/Lib/lib2to3/main.py
http://unladen-swallow.googlecode.com/ · Python · 133 lines · 95 code · 15 blank · 23 comment · 29 complexity · 85da2f9b910a7b8af322a872949da4e1 MD5 · raw file
- """
- Main program for 2to3.
- """
- import sys
- import os
- import logging
- import shutil
- import optparse
- from . import refactor
- class StdoutRefactoringTool(refactor.RefactoringTool):
- """
- Prints output to stdout.
- """
- def __init__(self, fixers, options, explicit, nobackups):
- self.nobackups = nobackups
- super(StdoutRefactoringTool, self).__init__(fixers, options, explicit)
- def log_error(self, msg, *args, **kwargs):
- self.errors.append((msg, args, kwargs))
- self.logger.error(msg, *args, **kwargs)
- def write_file(self, new_text, filename, old_text):
- if not self.nobackups:
- # Make backup
- backup = filename + ".bak"
- if os.path.lexists(backup):
- try:
- os.remove(backup)
- except os.error, err:
- self.log_message("Can't remove backup %s", backup)
- try:
- os.rename(filename, backup)
- except os.error, err:
- self.log_message("Can't rename %s to %s", filename, backup)
- # Actually write the new file
- super(StdoutRefactoringTool, self).write_file(new_text,
- filename, old_text)
- if not self.nobackups:
- shutil.copymode(backup, filename)
- def print_output(self, lines):
- for line in lines:
- print line
- def main(fixer_pkg, args=None):
- """Main program.
- Args:
- fixer_pkg: the name of a package where the fixers are located.
- args: optional; a list of command line arguments. If omitted,
- sys.argv[1:] is used.
- Returns a suggested exit status (0, 1, 2).
- """
- # Set up option parser
- parser = optparse.OptionParser(usage="2to3 [options] file|dir ...")
- parser.add_option("-d", "--doctests_only", action="store_true",
- help="Fix up doctests only")
- parser.add_option("-f", "--fix", action="append", default=[],
- help="Each FIX specifies a transformation; default: all")
- parser.add_option("-x", "--nofix", action="append", default=[],
- help="Prevent a fixer from being run.")
- parser.add_option("-l", "--list-fixes", action="store_true",
- help="List available transformations (fixes/fix_*.py)")
- parser.add_option("-p", "--print-function", action="store_true",
- help="Modify the grammar so that print() is a function")
- parser.add_option("-v", "--verbose", action="store_true",
- help="More verbose logging")
- parser.add_option("-w", "--write", action="store_true",
- help="Write back modified files")
- parser.add_option("-n", "--nobackups", action="store_true", default=False,
- help="Don't write backups for modified files.")
- # Parse command line arguments
- refactor_stdin = False
- options, args = parser.parse_args(args)
- if not options.write and options.nobackups:
- parser.error("Can't use -n without -w")
- if options.list_fixes:
- print "Available transformations for the -f/--fix option:"
- for fixname in refactor.get_all_fix_names(fixer_pkg):
- print fixname
- if not args:
- return 0
- if not args:
- print >>sys.stderr, "At least one file or directory argument required."
- print >>sys.stderr, "Use --help to show usage."
- return 2
- if "-" in args:
- refactor_stdin = True
- if options.write:
- print >>sys.stderr, "Can't write to stdin."
- return 2
- # Set up logging handler
- level = logging.DEBUG if options.verbose else logging.INFO
- logging.basicConfig(format='%(name)s: %(message)s', level=level)
- # Initialize the refactoring tool
- rt_opts = {"print_function" : options.print_function}
- avail_fixes = set(refactor.get_fixers_from_package(fixer_pkg))
- unwanted_fixes = set(fixer_pkg + ".fix_" + fix for fix in options.nofix)
- explicit = set()
- if options.fix:
- all_present = False
- for fix in options.fix:
- if fix == "all":
- all_present = True
- else:
- explicit.add(fixer_pkg + ".fix_" + fix)
- requested = avail_fixes.union(explicit) if all_present else explicit
- else:
- requested = avail_fixes.union(explicit)
- fixer_names = requested.difference(unwanted_fixes)
- rt = StdoutRefactoringTool(sorted(fixer_names), rt_opts, sorted(explicit),
- options.nobackups)
- # Refactor all files and directories passed as arguments
- if not rt.errors:
- if refactor_stdin:
- rt.refactor_stdin()
- else:
- rt.refactor(args, options.write, options.doctests_only)
- rt.summarize()
- # Return error status (0 if rt.errors is zero)
- return int(bool(rt.errors))