allow setting source for "hma"

Author: Haehnchen

src/utils/indicators.js

@@ -133,7 +133,7 @@ function executeTulindIndicator(source, indicator, tulindOptions) {
 
 module.exports = {
   // indicators which source is Candles
-  sourceCandle: ['cci', 'pivot_points_high_low', 'obv', 'ao', 'mfi', 'stoch', 'vwma', 'atr', 'adx', 'volume_profile', 'volume_by_price', 'ichimoku_cloud', 'zigzag', 'wicked', 'heikin_ashi', 'psar'],
+  sourceCandle: ['cci', 'pivot_points_high_low', 'obv', 'ao', 'mfi', 'stoch', 'vwma', 'atr', 'adx', 'volume_profile', 'volume_by_price', 'ichimoku_cloud', 'zigzag', 'wicked', 'heikin_ashi', 'psar', 'hma'],
 
   bb: (source, indicator) => 
     executeTulindIndicator(source, indicator, {
@@ -148,10 +148,17 @@ module.exports = {
   sma: (...args) => executeTulindIndicator(...args, { options: { length: 14 } }),
   ema: (...args) => executeTulindIndicator(...args, { options: { length: 14 } }),
   rsi: (...args) => executeTulindIndicator(...args, { options: { length: 14 } }),
-  hma: (...args) => executeTulindIndicator(...args, { options: { length: 9 } }),
   roc: (...args) => executeTulindIndicator(...args, { options: { length: 6 } }),
   atr: (...args) => executeTulindIndicator(...args, { sources: ['high', 'low', 'close'], options: { length: 14 } }),
 
+  hma: (source, indicator) => {
+    let candleSource = (indicator.options && indicator.options.source) || 'close'
+
+    return executeTulindIndicator(source, indicator, {
+      sources: [candleSource],
+      options: { length: 9 }
+    })},
+
   cci: (...args) =>
     executeTulindIndicator(...args, {
       sources: ['high', 'low', 'close'],

test/utils/technical_analysis.test.js

@@ -118,7 +118,11 @@ describe('#technical_analysis for candles', () => {
       },
       {
         indicator: 'hma',
-        key: 'hma'
+        key: 'hma',
+        options: {
+          length: 9,
+          source: 'low'
+        }
       },
       {
         indicator: 'vwma',