/lib-python/modified-2.7/lib2to3/main.py
Python | 182 lines | 173 code | 5 blank | 4 comment | 5 complexity | 6910943f9b2d1b1a4eb5e04f4c70a52a MD5 | raw file
- """
- Main program for 2to3.
- """
- from __future__ import with_statement
- import sys
- import os
- import difflib
- import logging
- import shutil
- import optparse
- from . import refactor
- def diff_texts(a, b, filename):
- """Return a unified diff of two strings."""
- a = a.splitlines()
- b = b.splitlines()
- return difflib.unified_diff(a, b, filename, filename,
- "(original)", "(refactored)",
- lineterm="")
- class StdoutRefactoringTool(refactor.MultiprocessRefactoringTool):
- """
- Prints output to stdout.
- """
- def __init__(self, fixers, options, explicit, nobackups, show_diffs):
- self.nobackups = nobackups
- self.show_diffs = show_diffs
- 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, encoding):
- 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
- write = super(StdoutRefactoringTool, self).write_file
- write(new_text, filename, old_text, encoding)
- if not self.nobackups:
- shutil.copymode(backup, filename)
- def print_output(self, old, new, filename, equal):
- if equal:
- self.log_message("No changes to %s", filename)
- else:
- self.log_message("Refactored %s", filename)
- if self.show_diffs:
- diff_lines = diff_texts(old, new, filename)
- try:
- if self.output_lock is not None:
- with self.output_lock:
- for line in diff_lines:
- print line
- sys.stdout.flush()
- else:
- for line in diff_lines:
- print line
- except UnicodeEncodeError:
- warn("couldn't encode %s's diff for your terminal" %
- (filename,))
- return
- def warn(msg):
- print >> sys.stderr, "WARNING: %s" % (msg,)
- 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("-j", "--processes", action="store", default=1,
- type="int", help="Run 2to3 concurrently")
- parser.add_option("-x", "--nofix", action="append", default=[],
- help="Prevent a transformation from being run")
- parser.add_option("-l", "--list-fixes", action="store_true",
- help="List available transformations")
- 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("--no-diffs", action="store_true",
- help="Don't show diffs of the refactoring")
- 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
- flags = {}
- options, args = parser.parse_args(args)
- if not options.write and options.no_diffs:
- warn("not writing files and not printing diffs; that's not very useful")
- 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
- if options.print_function:
- flags["print_function"] = True
- # 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
- 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), flags, sorted(explicit),
- options.nobackups, not options.no_diffs)
- # Refactor all files and directories passed as arguments
- if not rt.errors:
- if refactor_stdin:
- rt.refactor_stdin()
- else:
- try:
- rt.refactor(args, options.write, options.doctests_only,
- options.processes)
- except refactor.MultiprocessingUnsupported:
- assert options.processes > 1
- print >> sys.stderr, "Sorry, -j isn't " \
- "supported on this platform."
- return 1
- rt.summarize()
- # Return error status (0 if rt.errors is zero)
- return int(bool(rt.errors))