Refactor Handlebars helpers.

src/eng/handlebars-helpers.js

@@ -0,0 +1,76 @@
+/**
+Template helper definitions for Handlebars.
+@license MIT. Copyright (c) 2015 James Devlin / FluentDesk.
+@module handlebars-helpers.js
+*/
+
+
+(function() {
+
+  var HANDLEBARS = require('handlebars')
+  , MD = require('marked')
+  , H2W = require('../utils/html-to-wpml')
+  , moment = require('moment');
+
+  /**
+  Register useful Handlebars helpers.
+  @method registerHelpers
+  */
+  module.exports = function() {
+
+    // Set up a date formatting helper so we can do:
+    // {{formatDate val 'YYYY-MM'}}
+    HANDLEBARS.registerHelper("formatDate", function(datetime, format) {
+      return moment ? moment( datetime ).format( format ) : datetime;
+    });
+
+    // Set up a Markdown-to-WordProcessingML helper so we can do:
+    // {{wmpl val [true|false]}}
+    HANDLEBARS.registerHelper("wpml", function( txt, inline ) {
+      if(!txt) return '';
+      inline = (inline && !inline.hash) || false;
+      txt = inline ?
+        MD(txt.trim()).replace(/^\s*<p>|<\/p>\s*$/gi, '') :
+        MD(txt.trim());
+      txt = H2W( txt.trim() );
+      return txt;
+    });
+
+    // Set up a last-word helper so we can do:
+    // {{lastWord val [true|false]}}
+    HANDLEBARS.registerHelper("lastWord", function( txt ) {
+      return txt && txt.trim() ? _.last( txt.split(' ') ) : '';
+    });
+
+    // Set up a Markdown-to-WordProcessingML helper so we can do:
+    // {{initialWords val [true|false]}}
+    HANDLEBARS.registerHelper("initialWords", function( txt ) {
+      return txt && txt.trim() ? _.initial( txt.split(' ') ).join(' ') : '';
+    });
+
+    // Set up a generic conditional helper so we can do:
+    // {{compare val otherVal operator="<"}}
+    // http://doginthehat.com.au/2012/02/comparison-block-helper-for-handlebars-templates/
+    HANDLEBARS.registerHelper('compare', function(lvalue, rvalue, options) {
+      if (arguments.length < 3)
+        throw new Error("Handlerbars Helper 'compare' needs 2 parameters");
+      var operator = options.hash.operator || "==";
+      var operators = {
+          '==':       function(l,r) { return l == r; },
+          '===':      function(l,r) { return l === r; },
+          '!=':       function(l,r) { return l != r; },
+          '<':        function(l,r) { return l < r; },
+          '>':        function(l,r) { return l > r; },
+          '<=':       function(l,r) { return l <= r; },
+          '>=':       function(l,r) { return l >= r; },
+          'typeof':   function(l,r) { return typeof l == r; }
+      };
+      if (!operators[operator])
+        throw new Error("Handlerbars Helper 'compare' doesn't know the operator "+operator);
+      var result = operators[operator](lvalue,rvalue);
+      return result ? options.fn(this) : options.inverse(this);
+    });
+
+  };
+
+}());