neckaros/parse-torrent-title

Parse torrent title to extract useful information

parse-torrent-title

This package helps you extract information from a torrent name such as language, resolution and codec.

Installation

You can install it using npm:

npm install parse-torrent-title

You should use Node 8.0 or higher to use this package.

Usage

A simple usage is as follows:

const ptt = require("parse-torrent-title");
const information = ptt.parse("Game.of.Thrones.S01E01.720p.HDTV.x264-CTU");

console.log(information.title);      // Game of Thrones
console.log(information.season);     // 1
console.log(information.episode);    // 1
console.log(information.resolution); // 720p
console.log(information.codec);      // x264
console.log(information.source);     // HDTV
console.log(information.group);      // CTU

Advanced usage

This module is configurable and extendable using handlers and regular expressions.

Regular expressions

If you want an extra field to be populated, you can use a regular expression as follow:

const ptt = require("parse-torrent-title");
ptt.addHandler("part", /Part[. ]([0-9])/i, { type: "integer" });
const information = ptt.parse("Silent.Witness.S18E03.Falling.Angels.Part.1.720p.HDTV.x264-FTP");

console.log(information.part); // 1

If you want to keep only a part of the matched regular expression, you should use capturing groups explained here.

For regular expressions, the following options are available:

• skipIfAlreadyFound (default to true) which will skip the regular expression if a previous handler for the same information already found something.
• type (default to string) which indicates what is the expected output of the regular expression. It can be:
  • string: does nothing
  • integer: convert the matching part into an integer
  • lowercase: convert the matching part to lowercase
  • boolean: convert to true if there is a matching part
• value (default to undefined) which, if defined, set the specified value instead of the matching part as the result

Handlers

A handler is a function with the title and the resulting information as parameters. It can modify the result in any wanted way. If the matched string is not part of the title, it should return the beginning of it.

const ptt = require("parse-torrent-title");
const information = ptt.parse("[REQ] Harry Potter And The Prisoner Of Azkaban 2004 1080p BluRay DTS x264-hV");
console.log(information.isHarryPotterRelated); // undefined

ptt.addHandler(({ title, result }) => {
    const match = title.match(/harry.potter/i);
    if (match) {
        result.isHarryPotterRelated = true;
    }
});

const information2 = ptt.parse("[REQ] Harry Potter And The Prisoner Of Azkaban 2004 1080p BluRay DTS x264-hV");
console.log(information2.isHarryPotterRelated); // true

Multiple parsers

You may want several parsers within the same project. To do that, you can simply create new parsers:

const { Parser } = require("parse-torrent-title");
const parser = new Parser();
const anotherParser = new Parser();

By default, a freshly created parser has no handler. If you want to add default handlers to a parser, you can do so using the specific method:

const { Parser, addDefaults } = require("parse-torrent-title");
const parser = new Parser();
addDefaults(parser); // parser is now ready

Usage with TypeScript

If you add new properties with addHandler in TypeScript, the result type DefaultParserResult will not be updated, and you will encounter a TS2339 error.

To prevent this error and have autocomplete, you should create a ParserResult interface with the expected properties. It is possible to extend the DefaultParserResult interface to get all the default properties. Then, create a new Parser object using the above interface. Finally, use the parse function as usual.

Example:

import { Parser, DefaultParserResult, addDefaults } from "parse-torrent-title";

interface ParserResult extends DefaultParserResult {
    part?: number;
}

const parser = new Parser<ParserResult>();
addDefaults(parser);
parser.addHandler('part', /(?:Part|CD)[. ]?([0-9])/i, { type: 'integer' })
const parse = parser.parse;

const result = parse('Watergate.2018.Part1.DOC.SUBFRENCH.1080p.HDTV.H264-ELEARNiNG');
console.log(result.year); // 2018 - it works as before
console.log(result.part); // 1 - `part` is now a known property of the `result` object