Merge f158bbcdd7 into f20714da1e

src/cli/options.js

@@ -274,6 +274,11 @@ const OPTIONS = {
     choices: ['first', 'spread', 'random'],
     'default': 'first'
   },
+  'album-covers': {
+    group: 'Album options:',
+    description: 'Optional overrides for album previews',
+    type: 'string'
+  },
 
   // ------------------------------------
   // Website options

src/model/album.js

@@ -122,6 +122,21 @@ Album.prototype.sort = function (options) {
 }
 
 Album.prototype.pickPreviews = function (options) {
+  // Read in the optional covers.
+  if (options.albumCovers) {
+    const covers = require(options.albumCovers)
+    if(covers[this.basename]) {
+      let count = 0
+      do {
+        if (this.files[count].path === covers[this.basename]) {
+          this.previews = [this.files[count]]
+        }
+        count = count + 1
+      } while (!this.previews || count < this.files.length)
+    }
+  }
+
+  if (!this.previews) {
     // consider nested albums if there aren't enough photos
     var potential = this.files
     if (potential.length < PREVIEW_COUNT) {
@@ -144,6 +159,7 @@ Album.prototype.pickPreviews = function (options) {
     } else {
       throw new Error(`Unsupported preview type: ${options.albumPreviews}`)
     }
+  }
 
   // and fill any gap with a placeholder
   var missing = PREVIEW_COUNT - this.previews.length