feat(unless_block): support else

fixes #283

src/tags/if_block.rs

@@ -304,15 +304,33 @@ pub fn unless_block(
     options: &LiquidOptions,
 ) -> Result<Box<Renderable>> {
     let condition = parse_condition(arguments)?;
-    let if_true = Template::new(tokens.parse_all(options)?);
+
+    let mut if_true = Vec::new();
+    let mut if_false = None;
+
+    while let Some(element) = tokens.next()? {
+        match element {
+            BlockElement::Tag(mut tag) => match tag.name() {
+                "else" => {
+                    if_false = Some(tokens.parse_all(options)?);
+                    break;
+                }
+                _ => if_true.push(tag.parse(&mut tokens, options)?),
+            },
+            element => if_true.push(element.parse(&mut tokens, options)?),
+        }
+    }
+
+    let if_true = Template::new(if_true);
+    let if_false = if_false.map(Template::new);
 
     tokens.assert_empty();
     Ok(Box::new(Conditional {
         tag_name: "unless",
         condition,
         mode: false,
         if_true,
-        if_false: None,
+        if_false,
     }))
 }
 

tests/conformance_ruby/tags/unless_else_tag_test.rs

@@ -41,7 +41,6 @@ fn test_unless_in_loop() {
 }
 
 #[test]
-#[ignore]
 fn test_unless_else_in_loop() {
     assert_template_result!(" TRUE  2  3 ", "{% for i in choices %}{% unless i %} {{ forloop.index }} {% else %} TRUE {% endunless %}{% endfor %}", v!({"choices": [1, nil, false]}));
 }