#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2016
#

import os
from waflib import TaskGen, Build, Utils

@TaskGen.feature('ruler')
@TaskGen.before('process_rule')
def test(self):
	if not self.bld.is_install or self.bld.is_install == Build.UNINSTALL:
		while self.meths: # do not generate tasks: the target file may not be there
			self.meths.pop()
		return

	tg = self.bld.get_tgen_by_name(self.bring_in)
	tg.post() # let it create its installation task
	assert tg.install_task.outputs
	self.source = tg.install_task.outputs

def configure(conf):

	tmpdir = conf.bldnode.make_node('tmpdir')

	def build(bld):
		bld.is_install = env.INSTALL
		bld.path.make_node('tmpfile').write('test')
		bld.env.PREFIX = tmpdir.abspath()
		bld.install_as('${PREFIX}/bin/foo', 'tmpfile', chmod=Utils.O755)
		bld.symlink_as('${PREFIX}/bin/bar', '../tmpfile')
		tsk = bld.install_files('${PREFIX}/bin', 'tmpfile', chmod=Utils.O755, name='cheese')
		bld(rule='ls -l ${SRC}', always=True, bring_in='cheese', features='ruler')

	env = conf.env.derive()
	env.INSTALL = Build.INSTALL
	conf.run_build(build_fun=build, msg='building', okmsg='ok', errmsg='eh', env=env)
	assert tmpdir.exists()
	assert tmpdir.make_node('bin/foo').exists()
	assert tmpdir.make_node('bin/tmpfile').abspath()
	assert tmpdir.make_node('bin/foo').read() == tmpdir.make_node('bin/tmpfile').read()
	assert os.path.lexists(tmpdir.make_node('bin/bar').abspath())
	assert os.readlink(tmpdir.make_node('bin/bar').abspath()) == '../tmpfile'

	env.INSTALL = Build.UNINSTALL
	conf.run_build(build_fun=build, msg='building', okmsg='ok', errmsg='eh', env=env)
	assert not tmpdir.exists()
	assert not tmpdir.make_node('bin/foo').exists()
	assert not tmpdir.make_node('bin/tmpfile').exists()
	assert not os.path.lexists(tmpdir.make_node('bin/bar').abspath())
	assert not tmpdir.exists()