adding #12

src/factories/media.js

@@ -4,6 +4,7 @@ const sharp = require('sharp')
 const mkdirp = require('mkdirp')
 const crypto = require('crypto')
 const slugify = require('slugify')
+const assign = require('assign-deep')
 
 const configStore = require('./../config.js')
 
@@ -142,16 +143,34 @@ class Media {
      */
     _writeFile(file, process, options) {
 
-        // resize without options and with options
+        // if sizes have height or width with no optional parameters then check for merge of options 
-        if (file.sizes && Object.getOwnPropertyNames(options).length === 0 && Object.getOwnPropertyNames(file.sizes).length > 0) {
+        if (file.sizes &&
+             (((!file.sizes.height || !file.sizes.width) && Object.getOwnPropertyNames(file.sizes).length === 1) ||
+             (file.sizes.height && file.sizes.width && Object.getOwnPropertyNames(file.sizes).length === 2))) {
+            process.resize(this._mergeOptions(file.sizes, options))
+        
+        // if already options in sizes ignore options
+        } else if (file.sizes) {
             process.resize(file.sizes)
-        } else if (file.sizes && Object.getOwnPropertyNames(options).length > 0 && Object.getOwnPropertyNames(file.sizes).length > 0) {
-            process.resize(file.sizes, options)
         }
 
         process.toFile(configStore.get('destination') + file.path)
     }
 
+    /**
+     *  if options are exists merge them with sizes
+     * 
+     *  @param  {object} sizes
+     *  @param  {Object} options
+     */
+    _mergeOptions(sizes, options) {
+        if (Object.getOwnPropertyNames(options).length > 0) {
+            sizes = assign(options, sizes)
+        }
+
+        return sizes
+    }
+
     /**
      *  generate destination path from hash of file 
      *