copy lib2to3 from the trunk
diff --git a/Lib/lib2to3/main.py b/Lib/lib2to3/main.py
new file mode 100644
index 0000000..caf54dd
--- /dev/null
+++ b/Lib/lib2to3/main.py
@@ -0,0 +1,174 @@
+"""
+Main program for 2to3.
+"""
+
+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:
+ 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 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("--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))