docs: def mk_tmpl(self, path, tmpl, ctx, mode=None):
          """Create a file from a template if it doesn't already exist.
          """
  
          path = os.path.abspath(path)
  
          if os.path.isfile(path):
              logger.warning("File %s already exists, not creating it.", tmpl)
  
          with open(path, 'w') as fd:
              fd.write(
                  tmpl.format(**ctx)
              )
              if mode:
                  os.chmod(path, mode)