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""" 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): """ A refactoring tool that can avoid overwriting its input files. Prints output to stdout. Output files can optionally be written to a different directory and or have an extra file suffix appended to their name for use in situations where you do not want to replace the input files. """ def __init__(self, fixers, options, explicit, nobackups, show_diffs, input_base_dir='', output_dir='', append_suffix=''): """ Args: fixers: A list of fixers to import. options: A dict with RefactoringTool configuration. explicit: A list of fixers to run even if they are explicit. nobackups: If true no backup '.bak' files will be created for those files that are being refactored. show_diffs: Should diffs of the refactoring be printed to stdout? input_base_dir: The base directory for all input files. This class will strip this path prefix off of filenames before substituting it with output_dir. Only meaningful if output_dir is supplied. All files processed by refactor() must start with this path. output_dir: If supplied, all converted files will be written into this directory tree instead of input_base_dir. append_suffix: If supplied, all files output by this tool will have this appended to their filename. Useful for changing .py to .py3 for example by passing append_suffix='3'. """ self.nobackups = nobackups self.show_diffs = show_diffs if input_base_dir and not input_base_dir.endswith(os.sep): input_base_dir += os.sep self._input_base_dir = input_base_dir self._output_dir = output_dir self._append_suffix = append_suffix 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): orig_filename = filename if self._output_dir: if filename.startswith(self._input_base_dir): filename = os.path.join(self._output_dir, filename[len(self._input_base_dir):]) else: raise ValueError('filename %s does not start with the ' 'input_base_dir %s' % ( filename, self._input_base_dir)) if self._append_suffix: filename += self._append_suffix if orig_filename != filename: output_dir = os.path.dirname(filename) if not os.path.isdir(output_dir): os.makedirs(output_dir) self.log_message('Writing converted %s to %s.', orig_filename, filename) 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) if orig_filename != filename: # Preserve the file mode in the new output directory. shutil.copymode(orig_filename, 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") parser.add_option("-o", "--output-dir", action="store", type="str", default="", help="Put output files in this directory " "instead of overwriting the input files. Requires -n.") parser.add_option("-W", "--write-unchanged-files", action="store_true", help="Also write files even if no changes were required" " (useful with --output-dir); implies -w.") parser.add_option("--add-suffix", action="store", type="str", default="", help="Append this string to all output filenames." " Requires -n if non-empty. " "ex: --add-suffix='3' will generate .py3 files.") # Parse command line arguments refactor_stdin = False flags = {} options, args = parser.parse_args(args) if options.write_unchanged_files: flags["write_unchanged_files"] = True if not options.write: warn("--write-unchanged-files/-W implies -w.") options.write = True # If we allowed these, the original files would be renamed to backup names # but not replaced. if options.output_dir and not options.nobackups: parser.error("Can't use --output-dir/-o without -n.") if options.add_suffix and not options.nobackups: parser.error("Can't use --add-suffix without -n.") 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) logger = logging.getLogger('lib2to3.main') # 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) input_base_dir = os.path.commonprefix(args) if (input_base_dir and not input_base_dir.endswith(os.sep) and not os.path.isdir(input_base_dir)): # One or more similar names were passed, their directory is the base. # os.path.commonprefix() is ignorant of path elements, this corrects # for that weird API. input_base_dir = os.path.dirname(input_base_dir) if options.output_dir: input_base_dir = input_base_dir.rstrip(os.sep) logger.info('Output in %r will mirror the input directory %r layout.', options.output_dir, input_base_dir) rt = StdoutRefactoringTool( sorted(fixer_names), flags, sorted(explicit), options.nobackups, not options.no_diffs, input_base_dir=input_base_dir, output_dir=options.output_dir, append_suffix=options.add_suffix) # 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))