+# Copyright 2010-2012 Avery Pennarun and options.py contributors.
+# All rights reserved.
+#
+# (This license applies to this file but not necessarily the other files in
+# this package.)
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in
+# the documentation and/or other materials provided with the
+# distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY AVERY PENNARUN ``AS IS'' AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
"""Command-line options parser.
With the help of an options spec string, easily parse command-line options.
Long option flags are used as the option's key for the OptDict produced when
parsing options.
-When the flag definition is ended with an equal sign, the option takes one
-string as an argument. Otherwise, the option does not take an argument and
-corresponds to a boolean flag that is true when the option is given on the
-command line.
+When the flag definition is ended with an equal sign, the option takes
+one string as an argument, and that string will be converted to an
+integer when possible. Otherwise, the option does not take an argument
+and corresponds to a boolean flag that is true when the option is
+given on the command line.
The option's description is found at the right of its flags definition, after
one or more spaces. The description ends at the end of the line. If the
"""
import sys, os, textwrap, getopt, re, struct
-class OptDict:
+
+def _invert(v, invert):
+ if invert:
+ return not v
+ return v
+
+
+def _remove_negative_kv(k, v):
+ if k.startswith('no-') or k.startswith('no_'):
+ return k[3:], not v
+ return k,v
+
+
+class OptDict(object):
"""Dictionary that exposes keys as attributes.
- Keys can bet set or accessed with a "no-" or "no_" prefix to negate the
+ Keys can be set or accessed with a "no-" or "no_" prefix to negate the
value.
"""
- def __init__(self):
+ def __init__(self, aliases):
self._opts = {}
+ self._aliases = aliases
+
+ def _unalias(self, k):
+ k, reinvert = _remove_negative_kv(k, False)
+ k, invert = self._aliases[k]
+ return k, invert ^ reinvert
def __setitem__(self, k, v):
- if k.startswith('no-') or k.startswith('no_'):
- k = k[3:]
- v = not v
- self._opts[k] = v
+ k, invert = self._unalias(k)
+ self._opts[k] = _invert(v, invert)
def __getitem__(self, k):
- if k.startswith('no-') or k.startswith('no_'):
- return not self._opts[k[3:]]
- return self._opts[k]
+ k, invert = self._unalias(k)
+ return _invert(self._opts[k], invert)
def __getattr__(self, k):
return self[k]
return 0
-def _remove_negative_kv(k, v):
- if k.startswith('no-') or k.startswith('no_'):
- return k[3:], not v
- return k,v
-
-def _remove_negative_k(k):
- return _remove_negative_kv(k, None)[0]
-
-
def _tty_width():
s = struct.pack("HHHH", 0, 0, 0, 0)
try:
self._longopts = ['help', 'usage']
self._hasparms = {}
self._defaults = {}
- self._usagestr = self._gen_usage()
+ self._usagestr = self._gen_usage() # this also parses the optspec
def _gen_usage(self):
out = []
l.lstrip()))
last_was_option = False
elif l:
- (flags, extra) = l.split(' ', 1)
+ (flags,extra) = (l + ' ').split(' ', 1)
extra = extra.strip()
if flags.endswith('='):
flags = flags[:-1]
has_parm = 0
g = re.search(r'\[([^\]]*)\]$', extra)
if g:
- defval = g.group(1)
+ defval = _intify(g.group(1))
else:
defval = None
flagl = flags.split(',')
flagl_nice = []
+ flag_main, invert_main = _remove_negative_kv(flagl[0], False)
+ self._defaults[flag_main] = _invert(defval, invert_main)
for _f in flagl:
- f,dvi = _remove_negative_kv(_f, _intify(defval))
- self._aliases[f] = _remove_negative_k(flagl[0])
+ f,invert = _remove_negative_kv(_f, 0)
+ self._aliases[f] = (flag_main, invert_main ^ invert)
self._hasparms[f] = has_parm
- self._defaults[f] = dvi
if f == '#':
self._shortopts += '0123456789'
flagl_nice.append('-#')
flagl_nice.append('-' + f)
else:
f_nice = re.sub(r'\W', '_', f)
- self._aliases[f_nice] = _remove_negative_k(flagl[0])
+ self._aliases[f_nice] = (flag_main,
+ invert_main ^ invert)
self._longopts.append(f + (has_parm and '=' or ''))
self._longopts.append('no-' + f)
flagl_nice.append('--' + _f)
"""Print usage string to stderr and abort."""
sys.stderr.write(self._usagestr)
if msg:
- sys.stderr.write(msg)
+ sys.stderr.write("\n" + msg)
e = self._onabort and self._onabort(msg) or None
if e:
raise e
def fatal(self, msg):
"""Print an error message to stderr and abort with usage string."""
- msg = '\nerror: %s\n' % msg
+ msg = 'Error: %s!' % msg
return self.usage(msg)
def parse(self, args):
except getopt.GetoptError, e:
self.fatal(e)
- opt = OptDict()
+ opt = OptDict(aliases=self._aliases)
for k,v in self._defaults.iteritems():
- k = self._aliases[k]
opt[k] = v
for (k,v) in flags:
k = k.lstrip('-')
if k in ('h', '?', 'help', 'usage'):
self.usage()
- if k.startswith('no-'):
- k = self._aliases[k[3:]]
- v = 0
- elif (self._aliases.get('#') and
+ if (self._aliases.get('#') and
k in ('0','1','2','3','4','5','6','7','8','9')):
v = int(k) # guaranteed to be exactly one digit
- k = self._aliases['#']
+ k, invert = self._aliases['#']
opt['#'] = v
else:
- k = self._aliases[k]
+ k, invert = opt._unalias(k)
if not self._hasparms[k]:
assert(v == '')
v = (opt._opts.get(k) or 0) + 1
else:
v = _intify(v)
- opt[k] = v
- for (f1,f2) in self._aliases.iteritems():
- opt[f1] = opt._opts.get(f2)
+ opt[k] = _invert(v, invert)
return (opt,flags,extra)
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