Write our own m3u parser

js/index.js

@@ -3,7 +3,6 @@
 import Raven from "raven-js";
 import createMiddleware from "raven-for-redux";
 import isButterchurnSupported from "butterchurn/lib/isSupported.min";
-import { parse } from "m3u-parser";
 import osx from "../skins/MacOSXAqua1-5.wsz";
 import topaz from "../skins/TopazAmp1-2.wsz";
 import visor from "../skins/Vizor1-01.wsz";
@@ -16,6 +15,7 @@ import "../mp3/test/01 Ghosts I.mp3";
 import "../mp3/test/02 Ghosts I.mp3";
 import "../mp3/test/03 Ghosts I.mp3";
 import internetArchive from "../skins/Internet-Archive.wsz";
+import m3uParser from "./m3uParser";
 import MilkdropWindow from "./components/MilkdropWindow";
 import screenshotInitialState from "./screenshotInitialState";
 import { WINDOWS } from "./constants";
@@ -305,7 +305,7 @@ Raven.context(async () => {
   const parentDirectory = getParentDirectory(m3u);
   const resonse = await fetch(m3u);
   const text = await resonse.text();
-  const playlist = await parse(text);
+  const playlist = m3uParser(text);
   const m3uTracks = playlist.map(m3uTrack => ({
     url: `${parentDirectory}${m3uTrack.file}`,
     duration: m3uTrack.duration,

js/m3uParser.ts

@@ -0,0 +1,41 @@
+const EXTINF_REGEX = /^#EXTINF:(-?)(\d+),(.*)$/;
+
+interface M3uTrack {
+  title: string;
+  duration: number;
+  file: string;
+}
+
+export default function parseM3u(content: string): Array<M3uTrack> {
+  // TODO: Support Windows line endings
+  const lines = content.split("\n").filter(Boolean);
+  const firstLine = lines[0];
+
+  if (!firstLine || !firstLine.startsWith("#EXTM3U")) {
+    throw new Error("Content is not a valid M3U playlist");
+  }
+
+  const tracks = [];
+  for (var i = 1; i < lines.length; i++) {
+    const line = lines[i];
+    if (!line.startsWith("#EXTINF")) {
+      continue;
+    }
+    var result = EXTINF_REGEX.exec(line);
+    if (!result) {
+      throw new Error(`Invalid EXTINF at line ${i}`);
+    }
+    const nextLine = lines[++i];
+    if (nextLine == null) {
+      throw new Error(`Missing track path at line ${i}`);
+    }
+
+    tracks.push({
+      title: result[3].trim(),
+      duration: Number(result[1] + result[2]),
+      file: nextLine.trim()
+    });
+  }
+
+  return tracks;
+}

package.json

@@ -139,7 +139,5 @@
     ]
   },
   "prettier": {},
-  "dependencies": {
-    "m3u-parser": "^1.0.3"
-  }
+  "dependencies": {}
 }

yarn.lock

@@ -1376,10 +1376,6 @@ block-stream@*:
   dependencies:
     inherits "~2.0.0"
 
-bluebird@^3.1.1:
-  version "3.5.2"
-  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.2.tgz#1be0908e054a751754549c270489c1505d4ab15a"
-
 bluebird@^3.5.1:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
@@ -5496,12 +5492,6 @@ lru-cache@^4.1.1:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
-m3u-parser@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/m3u-parser/-/m3u-parser-1.0.3.tgz#220fbdd5e54ccda7c230fcb09b59fd5ab4ba06a3"
-  dependencies:
-    bluebird "^3.1.1"
-
 macaddress@^0.2.8:
   version "0.2.8"
   resolved "https://registry.yarnpkg.com/macaddress/-/macaddress-0.2.8.tgz#5904dc537c39ec6dbefeae902327135fa8511f12"