += 1
+            iterator += 1
+            if args.export_only > 0 and args.export_only == exported:
+                break
+
+    except KeyboardInterrupt:
+        print("\nKeyboardInterrupt, aborted processing.\n")
+    print(f"Exported {exported} tracks to {export_folder}.")
+    if skipped:
+        print(f"Skipped {skipped} files that already existed.")
+
+
+if __name__ == "__main__":
+    main()