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python37
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python3.7
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libpasteurize
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main.py
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""" pasteurize: automatic conversion of Python 3 code to clean 2/3 code =================================================================== ``pasteurize`` attempts to convert existing Python 3 code into source-compatible Python 2 and 3 code. Use it like this on Python 3 code: $ pasteurize --verbose mypython3script.py This removes any Py3-only syntax (e.g. new metaclasses) and adds these import lines: from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals from future import standard_library standard_library.install_hooks() from builtins import * To write changes to the files, use the -w flag. It also adds any other wrappers needed for Py2/3 compatibility. Note that separate stages are not available (or needed) when converting from Python 3 with ``pasteurize`` as they are when converting from Python 2 with ``futurize``. The --all-imports option forces adding all ``__future__`` imports, ``builtins`` imports, and standard library aliases, even if they don't seem necessary for the current state of each module. (This can simplify testing, and can reduce the need to think about Py2 compatibility when editing the code further.) """ from __future__ import (absolute_import, print_function, unicode_literals) import sys import logging import optparse from lib2to3.main import main, warn, StdoutRefactoringTool from lib2to3 import refactor from future import __version__ from libpasteurize.fixes import fix_names def main(args=None): """Main program. Returns a suggested exit status (0, 1, 2). """ # Set up option parser parser = optparse.OptionParser(usage="pasteurize [options] file|dir ...") parser.add_option("-V", "--version", action="store_true", help="Report the version number of pasteurize") parser.add_option("-a", "--all-imports", action="store_true", help="Adds all __future__ and future imports to each module") 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") # 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) fixer_pkg = 'libpasteurize.fixes' avail_fixes = fix_names flags["print_function"] = True 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.version: print(__version__) return 0 if options.list_fixes: print("Available transformations for the -f/--fix option:") for fixname in sorted(avail_fixes): print(fixname) if not args: return 0 if not args: print("At least one file or directory argument required.", file=sys.stderr) print("Use --help to show usage.", file=sys.stderr) return 2 if "-" in args: refactor_stdin = True if options.write: print("Can't write to stdin.", file=sys.stderr) return 2 # Set up logging handler level = logging.DEBUG if options.verbose else logging.INFO logging.basicConfig(format='%(name)s: %(message)s', level=level) unwanted_fixes = set() for fix in options.nofix: if ".fix_" in fix: unwanted_fixes.add(fix) else: # Infer the full module name for the fixer. # First ensure that no names clash (e.g. # lib2to3.fixes.fix_blah and libfuturize.fixes.fix_blah): found = [f for f in avail_fixes if f.endswith('fix_{0}'.format(fix))] if len(found) > 1: print("Ambiguous fixer name. Choose a fully qualified " "module name instead from these:\n" + "\n".join(" " + myf for myf in found), file=sys.stderr) return 2 elif len(found) == 0: print("Unknown fixer. Use --list-fixes or -l for a list.", file=sys.stderr) return 2 unwanted_fixes.add(found[0]) extra_fixes = set() if options.all_imports: prefix = 'libpasteurize.fixes.' extra_fixes.add(prefix + 'fix_add_all__future__imports') extra_fixes.add(prefix + 'fix_add_future_standard_library_import') extra_fixes.add(prefix + 'fix_add_all_future_builtins') explicit = set() if options.fix: all_present = False for fix in options.fix: if fix == 'all': all_present = True else: if ".fix_" in fix: explicit.add(fix) else: # Infer the full module name for the fixer. # First ensure that no names clash (e.g. # lib2to3.fixes.fix_blah and libpasteurize.fixes.fix_blah): found = [f for f in avail_fixes if f.endswith('fix_{0}'.format(fix))] if len(found) > 1: print("Ambiguous fixer name. Choose a fully qualified " "module name instead from these:\n" + "\n".join(" " + myf for myf in found), file=sys.stderr) return 2 elif len(found) == 0: print("Unknown fixer. Use --list-fixes or -l for a list.", file=sys.stderr) return 2 explicit.add(found[0]) if len(explicit & unwanted_fixes) > 0: print("Conflicting usage: the following fixers have been " "simultaneously requested and disallowed:\n" + "\n".join(" " + myf for myf in (explicit & unwanted_fixes)), file=sys.stderr) return 2 requested = avail_fixes.union(explicit) if all_present else explicit else: requested = avail_fixes.union(explicit) fixer_names = requested | extra_fixes - unwanted_fixes # Initialize the refactoring tool rt = StdoutRefactoringTool(sorted(fixer_names), flags, set(), 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, None, options.processes) except refactor.MultiprocessingUnsupported: assert options.processes > 1 print("Sorry, -j isn't " \ "supported on this platform.", file=sys.stderr) return 1 rt.summarize() # Return error status (0 if rt.errors is zero) return int(bool(rt.errors))