Extract cover art

package.json

@@ -1,6 +1,6 @@
 {
   "name": "publikator",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "main": "index.js",
   "repository": "https://github.com/aengl/publikator.git",
   "author": "Lynn Smeria <ae@cephea.de>",
@@ -12,11 +12,13 @@
     "node": ">=8"
   },
   "dependencies": {
+    "@types/mime-types": "2.1.0",
     "caporal": "0.10.0",
     "debug": "3.1.0",
     "fs-extra": "7.0.0",
     "js-yaml": "3.12.0",
     "lodash": "4.17.10",
+    "mime-types": "2.1.19",
     "music-metadata": "2.6.0",
     "sanitize-filename": "1.6.1",
     "walkdir": "0.0.12"

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.
    */

yarn.lock

@@ -2,6 +2,10 @@
 # yarn lockfile v1
 
 
+"@types/mime-types@2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@types/mime-types/-/mime-types-2.1.0.tgz#9ca52cda363f699c69466c2a6ccdaad913ea7a73"
+
 abbrev@1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
@@ -1592,6 +1596,16 @@ micromist@^1.0.1:
   dependencies:
     lodash.camelcase "^4.3.0"
 
+mime-db@~1.35.0:
+  version "1.35.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.35.0.tgz#0569d657466491283709663ad379a99b90d9ab47"
+
+mime-types@2.1.19:
+  version "2.1.19"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.19.tgz#71e464537a7ef81c15f2db9d97e913fc0ff606f0"
+  dependencies:
+    mime-db "~1.35.0"
+
 mimic-fn@^1.0.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"