Add currency units from #1910.

public/app/components/kbn.js

@@ -298,6 +298,18 @@ function($, _) {
     return kbn.formatBuilders.scaledUnits(1024, units);
   };
 
+  // Currency formatter for prefixing a symbol onto a number. Supports scaling
+  // up to the trillions.
+  kbn.formatBuilders.currency = function(symbol) {
+    var units = ['', 'K', 'M', 'B', 'T'];
+    var scaler = kbn.formatBuilders.scaledUnits(1000, units);
+    return function(size, decimals, scaledDecimals) {
+      if (size === null) { return ""; }
+      var scaled = scaler(size, decimals, scaledDecimals);
+      return symbol + scaled;
+    };
+  };
+
   ///// VALUE FORMATS /////
 
   // Dimensionless Units
@@ -316,6 +328,10 @@ function($, _) {
     return kbn.toFixed(100*size, decimals) + '%';
   };
 
+  // Currencies
+  kbn.valueFormats.currencyUSD = kbn.formatBuilders.currency('$');
+  kbn.valueFormats.currencyGBP = kbn.formatBuilders.currency('£');
+
   // Data
   kbn.valueFormats.bits   = kbn.formatBuilders.binarySIPrefix('b');
   kbn.valueFormats.bytes  = kbn.formatBuilders.binarySIPrefix('B');
@@ -472,6 +488,13 @@ function($, _) {
         ]
       },
       {
+        text: 'currency',
+        submenu: [
+          {text: 'Dollars ($)', value: 'currencyUSD'},
+          {text: 'Pounds (£)',  value: 'currencyGBP'},
+        ]
+      },
+      {
         text: 'time',
         submenu: [
           {text: 'Hertz (1/s)',       value: 'hertz'},

public/test/specs/kbn-format-specs.js

@@ -53,6 +53,10 @@ define([
   describeValueFormat('percentunit', 0.278, 0, 1, '27.8%');
   describeValueFormat('percentunit', 1.0, 0, 0, '100%');
 
+  describeValueFormat('currencyUSD', 7.42, 10000, 2, '$7.42');
+  describeValueFormat('currencyUSD', 1532.82, 1000, 1, '$1.53K');
+  describeValueFormat('currencyUSD', 18520408.7, 10000000, 0, '$19M');
+
   describeValueFormat('bytes', -1.57e+308, -1.57e+308, 2, 'NA');
 
   describeValueFormat('ns', 25, 1, 0, '25 ns');