init.coffee for Atom

init.coffee

atom.workspace.observeTextEditors (editor) ->
  path = editor.getPath()
  return unless path?

  fileTypes =
    '.html.erb': 'text.html.ruby',
    '.rb': 'source.ruby.rails'

  for extension of fileTypes when \
      path.toLowerCase().endsWith(extension.toLowerCase()) and
      (longestExtension ? "").length < extension.length
    longestExtension = extension

  return unless longestExtension?
  g = atom.grammars.grammarForScopeName fileTypes[longestExtension]
  return unless g?
  editor.setGrammar g