code: def _get_file_by_alias(part, files):
      
      # Make Output
      if _is_output(part):
          return Output.from_string(part.pop())
  
      # Search/Make Input
      else:
          inputs = [[]]
  
          if part.magic_or:
              and_or = 'or'
          else:
              and_or = 'and'
  
          for cut in part.asList():
              if cut == OR_TOKEN:
                  inputs.append([])
                  continue
              if cut == AND_TOKEN:
                  continue
  
              input = Input(cut, filename=cut, and_or=and_or)
              for file in files:
                  if file.alias == cut:
                      # Override the filename
                      input.filename = file.filename
                      inputs[-1].append(input)
                      break
              else:
                  inputs[-1].append(input)
  
  
          return [input for input in inputs if input]
docs: Given a command part, find the file it represents. If not found,
      then returns a new token representing that file.
      :throws ValueError: if the value is not a command file alias.