move layout colorscale attributes into its own file

Author: antoinerg

src/components/colorscale/index.js

@@ -15,6 +15,8 @@ exports.defaultScale = require('./default_scale');
 
 exports.attributes = require('./attributes');
 
+exports.layoutAttributes = require('./layout_attributes');
+
 exports.handleDefaults = require('./defaults');
 
 exports.calc = require('./calc');

src/components/colorscale/layout_attributes.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright 2012-2018, Plotly, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+
+'use strict';
+
+var scales = require('./scales');
+
+module.exports = {
+    editType: 'calc',
+    sequential: {
+        valType: 'colorscale',
+        dflt: scales.Reds,
+        role: 'style',
+        editType: 'calc',
+        description: 'Sets the default sequential colorscale for positive values.'
+    },
+    sequentialminus: {
+        valType: 'colorscale',
+        dflt: scales.Blues,
+        role: 'style',
+        editType: 'calc',
+        description: 'Sets the default sequential colorscale for negative values.'
+    },
+    diverging: {
+        valType: 'colorscale',
+        dflt: scales.RdBu,
+        role: 'style',
+        editType: 'calc',
+        description: 'Sets the default diverging colorscale.'
+    }
+};

src/plots/layout_attributes.js

@@ -10,6 +10,7 @@
 
 var fontAttrs = require('./font_attributes');
 var colorAttrs = require('../components/color/attributes');
+var colorscaleAttrs = require('../components/colorscale/layout_attributes');
 
 var globalFont = fontAttrs({
     editType: 'calc',
@@ -188,30 +189,7 @@ module.exports = {
         editType: 'calc',
         description: 'Sets the default trace colors.'
     },
-    colorscale: {
-        editType: 'calc',
-        sequential: {
-            valType: 'colorscale',
-            dflt: false,
-            role: 'style',
-            editType: 'calc',
-            description: 'Sets the default sequential colorscale for positive values.'
-        },
-        sequentialminus: {
-            valType: 'colorscale',
-            dflt: false,
-            role: 'style',
-            editType: 'calc',
-            description: 'Sets the default sequential colorscale for negative values.'
-        },
-        diverging: {
-            valType: 'colorscale',
-            dflt: false,
-            role: 'style',
-            editType: 'calc',
-            description: 'Sets the default diverging colorscale.'
-        }
-    },
+    colorscale: colorscaleAttrs,
     datarevision: {
         valType: 'any',
         role: 'info',