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# Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
#
# This file is part of attoconf.
#
# attoconf is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# attoconf is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with attoconf. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function, division, absolute_import
from collections import namedtuple
import os
import sys
from .help import Help
# Nothing to see here. Move along.
Option = namedtuple('Option', ['type', 'init'])
class ArgumentError(Exception): pass
def as_var(name):
return name.lstrip('-').replace('-', '_').upper()
def trim_trailing_slashes(path):
p, s = os.path.split(path)
if not s:
return p
return path
class Project(object):
''' A Project is a directory and the list of options that can be set.
'''
__slots__ = (
'srcdir',
'aliases',
'options',
'help',
'checks',
)
def __init__(self, srcdir):
''' A Project is initially constructed from just the source directory
'''
self.srcdir = trim_trailing_slashes(srcdir)
self.aliases = {}
self.options = {}
self.help = Help()
self.checks = []
def add_help(self, text, hidden):
''' Directly add a line of text to the help.
'''
self.help.add_text(text, hidden)
def add_alias(self, key, expansion, help, hidden):
''' Add an alias.
This is necessary for anything to appear without an =.
The expansion is a list of other options, which may be aliases.
'''
if key in self.aliases:
raise KeyError(key)
expansion = list(expansion)
self.aliases[key] = expansion
if help is None:
help = 'alias for ' + ' '.join(expansion)
self.help.add_option(key, help, hidden)
def add_option(self, name, init, type, check,
help, hidden,
help_var=None, help_def=None):
''' Add an actual option.
This must be passed with a =.
In the builder, the var will first be set to init.
If the argument is passed, the type hook is called immediately
to validate the argument.
The check hooks will be called at final time,
in the order they were added.
Additionally, a line of help is added, with additional formatting.
'''
if name in self.options:
raise KeyError(name)
self.options[name] = Option(init=init, type=type)
if check is not None:
self.checks.append(
lambda bld: check(bld, bld.vars[as_var(name)][0]) )
if help_var is None:
help_var = as_var(name)
if help_def is None:
help_def = init
if help_def is not None:
help = '%s [%s]' % (help, help_def)
if help_var != name:
help_opt = '%s=%s' % (name, help_var)
else:
help_opt = name
self.help.add_option(help_opt, help, hidden)
def do_help(self, opt):
''' Pseudo type-hook to be registered for --help (calls sys.exit).
'''
if opt == 'default':
hidden = False
elif opt == 'hidden':
hidden = True
else:
raise ValueError
self.help.print(sys.stdout, hidden)
sys.exit()
class Build(object):
''' A Build is a directory and set of options applied to a Project.
'''
__slots__ = (
'builddir',
'project',
'vars',
)
def __init__(self, project, builddir):
''' A Build is initially constructed from a project and a build dir.
'''
self.project = project
self.builddir = trim_trailing_slashes(builddir)
self.vars = {as_var(k): (o.init, 'default')
for k, o in project.options.iteritems()}
def apply_arg(self, arg):
''' Parse a single argument, expanding aliases.
'''
alias = self.project.aliases.get(arg)
if alias is not None:
for e in alias:
# TODO: catch recursive aliases
# or should they be caught earlier?
self.apply_arg(e)
return
if '=' not in arg:
if arg in self.project.options:
raise ArgumentError('Option %s requires an argument' % arg)
elif arg.startswith('-'):
raise ArgumentError('Unknown option %s' % arg)
else:
raise ArgumentError('Unknown environment variable %s' % arg)
k, a = arg.split('=', 1)
opt = self.project.options.get(k)
if opt is None:
raise sys.exit('Unknown option %s' % k)
self.vars[as_var(k)] = (opt.type(a), 'command-line')
def finish(self):
''' With the current set of variables, run all the checks
and presumably produce some sort of output.
'''
for check in self.project.checks:
check(self)
def configure(self, args, env):
''' First apply variables from the environment,
then call apply_arg() a bunch of times, then finish().
'''
for k in self.project.options:
if k != as_var(k):
continue
val = env.get(k)
if val is not None:
self.vars[k] = (self.project.options[k].type(val), 'environment')
for arg in args:
self.apply_arg(arg)
self.finish()
def relative_source(self):
''' Return a relative path from the build tree to the source tree.
'''
srcdir = self.project.srcdir
builddir = self.builddir
if os.path.isabs(srcdir):
return srcdir
if os.path.isabs(builddir):
return os.path.realpath(srcdir)
return os.path.relpath(os.path.realpath(srcdir),
os.path.realpath(builddir))
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