Big commit

index.js

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+const signale = require('signale');
+const { join } = require('path');
+const lineByLine = require('linebyline');
+const ytdl = require('ytdl-core');
+const { existsSync, createWriteStream } = require('fs');
+
+signale.start('music-downloader started');
+
+// Start reading every line in the videos.txt file
+const urlList = lineByLine(join(__dirname, 'videos.txt'));
+
+// Empty validated array of video IDs
+let videos = [];
+
+urlList
+  // Each line read triggers this event
+  .on('line', (videoIdResolvable, lineCount) => {
+    // Check if the video ID resolvable is valid
+    if (ytdl.validateURL(videoIdResolvable) || ytdl.validateID(videoIdResolvable)) {
+      // Add the ID for the video to the array
+      videos.push(ytdl.getVideoID(videoIdResolvable));
+    } else {
+      // Alert the user that the video ID resolvable provided was invalid
+      signale.error(`Line ${lineCount} (${videoIdResolvable}) is an invalid YouTube video`);
+    }
+  })
+  // When all lines have been read this event is triggered
+  .on('end', () => {
+    // Remove duplicate unique video IDs
+    videos = videos.filter((elem, pos) => videos.indexOf(elem) === pos);
+
+    signale.info(`${videos.length} videos to download.`);
+
+    videos.forEach(async videoID => {
+      // Get data for determining title of file
+      const data = await ytdl.getBasicInfo(videoID);
+
+      // Display name will be the video title if the given video doesn't have media metadata
+      const displayName = data.media.song ? data.media.song : data.title;
+
+      // Initialize a logger for this video using the display name
+      const videoLogger = signale.scope(displayName);
+
+      // Full file path for the audio file
+      const filePath = join(__dirname, 'audio', `${displayName}.mp4`);
+
+      // Skip over pre-existing files
+      if (existsSync(filePath)) return videoLogger.warn('File already exists, skipping');
+
+      // Get an audio-only ReadableStream
+      const stream = ytdl(videoID, {
+        quality: 'highestaudio',
+        filter: 'audioonly'
+      });
+
+      // Set up event handlers before calling the pipe function
+      stream
+        .on('error', err => {
+          videoLogger.error(err);
+        })
+        // This event is triggered when the stream starts getting piped somewhere
+        .on('pipe', () => {
+          videoLogger.await({ prefix: '[1/2]', message: 'Downloading...' });
+        })
+        // This event is triggered when the stream has finished being flushed to the file system
+        .on('finish', () => {
+          videoLogger.success({ prefix: '[2/2]', message: `Downloaded video to ${filePath}` });
+        });
+
+      // Start piping the audio stream from YouTube to the file path
+      stream.pipe(createWriteStream(filePath));
+    });
+  })
+  .on('error', err => signale.error('Error encountered while attempting to read in settings', err));

package.json

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+{
+  "author": "Jonah Snider <[email protected]> (jonahsnider.ninja)",
+  "dependencies": {
+    "linebyline": "1.3.0",
+    "signale": "1.2.1",
+    "ytdl-core": "0.23.0"
+  },
+  "description": "Command line utility to download music from YouTube",
+  "devDependencies": {
+    "eslint": "5.3.0",
+    "eslint-config-aqua": "4.3.0"
+  },
+  "keywords": [
+    "youtube",
+    "ytdl",
+    "music"
+  ],
+  "license": "Apache-2.0",
+  "main": "index.js",
+  "name": "music-downloader",
+  "scripts": {
+    "start": "node index.js",
+    "lint": "eslint ."
+  },
+  "version": "1.0.0"
+}