#!/usr/bin/env python
# encoding: utf-8
# grt - Go Ray Tracer
# By: Tom Wambold <tom5760@gmail.com>
# wscript - Waf build script

top = '.'
out = 'build'

def set_options(opt):
	opt.add_option('--exe', action='store_true', default=False, help='Execute the program after it is compiled', dest='exe')

def configure(ctx):
	ctx.check_tool('go')

	try:
		ctx.check_tool('gcc')
		ctx.check_cc(fragment='#include <gmp.h>\nint main() {return 0;}\n', uselib_store='GMP', lib='gmp')
	except ctx.errors.ConfigurationError:
		ctx.env.TRY_CGO = False
	else:
		ctx.env.TRY_CGO = True

def build(ctx):
	ctx(
		features = 'go gopackage',
		target   = 'other',
		source   = [
			'other/a.go',
			'other/b.go',
		],
	)

	ctx(
		features = 'go goprogram',
		target   = 'test',
		uselib_local = 'other',
		source   = 'main.go',
	)

	if ctx.env.TRY_CGO:
		# see http://code.google.com/p/go/issues/detail?id=533
		# so we have to move the files, grrrrr
		ctx(name='cgo', rule='${CGO} ${SRC[0].abspath(env)} && mv ../../gmp.cgo1.go ../../gmp.cgo2.c ${TGT[0].parent.abspath(env)}',
			target='gmp.cgo1.go gmp.cgo2.c   gmp.cgo2.c _cgo_gotypes.go _cgo_defun.c',
			source='gmp.go',
			cwd = ctx.path.abspath(ctx.env),
			shell=True)
		ctx.add_group()
		ctx(features='cc cshlib', source='gmp.cgo2.c', target='cgo_gmp.so', uselib='GMP')
		ctx.add_group()
		ctx(features='go goprogram', source='pi.go', target='pi')


	import Options, Utils
	if ctx.env.TRY_CGO and Options.options.exe:
		def exe(bld):
			p = Utils.subprocess.Popen('LD_LIBRARY_PATH=build ./build/pi', shell=True)
			p.wait()
		ctx.add_post_fun(exe)