add snippet to convert rails 2.3 views to 3.0

lib/rails/convert_views_2_3_to_3_0.rb

@@ -0,0 +1,37 @@
+Synvert::Rewriter.new 'convert_views_2_3_to_3_0' do
+  description <<-EOF
+1. remove h helper, rails 3 uses it by default.
+
+    <%= h user.login %> => <%= user.login %>
+
+2. use erb expression instead of erb statement for view helpers.
+
+    <% form_for post do |f| %>
+    <% end %>
+    =>
+    <%= form_for post do |f| %>
+    <% end %>
+  EOF
+
+  %w(app/views/**/*.html.erb app/helpers/**/*.rb).each do |file_pattern|
+    # <%= h user.login %> => <%= user.login %>
+    within_files file_pattern do
+      with_node type: 'send', receiver: nil, message: 'h' do
+        replace_with "{{arguments}}"
+      end
+    end
+
+    %w(form_for form_tag).each do |message|
+      # <% form_for post do |f| %>
+      # <% end %>
+      # =>
+      # <%= form_for post do |f| %>
+      # <% end %>
+      within_files file_pattern do
+        with_node type: 'block', caller: {type: 'send', receiver: nil, message: message} do
+          replace_erb_stmt_with_expr
+        end
+      end
+    end
+  end
+end

spec/rails/convert_routes_2_3_to_3_0_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe 'Convert rails queries from 2.3 to 3.0' do
+describe 'Convert rails routes from 2.3 to 3.0' do
   before do
     rewriter_path = File.join(File.dirname(__FILE__), '../../lib/rails/convert_routes_2_3_to_3_0.rb')
     @rewriter = eval(File.read(rewriter_path))

spec/rails/convert_views_2_3_to_3_0_spec.rb

@@ -0,0 +1,38 @@
+# encoding: utf-8
+
+require 'spec_helper'
+
+describe 'Convert rails views from 2.3 to 3.0' do
+  before do
+    rewriter_path = File.join(File.dirname(__FILE__), '../../lib/rails/convert_views_2_3_to_3_0.rb')
+    @rewriter = eval(File.read(rewriter_path))
+  end
+
+  describe 'with fakefs', fakefs: true do
+    let(:posts_show_content) {"""
+  <%= h user.login %>
+  <%= post.title %>
+
+  <% form_for post, :html => {:id => 'post-form'} do |f| %>
+  <% end %>
+  <%= form_for post do |f| %>
+  <% end %>
+    """}
+    let(:posts_show_rewritten_content) {"""
+  <%= user.login %>
+  <%= post.title %>
+
+  <%= form_for post, :html => {:id => 'post-form'} do |f| %>
+  <% end %>
+  <%= form_for post do |f| %>
+  <% end %>
+    """}
+
+    it 'converts' do
+      FileUtils.mkdir_p 'app/views/posts'
+      File.write 'app/views/posts/show.html.erb', posts_show_content
+      @rewriter.process
+      expect(File.read 'app/views/posts/show.html.erb').to eq posts_show_rewritten_content
+    end
+  end
+end