#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2010 (ita)

VERSION='0.0.1'
APPNAME='cc_test'

"""
The build groups can be processed all at once (required for the progress bar)
or sequentially in a lazy manner.

Each time one more .c file will be added during the build and compiled and linked in app

$ waf distclean configure build build
'distclean' finished successfully (0.005s)
Setting top to                           : /dynamic_build
Setting out to                           : /dynamic_build/build
Checking for 'gcc' (c compiler)          : ok
'configure' finished successfully (0.091s)

Waf: Entering directory `/dynamic_build/build'
[1/1] foo_3.c:  -> build/foo_3.c
[2/4] c: main.c -> build/main.c.1.o
[3/4] c: build/foo_3.c -> build/foo_3.c.1.o
[4/4] cprogram: build/main.c.1.o build/foo_3.c.1.o -> build/app
Waf: Leaving directory `/dynamic_build/build'
'build' finished successfully (5.169s)

Waf: Entering directory `/dynamic_build/build'
[1/1] foo_17.c:  -> build/foo_17.c
[3/5] c: build/foo_17.c -> build/foo_17.c.1.o
[5/5] cprogram: build/main.c.1.o build/foo_17.c.1.o build/foo_3.c.1.o -> build/app
Waf: Leaving directory `/dynamic_build/build'
'build' finished successfully (5.144s)
"""

top = '.'

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

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


def build(bld):
	"""
	groups will be processed one by one during the build
	the progress bar display will be inaccurate
	"""

	bld.post_mode = Build.POST_LAZY

	import random
	rnd = random.randint(0, 25)
	bld(
		rule           = "sleep 2 && (echo 'int num%d = %d;' > ${TGT})" % (rnd, rnd),
		target         = 'foo_%d.c' % rnd,
       )

	bld.add_group()

	bld.program(source='main.c', target='app', dynamic_source='*.c')

# support for the "dynamic_source" attribute follows

from waflib import Build, Utils, TaskGen
@TaskGen.feature('c')
@TaskGen.before('process_source', 'process_rule')
def dynamic_post(self):
	"""
	bld(dynamic_source='*.c', ..) will search for source files to add to the attribute 'source'
	we could also call "eval" or whatever expression
	"""
	if not getattr(self, 'dynamic_source', None):
		return
	self.source = Utils.to_list(self.source)
	self.source.extend(self.path.get_bld().ant_glob(self.dynamic_source, remove=False))