Extract cover art

src/organise.js

@@ -3,14 +3,35 @@ const path = require('path');
 const _ = require('lodash');
 const sanitize = require('sanitize-filename');
 const debug = require('debug')('publikator:organise');
+const mime = require('mime-types');
 const tags = require('./tags');
 
 const getFolderName = file => file.common.album.replace(/ /g, '_');
+
 const getFileName = file =>
   `${file.common.track.no}-${file.common.title}${path.extname(
     file.path
   )}`.replace(/ /g, '_');
 
+/**
+ * Extracts the cover art and saves it to a file with the same name.
+ */
+const extractCoverArt = async filePath => {
+  const pictures = await tags.extractCoverArt(filePath);
+  if (pictures) {
+    await Promise.all(
+      pictures.map(async picture => {
+        const pictureExt = mime.extension(picture.format);
+        const picturePath = `${filePath.replace(
+          path.extname(filePath),
+          ''
+        )}.${pictureExt}`;
+        await fs.writeFile(picturePath, picture.data);
+      })
+    );
+  }
+};
+
 module.exports = {
   /**
    * Organises tracks into a new folder structure in `root`, as follows:
@@ -42,13 +63,14 @@ module.exports = {
       folders.map(album => fs.ensureDir(path.resolve(root, sanitize(album))))
     );
 
-    debug(`copying tracks`);
+    debug(`copying tracks & extracting covers`);
     return Promise.all(
       files.map(async file => {
         const folderName = getFolderName(file);
         const fileName = getFileName(file);
         const newPath = path.resolve(root, folderName, fileName);
         await fs.copyFile(file.path, newPath);
+        await extractCoverArt(newPath);
         return _.assign(
           {},
           {

src/tags.js

@@ -10,9 +10,21 @@ module.exports = {
     mm.parseFile(file, {
       duration: true,
       native: true,
-      skipCovers: false,
+      skipCovers: true,
     }),
 
+  /**
+   * Extracts the cover art into a file stream.
+   */
+  extractCoverArt: async file => {
+    const data = await mm.parseFile(file, {
+      duration: false,
+      native: false,
+      skipCovers: false,
+    });
+    return data.common.picture;
+  },
+
   /**
    * Returns true if a file has all required tags.
    */