This file is indexed.

/usr/bin/gflags2man is in python-gflags 1.5.1-1build1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
#!/usr/bin/env python
#
# Copyright (c) 2007, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""gflags2man runs a Google flags base program and generates a man page.

Run the program, parse the output, and then format that into a man
page.

Usage:
  gflags2man <program> [program] ...
"""

# TODO(csilvers): work with windows paths (\) as well as unix (/)

# This may seem a bit of an end run, but it:  doesn't bloat flags, can
# support python/java/C++, supports older executables, and can be
# extended to other document formats.
# Inspired by help2man.

__author__ = 'Dan Christian'

import os
import re
import sys
import stat
import time

import gflags

_VERSION = '0.1'


def _GetDefaultDestDir():
  home = os.environ.get('HOME', '')
  homeman = os.path.join(home, 'man', 'man1')
  if home and os.path.exists(homeman):
    return homeman
  else:
    return os.environ.get('TMPDIR', '/tmp')

FLAGS = gflags.FLAGS
gflags.DEFINE_string('dest_dir', _GetDefaultDestDir(),
                     'Directory to write resulting manpage to.'
                     ' Specify \'-\' for stdout')
gflags.DEFINE_string('help_flag', '--help',
                     'Option to pass to target program in to get help')
gflags.DEFINE_integer('v', 0, 'verbosity level to use for output')

_MIN_VALID_USAGE_MSG = 9         # if fewer lines than this, help is suspect


class Logging:
  """A super-simple logging class"""
  def error(self, msg): print >>sys.stderr, "ERROR: ", msg
  def warn(self, msg): print >>sys.stderr, "WARNING: ", msg
  def info(self, msg): print msg
  def debug(self, msg): self.vlog(1, msg)
  def vlog(self, level, msg):
    if FLAGS.v >= level: print msg
logging = Logging()


def GetRealPath(filename):
  """Given an executable filename, find in the PATH or find absolute path.
  Args:
    filename  An executable filename (string)
  Returns:
    Absolute version of filename.
    None if filename could not be found locally, absolutely, or in PATH
  """
  if os.path.isabs(filename):                # already absolute
    return filename

  if filename.startswith('./') or  filename.startswith('../'): # relative
    return os.path.abspath(filename)

  path = os.getenv('PATH', '')
  for directory in path.split(':'):
    tryname = os.path.join(directory, filename)
    if os.path.exists(tryname):
      if not os.path.isabs(directory):  # relative directory
        return os.path.abspath(tryname)
      return tryname
  if os.path.exists(filename):
    return os.path.abspath(filename)
  return None                         # could not determine

class Flag(object):
  """The information about a single flag."""

  def __init__(self, flag_desc, help):
    """Create the flag object.
    Args:
      flag_desc  The command line forms this could take. (string)
      help       The help text (string)
    """
    self.desc = flag_desc               # the command line forms
    self.help = help                    # the help text
    self.default = ''                   # default value
    self.tips = ''                      # parsing/syntax tips


class ProgramInfo(object):
  """All the information gleaned from running a program with --help."""

  # Match a module block start, for python scripts --help
  # "goopy.logging:"
  module_py_re = re.compile(r'(\S.+):$')
  # match the start of a flag listing
  # " -v,--verbosity:  Logging verbosity"
  flag_py_re         = re.compile(r'\s+(-\S+):\s+(.*)$')
  # "   (default: '0')"
  flag_default_py_re = re.compile(r'\s+\(default:\s+\'(.*)\'\)$')
  # "   (an integer)"
  flag_tips_py_re    = re.compile(r'\s+\((.*)\)$')

  # Match a module block start, for c++ programs --help
  # "google/base/commandlineflags"
  module_c_re = re.compile(r'\s+Flags from (\S.+):$')
  # match the start of a flag listing
  # " -v,--verbosity:  Logging verbosity"
  flag_c_re         = re.compile(r'\s+(-\S+)\s+(.*)$')

  # Match a module block start, for java programs --help
  # "com.google.common.flags"
  module_java_re = re.compile(r'\s+Flags for (\S.+):$')
  # match the start of a flag listing
  # " -v,--verbosity:  Logging verbosity"
  flag_java_re         = re.compile(r'\s+(-\S+)\s+(.*)$')

  def __init__(self, executable):
    """Create object with executable.
    Args:
      executable  Program to execute (string)
    """
    self.long_name = executable
    self.name = os.path.basename(executable)  # name
    # Get name without extension (PAR files)
    (self.short_name, self.ext) = os.path.splitext(self.name)
    self.executable = GetRealPath(executable)  # name of the program
    self.output = []          # output from the program.  List of lines.
    self.desc = []            # top level description.  List of lines
    self.modules = {}         # { section_name(string), [ flags ] }
    self.module_list = []     # list of module names in their original order
    self.date = time.localtime(time.time())   # default date info

  def Run(self):
    """Run it and collect output.

    Returns:
      1 (true)   If everything went well.
      0 (false)  If there were problems.
    """
    if not self.executable:
      logging.error('Could not locate "%s"' % self.long_name)
      return 0

    finfo = os.stat(self.executable)
    self.date = time.localtime(finfo[stat.ST_MTIME])

    logging.info('Running: %s %s </dev/null 2>&1'
                 % (self.executable, FLAGS.help_flag))
    # --help output is often routed to stderr, so we combine with stdout.
    # Re-direct stdin to /dev/null to encourage programs that
    # don't understand --help to exit.
    (child_stdin, child_stdout_and_stderr) = os.popen4(
      [self.executable, FLAGS.help_flag])
    child_stdin.close()       # '</dev/null'
    self.output = child_stdout_and_stderr.readlines()
    child_stdout_and_stderr.close()
    if len(self.output) < _MIN_VALID_USAGE_MSG:
      logging.error('Error: "%s %s" returned only %d lines: %s'
                    % (self.name, FLAGS.help_flag,
                       len(self.output), self.output))
      return 0
    return 1

  def Parse(self):
    """Parse program output."""
    (start_line, lang) = self.ParseDesc()
    if start_line < 0:
      return
    if 'python' == lang:
      self.ParsePythonFlags(start_line)
    elif 'c' == lang:
      self.ParseCFlags(start_line)
    elif 'java' == lang:
      self.ParseJavaFlags(start_line)

  def ParseDesc(self, start_line=0):
    """Parse the initial description.

    This could be Python or C++.

    Returns:
      (start_line, lang_type)
        start_line  Line to start parsing flags on (int)
        lang_type   Either 'python' or 'c'
       (-1, '')  if the flags start could not be found
    """
    exec_mod_start = self.executable + ':'

    after_blank = 0
    start_line = 0             # ignore the passed-in arg for now (?)
    for start_line in range(start_line, len(self.output)): # collect top description
      line = self.output[start_line].rstrip()
      # Python flags start with 'flags:\n'
      if ('flags:' == line
          and len(self.output) > start_line+1
          and '' == self.output[start_line+1].rstrip()):
        start_line += 2
        logging.debug('Flags start (python): %s' % line)
        return (start_line, 'python')
      # SWIG flags just have the module name followed by colon.
      if exec_mod_start == line:
        logging.debug('Flags start (swig): %s' % line)
        return (start_line, 'python')
      # C++ flags begin after a blank line and with a constant string
      if after_blank and line.startswith('  Flags from '):
        logging.debug('Flags start (c): %s' % line)
        return (start_line, 'c')
      # java flags begin with a constant string
      if line == 'where flags are':
        logging.debug('Flags start (java): %s' % line)
        start_line += 2                        # skip "Standard flags:"
        return (start_line, 'java')

      logging.debug('Desc: %s' % line)
      self.desc.append(line)
      after_blank = (line == '')
    else:
      logging.warn('Never found the start of the flags section for "%s"!'
                   % self.long_name)
      return (-1, '')

  def ParsePythonFlags(self, start_line=0):
    """Parse python/swig style flags."""
    modname = None                      # name of current module
    modlist = []
    flag = None
    for line_num in range(start_line, len(self.output)): # collect flags
      line = self.output[line_num].rstrip()
      if not line:                      # blank
        continue

      mobj = self.module_py_re.match(line)
      if mobj:                          # start of a new module
        modname = mobj.group(1)
        logging.debug('Module: %s' % line)
        if flag:
          modlist.append(flag)
        self.module_list.append(modname)
        self.modules.setdefault(modname, [])
        modlist = self.modules[modname]
        flag = None
        continue

      mobj = self.flag_py_re.match(line)
      if mobj:                          # start of a new flag
        if flag:
          modlist.append(flag)
        logging.debug('Flag: %s' % line)
        flag = Flag(mobj.group(1),  mobj.group(2))
        continue

      if not flag:                    # continuation of a flag
        logging.error('Flag info, but no current flag "%s"' % line)
      mobj = self.flag_default_py_re.match(line)
      if mobj:                          # (default: '...')
        flag.default = mobj.group(1)
        logging.debug('Fdef: %s' % line)
        continue
      mobj = self.flag_tips_py_re.match(line)
      if mobj:                          # (tips)
        flag.tips = mobj.group(1)
        logging.debug('Ftip: %s' % line)
        continue
      if flag and flag.help:
        flag.help += line              # multiflags tack on an extra line
      else:
        logging.info('Extra: %s' % line)
    if flag:
      modlist.append(flag)

  def ParseCFlags(self, start_line=0):
    """Parse C style flags."""
    modname = None                      # name of current module
    modlist = []
    flag = None
    for line_num in range(start_line, len(self.output)):  # collect flags
      line = self.output[line_num].rstrip()
      if not line:                      # blank lines terminate flags
        if flag:                        # save last flag
          modlist.append(flag)
          flag = None
        continue

      mobj = self.module_c_re.match(line)
      if mobj:                          # start of a new module
        modname = mobj.group(1)
        logging.debug('Module: %s' % line)
        if flag:
          modlist.append(flag)
        self.module_list.append(modname)
        self.modules.setdefault(modname, [])
        modlist = self.modules[modname]
        flag = None
        continue

      mobj = self.flag_c_re.match(line)
      if mobj:                          # start of a new flag
        if flag:                        # save last flag
          modlist.append(flag)
        logging.debug('Flag: %s' % line)
        flag = Flag(mobj.group(1),  mobj.group(2))
        continue

      # append to flag help.  type and default are part of the main text
      if flag:
        flag.help += ' ' + line.strip()
      else:
        logging.info('Extra: %s' % line)
    if flag:
      modlist.append(flag)

  def ParseJavaFlags(self, start_line=0):
    """Parse Java style flags (com.google.common.flags)."""
    # The java flags prints starts with a "Standard flags" "module"
    # that doesn't follow the standard module syntax.
    modname = 'Standard flags'          # name of current module
    self.module_list.append(modname)
    self.modules.setdefault(modname, [])
    modlist = self.modules[modname]
    flag = None

    for line_num in range(start_line, len(self.output)): # collect flags
      line = self.output[line_num].rstrip()
      logging.vlog(2, 'Line: "%s"' % line)
      if not line:                      # blank lines terminate module
        if flag:                        # save last flag
          modlist.append(flag)
          flag = None
        continue

      mobj = self.module_java_re.match(line)
      if mobj:                          # start of a new module
        modname = mobj.group(1)
        logging.debug('Module: %s' % line)
        if flag:
          modlist.append(flag)
        self.module_list.append(modname)
        self.modules.setdefault(modname, [])
        modlist = self.modules[modname]
        flag = None
        continue

      mobj = self.flag_java_re.match(line)
      if mobj:                          # start of a new flag
        if flag:                        # save last flag
          modlist.append(flag)
        logging.debug('Flag: %s' % line)
        flag = Flag(mobj.group(1),  mobj.group(2))
        continue

      # append to flag help.  type and default are part of the main text
      if flag:
        flag.help += ' ' + line.strip()
      else:
        logging.info('Extra: %s' % line)
    if flag:
      modlist.append(flag)

  def Filter(self):
    """Filter parsed data to create derived fields."""
    if not self.desc:
      self.short_desc = ''
      return

    for i in range(len(self.desc)):   # replace full path with name
      if self.desc[i].find(self.executable) >= 0:
        self.desc[i] = self.desc[i].replace(self.executable, self.name)

    self.short_desc = self.desc[0]
    word_list = self.short_desc.split(' ')
    all_names = [ self.name, self.short_name, ]
    # Since the short_desc is always listed right after the name,
    #  trim it from the short_desc
    while word_list and (word_list[0] in all_names
                         or word_list[0].lower() in all_names):
      del word_list[0]
      self.short_desc = ''              # signal need to reconstruct
    if not self.short_desc and word_list:
      self.short_desc = ' '.join(word_list)


class GenerateDoc(object):
  """Base class to output flags information."""

  def __init__(self, proginfo, directory='.'):
    """Create base object.
    Args:
      proginfo   A ProgramInfo object
      directory  Directory to write output into
    """
    self.info = proginfo
    self.dirname = directory

  def Output(self):
    """Output all sections of the page."""
    self.Open()
    self.Header()
    self.Body()
    self.Footer()

  def Open(self): raise NotImplementedError    # define in subclass
  def Header(self): raise NotImplementedError  # define in subclass
  def Body(self): raise NotImplementedError    # define in subclass
  def Footer(self): raise NotImplementedError  # define in subclass


class GenerateMan(GenerateDoc):
  """Output a man page."""

  def __init__(self, proginfo, directory='.'):
    """Create base object.
    Args:
      proginfo   A ProgramInfo object
      directory  Directory to write output into
    """
    GenerateDoc.__init__(self, proginfo, directory)

  def Open(self):
    if self.dirname == '-':
      logging.info('Writing to stdout')
      self.fp = sys.stdout
    else:
      self.file_path = '%s.1' % os.path.join(self.dirname, self.info.name)
      logging.info('Writing: %s' % self.file_path)
      self.fp = open(self.file_path, 'w')

  def Header(self):
    self.fp.write(
      '.\\" DO NOT MODIFY THIS FILE!  It was generated by gflags2man %s\n'
      % _VERSION)
    self.fp.write(
      '.TH %s "1" "%s" "%s" "User Commands"\n'
      % (self.info.name, time.strftime('%x', self.info.date), self.info.name))
    self.fp.write(
      '.SH NAME\n%s \\- %s\n' % (self.info.name, self.info.short_desc))
    self.fp.write(
      '.SH SYNOPSIS\n.B %s\n[\\fIFLAGS\\fR]...\n' % self.info.name)

  def Body(self):
    self.fp.write(
      '.SH DESCRIPTION\n.\\" Add any additional description here\n.PP\n')
    for ln in self.info.desc:
      self.fp.write('%s\n' % ln)
    self.fp.write(
      '.SH OPTIONS\n')
    # This shows flags in the original order
    for modname in self.info.module_list:
      if modname.find(self.info.executable) >= 0:
        mod = modname.replace(self.info.executable, self.info.name)
      else:
        mod = modname
      self.fp.write('\n.P\n.I %s\n' % mod)
      for flag in self.info.modules[modname]:
        help_string = flag.help
        if flag.default or flag.tips:
          help_string += '\n.br\n'
        if flag.default:
          help_string += '  (default: \'%s\')' % flag.default
        if flag.tips:
          help_string += '  (%s)' % flag.tips
        self.fp.write(
          '.TP\n%s\n%s\n' % (flag.desc, help_string))

  def Footer(self):
    self.fp.write(
      '.SH COPYRIGHT\nCopyright \(co %s Google.\n'
      % time.strftime('%Y', self.info.date))
    self.fp.write('Gflags2man created this page from "%s %s" output.\n'
                  % (self.info.name, FLAGS.help_flag))
    self.fp.write('\nGflags2man was written by Dan Christian. '
                  ' Note that the date on this'
                  ' page is the modification date of %s.\n' % self.info.name)


def main(argv):
  argv = FLAGS(argv)           # handles help as well
  if len(argv) <= 1:
    print >>sys.stderr, __doc__
    print >>sys.stderr, "flags:"
    print >>sys.stderr, str(FLAGS)
    return 1

  for arg in argv[1:]:
    prog = ProgramInfo(arg)
    if not prog.Run():
      continue
    prog.Parse()
    prog.Filter()
    doc = GenerateMan(prog, FLAGS.dest_dir)
    doc.Output()
  return 0

if __name__ == '__main__':
  main(sys.argv)