code: def compile_theme(theme_id=None):
      
      from engineer.processors import convert_less
      from engineer.themes import ThemeManager
  
      if theme_id is None:
          themes = ThemeManager.themes().values()
      else:
          themes = [ThemeManager.theme(theme_id)]
  
      with(indent(2)):
          puts(colored.yellow("Compiling %s themes." % len(themes)))
  
          for theme in themes:
              theme_output_path = (theme.static_root / ('stylesheets/%s_precompiled.css' % theme.id)).normpath()
  
              puts(colored.cyan("Compiling theme %s to %s" % (theme.id, theme_output_path)))
              with indent(4):
                  puts("Compiling...")
                  convert_less(theme.static_root / ('stylesheets/%s.less' % theme.id),
                               theme_output_path,
                               minify=True)
                  puts(colored.green("Done.", bold=True))
docs: Compiles a theme.