From 28d50c190f9e399f0fe5cb142509f24dd36bc76b Mon Sep 17 00:00:00 2001
From: Logan Wright <logan.william.wright@gmail.com>
Date: Thu, 1 Sep 2016 11:58:08 -0400
Subject: [PATCH] evaluate non-nil as true in if tag

---
 Sources/Leaf/Tag/Models/If.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sources/Leaf/Tag/Models/If.swift b/Sources/Leaf/Tag/Models/If.swift
index de69045..6120104 100644
--- a/Sources/Leaf/Tag/Models/If.swift
+++ b/Sources/Leaf/Tag/Models/If.swift
@@ -20,6 +20,9 @@ public final class If: Tag {
         tagTemplate: TagTemplate,
         arguments: [Argument],
         value: Node?) -> Bool {
-        return arguments.first?.value?.bool == true
+        guard let value = arguments.first?.value else { return false }
+        // Existence of bool, evaluate bool. Otherwise, not-nil returns true.
+        guard let bool = value.bool else { return true }
+        return bool
     }
 }