From 95f311523e9c8166acb1be4d0175dca25074deb0 Mon Sep 17 00:00:00 2001
From: Nathan Weizenbaum <nex342@gmail.com>
Date: Wed, 25 Nov 2009 20:04:04 -0800
Subject: [PATCH] [Haml] Allow - if with no content to be followed by - else
 with content.

Closes gh-62
---
 doc-src/HAML_CHANGELOG.md |  9 +++++++++
 lib/haml/precompiler.rb   |  8 +++++++-
 test/haml/engine_test.rb  | 10 ++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/doc-src/HAML_CHANGELOG.md b/doc-src/HAML_CHANGELOG.md
index bc24d465..33d5a9d6 100644
--- a/doc-src/HAML_CHANGELOG.md
+++ b/doc-src/HAML_CHANGELOG.md
@@ -3,6 +3,15 @@
 * Table of contents
 {:toc}
 
+## 2.2.15 (Unreleased)
+
+* Allow `if` statements with no content followed by `else` clauses.
+  For example:
+
+    - if foo
+    - else
+      bar
+
 ## [2.2.14](http://github.com/nex3/haml/commit/2.2.14)
 
 * Don't print warnings when escaping attributes containing non-ASCII characters
diff --git a/lib/haml/precompiler.rb b/lib/haml/precompiler.rb
index dd461450..a7dadb01 100644
--- a/lib/haml/precompiler.rb
+++ b/lib/haml/precompiler.rb
@@ -246,7 +246,13 @@ END
         # It's important to preserve tabulation modification for keywords
         # that involve choosing between posible blocks of code.
         if %w[else elsif when].include?(keyword)
-          @dont_indent_next_line, @dont_tab_up_next_text = @to_close_stack.last[1..2]
+          # @to_close_stack may not have a :script on top
+          # when the preceding "- if" has nothing nested
+          if @to_close_stack.last && @to_close_stack.last.first == :script
+            @dont_indent_next_line, @dont_tab_up_next_text = @to_close_stack.last[1..2]
+          else
+            push_and_tabulate([:script, @dont_indent_next_line, @dont_tab_up_next_text])
+          end
 
           # when is unusual in that either it will be indented twice,
           # or the case won't have created its own indentation
diff --git a/test/haml/engine_test.rb b/test/haml/engine_test.rb
index a63f1dce..073ce7b6 100644
--- a/test/haml/engine_test.rb
+++ b/test/haml/engine_test.rb
@@ -581,6 +581,16 @@ HTML
 HAML
   end
 
+  def test_if_without_content_and_else
+    assert_equal(<<HTML, render(<<HAML))
+foo
+HTML
+- if false
+- else
+  foo
+HAML
+  end
+
   # HTML escaping tests
 
   def test_ampersand_equals_should_escape