mirror of
https://github.com/python/cpython.git
synced 2024-11-24 08:52:25 +01:00
489 lines
17 KiB
Python
489 lines
17 KiB
Python
"""distutils.fancy_getopt
|
|
|
|
Wrapper around the standard getopt module that provides the following
|
|
additional features:
|
|
* short and long options are tied together
|
|
* options have help strings, so fancy_getopt could potentially
|
|
create a complete usage summary
|
|
* options set attributes of a passed-in object
|
|
"""
|
|
|
|
# created 1999/03/03, Greg Ward
|
|
|
|
__revision__ = "$Id$"
|
|
|
|
import sys, string, re
|
|
from types import *
|
|
import getopt
|
|
from distutils.errors import *
|
|
|
|
# Much like command_re in distutils.core, this is close to but not quite
|
|
# the same as a Python NAME -- except, in the spirit of most GNU
|
|
# utilities, we use '-' in place of '_'. (The spirit of LISP lives on!)
|
|
# The similarities to NAME are again not a coincidence...
|
|
longopt_pat = r'[a-zA-Z](?:[a-zA-Z0-9-]*)'
|
|
longopt_re = re.compile (r'^%s$' % longopt_pat)
|
|
|
|
# For recognizing "negative alias" options, eg. "quiet=!verbose"
|
|
neg_alias_re = re.compile ("^(%s)=!(%s)$" % (longopt_pat, longopt_pat))
|
|
|
|
# This is used to translate long options to legitimate Python identifiers
|
|
# (for use as attributes of some object).
|
|
longopt_xlate = string.maketrans ('-', '_')
|
|
|
|
# This records (option, value) pairs in the order seen on the command line;
|
|
# it's close to what getopt.getopt() returns, but with short options
|
|
# expanded. (Ugh, this module should be OO-ified.)
|
|
_option_order = None
|
|
|
|
|
|
class FancyGetopt:
|
|
"""Wrapper around the standard 'getopt()' module that provides some
|
|
handy extra functionality:
|
|
* short and long options are tied together
|
|
* options have help strings, and help text can be assembled
|
|
from them
|
|
* options set attributes of a passed-in object
|
|
* boolean options can have "negative aliases" -- eg. if
|
|
--quiet is the "negative alias" of --verbose, then "--quiet"
|
|
on the command line sets 'verbose' to false
|
|
"""
|
|
|
|
def __init__ (self, option_table=None):
|
|
|
|
# The option table is (currently) a list of 3-tuples:
|
|
# (long_option, short_option, help_string)
|
|
# if an option takes an argument, its long_option should have '='
|
|
# appended; short_option should just be a single character, no ':'
|
|
# in any case. If a long_option doesn't have a corresponding
|
|
# short_option, short_option should be None. All option tuples
|
|
# must have long options.
|
|
self.option_table = option_table
|
|
|
|
# 'option_index' maps long option names to entries in the option
|
|
# table (ie. those 3-tuples).
|
|
self.option_index = {}
|
|
if self.option_table:
|
|
self._build_index()
|
|
|
|
# 'alias' records (duh) alias options; {'foo': 'bar'} means
|
|
# --foo is an alias for --bar
|
|
self.alias = {}
|
|
|
|
# 'negative_alias' keeps track of options that are the boolean
|
|
# opposite of some other option
|
|
self.negative_alias = {}
|
|
|
|
# These keep track of the information in the option table. We
|
|
# don't actually populate these structures until we're ready to
|
|
# parse the command-line, since the 'option_table' passed in here
|
|
# isn't necessarily the final word.
|
|
self.short_opts = []
|
|
self.long_opts = []
|
|
self.short2long = {}
|
|
self.attr_name = {}
|
|
self.takes_arg = {}
|
|
|
|
# And 'option_order' is filled up in 'getopt()'; it records the
|
|
# original order of options (and their values) on the command-line,
|
|
# but expands short options, converts aliases, etc.
|
|
self.option_order = []
|
|
|
|
# __init__ ()
|
|
|
|
|
|
def _build_index (self):
|
|
for option in self.option_table:
|
|
self.option_index[option[0]] = option
|
|
|
|
def set_option_table (self, option_table):
|
|
self.option_table = option_table
|
|
self._build_index()
|
|
|
|
def add_option (self, long_option, short_option=None, help_string=None):
|
|
if self.option_index.has_key(long_option):
|
|
raise DistutilsGetoptError, \
|
|
"option conflict: already an option '%s'" % long_option
|
|
else:
|
|
option = (long_option, short_option, help_string)
|
|
self.option_table.append (option)
|
|
self.option_index[long_option] = option
|
|
|
|
|
|
def has_option (self, long_option):
|
|
"""Return true if the option table for this parser has an
|
|
option with long name 'long_option'."""
|
|
return self.option_index.has_key(long_option)
|
|
|
|
def get_attr_name (self, long_option):
|
|
"""Translate long option name 'long_option' to the form it
|
|
has as an attribute of some object: ie., translate hyphens
|
|
to underscores."""
|
|
return string.translate (long_option, longopt_xlate)
|
|
|
|
|
|
def _check_alias_dict (self, aliases, what):
|
|
assert type(aliases) is DictionaryType
|
|
for (alias, opt) in aliases.items():
|
|
if not self.option_index.has_key(alias):
|
|
raise DistutilsGetoptError, \
|
|
("invalid %s '%s': "
|
|
"option '%s' not defined") % (what, alias, alias)
|
|
if not self.option_index.has_key(opt):
|
|
raise DistutilsGetoptError, \
|
|
("invalid %s '%s': "
|
|
"aliased option '%s' not defined") % (what, alias, opt)
|
|
|
|
def set_aliases (self, alias):
|
|
"""Set the aliases for this option parser."""
|
|
self._check_alias_dict (alias, "alias")
|
|
self.alias = alias
|
|
|
|
def set_negative_aliases (self, negative_alias):
|
|
"""Set the negative aliases for this option parser.
|
|
'negative_alias' should be a dictionary mapping option names to
|
|
option names, both the key and value must already be defined
|
|
in the option table."""
|
|
self._check_alias_dict (negative_alias, "negative alias")
|
|
self.negative_alias = negative_alias
|
|
|
|
|
|
def _grok_option_table (self):
|
|
"""Populate the various data structures that keep tabs on
|
|
the option table. Called by 'getopt()' before it can do
|
|
anything worthwhile."""
|
|
|
|
for option in self.option_table:
|
|
try:
|
|
(long, short, help) = option
|
|
except ValueError:
|
|
raise DistutilsGetoptError, \
|
|
"invalid option tuple " + str (option)
|
|
|
|
# Type- and value-check the option names
|
|
if type(long) is not StringType or len(long) < 2:
|
|
raise DistutilsGetoptError, \
|
|
("invalid long option '%s': "
|
|
"must be a string of length >= 2") % long
|
|
|
|
if (not ((short is None) or
|
|
(type (short) is StringType and len (short) == 1))):
|
|
raise DistutilsGetoptError, \
|
|
("invalid short option '%s': "
|
|
"must a single character or None") % short
|
|
|
|
self.long_opts.append (long)
|
|
|
|
if long[-1] == '=': # option takes an argument?
|
|
if short: short = short + ':'
|
|
long = long[0:-1]
|
|
self.takes_arg[long] = 1
|
|
else:
|
|
|
|
# Is option is a "negative alias" for some other option (eg.
|
|
# "quiet" == "!verbose")?
|
|
alias_to = self.negative_alias.get(long)
|
|
if alias_to is not None:
|
|
if self.takes_arg[alias_to]:
|
|
raise DistutilsGetoptError, \
|
|
("invalid negative alias '%s': "
|
|
"aliased option '%s' takes a value") % \
|
|
(long, alias_to)
|
|
|
|
self.long_opts[-1] = long # XXX redundant?!
|
|
self.takes_arg[long] = 0
|
|
|
|
else:
|
|
self.takes_arg[long] = 0
|
|
|
|
# If this is an alias option, make sure its "takes arg" flag is
|
|
# the same as the option it's aliased to.
|
|
alias_to = self.alias.get(long)
|
|
if alias_to is not None:
|
|
if self.takes_arg[long] != self.takes_arg[alias_to]:
|
|
raise DistutilsGetoptError, \
|
|
("invalid alias '%s': inconsistent with "
|
|
"aliased option '%s' (one of them takes a value, "
|
|
"the other doesn't") % (long, alias_to)
|
|
|
|
|
|
# Now enforce some bondage on the long option name, so we can
|
|
# later translate it to an attribute name on some object. Have
|
|
# to do this a bit late to make sure we've removed any trailing
|
|
# '='.
|
|
if not longopt_re.match (long):
|
|
raise DistutilsGetoptError, \
|
|
("invalid long option name '%s' " +
|
|
"(must be letters, numbers, hyphens only") % long
|
|
|
|
self.attr_name[long] = self.get_attr_name (long)
|
|
if short:
|
|
self.short_opts.append (short)
|
|
self.short2long[short[0]] = long
|
|
|
|
# for option_table
|
|
|
|
# _grok_option_table()
|
|
|
|
|
|
def getopt (self, args=None, object=None):
|
|
"""Parse the command-line options in 'args' and store the results
|
|
as attributes of 'object'. If 'args' is None or not supplied, uses
|
|
'sys.argv[1:]'. If 'object' is None or not supplied, creates a new
|
|
OptionDummy object, stores option values there, and returns a tuple
|
|
(args, object). If 'object' is supplied, it is modified in place
|
|
and 'getopt()' just returns 'args'; in both cases, the returned
|
|
'args' is a modified copy of the passed-in 'args' list, which is
|
|
left untouched."""
|
|
|
|
if args is None:
|
|
args = sys.argv[1:]
|
|
if object is None:
|
|
object = OptionDummy()
|
|
created_object = 1
|
|
else:
|
|
created_object = 0
|
|
|
|
self._grok_option_table()
|
|
|
|
short_opts = string.join (self.short_opts)
|
|
try:
|
|
(opts, args) = getopt.getopt (args, short_opts, self.long_opts)
|
|
except getopt.error, msg:
|
|
raise DistutilsArgError, msg
|
|
|
|
for (opt, val) in opts:
|
|
if len (opt) == 2 and opt[0] == '-': # it's a short option
|
|
opt = self.short2long[opt[1]]
|
|
|
|
elif len (opt) > 2 and opt[0:2] == '--':
|
|
opt = opt[2:]
|
|
|
|
else:
|
|
raise DistutilsInternalError, \
|
|
"this can't happen: bad option string '%s'" % opt
|
|
|
|
alias = self.alias.get(opt)
|
|
if alias:
|
|
opt = alias
|
|
|
|
if not self.takes_arg[opt]: # boolean option?
|
|
if val != '': # shouldn't have a value!
|
|
raise DistutilsInternalError, \
|
|
"this can't happen: bad option value '%s'" % value
|
|
|
|
alias = self.negative_alias.get (opt)
|
|
if alias:
|
|
opt = alias
|
|
val = 0
|
|
else:
|
|
val = 1
|
|
|
|
attr = self.attr_name[opt]
|
|
setattr (object, attr, val)
|
|
self.option_order.append ((opt, val))
|
|
|
|
# for opts
|
|
|
|
if created_object:
|
|
return (args, object)
|
|
else:
|
|
return args
|
|
|
|
# getopt()
|
|
|
|
|
|
def get_option_order (self):
|
|
"""Returns the list of (option, value) tuples processed by the
|
|
previous run of 'getopt()'. Raises RuntimeError if
|
|
'getopt()' hasn't been called yet."""
|
|
|
|
if self.option_order is None:
|
|
raise RuntimeError, "'getopt()' hasn't been called yet"
|
|
else:
|
|
return self.option_order
|
|
|
|
|
|
def generate_help (self, header=None):
|
|
"""Generate help text (a list of strings, one per suggested line of
|
|
output) from the option table for this FancyGetopt object."""
|
|
|
|
# Blithely assume the option table is good: probably wouldn't call
|
|
# 'generate_help()' unless you've already called 'getopt()'.
|
|
|
|
# First pass: determine maximum length of long option names
|
|
max_opt = 0
|
|
for option in self.option_table:
|
|
long = option[0]
|
|
short = option[1]
|
|
l = len (long)
|
|
if long[-1] == '=':
|
|
l = l - 1
|
|
if short is not None:
|
|
l = l + 5 # " (-x)" where short == 'x'
|
|
if l > max_opt:
|
|
max_opt = l
|
|
|
|
opt_width = max_opt + 2 + 2 + 2 # room for indent + dashes + gutter
|
|
|
|
# Typical help block looks like this:
|
|
# --foo controls foonabulation
|
|
# Help block for longest option looks like this:
|
|
# --flimflam set the flim-flam level
|
|
# and with wrapped text:
|
|
# --flimflam set the flim-flam level (must be between
|
|
# 0 and 100, except on Tuesdays)
|
|
# Options with short names will have the short name shown (but
|
|
# it doesn't contribute to max_opt):
|
|
# --foo (-f) controls foonabulation
|
|
# If adding the short option would make the left column too wide,
|
|
# we push the explanation off to the next line
|
|
# --flimflam (-l)
|
|
# set the flim-flam level
|
|
# Important parameters:
|
|
# - 2 spaces before option block start lines
|
|
# - 2 dashes for each long option name
|
|
# - min. 2 spaces between option and explanation (gutter)
|
|
# - 5 characters (incl. space) for short option name
|
|
|
|
# Now generate lines of help text. (If 80 columns were good enough
|
|
# for Jesus, then 78 columns are good enough for me!)
|
|
line_width = 78
|
|
text_width = line_width - opt_width
|
|
big_indent = ' ' * opt_width
|
|
if header:
|
|
lines = [header]
|
|
else:
|
|
lines = ['Option summary:']
|
|
|
|
for (long,short,help) in self.option_table:
|
|
|
|
text = wrap_text (help, text_width)
|
|
if long[-1] == '=':
|
|
long = long[0:-1]
|
|
|
|
# Case 1: no short option at all (makes life easy)
|
|
if short is None:
|
|
if text:
|
|
lines.append (" --%-*s %s" % (max_opt, long, text[0]))
|
|
else:
|
|
lines.append (" --%-*s " % (max_opt, long))
|
|
|
|
# Case 2: we have a short option, so we have to include it
|
|
# just after the long option
|
|
else:
|
|
opt_names = "%s (-%s)" % (long, short)
|
|
if text:
|
|
lines.append (" --%-*s %s" %
|
|
(max_opt, opt_names, text[0]))
|
|
else:
|
|
lines.append (" --%-*s" % opt_names)
|
|
|
|
for l in text[1:]:
|
|
lines.append (big_indent + l)
|
|
|
|
# for self.option_table
|
|
|
|
return lines
|
|
|
|
# generate_help ()
|
|
|
|
def print_help (self, header=None, file=None):
|
|
if file is None:
|
|
file = sys.stdout
|
|
for line in self.generate_help (header):
|
|
file.write (line + "\n")
|
|
# print_help ()
|
|
|
|
# class FancyGetopt
|
|
|
|
|
|
def fancy_getopt (options, negative_opt, object, args):
|
|
parser = FancyGetopt (options)
|
|
parser.set_negative_aliases (negative_opt)
|
|
return parser.getopt (args, object)
|
|
|
|
|
|
WS_TRANS = string.maketrans (string.whitespace, ' ' * len (string.whitespace))
|
|
|
|
def wrap_text (text, width):
|
|
|
|
if text is None:
|
|
return []
|
|
if len (text) <= width:
|
|
return [text]
|
|
|
|
text = string.expandtabs (text)
|
|
text = string.translate (text, WS_TRANS)
|
|
chunks = re.split (r'( +|-+)', text)
|
|
chunks = filter (None, chunks) # ' - ' results in empty strings
|
|
lines = []
|
|
|
|
while chunks:
|
|
|
|
cur_line = [] # list of chunks (to-be-joined)
|
|
cur_len = 0 # length of current line
|
|
|
|
while chunks:
|
|
l = len (chunks[0])
|
|
if cur_len + l <= width: # can squeeze (at least) this chunk in
|
|
cur_line.append (chunks[0])
|
|
del chunks[0]
|
|
cur_len = cur_len + l
|
|
else: # this line is full
|
|
# drop last chunk if all space
|
|
if cur_line and cur_line[-1][0] == ' ':
|
|
del cur_line[-1]
|
|
break
|
|
|
|
if chunks: # any chunks left to process?
|
|
|
|
# if the current line is still empty, then we had a single
|
|
# chunk that's too big too fit on a line -- so we break
|
|
# down and break it up at the line width
|
|
if cur_len == 0:
|
|
cur_line.append (chunks[0][0:width])
|
|
chunks[0] = chunks[0][width:]
|
|
|
|
# all-whitespace chunks at the end of a line can be discarded
|
|
# (and we know from the re.split above that if a chunk has
|
|
# *any* whitespace, it is *all* whitespace)
|
|
if chunks[0][0] == ' ':
|
|
del chunks[0]
|
|
|
|
# and store this line in the list-of-all-lines -- as a single
|
|
# string, of course!
|
|
lines.append (string.join (cur_line, ''))
|
|
|
|
# while chunks
|
|
|
|
return lines
|
|
|
|
# wrap_text ()
|
|
|
|
|
|
class OptionDummy:
|
|
"""Dummy class just used as a place to hold command-line option
|
|
values as instance attributes."""
|
|
|
|
def __init__ (self, options=[]):
|
|
"""Create a new OptionDummy instance. The attributes listed in
|
|
'options' will be initialized to None."""
|
|
for opt in options:
|
|
setattr(self, opt, None)
|
|
|
|
# class OptionDummy
|
|
|
|
|
|
if __name__ == "__main__":
|
|
text = """\
|
|
Tra-la-la, supercalifragilisticexpialidocious.
|
|
How *do* you spell that odd word, anyways?
|
|
(Someone ask Mary -- she'll know [or she'll
|
|
say, "How should I know?"].)"""
|
|
|
|
for w in (10, 20, 30, 40):
|
|
print "width: %d" % w
|
|
print string.join (wrap_text (text, w), "\n")
|
|
print
|