You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
471 lines
18 KiB
471 lines
18 KiB
"""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
|
|
"""
|
|
|
|
import sys
|
|
import string
|
|
import re
|
|
import getopt
|
|
from .errors import DistutilsGetoptError, DistutilsArgError
|
|
|
|
# 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$' % longopt_pat)
|
|
|
|
# For recognizing "negative alias" options, eg. "quiet=!verbose"
|
|
neg_alias_re = re.compile("^({})=!({})$".format(longopt_pat, longopt_pat))
|
|
|
|
# This is used to translate long options to legitimate Python identifiers
|
|
# (for use as attributes of some object).
|
|
longopt_xlate = str.maketrans('-', '_')
|
|
|
|
|
|
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 tuples. The
|
|
# tuples may have 3 or four values:
|
|
# (long_option, short_option, help_string [, repeatable])
|
|
# 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 = []
|
|
|
|
def _build_index(self):
|
|
self.option_index.clear()
|
|
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 long_option in self.option_index:
|
|
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 long_option in self.option_index
|
|
|
|
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 long_option.translate(longopt_xlate)
|
|
|
|
def _check_alias_dict(self, aliases, what):
|
|
assert isinstance(aliases, dict)
|
|
for alias, opt in aliases.items():
|
|
if alias not in self.option_index:
|
|
raise DistutilsGetoptError(
|
|
("invalid %s '%s': " "option '%s' not defined")
|
|
% (what, alias, alias)
|
|
)
|
|
if opt not in self.option_index:
|
|
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): # noqa: C901
|
|
"""Populate the various data structures that keep tabs on the
|
|
option table. Called by 'getopt()' before it can do anything
|
|
worthwhile.
|
|
"""
|
|
self.long_opts = []
|
|
self.short_opts = []
|
|
self.short2long.clear()
|
|
self.repeat = {}
|
|
|
|
for option in self.option_table:
|
|
if len(option) == 3:
|
|
long, short, help = option
|
|
repeat = 0
|
|
elif len(option) == 4:
|
|
long, short, help, repeat = option
|
|
else:
|
|
# the option table is part of the code, so simply
|
|
# assert that it is correct
|
|
raise ValueError("invalid option tuple: {!r}".format(option))
|
|
|
|
# Type- and value-check the option names
|
|
if not isinstance(long, str) or len(long) < 2:
|
|
raise DistutilsGetoptError(
|
|
("invalid long option '%s': " "must be a string of length >= 2")
|
|
% long
|
|
)
|
|
|
|
if not ((short is None) or (isinstance(short, str) and len(short) == 1)):
|
|
raise DistutilsGetoptError(
|
|
"invalid short option '%s': "
|
|
"must a single character or None" % short
|
|
)
|
|
|
|
self.repeat[long] = repeat
|
|
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
|
|
|
|
# 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
|
|
|
|
def getopt(self, args=None, object=None): # noqa: C901
|
|
"""Parse command-line options in args. Store as attributes on 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 = True
|
|
else:
|
|
created_object = False
|
|
|
|
self._grok_option_table()
|
|
|
|
short_opts = ' '.join(self.short_opts)
|
|
try:
|
|
opts, args = getopt.getopt(args, short_opts, self.long_opts)
|
|
except getopt.error as 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]]
|
|
else:
|
|
assert len(opt) > 2 and opt[:2] == '--'
|
|
opt = opt[2:]
|
|
|
|
alias = self.alias.get(opt)
|
|
if alias:
|
|
opt = alias
|
|
|
|
if not self.takes_arg[opt]: # boolean option?
|
|
assert val == '', "boolean option can't have value"
|
|
alias = self.negative_alias.get(opt)
|
|
if alias:
|
|
opt = alias
|
|
val = 0
|
|
else:
|
|
val = 1
|
|
|
|
attr = self.attr_name[opt]
|
|
# The only repeating option at the moment is 'verbose'.
|
|
# It has a negative option -q quiet, which should set verbose = 0.
|
|
if val and self.repeat.get(attr) is not None:
|
|
val = getattr(object, attr, 0) + 1
|
|
setattr(object, attr, val)
|
|
self.option_order.append((opt, val))
|
|
|
|
# for opts
|
|
if created_object:
|
|
return args, object
|
|
else:
|
|
return args
|
|
|
|
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): # noqa: C901
|
|
"""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]
|
|
ell = len(long)
|
|
if long[-1] == '=':
|
|
ell = ell - 1
|
|
if short is not None:
|
|
ell = ell + 5 # " (-x)" where short == 'x'
|
|
if ell > max_opt:
|
|
max_opt = ell
|
|
|
|
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 option in self.option_table:
|
|
long, short, help = option[:3]
|
|
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 = "{} (-{})".format(long, short)
|
|
if text:
|
|
lines.append(" --%-*s %s" % (max_opt, opt_names, text[0]))
|
|
else:
|
|
lines.append(" --%-*s" % opt_names)
|
|
|
|
for ell in text[1:]:
|
|
lines.append(big_indent + ell)
|
|
return lines
|
|
|
|
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")
|
|
|
|
|
|
def fancy_getopt(options, negative_opt, object, args):
|
|
parser = FancyGetopt(options)
|
|
parser.set_negative_aliases(negative_opt)
|
|
return parser.getopt(args, object)
|
|
|
|
|
|
WS_TRANS = {ord(_wschar): ' ' for _wschar in string.whitespace}
|
|
|
|
|
|
def wrap_text(text, width):
|
|
"""wrap_text(text : string, width : int) -> [string]
|
|
|
|
Split 'text' into multiple lines of no more than 'width' characters
|
|
each, and return the list of strings that results.
|
|
"""
|
|
if text is None:
|
|
return []
|
|
if len(text) <= width:
|
|
return [text]
|
|
|
|
text = text.expandtabs()
|
|
text = text.translate(WS_TRANS)
|
|
chunks = re.split(r'( +|-+)', text)
|
|
chunks = [ch for ch in chunks if ch] # ' - ' results in empty strings
|
|
lines = []
|
|
|
|
while chunks:
|
|
cur_line = [] # list of chunks (to-be-joined)
|
|
cur_len = 0 # length of current line
|
|
|
|
while chunks:
|
|
ell = len(chunks[0])
|
|
if cur_len + ell <= width: # can squeeze (at least) this chunk in
|
|
cur_line.append(chunks[0])
|
|
del chunks[0]
|
|
cur_len = cur_len + ell
|
|
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(''.join(cur_line))
|
|
|
|
return lines
|
|
|
|
|
|
def translate_longopt(opt):
|
|
"""Convert a long option name to a valid Python identifier by
|
|
changing "-" to "_".
|
|
"""
|
|
return opt.translate(longopt_xlate)
|
|
|
|
|
|
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)
|
|
|
|
|
|
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("\n".join(wrap_text(text, w)))
|
|
print()
|