Fix conversion of multi-line method arguments

The regexps responsible for converting method calls with blocks did not
account for arguments split across multiple lines.  This patch enables
multi-line method arguments, as long as every line except the last ends
with a comma (and zero or more spaces).

lib/html2slim/converter.rb

@@ -19,7 +19,9 @@ def initialize(file)
       erb.gsub!(/<%(.+?)\s*\{\s*(\|.+?\|)?\s*%>/){ %(<%#{$1} do #{$2}%>) }
 
       # case, if, for, unless, until, while, and blocks...
-      erb.gsub!(/<%(-\s+)?((\s*(case|if|for|unless|until|while) .+?)|.+?do\s*(\|.+?\|)?\s*)-?%>/){ %(<ruby code="#{$2.gsub(/"/, '&quot;')}">) }
+      statement_start = /\s*(?:case|if|for|unless|until|while) .+?/
+      method_start = /.+?(?:,\s*\n.+?)*do\s*(?:\|.+?\|)?\s*/
+      erb.gsub!(/<%(?:-\s+)?(#{statement_start}|#{method_start})-?%>/){ %(<ruby code="#{$1.gsub(/"/, '&quot;')}">) }
       # else
       erb.gsub!(/<%-?\s*else\s*-?%>/, %(</ruby><ruby code="else">))
       # elsif

lib/html2slim/hpricot_monkeypatches.rb

@@ -73,7 +73,7 @@ def to_slim(lvl=0)
   private
 
   def slim_ruby_code(r)
-    (code.strip[0] == "=" ? "" : "- ") + code.strip.gsub(/\n/, "\n#{r}- ")
+    (code.strip[0] == "=" ? "" : "- ") + code.strip.gsub(/(?<!,)([ ]*\n)/, "\\1#{r}- ")
   end
 
   def code

test/fixtures/multiline_method_args.erb

@@ -0,0 +1,10 @@
+<%= form_with url: search_path,
+      class: "search-form",
+      method: :get do |form| %>
+  <div class="form-group">
+    <%= form.text_field :query,
+          class: "form-control" %>
+  </div>
+  <%= form.submit "Search",
+        class: "btn" %>
+<% end %>

test/fixtures/multiline_method_args.slim

@@ -0,0 +1,8 @@
+= form_with url: search_path,
+      class: "search-form",
+      method: :get do |form|
+  .form-group
+    = form.text_field :query,
+          class: "form-control"
+  = form.submit "Search",
+        class: "btn"

test/test_html2slim.rb

@@ -52,6 +52,12 @@ def test_convert_multiline_block
     end
   end
 
+  def test_convert_multiline_method_args
+    IO.popen("bin/erb2slim test/fixtures/multiline_method_args.erb -", "r") do |f|
+      assert_equal File.read("test/fixtures/multiline_method_args.slim"), f.read
+    end
+  end
+
   def test_convert_elsif_block
     IO.popen("bin/erb2slim test/fixtures/erb_elsif.erb -", "r") do |f|
       assert_equal File.read("test/fixtures/erb_elsif.slim"), f.read