old_contents: from i3pystatus import IntervalModule
  from i3pystatus.core.command import run_through_shell
  import logging
  
  # logger = logging.getLogger(__name__)
  
  
  class Shell(IntervalModule):
      """
      Shows output of shell command
  
      .. rubric:: Available formatters
      * `{output}` — just the striped command output without newlines
      """
  
      color = "#FFFFFF"
      error_color = "#FF0000"
  
      settings = (
          ("command", "command to be executed"),
          ("color", "standard color"),
          ("error_color", "color to use when non zero exit code is returned"),
          "format"
      )
  
      required = ("command",)
      format = "{output}"
  
      def run(self):
          retvalue, out, stderr = run_through_shell(self.command, enable_shell=True)
  
          if retvalue != 0:
              self.logger.error(stderr if stderr else "Unknown error")
  
          if out:
              out = out.replace("\n", " ").strip()
          elif stderr:
              out = stderr
  
          self.output = {
              "full_text": self.format.format(output=out) if out else "Command `%s` returned %d" % (self.command, retvalue),
              "color": self.color if retvalue == 0 else self.error_color
          }
  
new_contents: from i3pystatus import IntervalModule
  from i3pystatus.core.command import run_through_shell
  import logging
  
  
  class Shell(IntervalModule):
      """
      Shows output of shell command
  
      .. rubric:: Available formatters
  
      * `{output}` — just the striped command output without newlines
      """
  
      color = "#FFFFFF"
      error_color = "#FF0000"
  
      settings = (
          ("command", "command to be executed"),
          ("color", "standard color"),
          ("error_color", "color to use when non zero exit code is returned"),
          "format"
      )
  
      required = ("command",)
      format = "{output}"
  
      def run(self):
          retvalue, out, stderr = run_through_shell(self.command, enable_shell=True)
  
          if retvalue != 0:
              self.logger.error(stderr if stderr else "Unknown error")
  
          if out:
              out = out.replace("\n", " ").strip()
          elif stderr:
              out = stderr
  
          self.output = {
              "full_text": self.format.format(output=out) if out else "Command `%s` returned %d" % (self.command, retvalue),
              "color": self.color if retvalue == 0 else self.error_color
          }
  
subject: fix docs build error