Move helpers into separate modules

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/handlebars/helpers/if.js b/lib/handlebars/helpers/if.js
new file mode 100644
index 0000000..11d08df
--- /dev/null
+++ b/lib/handlebars/helpers/if.js
@@ -0,0 +1,20 @@
+import {isEmpty, isFunction} from '../utils';
+
+export default function(instance) {
+  instance.registerHelper('if', function(conditional, options) {
+    if (isFunction(conditional)) { conditional = conditional.call(this); }
+
+    // Default behavior is to render the positive path if the value is truthy and not empty.
+    // The `includeZero` option may be set to treat the condtional as purely not empty based on the
+    // behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.
+    if ((!options.hash.includeZero && !conditional) || isEmpty(conditional)) {
+      return options.inverse(this);
+    } else {
+      return options.fn(this);
+    }
+  });
+
+  instance.registerHelper('unless', function(conditional, options) {
+    return instance.helpers['if'].call(this, conditional, {fn: options.inverse, inverse: options.fn, hash: options.hash});
+  });
+}