source: python/trunk/Lib/optparse.py

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[2]1"""A powerful, extensible, and easy-to-use option parser.
2
3By Greg Ward <gward@python.net>
4
5Originally distributed as Optik.
6
7For support, use the optik-users@lists.sourceforge.net mailing list
8(http://lists.sourceforge.net/lists/listinfo/optik-users).
9
10Simple usage example:
11
12 from optparse import OptionParser
13
14 parser = OptionParser()
15 parser.add_option("-f", "--file", dest="filename",
16 help="write report to FILE", metavar="FILE")
17 parser.add_option("-q", "--quiet",
18 action="store_false", dest="verbose", default=True,
19 help="don't print status messages to stdout")
20
21 (options, args) = parser.parse_args()
22"""
23
24__version__ = "1.5.3"
25
26__all__ = ['Option',
27 'make_option',
28 'SUPPRESS_HELP',
29 'SUPPRESS_USAGE',
30 'Values',
31 'OptionContainer',
32 'OptionGroup',
33 'OptionParser',
34 'HelpFormatter',
35 'IndentedHelpFormatter',
36 'TitledHelpFormatter',
37 'OptParseError',
38 'OptionError',
39 'OptionConflictError',
40 'OptionValueError',
41 'BadOptionError']
42
43__copyright__ = """
44Copyright (c) 2001-2006 Gregory P. Ward. All rights reserved.
45Copyright (c) 2002-2006 Python Software Foundation. All rights reserved.
46
47Redistribution and use in source and binary forms, with or without
48modification, are permitted provided that the following conditions are
49met:
50
51 * Redistributions of source code must retain the above copyright
52 notice, this list of conditions and the following disclaimer.
53
54 * Redistributions in binary form must reproduce the above copyright
55 notice, this list of conditions and the following disclaimer in the
56 documentation and/or other materials provided with the distribution.
57
58 * Neither the name of the author nor the names of its
59 contributors may be used to endorse or promote products derived from
60 this software without specific prior written permission.
61
62THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
63IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
64TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
65PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
66CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
67EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
68PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
69PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
70LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
71NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
72SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
73"""
74
75import sys, os
76import types
77import textwrap
78
79def _repr(self):
80 return "<%s at 0x%x: %s>" % (self.__class__.__name__, id(self), self)
81
82
83# This file was generated from:
84# Id: option_parser.py 527 2006-07-23 15:21:30Z greg
85# Id: option.py 522 2006-06-11 16:22:03Z gward
86# Id: help.py 527 2006-07-23 15:21:30Z greg
87# Id: errors.py 509 2006-04-20 00:58:24Z gward
88
89try:
90 from gettext import gettext
91except ImportError:
92 def gettext(message):
93 return message
94_ = gettext
95
96
97class OptParseError (Exception):
98 def __init__(self, msg):
99 self.msg = msg
100
101 def __str__(self):
102 return self.msg
103
104
105class OptionError (OptParseError):
106 """
107 Raised if an Option instance is created with invalid or
108 inconsistent arguments.
109 """
110
111 def __init__(self, msg, option):
112 self.msg = msg
113 self.option_id = str(option)
114
115 def __str__(self):
116 if self.option_id:
117 return "option %s: %s" % (self.option_id, self.msg)
118 else:
119 return self.msg
120
121class OptionConflictError (OptionError):
122 """
123 Raised if conflicting options are added to an OptionParser.
124 """
125
126class OptionValueError (OptParseError):
127 """
128 Raised if an invalid option value is encountered on the command
129 line.
130 """
131
132class BadOptionError (OptParseError):
133 """
134 Raised if an invalid option is seen on the command line.
135 """
136 def __init__(self, opt_str):
137 self.opt_str = opt_str
138
139 def __str__(self):
140 return _("no such option: %s") % self.opt_str
141
142class AmbiguousOptionError (BadOptionError):
143 """
144 Raised if an ambiguous option is seen on the command line.
145 """
146 def __init__(self, opt_str, possibilities):
147 BadOptionError.__init__(self, opt_str)
148 self.possibilities = possibilities
149
150 def __str__(self):
151 return (_("ambiguous option: %s (%s?)")
152 % (self.opt_str, ", ".join(self.possibilities)))
153
154
155class HelpFormatter:
156
157 """
158 Abstract base class for formatting option help. OptionParser
159 instances should use one of the HelpFormatter subclasses for
160 formatting help; by default IndentedHelpFormatter is used.
161
162 Instance attributes:
163 parser : OptionParser
164 the controlling OptionParser instance
165 indent_increment : int
166 the number of columns to indent per nesting level
167 max_help_position : int
168 the maximum starting column for option help text
169 help_position : int
170 the calculated starting column for option help text;
171 initially the same as the maximum
172 width : int
173 total number of columns for output (pass None to constructor for
174 this value to be taken from the $COLUMNS environment variable)
175 level : int
176 current indentation level
177 current_indent : int
178 current indentation level (in columns)
179 help_width : int
180 number of columns available for option help text (calculated)
181 default_tag : str
182 text to replace with each option's default value, "%default"
183 by default. Set to false value to disable default value expansion.
184 option_strings : { Option : str }
185 maps Option instances to the snippet of help text explaining
186 the syntax of that option, e.g. "-h, --help" or
187 "-fFILE, --file=FILE"
188 _short_opt_fmt : str
189 format string controlling how short options with values are
190 printed in help text. Must be either "%s%s" ("-fFILE") or
191 "%s %s" ("-f FILE"), because those are the two syntaxes that
192 Optik supports.
193 _long_opt_fmt : str
194 similar but for long options; must be either "%s %s" ("--file FILE")
195 or "%s=%s" ("--file=FILE").
196 """
197
198 NO_DEFAULT_VALUE = "none"
199
200 def __init__(self,
201 indent_increment,
202 max_help_position,
203 width,
204 short_first):
205 self.parser = None
206 self.indent_increment = indent_increment
207 self.help_position = self.max_help_position = max_help_position
208 if width is None:
209 try:
210 width = int(os.environ['COLUMNS'])
211 except (KeyError, ValueError):
212 width = 80
213 width -= 2
214 self.width = width
215 self.current_indent = 0
216 self.level = 0
217 self.help_width = None # computed later
218 self.short_first = short_first
219 self.default_tag = "%default"
220 self.option_strings = {}
221 self._short_opt_fmt = "%s %s"
222 self._long_opt_fmt = "%s=%s"
223
224 def set_parser(self, parser):
225 self.parser = parser
226
227 def set_short_opt_delimiter(self, delim):
228 if delim not in ("", " "):
229 raise ValueError(
230 "invalid metavar delimiter for short options: %r" % delim)
231 self._short_opt_fmt = "%s" + delim + "%s"
232
233 def set_long_opt_delimiter(self, delim):
234 if delim not in ("=", " "):
235 raise ValueError(
236 "invalid metavar delimiter for long options: %r" % delim)
237 self._long_opt_fmt = "%s" + delim + "%s"
238
239 def indent(self):
240 self.current_indent += self.indent_increment
241 self.level += 1
242
243 def dedent(self):
244 self.current_indent -= self.indent_increment
245 assert self.current_indent >= 0, "Indent decreased below 0."
246 self.level -= 1
247
248 def format_usage(self, usage):
249 raise NotImplementedError, "subclasses must implement"
250
251 def format_heading(self, heading):
252 raise NotImplementedError, "subclasses must implement"
253
254 def _format_text(self, text):
255 """
256 Format a paragraph of free-form text for inclusion in the
257 help output at the current indentation level.
258 """
259 text_width = self.width - self.current_indent
260 indent = " "*self.current_indent
261 return textwrap.fill(text,
262 text_width,
263 initial_indent=indent,
264 subsequent_indent=indent)
265
266 def format_description(self, description):
267 if description:
268 return self._format_text(description) + "\n"
269 else:
270 return ""
271
272 def format_epilog(self, epilog):
273 if epilog:
274 return "\n" + self._format_text(epilog) + "\n"
275 else:
276 return ""
277
278
279 def expand_default(self, option):
280 if self.parser is None or not self.default_tag:
281 return option.help
282
283 default_value = self.parser.defaults.get(option.dest)
284 if default_value is NO_DEFAULT or default_value is None:
285 default_value = self.NO_DEFAULT_VALUE
286
287 return option.help.replace(self.default_tag, str(default_value))
288
289 def format_option(self, option):
290 # The help for each option consists of two parts:
291 # * the opt strings and metavars
292 # eg. ("-x", or "-fFILENAME, --file=FILENAME")
293 # * the user-supplied help string
294 # eg. ("turn on expert mode", "read data from FILENAME")
295 #
296 # If possible, we write both of these on the same line:
297 # -x turn on expert mode
298 #
299 # But if the opt string list is too long, we put the help
300 # string on a second line, indented to the same column it would
301 # start in if it fit on the first line.
302 # -fFILENAME, --file=FILENAME
303 # read data from FILENAME
304 result = []
305 opts = self.option_strings[option]
306 opt_width = self.help_position - self.current_indent - 2
307 if len(opts) > opt_width:
308 opts = "%*s%s\n" % (self.current_indent, "", opts)
309 indent_first = self.help_position
310 else: # start help on same line as opts
311 opts = "%*s%-*s " % (self.current_indent, "", opt_width, opts)
312 indent_first = 0
313 result.append(opts)
314 if option.help:
315 help_text = self.expand_default(option)
316 help_lines = textwrap.wrap(help_text, self.help_width)
317 result.append("%*s%s\n" % (indent_first, "", help_lines[0]))
318 result.extend(["%*s%s\n" % (self.help_position, "", line)
319 for line in help_lines[1:]])
320 elif opts[-1] != "\n":
321 result.append("\n")
322 return "".join(result)
323
324 def store_option_strings(self, parser):
325 self.indent()
326 max_len = 0
327 for opt in parser.option_list:
328 strings = self.format_option_strings(opt)
329 self.option_strings[opt] = strings
330 max_len = max(max_len, len(strings) + self.current_indent)
331 self.indent()
332 for group in parser.option_groups:
333 for opt in group.option_list:
334 strings = self.format_option_strings(opt)
335 self.option_strings[opt] = strings
336 max_len = max(max_len, len(strings) + self.current_indent)
337 self.dedent()
338 self.dedent()
339 self.help_position = min(max_len + 2, self.max_help_position)
340 self.help_width = self.width - self.help_position
341
342 def format_option_strings(self, option):
343 """Return a comma-separated list of option strings & metavariables."""
344 if option.takes_value():
345 metavar = option.metavar or option.dest.upper()
346 short_opts = [self._short_opt_fmt % (sopt, metavar)
347 for sopt in option._short_opts]
348 long_opts = [self._long_opt_fmt % (lopt, metavar)
349 for lopt in option._long_opts]
350 else:
351 short_opts = option._short_opts
352 long_opts = option._long_opts
353
354 if self.short_first:
355 opts = short_opts + long_opts
356 else:
357 opts = long_opts + short_opts
358
359 return ", ".join(opts)
360
361class IndentedHelpFormatter (HelpFormatter):
362 """Format help with indented section bodies.
363 """
364
365 def __init__(self,
366 indent_increment=2,
367 max_help_position=24,
368 width=None,
369 short_first=1):
370 HelpFormatter.__init__(
371 self, indent_increment, max_help_position, width, short_first)
372
373 def format_usage(self, usage):
374 return _("Usage: %s\n") % usage
375
376 def format_heading(self, heading):
377 return "%*s%s:\n" % (self.current_indent, "", heading)
378
379
380class TitledHelpFormatter (HelpFormatter):
381 """Format help with underlined section headers.
382 """
383
384 def __init__(self,
385 indent_increment=0,
386 max_help_position=24,
387 width=None,
388 short_first=0):
389 HelpFormatter.__init__ (
390 self, indent_increment, max_help_position, width, short_first)
391
392 def format_usage(self, usage):
393 return "%s %s\n" % (self.format_heading(_("Usage")), usage)
394
395 def format_heading(self, heading):
396 return "%s\n%s\n" % (heading, "=-"[self.level] * len(heading))
397
398
399def _parse_num(val, type):
400 if val[:2].lower() == "0x": # hexadecimal
401 radix = 16
402 elif val[:2].lower() == "0b": # binary
403 radix = 2
404 val = val[2:] or "0" # have to remove "0b" prefix
405 elif val[:1] == "0": # octal
406 radix = 8
407 else: # decimal
408 radix = 10
409
410 return type(val, radix)
411
412def _parse_int(val):
413 return _parse_num(val, int)
414
415def _parse_long(val):
416 return _parse_num(val, long)
417
418_builtin_cvt = { "int" : (_parse_int, _("integer")),
419 "long" : (_parse_long, _("long integer")),
420 "float" : (float, _("floating-point")),
421 "complex" : (complex, _("complex")) }
422
423def check_builtin(option, opt, value):
424 (cvt, what) = _builtin_cvt[option.type]
425 try:
426 return cvt(value)
427 except ValueError:
428 raise OptionValueError(
429 _("option %s: invalid %s value: %r") % (opt, what, value))
430
431def check_choice(option, opt, value):
432 if value in option.choices:
433 return value
434 else:
435 choices = ", ".join(map(repr, option.choices))
436 raise OptionValueError(
437 _("option %s: invalid choice: %r (choose from %s)")
438 % (opt, value, choices))
439
440# Not supplying a default is different from a default of None,
441# so we need an explicit "not supplied" value.
442NO_DEFAULT = ("NO", "DEFAULT")
443
444
445class Option:
446 """
447 Instance attributes:
448 _short_opts : [string]
449 _long_opts : [string]
450
451 action : string
452 type : string
453 dest : string
454 default : any
455 nargs : int
456 const : any
457 choices : [string]
458 callback : function
459 callback_args : (any*)
460 callback_kwargs : { string : any }
461 help : string
462 metavar : string
463 """
464
465 # The list of instance attributes that may be set through
466 # keyword args to the constructor.
467 ATTRS = ['action',
468 'type',
469 'dest',
470 'default',
471 'nargs',
472 'const',
473 'choices',
474 'callback',
475 'callback_args',
476 'callback_kwargs',
477 'help',
478 'metavar']
479
480 # The set of actions allowed by option parsers. Explicitly listed
481 # here so the constructor can validate its arguments.
482 ACTIONS = ("store",
483 "store_const",
484 "store_true",
485 "store_false",
486 "append",
487 "append_const",
488 "count",
489 "callback",
490 "help",
491 "version")
492
493 # The set of actions that involve storing a value somewhere;
494 # also listed just for constructor argument validation. (If
495 # the action is one of these, there must be a destination.)
496 STORE_ACTIONS = ("store",
497 "store_const",
498 "store_true",
499 "store_false",
500 "append",
501 "append_const",
502 "count")
503
504 # The set of actions for which it makes sense to supply a value
505 # type, ie. which may consume an argument from the command line.
506 TYPED_ACTIONS = ("store",
507 "append",
508 "callback")
509
510 # The set of actions which *require* a value type, ie. that
511 # always consume an argument from the command line.
512 ALWAYS_TYPED_ACTIONS = ("store",
513 "append")
514
515 # The set of actions which take a 'const' attribute.
516 CONST_ACTIONS = ("store_const",
517 "append_const")
518
519 # The set of known types for option parsers. Again, listed here for
520 # constructor argument validation.
521 TYPES = ("string", "int", "long", "float", "complex", "choice")
522
523 # Dictionary of argument checking functions, which convert and
524 # validate option arguments according to the option type.
525 #
526 # Signature of checking functions is:
527 # check(option : Option, opt : string, value : string) -> any
528 # where
529 # option is the Option instance calling the checker
530 # opt is the actual option seen on the command-line
531 # (eg. "-a", "--file")
532 # value is the option argument seen on the command-line
533 #
534 # The return value should be in the appropriate Python type
535 # for option.type -- eg. an integer if option.type == "int".
536 #
537 # If no checker is defined for a type, arguments will be
538 # unchecked and remain strings.
539 TYPE_CHECKER = { "int" : check_builtin,
540 "long" : check_builtin,
541 "float" : check_builtin,
542 "complex": check_builtin,
543 "choice" : check_choice,
544 }
545
546
547 # CHECK_METHODS is a list of unbound method objects; they are called
548 # by the constructor, in order, after all attributes are
549 # initialized. The list is created and filled in later, after all
550 # the methods are actually defined. (I just put it here because I
551 # like to define and document all class attributes in the same
552 # place.) Subclasses that add another _check_*() method should
553 # define their own CHECK_METHODS list that adds their check method
554 # to those from this class.
555 CHECK_METHODS = None
556
557
558 # -- Constructor/initialization methods ----------------------------
559
560 def __init__(self, *opts, **attrs):
561 # Set _short_opts, _long_opts attrs from 'opts' tuple.
562 # Have to be set now, in case no option strings are supplied.
563 self._short_opts = []
564 self._long_opts = []
565 opts = self._check_opt_strings(opts)
566 self._set_opt_strings(opts)
567
568 # Set all other attrs (action, type, etc.) from 'attrs' dict
569 self._set_attrs(attrs)
570
571 # Check all the attributes we just set. There are lots of
572 # complicated interdependencies, but luckily they can be farmed
573 # out to the _check_*() methods listed in CHECK_METHODS -- which
574 # could be handy for subclasses! The one thing these all share
575 # is that they raise OptionError if they discover a problem.
576 for checker in self.CHECK_METHODS:
577 checker(self)
578
579 def _check_opt_strings(self, opts):
580 # Filter out None because early versions of Optik had exactly
581 # one short option and one long option, either of which
582 # could be None.
583 opts = filter(None, opts)
584 if not opts:
585 raise TypeError("at least one option string must be supplied")
586 return opts
587
588 def _set_opt_strings(self, opts):
589 for opt in opts:
590 if len(opt) < 2:
591 raise OptionError(
592 "invalid option string %r: "
593 "must be at least two characters long" % opt, self)
594 elif len(opt) == 2:
595 if not (opt[0] == "-" and opt[1] != "-"):
596 raise OptionError(
597 "invalid short option string %r: "
598 "must be of the form -x, (x any non-dash char)" % opt,
599 self)
600 self._short_opts.append(opt)
601 else:
602 if not (opt[0:2] == "--" and opt[2] != "-"):
603 raise OptionError(
604 "invalid long option string %r: "
605 "must start with --, followed by non-dash" % opt,
606 self)
607 self._long_opts.append(opt)
608
609 def _set_attrs(self, attrs):
610 for attr in self.ATTRS:
611 if attr in attrs:
612 setattr(self, attr, attrs[attr])
613 del attrs[attr]
614 else:
615 if attr == 'default':
616 setattr(self, attr, NO_DEFAULT)
617 else:
618 setattr(self, attr, None)
619 if attrs:
620 attrs = attrs.keys()
621 attrs.sort()
622 raise OptionError(
623 "invalid keyword arguments: %s" % ", ".join(attrs),
624 self)
625
626
627 # -- Constructor validation methods --------------------------------
628
629 def _check_action(self):
630 if self.action is None:
631 self.action = "store"
632 elif self.action not in self.ACTIONS:
633 raise OptionError("invalid action: %r" % self.action, self)
634
635 def _check_type(self):
636 if self.type is None:
637 if self.action in self.ALWAYS_TYPED_ACTIONS:
638 if self.choices is not None:
639 # The "choices" attribute implies "choice" type.
640 self.type = "choice"
641 else:
642 # No type given? "string" is the most sensible default.
643 self.type = "string"
644 else:
645 # Allow type objects or builtin type conversion functions
646 # (int, str, etc.) as an alternative to their names. (The
647 # complicated check of __builtin__ is only necessary for
648 # Python 2.1 and earlier, and is short-circuited by the
649 # first check on modern Pythons.)
650 import __builtin__
651 if ( type(self.type) is types.TypeType or
652 (hasattr(self.type, "__name__") and
653 getattr(__builtin__, self.type.__name__, None) is self.type) ):
654 self.type = self.type.__name__
655
656 if self.type == "str":
657 self.type = "string"
658
659 if self.type not in self.TYPES:
660 raise OptionError("invalid option type: %r" % self.type, self)
661 if self.action not in self.TYPED_ACTIONS:
662 raise OptionError(
663 "must not supply a type for action %r" % self.action, self)
664
665 def _check_choice(self):
666 if self.type == "choice":
667 if self.choices is None:
668 raise OptionError(
669 "must supply a list of choices for type 'choice'", self)
670 elif type(self.choices) not in (types.TupleType, types.ListType):
671 raise OptionError(
672 "choices must be a list of strings ('%s' supplied)"
673 % str(type(self.choices)).split("'")[1], self)
674 elif self.choices is not None:
675 raise OptionError(
676 "must not supply choices for type %r" % self.type, self)
677
678 def _check_dest(self):
679 # No destination given, and we need one for this action. The
680 # self.type check is for callbacks that take a value.
681 takes_value = (self.action in self.STORE_ACTIONS or
682 self.type is not None)
683 if self.dest is None and takes_value:
684
685 # Glean a destination from the first long option string,
686 # or from the first short option string if no long options.
687 if self._long_opts:
688 # eg. "--foo-bar" -> "foo_bar"
689 self.dest = self._long_opts[0][2:].replace('-', '_')
690 else:
691 self.dest = self._short_opts[0][1]
692
693 def _check_const(self):
694 if self.action not in self.CONST_ACTIONS and self.const is not None:
695 raise OptionError(
696 "'const' must not be supplied for action %r" % self.action,
697 self)
698
699 def _check_nargs(self):
700 if self.action in self.TYPED_ACTIONS:
701 if self.nargs is None:
702 self.nargs = 1
703 elif self.nargs is not None:
704 raise OptionError(
705 "'nargs' must not be supplied for action %r" % self.action,
706 self)
707
708 def _check_callback(self):
709 if self.action == "callback":
710 if not hasattr(self.callback, '__call__'):
711 raise OptionError(
712 "callback not callable: %r" % self.callback, self)
713 if (self.callback_args is not None and
714 type(self.callback_args) is not types.TupleType):
715 raise OptionError(
716 "callback_args, if supplied, must be a tuple: not %r"
717 % self.callback_args, self)
718 if (self.callback_kwargs is not None and
719 type(self.callback_kwargs) is not types.DictType):
720 raise OptionError(
721 "callback_kwargs, if supplied, must be a dict: not %r"
722 % self.callback_kwargs, self)
723 else:
724 if self.callback is not None:
725 raise OptionError(
726 "callback supplied (%r) for non-callback option"
727 % self.callback, self)
728 if self.callback_args is not None:
729 raise OptionError(
730 "callback_args supplied for non-callback option", self)
731 if self.callback_kwargs is not None:
732 raise OptionError(
733 "callback_kwargs supplied for non-callback option", self)
734
735
736 CHECK_METHODS = [_check_action,
737 _check_type,
738 _check_choice,
739 _check_dest,
740 _check_const,
741 _check_nargs,
742 _check_callback]
743
744
745 # -- Miscellaneous methods -----------------------------------------
746
747 def __str__(self):
748 return "/".join(self._short_opts + self._long_opts)
749
750 __repr__ = _repr
751
752 def takes_value(self):
753 return self.type is not None
754
755 def get_opt_string(self):
756 if self._long_opts:
757 return self._long_opts[0]
758 else:
759 return self._short_opts[0]
760
761
762 # -- Processing methods --------------------------------------------
763
764 def check_value(self, opt, value):
765 checker = self.TYPE_CHECKER.get(self.type)
766 if checker is None:
767 return value
768 else:
769 return checker(self, opt, value)
770
771 def convert_value(self, opt, value):
772 if value is not None:
773 if self.nargs == 1:
774 return self.check_value(opt, value)
775 else:
776 return tuple([self.check_value(opt, v) for v in value])
777
778 def process(self, opt, value, values, parser):
779
780 # First, convert the value(s) to the right type. Howl if any
781 # value(s) are bogus.
782 value = self.convert_value(opt, value)
783
784 # And then take whatever action is expected of us.
785 # This is a separate method to make life easier for
786 # subclasses to add new actions.
787 return self.take_action(
788 self.action, self.dest, opt, value, values, parser)
789
790 def take_action(self, action, dest, opt, value, values, parser):
791 if action == "store":
792 setattr(values, dest, value)
793 elif action == "store_const":
794 setattr(values, dest, self.const)
795 elif action == "store_true":
796 setattr(values, dest, True)
797 elif action == "store_false":
798 setattr(values, dest, False)
799 elif action == "append":
800 values.ensure_value(dest, []).append(value)
801 elif action == "append_const":
802 values.ensure_value(dest, []).append(self.const)
803 elif action == "count":
804 setattr(values, dest, values.ensure_value(dest, 0) + 1)
805 elif action == "callback":
806 args = self.callback_args or ()
807 kwargs = self.callback_kwargs or {}
808 self.callback(self, opt, value, parser, *args, **kwargs)
809 elif action == "help":
810 parser.print_help()
811 parser.exit()
812 elif action == "version":
813 parser.print_version()
814 parser.exit()
815 else:
[391]816 raise ValueError("unknown action %r" % self.action)
[2]817
818 return 1
819
820# class Option
821
822
823SUPPRESS_HELP = "SUPPRESS"+"HELP"
824SUPPRESS_USAGE = "SUPPRESS"+"USAGE"
825
826try:
827 basestring
828except NameError:
829 def isbasestring(x):
830 return isinstance(x, (types.StringType, types.UnicodeType))
831else:
832 def isbasestring(x):
833 return isinstance(x, basestring)
834
835class Values:
836
837 def __init__(self, defaults=None):
838 if defaults:
839 for (attr, val) in defaults.items():
840 setattr(self, attr, val)
841
842 def __str__(self):
843 return str(self.__dict__)
844
845 __repr__ = _repr
846
847 def __cmp__(self, other):
848 if isinstance(other, Values):
849 return cmp(self.__dict__, other.__dict__)
850 elif isinstance(other, types.DictType):
851 return cmp(self.__dict__, other)
852 else:
853 return -1
854
855 def _update_careful(self, dict):
856 """
857 Update the option values from an arbitrary dictionary, but only
858 use keys from dict that already have a corresponding attribute
859 in self. Any keys in dict without a corresponding attribute
860 are silently ignored.
861 """
862 for attr in dir(self):
863 if attr in dict:
864 dval = dict[attr]
865 if dval is not None:
866 setattr(self, attr, dval)
867
868 def _update_loose(self, dict):
869 """
870 Update the option values from an arbitrary dictionary,
871 using all keys from the dictionary regardless of whether
872 they have a corresponding attribute in self or not.
873 """
874 self.__dict__.update(dict)
875
876 def _update(self, dict, mode):
877 if mode == "careful":
878 self._update_careful(dict)
879 elif mode == "loose":
880 self._update_loose(dict)
881 else:
882 raise ValueError, "invalid update mode: %r" % mode
883
884 def read_module(self, modname, mode="careful"):
885 __import__(modname)
886 mod = sys.modules[modname]
887 self._update(vars(mod), mode)
888
889 def read_file(self, filename, mode="careful"):
890 vars = {}
891 execfile(filename, vars)
892 self._update(vars, mode)
893
894 def ensure_value(self, attr, value):
895 if not hasattr(self, attr) or getattr(self, attr) is None:
896 setattr(self, attr, value)
897 return getattr(self, attr)
898
899
900class OptionContainer:
901
902 """
903 Abstract base class.
904
905 Class attributes:
906 standard_option_list : [Option]
907 list of standard options that will be accepted by all instances
908 of this parser class (intended to be overridden by subclasses).
909
910 Instance attributes:
911 option_list : [Option]
912 the list of Option objects contained by this OptionContainer
913 _short_opt : { string : Option }
914 dictionary mapping short option strings, eg. "-f" or "-X",
915 to the Option instances that implement them. If an Option
916 has multiple short option strings, it will appears in this
917 dictionary multiple times. [1]
918 _long_opt : { string : Option }
919 dictionary mapping long option strings, eg. "--file" or
920 "--exclude", to the Option instances that implement them.
921 Again, a given Option can occur multiple times in this
922 dictionary. [1]
923 defaults : { string : any }
924 dictionary mapping option destination names to default
925 values for each destination [1]
926
927 [1] These mappings are common to (shared by) all components of the
928 controlling OptionParser, where they are initially created.
929
930 """
931
932 def __init__(self, option_class, conflict_handler, description):
933 # Initialize the option list and related data structures.
934 # This method must be provided by subclasses, and it must
935 # initialize at least the following instance attributes:
936 # option_list, _short_opt, _long_opt, defaults.
937 self._create_option_list()
938
939 self.option_class = option_class
940 self.set_conflict_handler(conflict_handler)
941 self.set_description(description)
942
943 def _create_option_mappings(self):
944 # For use by OptionParser constructor -- create the master
945 # option mappings used by this OptionParser and all
946 # OptionGroups that it owns.
947 self._short_opt = {} # single letter -> Option instance
948 self._long_opt = {} # long option -> Option instance
949 self.defaults = {} # maps option dest -> default value
950
951
952 def _share_option_mappings(self, parser):
953 # For use by OptionGroup constructor -- use shared option
954 # mappings from the OptionParser that owns this OptionGroup.
955 self._short_opt = parser._short_opt
956 self._long_opt = parser._long_opt
957 self.defaults = parser.defaults
958
959 def set_conflict_handler(self, handler):
960 if handler not in ("error", "resolve"):
961 raise ValueError, "invalid conflict_resolution value %r" % handler
962 self.conflict_handler = handler
963
964 def set_description(self, description):
965 self.description = description
966
967 def get_description(self):
968 return self.description
969
970
971 def destroy(self):
972 """see OptionParser.destroy()."""
973 del self._short_opt
974 del self._long_opt
975 del self.defaults
976
977
978 # -- Option-adding methods -----------------------------------------
979
980 def _check_conflict(self, option):
981 conflict_opts = []
982 for opt in option._short_opts:
983 if opt in self._short_opt:
984 conflict_opts.append((opt, self._short_opt[opt]))
985 for opt in option._long_opts:
986 if opt in self._long_opt:
987 conflict_opts.append((opt, self._long_opt[opt]))
988
989 if conflict_opts:
990 handler = self.conflict_handler
991 if handler == "error":
992 raise OptionConflictError(
993 "conflicting option string(s): %s"
994 % ", ".join([co[0] for co in conflict_opts]),
995 option)
996 elif handler == "resolve":
997 for (opt, c_option) in conflict_opts:
998 if opt.startswith("--"):
999 c_option._long_opts.remove(opt)
1000 del self._long_opt[opt]
1001 else:
1002 c_option._short_opts.remove(opt)
1003 del self._short_opt[opt]
1004 if not (c_option._short_opts or c_option._long_opts):
1005 c_option.container.option_list.remove(c_option)
1006
1007 def add_option(self, *args, **kwargs):
1008 """add_option(Option)
1009 add_option(opt_str, ..., kwarg=val, ...)
1010 """
1011 if type(args[0]) in types.StringTypes:
1012 option = self.option_class(*args, **kwargs)
1013 elif len(args) == 1 and not kwargs:
1014 option = args[0]
1015 if not isinstance(option, Option):
1016 raise TypeError, "not an Option instance: %r" % option
1017 else:
1018 raise TypeError, "invalid arguments"
1019
1020 self._check_conflict(option)
1021
1022 self.option_list.append(option)
1023 option.container = self
1024 for opt in option._short_opts:
1025 self._short_opt[opt] = option
1026 for opt in option._long_opts:
1027 self._long_opt[opt] = option
1028
1029 if option.dest is not None: # option has a dest, we need a default
1030 if option.default is not NO_DEFAULT:
1031 self.defaults[option.dest] = option.default
1032 elif option.dest not in self.defaults:
1033 self.defaults[option.dest] = None
1034
1035 return option
1036
1037 def add_options(self, option_list):
1038 for option in option_list:
1039 self.add_option(option)
1040
1041 # -- Option query/removal methods ----------------------------------
1042
1043 def get_option(self, opt_str):
1044 return (self._short_opt.get(opt_str) or
1045 self._long_opt.get(opt_str))
1046
1047 def has_option(self, opt_str):
1048 return (opt_str in self._short_opt or
1049 opt_str in self._long_opt)
1050
1051 def remove_option(self, opt_str):
1052 option = self._short_opt.get(opt_str)
1053 if option is None:
1054 option = self._long_opt.get(opt_str)
1055 if option is None:
1056 raise ValueError("no such option %r" % opt_str)
1057
1058 for opt in option._short_opts:
1059 del self._short_opt[opt]
1060 for opt in option._long_opts:
1061 del self._long_opt[opt]
1062 option.container.option_list.remove(option)
1063
1064
1065 # -- Help-formatting methods ---------------------------------------
1066
1067 def format_option_help(self, formatter):
1068 if not self.option_list:
1069 return ""
1070 result = []
1071 for option in self.option_list:
1072 if not option.help is SUPPRESS_HELP:
1073 result.append(formatter.format_option(option))
1074 return "".join(result)
1075
1076 def format_description(self, formatter):
1077 return formatter.format_description(self.get_description())
1078
1079 def format_help(self, formatter):
1080 result = []
1081 if self.description:
1082 result.append(self.format_description(formatter))
1083 if self.option_list:
1084 result.append(self.format_option_help(formatter))
1085 return "\n".join(result)
1086
1087
1088class OptionGroup (OptionContainer):
1089
1090 def __init__(self, parser, title, description=None):
1091 self.parser = parser
1092 OptionContainer.__init__(
1093 self, parser.option_class, parser.conflict_handler, description)
1094 self.title = title
1095
1096 def _create_option_list(self):
1097 self.option_list = []
1098 self._share_option_mappings(self.parser)
1099
1100 def set_title(self, title):
1101 self.title = title
1102
1103 def destroy(self):
1104 """see OptionParser.destroy()."""
1105 OptionContainer.destroy(self)
1106 del self.option_list
1107
1108 # -- Help-formatting methods ---------------------------------------
1109
1110 def format_help(self, formatter):
1111 result = formatter.format_heading(self.title)
1112 formatter.indent()
1113 result += OptionContainer.format_help(self, formatter)
1114 formatter.dedent()
1115 return result
1116
1117
1118class OptionParser (OptionContainer):
1119
1120 """
1121 Class attributes:
1122 standard_option_list : [Option]
1123 list of standard options that will be accepted by all instances
1124 of this parser class (intended to be overridden by subclasses).
1125
1126 Instance attributes:
1127 usage : string
1128 a usage string for your program. Before it is displayed
1129 to the user, "%prog" will be expanded to the name of
1130 your program (self.prog or os.path.basename(sys.argv[0])).
1131 prog : string
1132 the name of the current program (to override
1133 os.path.basename(sys.argv[0])).
[391]1134 description : string
1135 A paragraph of text giving a brief overview of your program.
1136 optparse reformats this paragraph to fit the current terminal
1137 width and prints it when the user requests help (after usage,
1138 but before the list of options).
[2]1139 epilog : string
1140 paragraph of help text to print after option help
1141
1142 option_groups : [OptionGroup]
1143 list of option groups in this parser (option groups are
1144 irrelevant for parsing the command-line, but very useful
1145 for generating help)
1146
1147 allow_interspersed_args : bool = true
1148 if true, positional arguments may be interspersed with options.
1149 Assuming -a and -b each take a single argument, the command-line
1150 -ablah foo bar -bboo baz
1151 will be interpreted the same as
1152 -ablah -bboo -- foo bar baz
1153 If this flag were false, that command line would be interpreted as
1154 -ablah -- foo bar -bboo baz
1155 -- ie. we stop processing options as soon as we see the first
1156 non-option argument. (This is the tradition followed by
1157 Python's getopt module, Perl's Getopt::Std, and other argument-
1158 parsing libraries, but it is generally annoying to users.)
1159
1160 process_default_values : bool = true
1161 if true, option default values are processed similarly to option
1162 values from the command line: that is, they are passed to the
1163 type-checking function for the option's type (as long as the
1164 default value is a string). (This really only matters if you
1165 have defined custom types; see SF bug #955889.) Set it to false
1166 to restore the behaviour of Optik 1.4.1 and earlier.
1167
1168 rargs : [string]
1169 the argument list currently being parsed. Only set when
1170 parse_args() is active, and continually trimmed down as
1171 we consume arguments. Mainly there for the benefit of
1172 callback options.
1173 largs : [string]
1174 the list of leftover arguments that we have skipped while
1175 parsing options. If allow_interspersed_args is false, this
1176 list is always empty.
1177 values : Values
1178 the set of option values currently being accumulated. Only
1179 set when parse_args() is active. Also mainly for callbacks.
1180
1181 Because of the 'rargs', 'largs', and 'values' attributes,
1182 OptionParser is not thread-safe. If, for some perverse reason, you
1183 need to parse command-line arguments simultaneously in different
1184 threads, use different OptionParser instances.
1185
1186 """
1187
1188 standard_option_list = []
1189
1190 def __init__(self,
1191 usage=None,
1192 option_list=None,
1193 option_class=Option,
1194 version=None,
1195 conflict_handler="error",
1196 description=None,
1197 formatter=None,
1198 add_help_option=True,
1199 prog=None,
1200 epilog=None):
1201 OptionContainer.__init__(
1202 self, option_class, conflict_handler, description)
1203 self.set_usage(usage)
1204 self.prog = prog
1205 self.version = version
1206 self.allow_interspersed_args = True
1207 self.process_default_values = True
1208 if formatter is None:
1209 formatter = IndentedHelpFormatter()
1210 self.formatter = formatter
1211 self.formatter.set_parser(self)
1212 self.epilog = epilog
1213
1214 # Populate the option list; initial sources are the
1215 # standard_option_list class attribute, the 'option_list'
1216 # argument, and (if applicable) the _add_version_option() and
1217 # _add_help_option() methods.
1218 self._populate_option_list(option_list,
1219 add_help=add_help_option)
1220
1221 self._init_parsing_state()
1222
1223
1224 def destroy(self):
1225 """
1226 Declare that you are done with this OptionParser. This cleans up
1227 reference cycles so the OptionParser (and all objects referenced by
1228 it) can be garbage-collected promptly. After calling destroy(), the
1229 OptionParser is unusable.
1230 """
1231 OptionContainer.destroy(self)
1232 for group in self.option_groups:
1233 group.destroy()
1234 del self.option_list
1235 del self.option_groups
1236 del self.formatter
1237
1238
1239 # -- Private methods -----------------------------------------------
1240 # (used by our or OptionContainer's constructor)
1241
1242 def _create_option_list(self):
1243 self.option_list = []
1244 self.option_groups = []
1245 self._create_option_mappings()
1246
1247 def _add_help_option(self):
1248 self.add_option("-h", "--help",
1249 action="help",
1250 help=_("show this help message and exit"))
1251
1252 def _add_version_option(self):
1253 self.add_option("--version",
1254 action="version",
1255 help=_("show program's version number and exit"))
1256
1257 def _populate_option_list(self, option_list, add_help=True):
1258 if self.standard_option_list:
1259 self.add_options(self.standard_option_list)
1260 if option_list:
1261 self.add_options(option_list)
1262 if self.version:
1263 self._add_version_option()
1264 if add_help:
1265 self._add_help_option()
1266
1267 def _init_parsing_state(self):
1268 # These are set in parse_args() for the convenience of callbacks.
1269 self.rargs = None
1270 self.largs = None
1271 self.values = None
1272
1273
1274 # -- Simple modifier methods ---------------------------------------
1275
1276 def set_usage(self, usage):
1277 if usage is None:
1278 self.usage = _("%prog [options]")
1279 elif usage is SUPPRESS_USAGE:
1280 self.usage = None
1281 # For backwards compatibility with Optik 1.3 and earlier.
1282 elif usage.lower().startswith("usage: "):
1283 self.usage = usage[7:]
1284 else:
1285 self.usage = usage
1286
1287 def enable_interspersed_args(self):
1288 """Set parsing to not stop on the first non-option, allowing
1289 interspersing switches with command arguments. This is the
1290 default behavior. See also disable_interspersed_args() and the
1291 class documentation description of the attribute
1292 allow_interspersed_args."""
1293 self.allow_interspersed_args = True
1294
1295 def disable_interspersed_args(self):
1296 """Set parsing to stop on the first non-option. Use this if
1297 you have a command processor which runs another command that
1298 has options of its own and you want to make sure these options
1299 don't get confused.
1300 """
1301 self.allow_interspersed_args = False
1302
1303 def set_process_default_values(self, process):
1304 self.process_default_values = process
1305
1306 def set_default(self, dest, value):
1307 self.defaults[dest] = value
1308
1309 def set_defaults(self, **kwargs):
1310 self.defaults.update(kwargs)
1311
1312 def _get_all_options(self):
1313 options = self.option_list[:]
1314 for group in self.option_groups:
1315 options.extend(group.option_list)
1316 return options
1317
1318 def get_default_values(self):
1319 if not self.process_default_values:
1320 # Old, pre-Optik 1.5 behaviour.
1321 return Values(self.defaults)
1322
1323 defaults = self.defaults.copy()
1324 for option in self._get_all_options():
1325 default = defaults.get(option.dest)
1326 if isbasestring(default):
1327 opt_str = option.get_opt_string()
1328 defaults[option.dest] = option.check_value(opt_str, default)
1329
1330 return Values(defaults)
1331
1332
1333 # -- OptionGroup methods -------------------------------------------
1334
1335 def add_option_group(self, *args, **kwargs):
1336 # XXX lots of overlap with OptionContainer.add_option()
1337 if type(args[0]) is types.StringType:
1338 group = OptionGroup(self, *args, **kwargs)
1339 elif len(args) == 1 and not kwargs:
1340 group = args[0]
1341 if not isinstance(group, OptionGroup):
1342 raise TypeError, "not an OptionGroup instance: %r" % group
1343 if group.parser is not self:
1344 raise ValueError, "invalid OptionGroup (wrong parser)"
1345 else:
1346 raise TypeError, "invalid arguments"
1347
1348 self.option_groups.append(group)
1349 return group
1350
1351 def get_option_group(self, opt_str):
1352 option = (self._short_opt.get(opt_str) or
1353 self._long_opt.get(opt_str))
1354 if option and option.container is not self:
1355 return option.container
1356 return None
1357
1358
1359 # -- Option-parsing methods ----------------------------------------
1360
1361 def _get_args(self, args):
1362 if args is None:
1363 return sys.argv[1:]
1364 else:
1365 return args[:] # don't modify caller's list
1366
1367 def parse_args(self, args=None, values=None):
1368 """
1369 parse_args(args : [string] = sys.argv[1:],
1370 values : Values = None)
1371 -> (values : Values, args : [string])
1372
1373 Parse the command-line options found in 'args' (default:
1374 sys.argv[1:]). Any errors result in a call to 'error()', which
1375 by default prints the usage message to stderr and calls
1376 sys.exit() with an error message. On success returns a pair
1377 (values, args) where 'values' is an Values instance (with all
1378 your option values) and 'args' is the list of arguments left
1379 over after parsing options.
1380 """
1381 rargs = self._get_args(args)
1382 if values is None:
1383 values = self.get_default_values()
1384
1385 # Store the halves of the argument list as attributes for the
1386 # convenience of callbacks:
1387 # rargs
1388 # the rest of the command-line (the "r" stands for
1389 # "remaining" or "right-hand")
1390 # largs
1391 # the leftover arguments -- ie. what's left after removing
1392 # options and their arguments (the "l" stands for "leftover"
1393 # or "left-hand")
1394 self.rargs = rargs
1395 self.largs = largs = []
1396 self.values = values
1397
1398 try:
1399 stop = self._process_args(largs, rargs, values)
1400 except (BadOptionError, OptionValueError), err:
1401 self.error(str(err))
1402
1403 args = largs + rargs
1404 return self.check_values(values, args)
1405
1406 def check_values(self, values, args):
1407 """
1408 check_values(values : Values, args : [string])
1409 -> (values : Values, args : [string])
1410
1411 Check that the supplied option values and leftover arguments are
1412 valid. Returns the option values and leftover arguments
1413 (possibly adjusted, possibly completely new -- whatever you
1414 like). Default implementation just returns the passed-in
1415 values; subclasses may override as desired.
1416 """
1417 return (values, args)
1418
1419 def _process_args(self, largs, rargs, values):
1420 """_process_args(largs : [string],
1421 rargs : [string],
1422 values : Values)
1423
1424 Process command-line arguments and populate 'values', consuming
1425 options and arguments from 'rargs'. If 'allow_interspersed_args' is
1426 false, stop at the first non-option argument. If true, accumulate any
1427 interspersed non-option arguments in 'largs'.
1428 """
1429 while rargs:
1430 arg = rargs[0]
1431 # We handle bare "--" explicitly, and bare "-" is handled by the
1432 # standard arg handler since the short arg case ensures that the
1433 # len of the opt string is greater than 1.
1434 if arg == "--":
1435 del rargs[0]
1436 return
1437 elif arg[0:2] == "--":
1438 # process a single long option (possibly with value(s))
1439 self._process_long_opt(rargs, values)
1440 elif arg[:1] == "-" and len(arg) > 1:
1441 # process a cluster of short options (possibly with
1442 # value(s) for the last one only)
1443 self._process_short_opts(rargs, values)
1444 elif self.allow_interspersed_args:
1445 largs.append(arg)
1446 del rargs[0]
1447 else:
1448 return # stop now, leave this arg in rargs
1449
1450 # Say this is the original argument list:
1451 # [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
1452 # ^
1453 # (we are about to process arg(i)).
1454 #
1455 # Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
1456 # [arg0, ..., arg(i-1)] (any options and their arguments will have
1457 # been removed from largs).
1458 #
1459 # The while loop will usually consume 1 or more arguments per pass.
1460 # If it consumes 1 (eg. arg is an option that takes no arguments),
1461 # then after _process_arg() is done the situation is:
1462 #
1463 # largs = subset of [arg0, ..., arg(i)]
1464 # rargs = [arg(i+1), ..., arg(N-1)]
1465 #
1466 # If allow_interspersed_args is false, largs will always be
1467 # *empty* -- still a subset of [arg0, ..., arg(i-1)], but
1468 # not a very interesting subset!
1469
1470 def _match_long_opt(self, opt):
1471 """_match_long_opt(opt : string) -> string
1472
1473 Determine which long option string 'opt' matches, ie. which one
[391]1474 it is an unambiguous abbreviation for. Raises BadOptionError if
[2]1475 'opt' doesn't unambiguously match any long option string.
1476 """
1477 return _match_abbrev(opt, self._long_opt)
1478
1479 def _process_long_opt(self, rargs, values):
1480 arg = rargs.pop(0)
1481
1482 # Value explicitly attached to arg? Pretend it's the next
1483 # argument.
1484 if "=" in arg:
1485 (opt, next_arg) = arg.split("=", 1)
1486 rargs.insert(0, next_arg)
1487 had_explicit_value = True
1488 else:
1489 opt = arg
1490 had_explicit_value = False
1491
1492 opt = self._match_long_opt(opt)
1493 option = self._long_opt[opt]
1494 if option.takes_value():
1495 nargs = option.nargs
1496 if len(rargs) < nargs:
1497 if nargs == 1:
1498 self.error(_("%s option requires an argument") % opt)
1499 else:
1500 self.error(_("%s option requires %d arguments")
1501 % (opt, nargs))
1502 elif nargs == 1:
1503 value = rargs.pop(0)
1504 else:
1505 value = tuple(rargs[0:nargs])
1506 del rargs[0:nargs]
1507
1508 elif had_explicit_value:
1509 self.error(_("%s option does not take a value") % opt)
1510
1511 else:
1512 value = None
1513
1514 option.process(opt, value, values, self)
1515
1516 def _process_short_opts(self, rargs, values):
1517 arg = rargs.pop(0)
1518 stop = False
1519 i = 1
1520 for ch in arg[1:]:
1521 opt = "-" + ch
1522 option = self._short_opt.get(opt)
1523 i += 1 # we have consumed a character
1524
1525 if not option:
1526 raise BadOptionError(opt)
1527 if option.takes_value():
1528 # Any characters left in arg? Pretend they're the
1529 # next arg, and stop consuming characters of arg.
1530 if i < len(arg):
1531 rargs.insert(0, arg[i:])
1532 stop = True
1533
1534 nargs = option.nargs
1535 if len(rargs) < nargs:
1536 if nargs == 1:
1537 self.error(_("%s option requires an argument") % opt)
1538 else:
1539 self.error(_("%s option requires %d arguments")
1540 % (opt, nargs))
1541 elif nargs == 1:
1542 value = rargs.pop(0)
1543 else:
1544 value = tuple(rargs[0:nargs])
1545 del rargs[0:nargs]
1546
1547 else: # option doesn't take a value
1548 value = None
1549
1550 option.process(opt, value, values, self)
1551
1552 if stop:
1553 break
1554
1555
1556 # -- Feedback methods ----------------------------------------------
1557
1558 def get_prog_name(self):
1559 if self.prog is None:
1560 return os.path.basename(sys.argv[0])
1561 else:
1562 return self.prog
1563
1564 def expand_prog_name(self, s):
1565 return s.replace("%prog", self.get_prog_name())
1566
1567 def get_description(self):
1568 return self.expand_prog_name(self.description)
1569
1570 def exit(self, status=0, msg=None):
1571 if msg:
1572 sys.stderr.write(msg)
1573 sys.exit(status)
1574
1575 def error(self, msg):
1576 """error(msg : string)
1577
1578 Print a usage message incorporating 'msg' to stderr and exit.
1579 If you override this in a subclass, it should not return -- it
1580 should either exit or raise an exception.
1581 """
1582 self.print_usage(sys.stderr)
1583 self.exit(2, "%s: error: %s\n" % (self.get_prog_name(), msg))
1584
1585 def get_usage(self):
1586 if self.usage:
1587 return self.formatter.format_usage(
1588 self.expand_prog_name(self.usage))
1589 else:
1590 return ""
1591
1592 def print_usage(self, file=None):
1593 """print_usage(file : file = stdout)
1594
1595 Print the usage message for the current program (self.usage) to
1596 'file' (default stdout). Any occurrence of the string "%prog" in
1597 self.usage is replaced with the name of the current program
1598 (basename of sys.argv[0]). Does nothing if self.usage is empty
1599 or not defined.
1600 """
1601 if self.usage:
1602 print >>file, self.get_usage()
1603
1604 def get_version(self):
1605 if self.version:
1606 return self.expand_prog_name(self.version)
1607 else:
1608 return ""
1609
1610 def print_version(self, file=None):
1611 """print_version(file : file = stdout)
1612
1613 Print the version message for this program (self.version) to
1614 'file' (default stdout). As with print_usage(), any occurrence
1615 of "%prog" in self.version is replaced by the current program's
1616 name. Does nothing if self.version is empty or undefined.
1617 """
1618 if self.version:
1619 print >>file, self.get_version()
1620
1621 def format_option_help(self, formatter=None):
1622 if formatter is None:
1623 formatter = self.formatter
1624 formatter.store_option_strings(self)
1625 result = []
1626 result.append(formatter.format_heading(_("Options")))
1627 formatter.indent()
1628 if self.option_list:
1629 result.append(OptionContainer.format_option_help(self, formatter))
1630 result.append("\n")
1631 for group in self.option_groups:
1632 result.append(group.format_help(formatter))
1633 result.append("\n")
1634 formatter.dedent()
1635 # Drop the last "\n", or the header if no options or option groups:
1636 return "".join(result[:-1])
1637
1638 def format_epilog(self, formatter):
1639 return formatter.format_epilog(self.epilog)
1640
1641 def format_help(self, formatter=None):
1642 if formatter is None:
1643 formatter = self.formatter
1644 result = []
1645 if self.usage:
1646 result.append(self.get_usage() + "\n")
1647 if self.description:
1648 result.append(self.format_description(formatter) + "\n")
1649 result.append(self.format_option_help(formatter))
1650 result.append(self.format_epilog(formatter))
1651 return "".join(result)
1652
1653 # used by test suite
1654 def _get_encoding(self, file):
1655 encoding = getattr(file, "encoding", None)
1656 if not encoding:
1657 encoding = sys.getdefaultencoding()
1658 return encoding
1659
1660 def print_help(self, file=None):
1661 """print_help(file : file = stdout)
1662
1663 Print an extended help message, listing all options and any
1664 help text provided with them, to 'file' (default stdout).
1665 """
1666 if file is None:
1667 file = sys.stdout
1668 encoding = self._get_encoding(file)
1669 file.write(self.format_help().encode(encoding, "replace"))
1670
1671# class OptionParser
1672
1673
1674def _match_abbrev(s, wordmap):
1675 """_match_abbrev(s : string, wordmap : {string : Option}) -> string
1676
1677 Return the string key in 'wordmap' for which 's' is an unambiguous
1678 abbreviation. If 's' is found to be ambiguous or doesn't match any of
1679 'words', raise BadOptionError.
1680 """
1681 # Is there an exact match?
1682 if s in wordmap:
1683 return s
1684 else:
1685 # Isolate all words with s as a prefix.
1686 possibilities = [word for word in wordmap.keys()
1687 if word.startswith(s)]
1688 # No exact match, so there had better be just one possibility.
1689 if len(possibilities) == 1:
1690 return possibilities[0]
1691 elif not possibilities:
1692 raise BadOptionError(s)
1693 else:
1694 # More than one possible completion: ambiguous prefix.
1695 possibilities.sort()
1696 raise AmbiguousOptionError(s, possibilities)
1697
1698
1699# Some day, there might be many Option classes. As of Optik 1.3, the
1700# preferred way to instantiate Options is indirectly, via make_option(),
1701# which will become a factory function when there are many Option
1702# classes.
1703make_option = Option
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