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annotate env/lib/python3.7/site-packages/libfuturize/main.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 """
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2 futurize: automatic conversion to clean 2/3 code using ``python-future``
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3 ======================================================================
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4
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5 Like Armin Ronacher's modernize.py, ``futurize`` attempts to produce clean
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6 standard Python 3 code that runs on both Py2 and Py3.
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7
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8 One pass
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9 --------
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10
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11 Use it like this on Python 2 code:
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12
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13 $ futurize --verbose mypython2script.py
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14
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15 This will attempt to port the code to standard Py3 code that also
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16 provides Py2 compatibility with the help of the right imports from
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17 ``future``.
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18
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19 To write changes to the files, use the -w flag.
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20
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21 Two stages
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22 ----------
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23
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24 The ``futurize`` script can also be called in two separate stages. First:
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25
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26 $ futurize --stage1 mypython2script.py
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27
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28 This produces more modern Python 2 code that is not yet compatible with Python
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29 3. The tests should still run and the diff should be uncontroversial to apply to
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30 most Python projects that are willing to drop support for Python 2.5 and lower.
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31
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32 After this, the recommended approach is to explicitly mark all strings that must
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33 be byte-strings with a b'' prefix and all text (unicode) strings with a u''
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34 prefix, and then invoke the second stage of Python 2 to 2/3 conversion with::
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35
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36 $ futurize --stage2 mypython2script.py
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37
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38 Stage 2 adds a dependency on ``future``. It converts most remaining Python
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39 2-specific code to Python 3 code and adds appropriate imports from ``future``
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40 to restore Py2 support.
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41
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42 The command above leaves all unadorned string literals as native strings
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43 (byte-strings on Py2, unicode strings on Py3). If instead you would like all
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44 unadorned string literals to be promoted to unicode, you can also pass this
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45 flag:
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46
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47 $ futurize --stage2 --unicode-literals mypython2script.py
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48
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49 This adds the declaration ``from __future__ import unicode_literals`` to the
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50 top of each file, which implicitly declares all unadorned string literals to be
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51 unicode strings (``unicode`` on Py2).
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52
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53 All imports
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54 -----------
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55
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56 The --all-imports option forces adding all ``__future__`` imports,
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57 ``builtins`` imports, and standard library aliases, even if they don't
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58 seem necessary for the current state of each module. (This can simplify
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59 testing, and can reduce the need to think about Py2 compatibility when editing
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60 the code further.)
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61
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62 """
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63
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64 from __future__ import (absolute_import, print_function, unicode_literals)
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65 import future.utils
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66 from future import __version__
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67
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68 import sys
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69 import logging
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70 import optparse
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71 import os
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72
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73 from lib2to3.main import warn, StdoutRefactoringTool
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74 from lib2to3 import refactor
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75
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76 from libfuturize.fixes import (lib2to3_fix_names_stage1,
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77 lib2to3_fix_names_stage2,
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78 libfuturize_fix_names_stage1,
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79 libfuturize_fix_names_stage2)
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80
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81 fixer_pkg = 'libfuturize.fixes'
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82
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83
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84 def main(args=None):
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85 """Main program.
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86
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87 Args:
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88 fixer_pkg: the name of a package where the fixers are located.
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89 args: optional; a list of command line arguments. If omitted,
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90 sys.argv[1:] is used.
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91
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92 Returns a suggested exit status (0, 1, 2).
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93 """
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94
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95 # Set up option parser
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96 parser = optparse.OptionParser(usage="futurize [options] file|dir ...")
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97 parser.add_option("-V", "--version", action="store_true",
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98 help="Report the version number of futurize")
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99 parser.add_option("-a", "--all-imports", action="store_true",
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100 help="Add all __future__ and future imports to each module")
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101 parser.add_option("-1", "--stage1", action="store_true",
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102 help="Modernize Python 2 code only; no compatibility with Python 3 (or dependency on ``future``)")
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103 parser.add_option("-2", "--stage2", action="store_true",
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104 help="Take modernized (stage1) code and add a dependency on ``future`` to provide Py3 compatibility.")
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105 parser.add_option("-0", "--both-stages", action="store_true",
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106 help="Apply both stages 1 and 2")
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107 parser.add_option("-u", "--unicode-literals", action="store_true",
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108 help="Add ``from __future__ import unicode_literals`` to implicitly convert all unadorned string literals '' into unicode strings")
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109 parser.add_option("-f", "--fix", action="append", default=[],
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110 help="Each FIX specifies a transformation; default: all.\nEither use '-f division -f metaclass' etc. or use the fully-qualified module name: '-f lib2to3.fixes.fix_types -f libfuturize.fixes.fix_unicode_keep_u'")
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111 parser.add_option("-j", "--processes", action="store", default=1,
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112 type="int", help="Run 2to3 concurrently")
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113 parser.add_option("-x", "--nofix", action="append", default=[],
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114 help="Prevent a fixer from being run.")
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115 parser.add_option("-l", "--list-fixes", action="store_true",
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116 help="List available transformations")
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117 parser.add_option("-p", "--print-function", action="store_true",
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118 help="Modify the grammar so that print() is a function")
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119 parser.add_option("-v", "--verbose", action="store_true",
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120 help="More verbose logging")
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121 parser.add_option("--no-diffs", action="store_true",
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122 help="Don't show diffs of the refactoring")
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123 parser.add_option("-w", "--write", action="store_true",
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124 help="Write back modified files")
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125 parser.add_option("-n", "--nobackups", action="store_true", default=False,
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126 help="Don't write backups for modified files.")
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127 parser.add_option("-o", "--output-dir", action="store", type="str",
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128 default="", help="Put output files in this directory "
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diff changeset
129 "instead of overwriting the input files. Requires -n. "
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130 "For Python >= 2.7 only.")
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131 parser.add_option("-W", "--write-unchanged-files", action="store_true",
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132 help="Also write files even if no changes were required"
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133 " (useful with --output-dir); implies -w.")
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134 parser.add_option("--add-suffix", action="store", type="str", default="",
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135 help="Append this string to all output filenames."
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136 " Requires -n if non-empty. For Python >= 2.7 only."
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137 "ex: --add-suffix='3' will generate .py3 files.")
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138
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139 # Parse command line arguments
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140 flags = {}
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141 refactor_stdin = False
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142 options, args = parser.parse_args(args)
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143
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144 if options.write_unchanged_files:
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145 flags["write_unchanged_files"] = True
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146 if not options.write:
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147 warn("--write-unchanged-files/-W implies -w.")
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148 options.write = True
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149 # If we allowed these, the original files would be renamed to backup names
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150 # but not replaced.
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151 if options.output_dir and not options.nobackups:
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152 parser.error("Can't use --output-dir/-o without -n.")
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153 if options.add_suffix and not options.nobackups:
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154 parser.error("Can't use --add-suffix without -n.")
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155
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156 if not options.write and options.no_diffs:
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157 warn("not writing files and not printing diffs; that's not very useful")
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parents:
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158 if not options.write and options.nobackups:
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159 parser.error("Can't use -n without -w")
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parents:
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160 if "-" in args:
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161 refactor_stdin = True
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162 if options.write:
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163 print("Can't write to stdin.", file=sys.stderr)
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164 return 2
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165 # Is this ever necessary?
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166 if options.print_function:
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167 flags["print_function"] = True
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168
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169 # Set up logging handler
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170 level = logging.DEBUG if options.verbose else logging.INFO
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171 logging.basicConfig(format='%(name)s: %(message)s', level=level)
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172 logger = logging.getLogger('libfuturize.main')
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173
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diff changeset
174 if options.stage1 or options.stage2:
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diff changeset
175 assert options.both_stages is None
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176 options.both_stages = False
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177 else:
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178 options.both_stages = True
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179
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180 avail_fixes = set()
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181
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diff changeset
182 if options.stage1 or options.both_stages:
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parents:
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183 avail_fixes.update(lib2to3_fix_names_stage1)
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184 avail_fixes.update(libfuturize_fix_names_stage1)
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parents:
diff changeset
185 if options.stage2 or options.both_stages:
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186 avail_fixes.update(lib2to3_fix_names_stage2)
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187 avail_fixes.update(libfuturize_fix_names_stage2)
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188
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parents:
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189 if options.unicode_literals:
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190 avail_fixes.add('libfuturize.fixes.fix_unicode_literals_import')
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parents:
diff changeset
191
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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192 if options.version:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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193 print(__version__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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194 return 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
195 if options.list_fixes:
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196 print("Available transformations for the -f/--fix option:")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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197 # for fixname in sorted(refactor.get_all_fix_names(fixer_pkg)):
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parents:
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198 for fixname in sorted(avail_fixes):
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parents:
diff changeset
199 print(fixname)
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parents:
diff changeset
200 if not args:
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diff changeset
201 return 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
202 if not args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
203 print("At least one file or directory argument required.",
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
204 file=sys.stderr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
205 print("Use --help to show usage.", file=sys.stderr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
206 return 2
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parents:
diff changeset
207
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diff changeset
208 unwanted_fixes = set()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
209 for fix in options.nofix:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
210 if ".fix_" in fix:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
211 unwanted_fixes.add(fix)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
212 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
213 # Infer the full module name for the fixer.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
214 # First ensure that no names clash (e.g.
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parents:
diff changeset
215 # lib2to3.fixes.fix_blah and libfuturize.fixes.fix_blah):
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parents:
diff changeset
216 found = [f for f in avail_fixes
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parents:
diff changeset
217 if f.endswith('fix_{0}'.format(fix))]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
218 if len(found) > 1:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
219 print("Ambiguous fixer name. Choose a fully qualified "
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
220 "module name instead from these:\n" +
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
221 "\n".join(" " + myf for myf in found),
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
222 file=sys.stderr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
223 return 2
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
224 elif len(found) == 0:
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parents:
diff changeset
225 print("Unknown fixer. Use --list-fixes or -l for a list.",
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
226 file=sys.stderr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
227 return 2
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
228 unwanted_fixes.add(found[0])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
229
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
230 extra_fixes = set()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
231 if options.all_imports:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
232 if options.stage1:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
233 prefix = 'libfuturize.fixes.'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
234 extra_fixes.add(prefix +
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
235 'fix_add__future__imports_except_unicode_literals')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
236 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
237 # In case the user hasn't run stage1 for some reason:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
238 prefix = 'libpasteurize.fixes.'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
239 extra_fixes.add(prefix + 'fix_add_all__future__imports')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
240 extra_fixes.add(prefix + 'fix_add_future_standard_library_import')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
241 extra_fixes.add(prefix + 'fix_add_all_future_builtins')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
242 explicit = set()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
243 if options.fix:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
244 all_present = False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
245 for fix in options.fix:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
246 if fix == 'all':
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
247 all_present = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
248 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
249 if ".fix_" in fix:
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250 explicit.add(fix)
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251 else:
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252 # Infer the full module name for the fixer.
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253 # First ensure that no names clash (e.g.
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254 # lib2to3.fixes.fix_blah and libfuturize.fixes.fix_blah):
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255 found = [f for f in avail_fixes
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256 if f.endswith('fix_{0}'.format(fix))]
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257 if len(found) > 1:
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258 print("Ambiguous fixer name. Choose a fully qualified "
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259 "module name instead from these:\n" +
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260 "\n".join(" " + myf for myf in found),
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261 file=sys.stderr)
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262 return 2
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263 elif len(found) == 0:
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264 print("Unknown fixer. Use --list-fixes or -l for a list.",
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265 file=sys.stderr)
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266 return 2
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267 explicit.add(found[0])
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268 if len(explicit & unwanted_fixes) > 0:
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269 print("Conflicting usage: the following fixers have been "
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270 "simultaneously requested and disallowed:\n" +
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271 "\n".join(" " + myf for myf in (explicit & unwanted_fixes)),
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272 file=sys.stderr)
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273 return 2
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274 requested = avail_fixes.union(explicit) if all_present else explicit
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275 else:
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276 requested = avail_fixes.union(explicit)
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277 fixer_names = (requested | extra_fixes) - unwanted_fixes
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278
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279 input_base_dir = os.path.commonprefix(args)
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280 if (input_base_dir and not input_base_dir.endswith(os.sep)
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281 and not os.path.isdir(input_base_dir)):
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282 # One or more similar names were passed, their directory is the base.
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283 # os.path.commonprefix() is ignorant of path elements, this corrects
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284 # for that weird API.
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285 input_base_dir = os.path.dirname(input_base_dir)
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286 if options.output_dir:
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287 input_base_dir = input_base_dir.rstrip(os.sep)
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288 logger.info('Output in %r will mirror the input directory %r layout.',
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289 options.output_dir, input_base_dir)
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290
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291 # Initialize the refactoring tool
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292 if future.utils.PY26:
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293 extra_kwargs = {}
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294 else:
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295 extra_kwargs = {
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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296 'append_suffix': options.add_suffix,
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297 'output_dir': options.output_dir,
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298 'input_base_dir': input_base_dir,
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299 }
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300
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301 rt = StdoutRefactoringTool(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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302 sorted(fixer_names), flags, sorted(explicit),
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303 options.nobackups, not options.no_diffs,
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304 **extra_kwargs)
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305
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306 # Refactor all files and directories passed as arguments
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307 if not rt.errors:
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308 if refactor_stdin:
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309 rt.refactor_stdin()
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310 else:
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311 try:
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312 rt.refactor(args, options.write, None,
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313 options.processes)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
314 except refactor.MultiprocessingUnsupported:
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315 assert options.processes > 1
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
316 print("Sorry, -j isn't " \
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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317 "supported on this platform.", file=sys.stderr)
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318 return 1
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diff changeset
319 rt.summarize()
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320
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321 # Return error status (0 if rt.errors is zero)
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322 return int(bool(rt.errors))