#! /usr/bin/env python

"""
A build iterator similar to "waf step" but following the dependencies of input/output files

waf make --files=aa
waf clean make --files=cc
"""

top = '.'
out = 'build'

def options(opt):
	opt.load('make')

def configure(conf):
	conf.load('make')

def build(bld):

	x = bld.path.make_node('wscript')

	def xxx(**kw):
		# this is just an alias, but aliases are convenient, use them!
		kw['update_outputs'] = True
		if not 'rule' in kw:
			kw['rule'] = 'cp ${SRC} ${TGT}'
		return bld(**kw)

	xxx(source=x, target=x.change_ext('.a'), name='a')
	xxx(source=x.change_ext('.a'), target=x.change_ext('.aa'), name='aa')

	xxx(source=x, target=x.change_ext('.b'), name='b')
	xxx(source=x.change_ext('.b'), target=x.change_ext('.bb'), name='bb')

	xxx(source=x, target=x.change_ext('.c'), name='c')

	xxx(rule='cat ${SRC} > ${TGT}', source=[x.change_ext('.bb'), x.change_ext('.aa')], target=[x.change_ext('.cc')], name='cc')