wip: {{else}} is a keyword and not a helper call

src/languages/handlebars.js

@@ -10,7 +10,7 @@ function (hljs) {
 
   var BUILT_INS = {
     'builtin-name': 'action bindattr collection component concat debugger '
-      + 'each each-in else get hash if in input link-to loc log lookup '
+      + 'each each-in get hash if in input link-to loc log lookup '
       + 'mut outlet partial query-params render template textarea unbound '
       + 'unless view with yield'
   };
@@ -138,6 +138,10 @@ function (hljs) {
         begin: /\{\{#/, end: /\}\}/,
         contains: [OPENING_BLOCK_MUSTACHE_CONTENTS],
       },
+      {
+        className: 'keyword',
+        begin: /\{\{else\}\}/
+      },
       {
         // closing block statement
         className: 'template-tag',

test/markup/handlebars/else-variants.expect.txt

@@ -0,0 +1,14 @@
+<span class="xml">Multiple possibilities of using "else":
+
+</span><span class="hljs-template-tag">{{#<span class="hljs-name">helper</span>}}</span><span class="hljs-keyword">{{else}}</span><span class="xml">else-block</span><span class="hljs-template-tag">{{/<span class="hljs-name">helper</span>}}</span><span class="xml">
+...
+</span><span class="hljs-template-tag">{{#<span class="hljs-name">helper</span>}}</span><span class="xml">block</span><span class="hljs-keyword">{{else}}</span><span class="xml">else-block</span><span class="hljs-template-tag">{{/<span class="hljs-name">helper</span>}}</span><span class="xml">
+...
+</span><span class="hljs-template-variable">{{<span class="hljs-name">[<span class="hljs-built_in">else</span>]</span>}}</span><span class="xml"> in brackets is a helper, not a keyword
+...
+</span><span class="hljs-template-tag">{{#<span class="hljs-name"><span class="hljs-built_in">else</span></span>}}</span><span class="xml"> as block helper name is not a keyword </span><span class="hljs-template-tag">{{/<span class="hljs-name"><span class="hljs-built_in">else</span></span>}}</span><span class="xml">
+...
+\{{else}} is not a keyword if escaped
+...
+Done
+</span>

test/markup/handlebars/else-variants.txt

@@ -0,0 +1,13 @@
+Multiple possibilities of using "else":
+
+{{#helper}}{{else}}else-block{{/helper}}
+...
+{{#helper}}block{{else}}else-block{{/helper}}
+...
+{{[else]}} in brackets is a helper, not a keyword
+...
+{{#else}} as block helper name is not a keyword {{/else}}
+...
+\{{else}} is not a keyword if escaped
+...
+Done