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

VERSION='0.0.1'
APPNAME='cc_test'

top = '.'
out = 'build'

"""
Variant system for waf 1.6

call for example
$ waf configure build_debug build_release clean_debug clean_release
"""

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

def configure(conf):

	conf.setenv('debug')
	conf.load('compiler_c')
	conf.define("A", 1)
	conf.define("B", 1.1)
	conf.define("C", "1.1e19", quote=False)
	# the configuration file must be written in each variant
	conf.write_config_header('debug/config.h', remove=False)

	conf.setenv('release', env=conf.env.derive()) # start with a copy instead of a new env
	conf.env.CFLAGS = ['-O2']
	conf.options.prefix = '/opt' # warning: this changes the options globally
	conf.load('compiler_c')
	conf.define('E', 1)
	conf.write_config_header('release/config.h')

def build(bld):

	# cleaning from the top-level directory might remove
	# the file 'config.h' from the variants, so we
	# are forcing the use of *debug or *release commands
	#
	# the config set 'debug' is loaded automatically when the 'debug' variant is used
	if not bld.variant:
		bld.fatal('Call "waf build_debug" or "waf build_release", and look in the comments of the wscript file!')

	# the includes='.' add the build directory path to the command arguments
	# (look at the -I flags by using waf -v)
	bld.program(source='main.c', target='app', includes='.')

	# To use multiple compilers at once, either:
	#
	# * use a particular environment from the configuration:
	#     bld.env = bld.all_envs['debug']
	#     bld.program(source='main.c', target='app2', includes='.')
	# * add an 'env' parameter to a particular task generator:
	#     bld.program(...,  env=bld.all_envs['release'].derive())

# ------ new declaration for variants -------
#
# calling 'waf clean_debug debug' will build into another output directory
# note how "bld.variant" is used to detect the current variant
#

def init(ctx):
	from waflib.Build import BuildContext, CleanContext, InstallContext, UninstallContext

	for x in 'debug release'.split():
		for y in (BuildContext, CleanContext, InstallContext, UninstallContext):
			name = y.__name__.replace('Context','').lower()
			class tmp(y):
				cmd = name + '_' + x
				variant = x

	def buildall(ctx):
		import waflib.Options
		for x in ['build_debug', 'build_release']:
			waflib.Options.commands.insert(0, x)

	## if you work on "debug" 99% of the time, here is how to re-enable "waf build":
	#for y in (BuildContext, CleanContext, InstallContext, UninstallContext):
	#	class tmp(y):
	#		variant = 'debug'