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import pprint
from waflib.Configure import conf
import deps_parser

pp = pprint.PrettyPrinter().pprint

def test_build(ctx):
    ctx(rule='echo hello', shell=True, always=True)

@conf
def parse_dependencies(ctx, checks):
    def valid_symbol(check_name):
        return not check_name.startswith('os-')

    def multicheck_dict(check):
        # our checks take ctx, dependency_id, we need to curry the
        # dependency_id in and just accept ctx as argument
        def curry_id(fn):
            def curried(ctx):
                return fn(ctx, check['name'])
            return curried

        result = {
            'id': check['name'],
            'msg': 'Checking for ' + check['desc'],
            'func': curry_id(check['func']),
        }

        if ('deps' in check):
            after_tests = deps_parser.symbols_list(check['deps'])
            result['after_tests'] = filter(valid_symbol, after_tests)

        return result

    known_deps = set()
    satisfied_deps = set()

    rules = map(multicheck_dict, checks)
    ctx.multicheck(*rules)

    ctx.env.known_deps = list(known_deps)
    ctx.env.satisfied_deps = list(satisfied_deps)

@conf
def dependency_satisfied(ctx, dependency_identifier):
    return False

# from waflib.Errors import ConfigurationError, WafError
# from waflib.Configure import conf
# from waflib.Build import BuildContext
# from waflib.Logs import pprint
# import inflector
# 
# class DependencyError(Exception):
#     pass
# 
# class Dependency(object):
#     def __init__(self, ctx, known_deps, satisfied_deps, dependency):
#         self.ctx = ctx
#         self.known_deps = known_deps
#         self.satisfied_deps = satisfied_deps
#         self.identifier, self.desc = dependency['name'], dependency['desc']
#         self.attributes = self.__parse_attributes__(dependency)
# 
#         known_deps.add(self.identifier)
# 
#         if 'deps' in self.attributes:
#             self.ctx.ensure_dependency_is_known(self.attributes['deps'])
# 
#     def __parse_attributes__(self, dependency):
#         if 'os_specific_checks' in dependency:
#             all_chks = dependency['os_specific_checks']
#             chks = [check for check in all_chks if check in self.satisfied_deps]
#             if any(chks):
#                 return all_chks[chks[0]]
#         return dependency
# 
#     def check(self):
#         self.ctx.start_msg('Checking for {0}'.format(self.desc))
# 
#         try:
#             self.check_group_disabled()
#             self.check_disabled()
#             self.check_dependencies()
#         except DependencyError:
#             # No check was run, since the prerequisites of the dependency are
#             # not satisfied. Make sure the define is 'undefined' so that we
#             # get a `#define YYY 0` in `config.h`.
#             self.ctx.undefine(inflector.define_key(self.identifier))
#             self.fatal_if_needed()
#             return
# 
#         self.check_autodetect_func()
# 
#     def check_group_disabled(self):
#         if 'groups' in self.attributes:
#             groups = self.attributes['groups']
#             disabled = (self.enabled_option(g) == False for g in groups)
#             if any(disabled):
#                 self.skip()
#                 raise DependencyError
# 
#     def check_disabled(self):
#         if self.enabled_option() == False:
#             self.skip()
#             raise DependencyError
# 
#         if self.enabled_option() == True:
#             self.attributes['req'] = True
#             self.attributes['fmsg'] = "You manually enabled the feature '{0}', but \
# the autodetection check failed.".format(self.identifier)
# 
#     def check_dependencies(self):
#         if 'deps' in self.attributes:
#             ok, why = deps_parser.check_dependency_expr(self.attributes['deps'],
#                                                         self.satisfied_deps)
#             if not ok:
#                 self.skip(why)
#                 raise DependencyError
# 
#     def check_autodetect_func(self):
#         if self.attributes['func'](self.ctx, self.identifier):
#             self.success(self.identifier)
#         else:
#             self.fail()
#             self.ctx.undefine(inflector.define_key(self.identifier))
#             self.fatal_if_needed()
# 
#     def enabled_option(self, identifier=None):
#         try:
#             return getattr(self.ctx.options, self.enabled_option_repr(identifier))
#         except AttributeError:
#             pass
#         return None
# 
#     def enabled_option_repr(self, identifier):
#         return "enable_{0}".format(identifier or self.identifier)
# 
#     def success(self, depname):
#         self.ctx.mark_satisfied(depname)
#         self.ctx.end_msg(self.__message__('yes'))
# 
#     def fail(self, reason='no'):
#         self.ctx.end_msg(self.__message__(reason), 'RED')
# 
#     def fatal_if_needed(self):
#         if self.enabled_option() == False:
#             return
#         if self.attributes.get('req', False):
#             raise ConfigurationError(self.attributes.get('fmsg', 'Unsatisfied requirement'))
# 
#     def skip(self, reason='disabled', color='YELLOW'):
#         self.ctx.end_msg(self.__message__(reason), color)
# 
#     def __message__(self, message):
#         optional_message = self.ctx.deps_msg.get(self.identifier)
#         if optional_message:
#             return "{0} ({1})".format(message, optional_message)
#         else:
#             return message
# 
# def configure(ctx):
#     def __detect_target_os_dependency__(ctx):
#         target = "os-{0}".format(ctx.env.DEST_OS)
#         ctx.start_msg('Detected target OS:')
#         ctx.end_msg(target)
#         ctx.known_deps.add(target)
#         ctx.satisfied_deps.add(target)
# 
#     ctx.deps_msg = {}
#     ctx.known_deps = set()
#     ctx.satisfied_deps = set()
#     __detect_target_os_dependency__(ctx)
# 
# @conf
# def ensure_dependency_is_known(ctx, depnames):
#     def check(ast):
#         if isinstance(ast, deps_parser.AstSym):
#             if (not ast.name.startswith('os-')) and ast.name not in ctx.known_deps:
#                 raise ConfigurationError(
#                     "error in dependencies definition: dependency {0} in"
#                     " {1} is unknown.".format(ast.name, depnames))
#         elif isinstance(ast, deps_parser.AstOp):
#             for sub in ast.sub:
#                 check(sub)
#         else:
#             assert False
#     check(deps_parser.parse_expr(depnames))
# 
# @conf
# def mark_satisfied(ctx, dependency_identifier):
#     ctx.satisfied_deps.add(dependency_identifier)
# 
# @conf
# def add_optional_message(ctx, dependency_identifier, message):
#     ctx.deps_msg[dependency_identifier] = message
# 
# @conf
# def dependency_satisfied(ctx, dependency_identifier):
#     ctx.ensure_dependency_is_known(dependency_identifier)
#     ok, _ = deps_parser.check_dependency_expr(dependency_identifier,
#                                               ctx.satisfied_deps)
#     return ok
# 
# @conf
# def store_dependencies_lists(ctx):
#     ctx.env.known_deps     = list(ctx.known_deps)
#     ctx.env.satisfied_deps = list(ctx.satisfied_deps)
# 
# @conf
# def unpack_dependencies_lists(ctx):
#     ctx.known_deps     = set(ctx.env.known_deps)
#     ctx.satisfied_deps = set(ctx.env.satisfied_deps)
# 
# def filtered_sources(ctx, sources):
#     def __source_file__(source):
#         if isinstance(source, tuple):
#             return source[0]
#         else:
#             return source
# 
#     def __check_filter__(dependency):
#         return dependency_satisfied(ctx, dependency)
# 
#     def __unpack_and_check_filter__(source):
#         try:
#             _, dependency = source
#             return __check_filter__(dependency)
#         except ValueError:
#             return True
# 
#     return [__source_file__(source) for source in sources \
#             if __unpack_and_check_filter__(source)]
# 
# """
# Like filtered_sources(), but pick only the first entry that matches, and
# return its filename.
# """
# def pick_first_matching_dep(ctx, deps):
#     files = filtered_sources(ctx, deps)
#     if len(files) > 0:
#         return files[0]
#     else:
#         raise DependencyError
# 
# def env_fetch(tx):
#     def fn(ctx):
#         deps = ctx.env.satisfied_deps
#         lists = [ctx.env[tx(dep)] for dep in deps if (tx(dep) in ctx.env)]
#         return [item for sublist in lists for item in sublist]
#     return fn
# 
# def dependencies_use(ctx):
#     return [inflector.storage_key(dep) for dep in ctx.env.satisfied_deps]
# 
# BuildContext.filtered_sources = filtered_sources
# BuildContext.pick_first_matching_dep = pick_first_matching_dep
# BuildContext.dependencies_use = dependencies_use
# BuildContext.dependencies_includes  = env_fetch(lambda x: "INCLUDES_{0}".format(x))
# BuildContext.dependency_satisfied = dependency_satisfied