code: def list_theme():
      
      from engineer.themes import ThemeManager
  
      themes = ThemeManager.themes()
      col1, col2 = map(max, zip(*[(len(t.id) + 2, len(t.root_path) + 2) for t in themes.itervalues()]))
  
      themes = ThemeManager.themes_by_finder()
      for finder in sorted(themes.iterkeys()):
          if len(themes[finder]) > 0:
              puts("%s: " % finder)
              for theme in sorted(themes[finder], key=lambda _: _.id):
                  with indent(4):
                      puts(
                          columns(
                              [colored.cyan("%s:" % theme.id), col1],
                              [colored.white(theme.root_path, bold=True), col2]
                          )
                      )
docs: List all available Engineer themes.