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import re, argparse, sys, os
from collections import OrderedDict, namedtuple
import curses.ascii
def indentify(s, indent=' '):
return s.replace('\n', '\n' + indent)
def argv_to_shell(argv):
quoteds = []
for arg in argv:
if re.match('^[a-zA-Z0-9_\.@/+-]+$', arg):
quoteds.append(arg)
else:
quoted = ''
for c in arg:
if c == '\n':
quoted += r'\n'
elif c in r'$`\"':
quoted += '\\' + c
elif not curses.ascii.isprint(c):
quoted += r'\x%02x' % ord(c)
else:
quoted += c
quoteds.append('"' + quoted + '"')
return ' '.join(quoteds)
class PendingOption(namedtuple('PendingOption', 'opt')):
def need(self):
self.opt.show = True
def __str__(self):
return 'PendingOption(%s)' % (self.opt.name,)
class SettingsGroup(object):
def __init__(self, parent=None):
object.__setattr__(self, 'parent', parent)
object.__setattr__(self, 'vals', OrderedDict())
@staticmethod
def get_meat(self, attr, exctype):
try:
obj = object.__getattribute__(self, 'vals')[attr]
except KeyError:
if self.parent is not None:
return SettingsGroup.get_meat(object.__getattribute__(self, 'parent'), attr, exctype)
raise exctype(attr)
else:
if isinstance(obj, PendingOption):
raise Exception("setting %s is pending a command line option, probably because you didn't 'need' it")
return obj
def __getattribute__(self, attr):
try:
return object.__getattribute__(self, attr)
except AttributeError:
return SettingsGroup.get_meat(self, attr, AttributeError)
def __setattr__(self, attr, val):
try:
object.__getattribute__(self, attr)
except:
self[attr] = val
else:
object.__setattribute__(self, attr, val)
def __getitem__(self, attr):
return self.__getattribute__(attr)
def __setitem__(self, attr, val):
self.vals[attr] = val
def __iter__(self):
return self.vals.__iter__()
def items(self):
return self.vals.items()
def __str__(self):
s = 'SettingsGroup {\n'
for attr, val in self.vals.items():
s += ' %s: %s\n' % (attr, indentify(str(val)))
s += '}'
return s
def relative_lookup(name):
if name.startswith('..'):
return self.parent.relative_lookup(name)
else:
bits = name.split('.', 1)
if len(bits) == 1:
return (self, bits[0])
else:
return self[bits[0]].relative_lookup(bits[1])
def need(self, name):
if name not in self.vals:
raise KeyError('need setting that has not been set')
obj = self.vals[name]
if hasattr(obj, 'need'):
obj.need()
def add_setting_option(self, name, optname, optdesc, default, **kwargs):
def f(value):
self[name] = value
opt = Option(optname, optdesc, default, f, **kwargs)
self[name] = PendingOption(opt)
class OptSection(object):
def __init__(self, desc):
self.desc = desc
self.opts = []
all_opt_sections.append(self)
def move_to_end(self):
all_opt_sections.remove(self)
all_opt_sections.append(self)
class Option(object):
def __init__(self, name, help, default, on_set, bool=False, show=False, section=None, **kwargs):
self.name = name
self.help = help
self.default = Expansion(default) if isinstance(default, str) else default
self.on_set = on_set
self.show = show
self.bool = bool
self.section = section if section is not None else default_opt_section
self.section.opts.append(self)
assert set(kwargs).issubset({'nargs', 'type', 'choices', 'required', 'metavar'})
self.argparse_kw = kwargs.copy()
all_options.append(self)
if name in all_options_by_name:
raise KeyError('trying to create Option with duplicate name %r; old is:\n%r' % (name, all_options_by_name[name]))
all_options_by_name[name] = self
def __repr__(self):
return 'Option(name=%r, help=%r, value=%r, default=%r)' % (self.name, self.help, self.value, self.default)
def set(self, value):
self.value = value
if self.on_set is not None:
self.on_set(value)
class Expansion(object):
def __init__(self, fmt):
self.fmt = fmt
self.deps = re.findall('\((.*?)\)', fmt)
def __repr__(self):
return 'Expansion(%r)' % (self.fmt,)
class InstallationDirsGroup(SettingsGroup):
def __init__(self):
section = OptSection('Fine tuning of the installation directories:')
SettingsGroup.__init__(self)
for name, optname, optdesc, default in [
('prefix', 'prefix', '', '/usr/local'),
('exec_prefix', 'exec-prefix', '', '(prefix)'),
('bin', 'bindir', '', '(exec_prefix)/bin'),
('sbin', 'sbindir', '', '(exec_prefix)/sbin'),
('libexec', 'libexecdir', '', '(exec_prefix)/libexec'),
('etc', 'sysconfdir', '', '(prefix)/etc'),
('var', 'localstatedir', '', '(prefix)/var'),
('lib', 'libdir', '', '(prefix)/lib'),
('include', 'includedir', '', '(prefix)/include'),
('datarootdir', 'datarootdir', '', '(prefix)/share'),
('share', 'datadir', '', '(datarootdir)'),
('locale', 'localedir', '', '(datarootdir)/locale'),
('man', 'mandir', '', '(datarootdir)/man'),
('doc', 'docdir', '', '(datarootdir)/doc/(..package_unix_name)'),
('html', 'htmldir', '', '(doc)'),
('pdf', 'pdfdir', '', '(doc)'),
]:
self.add_setting_option(name, optname, optdesc, default, section=section)
for ignored in ['sharedstatedir', 'oldincludedir', 'infodir', 'dvidir', 'psdir']:
Option(ignored, 'Ignored autotools compatibility setting', '', None, section=section)
def _make_argparse(include_all):
parser = argparse.ArgumentParser(add_help=False, usage='configure [OPTION]... [VAR=VALUE]...')
parser.add_argument('--help', action='store_true', help='Show this help', dest='__help')
parser.add_argument('--help-all', action='help', help='Show this help, including unused options')
for sect in all_opt_sections:
if not include_all and not any(opt.show for opt in sect.opts):
continue
ag = parser.add_argument_group(description=sect.desc)
for opt in sect.opts:
if not include_all and not opt.show: continue
ag.add_argument('--' + opt.name,
action='store_true' if opt.bool else 'store',
dest=opt.name,
help=opt.help,
**opt.argparse_kw)
return parser
def parse_args():
default_opt_section.move_to_end()
parser = _make_argparse(include_all=True)
args, argv = parser.parse_known_args()
if args.__help:
parser = _make_argparse(include_all=False)
parser.print_help()
sys.exit(0)
def do_env_arg(arg):
m = re.match('([^ ]+)=(.*)', arg)
if m:
os.environ[m.group(1)] = m.group(2)
return False
return True
argv = list(filter(do_env_arg, argv))
if argv:
parser = _make_argparse(include_all=False)
parser.error('unrecognized arguments: %s' % (argv_to_shell(argv),))
for opt in all_options:
opt.set(getattr(args, opt.name))
all_options = []
all_options_by_name = {}
all_opt_sections = []
default_opt_section = OptSection('Uncategorized options:')
settings_root = SettingsGroup()
settings_root.idirs = InstallationDirsGroup()
# --
settings_root.package_unix_name = 'substitute'
settings_root.idirs.need('pdf')
parse_args()
print settings_root
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