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

VERSION='0.0.1'
APPNAME='cc_test'

top = '.'
out = 'build'

"""
General variant system

Call for example:
$ waf configure build_debug build_release clean_debug clean_release

The builds will end in different build folders
note how "bld.variant" is used to detect the current variant

See also playground/remote/wscript for a more specific example
"""

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 read the comments in 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())

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

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

	## 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'
	# you may also set 'win32/debug' instead of 'debug'
	# the commands will be "build_win32/debug" or "build_win32/release"
	# in this case you may want to modify Options.commands in this "init" function

# calling "waf buildall" will run "waf build_debug build_release"
def buildall(ctx):
	import waflib.Options
	for x in ('build_debug', 'build_release'):
		waflib.Options.commands.insert(0, x)

# --------------------------
# or, if you want to memorize the default variant and just type "waf",
#
#def options(opt):
#	opt.load('compiler_c')
#def init(ctx):
#	from waflib import ConfigSet, Options
#	env = ConfigSet.ConfigSet()
#	try:
#		env.load('build/c4che/foo.txt')
#	except:
#		the_variant = 'debug'
#	else:
#		the_variant = env.the_variant or debug
#
#	if getattr(Options.options, 'the_variant', ''):
#		if Options.options.the_variant != the_variant:
#			the_variant = env.the_variant = Options.options.the_variant
#			env.store('build/c4che/foo.txt')
#
#	for y in (BuildContext, CleanContext, InstallContext, UninstallContext):
#		class tmp(y):
#			variant = the_variant
# --------------------------
# Or, if you like to have a command-line flag
#   - add ctx.load('variant') to options and init functions
#   - add --variant=<name of the variant> to the command line
#def options(ctx):
#    ctx.add_option('--variant', action='store', default='', help='set the variant name')
#def init(ctx):
#    from waflib.Options import options
#    from waflib.Build import BuildContext, CleanContext, InstallContext, UninstallContext
#    from waflib.Configure import ConfigurationContext
#    for y in (BuildContext, CleanContext, InstallContext, UninstallContext, ConfigurationContext):
#        name = y.__name__.replace('Context','').lower()
#        class tmp(y):
#            cmd = name
#            variant = options.variant
#