docs: def gemset_list_all(runas=None):
      '''
      List all gemsets for all installed rubies.
  
      Note that you must have set a default ruby before this can work.
  
      runas
          The user under which to run rvm. If not specified, then rvm will be run
          as the user under which Salt is running.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' rvm.gemset_list_all
      '''
      gemsets = {}
      current_ruby = None
      output = _rvm_do('default', ['rvm', 'gemset', 'list_all'], runas=runas)
      if output:
          gems_regex = re.compile('^   ([^ ]+)')
          gemset_regex = re.compile('^gemsets for ([^ ]+)')
          for line in output.splitlines():
              match = gemset_regex.match(line)
              if match:
                  current_ruby = match.group(1)
                  gemsets[current_ruby] = []
              match = gems_regex.match(line)
              if match:
                  gemsets[current_ruby].append(match.group(1))
      return gemsets