1 """A powerful, extensible, and easy-to-use option parser. 2 3 By Greg Ward <gward (at] python.net> 4 5 Originally distributed as Optik. 6 7 For support, use the optik-users (at] lists.sourceforge.net mailing list 8 (http://lists.sourceforge.net/lists/listinfo/optik-users). 9 10 Simple 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__ = """ 44 Copyright (c) 2001-2006 Gregory P. Ward. All rights reserved. 45 Copyright (c) 2002-2006 Python Software Foundation. All rights reserved. 46 47 Redistribution and use in source and binary forms, with or without 48 modification, are permitted provided that the following conditions are 49 met: 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 62 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 63 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 64 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 65 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR 66 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 67 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 68 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 69 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 70 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 71 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 72 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 73 """ 74 75 import sys, os 76 import types 77 import textwrap 78 79 def _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 89 try: 90 from gettext import gettext 91 except ImportError: 92 def gettext(message): 93 return message 94 _ = gettext 95 96 97 class OptParseError (Exception): 98 def __init__(self, msg): 99 self.msg = msg 100 101 def __str__(self): 102 return self.msg 103 104 105 class 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 120 121 class OptionConflictError (OptionError): 122 """ 123 Raised if conflicting options are added to an OptionParser. 124 """ 125 126 class OptionValueError (OptParseError): 127 """ 128 Raised if an invalid option value is encountered on the command 129 line. 130 """ 131 132 class 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 141 142 class 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))) 153 154 155 class 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) 360 361 class 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) 378 379 380 class 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)) 397 398 399 def _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) 411 412 def _parse_int(val): 413 return _parse_num(val, int) 414 415 def _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")) } 422 423 def 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)) 430 431 def 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. 442 NO_DEFAULT = ("NO", "DEFAULT") 443 444 445 class 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: 816 raise ValueError("unknown action %r" % self.action) 817 818 return 1 819 820 # class Option 821 822 823 SUPPRESS_HELP = "SUPPRESS"+"HELP" 824 SUPPRESS_USAGE = "SUPPRESS"+"USAGE" 825 826 try: 827 basestring 828 except NameError: 829 def isbasestring(x): 830 return isinstance(x, (types.StringType, types.UnicodeType)) 831 else: 832 def isbasestring(x): 833 return isinstance(x, basestring) 834 835 class 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) 898 899 900 class 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 1088 class 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 1118 class 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])). 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). 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 1474 it is an unambiguous abbrevation for. Raises BadOptionError if 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 1674 def _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. 1703 make_option = Option 1704
