added tests and src code in one file .. ugh

hobo/lib/hobo/dryml/tag_extractor.rb

@@ -0,0 +1,58 @@
+module Hobo; end
+module Hobo::Dryml
+  # Extracts the original definition of a tag from its source file
+  # Initially, only extracts from taglibs within HOBO_ROOT
+  def self.extract_tag(name)
+    base_dir = "#{HOBO_ROOT}/taglibs"
+    all_dryml_files = Dir[base_dir + "/**/*.dryml"]
+    for file in all_dryml_files
+      contents = File.read(file).split("\n")
+      start_index, end_index, def_count = nil, contents.length - 1, 0
+      contents.each_with_index do |line, index|
+        if line =~ /<def tag="#{name}"/
+          start_index = index
+        end
+        if start_index
+          def_count += 1 if line =~ /<def/
+          def_count -= 1 if line =~ %r{</def}
+          if def_count == 0
+            end_index = index
+            return contents[start_index..end_index].join("\n")
+          end
+        end
+      end
+    end
+    nil
+  end
+end
+
+# To run tests, execute this source file
+if __FILE__==$0
+  require 'test/unit'
+  HOBO_ROOT = File.dirname(__FILE__) + "/../../.."
+
+  class TagExtractorTest < Test::Unit::TestCase
+    def test_should_find_one_line_tag
+      tag_src = Hobo::Dryml.extract_tag('item')
+      expected = '<def tag="item"><% scope.items << parameters.default %></def>'
+      assert_not_nil(tag_src)
+      assert_equal(expected, tag_src)
+    end
+
+    def test_should_find_multiline_tag
+      tag_src = Hobo::Dryml.extract_tag('image')
+      expected = <<-TAG.strip
+<def tag="image" attrs="src">
+  <img src="\#{base_url}/images/\#{src}" merge-attrs/>
+</def>
+TAG
+      assert_not_nil(tag_src)
+      assert_equal(expected, tag_src)
+    end
+
+    def test_should_not_find_xxx
+      tag_src = Hobo::Dryml.extract_tag('xxx')
+      assert_nil(tag_src)
+    end
+  end
+end