LOL, this is what Craftr could've been. Luckily it's not. https://github.com/craftr-build/craftr

old-beak-build.py

# Copyright (c) 2014, Niklas Rosenstein
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

from beak.targets import IOTarget, FileTarget

pl = load('beak/platform.py').current
c4d_api = load('c4d-api/build.py')

plugin_name = basename(env.dirname)

def on_setup(session):
    c4d = session.get_data(c4d_api)

    data = Attributor()
    data.sources = localglob('src/*.cpp', 'src/*/*.cpp', 'src/*/*/*.cpp')
    data.compiler = c4d.compiler.copy()
    data.compiler.add_include(*map(localpath, ('include', 'res')))
    data.linker = c4d.linker.copy()
    data.linker.link_with(c4d.libname)

    data.builddir = localpath(joinpath('build', c4d.mode, c4d.arch))
    data.objdir = joinpath(data.builddir, 'obj')

    data.libname = localpath(c4d.gen_libname(plugin_name))
    return data

@env.register_target
class Objects(IOTarget):

    def get_inputs(self, data):
        return data.sources

    def get_output(self, data, fin):
        return pl.objname(chdir(fin, data.objdir))

    def build_file(self, data, fin, fout):
        data.compiler.compile(fout, [fin])

@env.register_target
class Library(FileTarget):

    dependencies = [Objects, c4d_api.Library]

    def get_inputs(self, data):
        return self.dependencies[0].outputs

    def get_output(self, data):
        return data.libname

    def build_file(self, data, inputs, libname):
        data.linker.compile(libname, inputs)