#!/usr/bin/python3
__doc__ = """Output information about a fast-import stream.

This command reads a fast-import stream and outputs
statistics and interesting properties about what it finds.
When run in verbose mode, the information is output as a
configuration file that can be passed to fast-import to
assist it in intelligently caching objects.

To specify standard input as the input stream, use a source name
of '-'. If the source name ends in '.gz', it is assumed to be
compressed in gzip format.

:Examples:

 Display statistics about the import stream produced by front-end::

  front-end | fast-import-info -

 Create a hints file for running fast-import on a large repository::

   front-end | fast-import-info -v - > front-end.cfg
"""

import optparse
import sys

parser = optparse.OptionParser('fast-import-info [options] SOURCE')

parser.add_option('-v', '--verbose', dest="verbose",
                  help="Be verbose.")

(options, args) = parser.parse_args()

if len(args) == 0:
    source_path = "-"
elif len(args) == 1:
    source_path = args[0]
else:
    parser.print_usage()

from fastimport.processors import info_processor
from fastimport.errors import ParsingError
from fastimport.helpers import get_source_stream
from fastimport import parser
stream = get_source_stream(source_path)
proc = info_processor.InfoProcessor(verbose=options.verbose)
p = parser.ImportParser(stream, verbose=options.verbose)
try:
    sys.exit(proc.process(p.iter_commands))
except ParsingError as e:
    sys.stderr.write("%d: Parse error: %s\n" % (e.lineno, e))
    sys.exit(1)