(settings, output, output_format=None,
                                 overwrite_output=None)
return result
Receives feed export params (from the 'crawl' or 'runspider' commands),
    checks for inconsistencies in their quantities and returns a dictionary
    suitable to be used as the FEEDS setting.
Receives feed export params (from the 'crawl' or 'runspider' commands),
    checks for inconsistencies in their quantities and returns a dictionary
    suitable to be used as the FEEDS setting.
Receives feed export params ( from the crawl or runspider commands ) checks for inconsistencies in their quantities and returns a dictionary suitable to be used as the FEEDS setting .
def feed_process_params_from_cli(settings, output, output_format=None,
                                 overwrite_output=None):
    """
    Receives feed export params (from the 'crawl' or 'runspider' commands),
    checks for inconsistencies in their quantities and returns a dictionary
    suitable to be used as the FEEDS setting.
    """
    valid_output_formats = without_none_values(
        settings.getwithbase('FEED_EXPORTERS')
    ).keys()

    def check_valid_format(output_format):
        if output_format not in valid_output_formats:
            raise UsageError(
                f"Unrecognized output format '{output_format}'. "
                f"Set a supported one ({tuple(valid_output_formats)}) "
                "after a colon at the end of the output URI (i.e. -o/-O "
                "<URI>:<FORMAT>) or as a file extension."
            )

    overwrite = False
    if overwrite_output:
        if output:
            raise UsageError(
                "Please use only one of -o/--output and -O/--overwrite-output"
            )
        output = overwrite_output
        overwrite = True

    if output_format:
        if len(output) == 1:
            check_valid_format(output_format)
            message = (
                'The -t command line option is deprecated in favor of '
                'specifying the output format within the output URI. See the '
                'documentation of the -o and -O options for more information.'
            )
            warnings.warn(message, ScrapyDeprecationWarning, stacklevel=2)
            return {output[0]: {'format': output_format}}
        else:
            raise UsageError(
                'The -t command-line option cannot be used if multiple output '
                'URIs are specified'
            )

    result = {}
    for element in output:
        try:
            feed_uri, feed_format = element.rsplit(':', 1)
        except ValueError:
            feed_uri = element
            feed_format = os.path.splitext(element)[1].replace('.', '')
        else:
            if feed_uri == '-':
                feed_uri = 'stdout:'
        check_valid_format(feed_format)
        result[feed_uri] = {'format': feed_format}
        if overwrite:
            result[feed_uri]['overwrite'] = True

    # FEEDS setting should take precedence over the matching CLI options
    result.update(settings.getdict('FEEDS'))

    return result
def feed_process_params_from_cli ( settings , output , output_format = None , overwrite_output = None ) : valid_output_formats = without_none_values ( settings . getwithbase ( 'FEED_EXPORTERS' ) ) . keys ( ) def check_valid_format ( output_format ) : if output_format not in valid_output_formats : raise UsageError ( f"Unrecognized output format '{output_format}'. " f"Set a supported one ({tuple(valid_output_formats)}) " "after a colon at the end of the output URI (i.e. -o/-O " "<URI>:<FORMAT>) or as a file extension." ) overwrite = False if overwrite_output : if output : raise UsageError ( "Please use only one of -o/--output and -O/--overwrite-output" ) output = overwrite_output overwrite = True if output_format : if len ( output ) == 1 : check_valid_format ( output_format ) message = ( 'The -t command line option is deprecated in favor of ' 'specifying the output format within the output URI. See the ' 'documentation of the -o and -O options for more information.' ) warnings . warn ( message , ScrapyDeprecationWarning , stacklevel = 2 ) return { output [ 0 ] : { 'format' : output_format } } else : raise UsageError ( 'The -t command-line option cannot be used if multiple output ' 'URIs are specified' ) result = { } for element in output : try : feed_uri , feed_format = element . rsplit ( ':' , 1 ) except ValueError : feed_uri = element feed_format = os . path . splitext ( element ) [ 1 ] . replace ( '.' , '' ) else : if feed_uri == '-' : feed_uri = 'stdout:' check_valid_format ( feed_format ) result [ feed_uri ] = { 'format' : feed_format } if overwrite : result [ feed_uri ] [ 'overwrite' ] = True # FEEDS setting should take precedence over the matching CLI options result . update ( settings . getdict ( 'FEEDS' ) ) return result