127 lines
3.6 KiB
Python
127 lines
3.6 KiB
Python
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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Generic entry point script."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import errno as _errno
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import sys as _sys
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from tensorflow.python.platform import flags
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from tensorflow.python.util.tf_export import tf_export
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def _usage(shorthelp):
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"""Writes __main__'s docstring to stdout with some help text.
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Args:
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shorthelp: bool, if True, prints only flags from the main module,
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rather than all flags.
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"""
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doc = _sys.modules['__main__'].__doc__
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if not doc:
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doc = '\nUSAGE: %s [flags]\n' % _sys.argv[0]
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doc = flags.text_wrap(doc, indent=' ', firstline_indent='')
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else:
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# Replace all '%s' with sys.argv[0], and all '%%' with '%'.
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num_specifiers = doc.count('%') - 2 * doc.count('%%')
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try:
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doc %= (_sys.argv[0],) * num_specifiers
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except (OverflowError, TypeError, ValueError):
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# Just display the docstring as-is.
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pass
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if shorthelp:
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flag_str = flags.FLAGS.main_module_help()
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else:
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flag_str = str(flags.FLAGS)
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try:
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_sys.stdout.write(doc)
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if flag_str:
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_sys.stdout.write('\nflags:\n')
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_sys.stdout.write(flag_str)
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_sys.stdout.write('\n')
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except IOError as e:
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# We avoid printing a huge backtrace if we get EPIPE, because
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# "foo.par --help | less" is a frequent use case.
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if e.errno != _errno.EPIPE:
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raise
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class _HelpFlag(flags.BooleanFlag):
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"""Special boolean flag that displays usage and raises SystemExit."""
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NAME = 'help'
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SHORT_NAME = 'h'
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def __init__(self):
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super(_HelpFlag, self).__init__(
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self.NAME, False, 'show this help', short_name=self.SHORT_NAME)
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def parse(self, arg):
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if arg:
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_usage(shorthelp=True)
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print()
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print('Try --helpfull to get a list of all flags.')
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_sys.exit(1)
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class _HelpshortFlag(_HelpFlag):
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"""--helpshort is an alias for --help."""
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NAME = 'helpshort'
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SHORT_NAME = None
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class _HelpfullFlag(flags.BooleanFlag):
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"""Display help for flags in main module and all dependent modules."""
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def __init__(self):
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super(_HelpfullFlag, self).__init__('helpfull', False, 'show full help')
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def parse(self, arg):
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if arg:
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_usage(shorthelp=False)
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_sys.exit(1)
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_define_help_flags_called = False
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def _define_help_flags():
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global _define_help_flags_called
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if not _define_help_flags_called:
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flags.DEFINE_flag(_HelpFlag())
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flags.DEFINE_flag(_HelpfullFlag())
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flags.DEFINE_flag(_HelpshortFlag())
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_define_help_flags_called = True
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@tf_export('app.run')
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def run(main=None, argv=None):
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"""Runs the program with an optional 'main' function and 'argv' list."""
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# Define help flags.
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_define_help_flags()
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# Parse known flags.
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argv = flags.FLAGS(_sys.argv if argv is None else argv, known_only=True)
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main = main or _sys.modules['__main__'].main
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# Call the main function, passing through any arguments
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# to the final program.
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_sys.exit(main(argv))
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