Merge pull request #80 from posgarou/features/batch_convert_erb

Add rake task to batch convert all .erb views to .haml

Author: indirect

README.md

@@ -25,6 +25,18 @@ After the application layout file is converted successfully,
 make sure to delete `app/views/layouts/application.html.erb`, so Rails can
 start using `app/views/layouts/application.html.haml` instead.
 
+### Converting all .erb views to haml format
+
+If you want to convert all of your .erb views into .haml, you can do so using the following command:
+
+    $ rake haml:erb2haml
+
+If you already have .haml files for one or more of the .erb files, the rake task will give you the option of either
+replacing these .haml files or leaving them in place.
+
+Once the task is complete, you will have the option of deleting the original .erb files. Unless you are under
+version control, it is recommended that you decline this option.
+
 ### Older versions of Rails
 
 The current version of Haml-rails requires 4.0.1 or later.

lib/tasks/erb2haml.rake

@@ -0,0 +1,76 @@
+namespace :haml do
+  task :erb_2_haml do
+
+    puts "This task will generate a .html.haml translation of each of the  .html.erb files in app/views and its subdirectories."
+
+    erb_files = Dir.glob('app/views/**/*.erb').select { |f| File.file? f}
+    haml_files = Dir.glob('app/views/**/*.haml').select { |f| File.file? f}
+
+    if erb_files.empty?
+      puts "No .erb files found. Task will now exit."
+      exit
+    end
+
+    haml_files_w_out_ext = haml_files.map { |f| f.gsub(/\.haml\z/, '') }
+
+    # Get a list of all those erb files that already seem to have .haml equivalents
+
+    already_existing = erb_files.select { |f| short = f.gsub(/\.erb\z/, ''); haml_files_w_out_ext.include?(short) }
+
+    puts '-'*80
+
+    if already_existing.any?
+      puts "Some of your .html.erb files seem to already have .haml equivalents:"
+      already_existing.map { |f| puts "\t#{f}" }
+
+      # Ask the user whether he/she would like to overwrite them.
+      begin
+        puts "Would you like to overwrite these .haml files? (y/n)"
+        should_overwrite = STDIN.gets.chomp.downcase[0]
+      end until ['y', 'n'].include?(should_overwrite)
+      puts '-'*80
+
+      # If we are not overwriting, remove each already_existing from our erb_files list
+      if should_overwrite == 'n'
+        erb_files = erb_files - already_existing
+
+        if erb_files.empty?
+          # It is possible no .erb files remain, after we remove already_existing
+          puts "No .erb files remain. Task will now exit."
+          return
+        end
+      else
+        # Delete the current .haml
+        already_existing.each { |f| File.delete(f.gsub(/\.erb\z/, '.haml')) }
+      end
+    end
+
+    erb_files.each do |file|
+      puts "Generating HAML for #{file}..."
+      `html2haml #{file} #{file.gsub(/\.erb\z/, '.haml')}`
+    end
+
+    puts '-'*80
+
+    puts "HAML generated for the following files:"
+    erb_files.each do |file|
+      puts "\t#{file}"
+    end
+
+    puts '-'*80
+    begin
+      puts 'Would you like to delete the original .erb files? (This is not recommended unless you are under version control.) (y/n)'
+      should_delete = STDIN.gets.chomp.downcase[0]
+    end until ['y', 'n'].include?(should_delete)
+
+    if should_delete == 'y'
+      puts "Deleting original .erb files."
+      File.delete *erb_files
+    else
+      puts "Please remember to delete your .erb files once you have ensured they were translated correctly."
+    end
+
+    puts '-'*80
+    puts "Task complete!"
+  end
+end