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44f8e4ea08
'generate_help()', 'wrap_text()' functions, and a little tiny test of 'wrap_text()'. Changed how caller states that one option is the boolean opposite of another: added 'negative_opt' parameter to 'fancy_getopt()', and changed to use it instead of parsing long option name.
311 lines
10 KiB
Python
311 lines
10 KiB
Python
"""distutils.fancy_getopt
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Wrapper around the standard getopt module that provides the following
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additional features:
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* short and long options are tied together
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* options have help strings, so fancy_getopt could potentially
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create a complete usage summary
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* options set attributes of a passed-in object
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"""
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# created 1999/03/03, Greg Ward
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__rcsid__ = "$Id$"
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import sys, string, re
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from types import *
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import getopt
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from distutils.errors import *
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# Much like command_re in distutils.core, this is close to but not quite
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# the same as a Python NAME -- except, in the spirit of most GNU
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# utilities, we use '-' in place of '_'. (The spirit of LISP lives on!)
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# The similarities to NAME are again not a coincidence...
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longopt_pat = r'[a-zA-Z](?:[a-zA-Z0-9-]*)'
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longopt_re = re.compile (r'^%s$' % longopt_pat)
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# For recognizing "negative alias" options, eg. "quiet=!verbose"
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neg_alias_re = re.compile ("^(%s)=!(%s)$" % (longopt_pat, longopt_pat))
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# This is used to translate long options to legitimate Python identifiers
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# (for use as attributes of some object).
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longopt_xlate = string.maketrans ('-', '_')
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def fancy_getopt (options, negative_opt, object, args):
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# The 'options' table is a list of 3-tuples:
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# (long_option, short_option, help_string)
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# if an option takes an argument, its long_option should have '='
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# appended; short_option should just be a single character, no ':' in
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# any case. If a long_option doesn't have a corresponding
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# short_option, short_option should be None. All option tuples must
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# have long options.
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# Build the short_opts string and long_opts list, remembering how
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# the two are tied together
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short_opts = [] # we'll join 'em when done
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long_opts = []
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short2long = {}
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attr_name = {}
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takes_arg = {}
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for option in options:
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try:
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(long, short, help) = option
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except ValueError:
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raise DistutilsGetoptError, \
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"invalid option tuple " + str (option)
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# Type-check the option names
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if type (long) is not StringType or len (long) < 2:
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raise DistutilsGetoptError, \
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"long option '%s' must be a string of length >= 2" % \
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long
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if (not ((short is None) or
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(type (short) is StringType and len (short) == 1))):
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raise DistutilsGetoptError, \
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"short option '%s' must be None or string of length 1" % \
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short
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long_opts.append (long)
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if long[-1] == '=': # option takes an argument?
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if short: short = short + ':'
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long = long[0:-1]
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takes_arg[long] = 1
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else:
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# Is option is a "negative alias" for some other option (eg.
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# "quiet" == "!verbose")?
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alias_to = negative_opt.get(long)
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if alias_to is not None:
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if not takes_arg.has_key(alias_to) or takes_arg[alias_to]:
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raise DistutilsGetoptError, \
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("option '%s' is a negative alias for '%s', " +
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"which either hasn't been defined yet " +
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"or takes an argument") % (long, alias_to)
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long_opts[-1] = long
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takes_arg[long] = 0
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else:
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takes_arg[long] = 0
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# Now enforce some bondage on the long option name, so we can later
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# translate it to an attribute name in 'object'. Have to do this a
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# bit late to make sure we've removed any trailing '='.
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if not longopt_re.match (long):
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raise DistutilsGetoptError, \
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("invalid long option name '%s' " +
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"(must be letters, numbers, hyphens only") % long
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attr_name[long] = string.translate (long, longopt_xlate)
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if short:
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short_opts.append (short)
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short2long[short[0]] = long
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# end loop over 'options'
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short_opts = string.join (short_opts)
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try:
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(opts, args) = getopt.getopt (args, short_opts, long_opts)
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except getopt.error, msg:
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raise DistutilsArgError, msg
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for (opt, val) in opts:
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if len (opt) == 2 and opt[0] == '-': # it's a short option
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opt = short2long[opt[1]]
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elif len (opt) > 2 and opt[0:2] == '--':
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opt = opt[2:]
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else:
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raise RuntimeError, "getopt lies! (bad option string '%s')" % \
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opt
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attr = attr_name[opt]
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if takes_arg[opt]:
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setattr (object, attr, val)
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else:
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if val == '':
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alias = negative_opt.get (opt)
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if alias:
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setattr (object, attr_name[alias], 0)
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else:
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setattr (object, attr, 1)
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else:
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raise RuntimeError, "getopt lies! (bad value '%s')" % value
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# end loop over options found in 'args'
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return args
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# fancy_getopt()
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WS_TRANS = string.maketrans (string.whitespace, ' ' * len (string.whitespace))
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def wrap_text (text, width):
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if text is None:
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return []
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if len (text) <= width:
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return [text]
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text = string.expandtabs (text)
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text = string.translate (text, WS_TRANS)
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chunks = re.split (r'( +|-+)', text)
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chunks = filter (None, chunks) # ' - ' results in empty strings
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lines = []
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while chunks:
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cur_line = [] # list of chunks (to-be-joined)
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cur_len = 0 # length of current line
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while chunks:
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l = len (chunks[0])
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if cur_len + l <= width: # can squeeze (at least) this chunk in
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cur_line.append (chunks[0])
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del chunks[0]
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cur_len = cur_len + l
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else: # this line is full
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# drop last chunk if all space
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if cur_line and cur_line[-1][0] == ' ':
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del cur_line[-1]
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break
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if chunks: # any chunks left to process?
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# if the current line is still empty, then we had a single
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# chunk that's too big too fit on a line -- so we break
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# down and break it up at the line width
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if cur_len == 0:
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cur_line.append (chunks[0][0:width])
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chunks[0] = chunks[0][width:]
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# all-whitespace chunks at the end of a line can be discarded
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# (and we know from the re.split above that if a chunk has
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# *any* whitespace, it is *all* whitespace)
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if chunks[0][0] == ' ':
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del chunks[0]
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# and store this line in the list-of-all-lines -- as a single
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# string, of course!
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lines.append (string.join (cur_line, ''))
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# while chunks
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return lines
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# wrap_text ()
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def generate_help (options, header=None):
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"""Generate help text (a list of strings, one per suggested line of
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output) from an option table."""
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# Blithely assume the option table is good: probably wouldn't call
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# 'generate_help()' unless you've already called 'fancy_getopt()'.
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# First pass: determine maximum length of long option names
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max_opt = 0
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for option in options:
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long = option[0]
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short = option[1]
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l = len (long)
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if long[-1] == '=':
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l = l - 1
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if short is not None:
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l = l + 5 # " (-x)" where short == 'x'
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if l > max_opt:
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max_opt = l
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opt_width = max_opt + 2 + 2 + 2 # room for indent + dashes + gutter
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# Typical help block looks like this:
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# --foo controls foonabulation
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# Help block for longest option looks like this:
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# --flimflam set the flim-flam level
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# and with wrapped text:
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# --flimflam set the flim-flam level (must be between
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# 0 and 100, except on Tuesdays)
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# Options with short names will have the short name shown (but
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# it doesn't contribute to max_opt):
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# --foo (-f) controls foonabulation
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# If adding the short option would make the left column too wide,
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# we push the explanation off to the next line
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# --flimflam (-l)
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# set the flim-flam level
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# Important parameters:
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# - 2 spaces before option block start lines
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# - 2 dashes for each long option name
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# - min. 2 spaces between option and explanation (gutter)
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# - 5 characters (incl. space) for short option name
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# Now generate lines of help text.
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line_width = 78 # if 80 columns were good enough for
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text_width = line_width - opt_width # Jesus, then 78 are good enough for me
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big_indent = ' ' * opt_width
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if header:
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lines = [header]
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else:
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lines = ['Option summary:']
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for (long,short,help) in options:
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text = wrap_text (help, text_width)
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if long[-1] == '=':
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long = long[0:-1]
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# Case 1: no short option at all (makes life easy)
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if short is None:
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if text:
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lines.append (" --%-*s %s" % (max_opt, long, text[0]))
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else:
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lines.append (" --%-*s " % (max_opt, long))
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for l in text[1:]:
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lines.append (big_indent + l)
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# Case 2: we have a short option, so we have to include it
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# just after the long option
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else:
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opt_names = "%s (-%s)" % (long, short)
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if text:
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lines.append (" --%-*s %s" %
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(max_opt, opt_names, text[0]))
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else:
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lines.append (" --%-*s" % opt_names)
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# for loop over options
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return lines
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# generate_help ()
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def print_help (options, file=None, header=None):
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if file is None:
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file = sys.stdout
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for line in generate_help (options, header):
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file.write (line + "\n")
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# print_help ()
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if __name__ == "__main__":
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text = """\
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Tra-la-la, supercalifragilisticexpialidocious.
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How *do* you spell that odd word, anyways?
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(Someone ask Mary -- she'll know [or she'll
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say, "How should I know?"].)"""
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for w in (10, 20, 30, 40):
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print "width: %d" % w
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print string.join (wrap_text (text, w), "\n")
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print
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