#! /usr/bin/env python
# encoding: utf-8

import os
import Task,Options,Utils
from TaskGen import taskgen,before,feature
from Configure import conf
def init_rubyext(self):
	self.default_install_path='${ARCHDIR_RUBY}'
	self.uselib=self.to_list(getattr(self,'uselib',''))
	if not'RUBY'in self.uselib:
		self.uselib.append('RUBY')
	if not'RUBYEXT'in self.uselib:
		self.uselib.append('RUBYEXT')
def apply_ruby_so_name(self):
	self.env['shlib_PATTERN']=self.env['rubyext_PATTERN']
def check_ruby_version(conf,minver=()):
	if Options.options.rubybinary:
		conf.env.RUBY=Options.options.rubybinary
	else:
		conf.find_program("ruby",var="RUBY",mandatory=True)
	ruby=conf.env.RUBY
	try:
		version=Utils.cmd_output([ruby,'-e','puts defined?(VERSION) ? VERSION : RUBY_VERSION']).strip()
	except:
		conf.fatal('could not determine ruby version')
	conf.env.RUBY_VERSION=version
	try:
		ver=tuple(map(int,version.split(".")))
	except:
		conf.fatal('unsupported ruby version %r'%version)
	cver=''
	if minver:
		if ver<minver:
			conf.fatal('ruby is too old')
		cver=".".join(str(x)for x in minver)
	conf.check_message('ruby',cver,True,version)
def check_ruby_ext_devel(conf):
	if not conf.env.RUBY:
		conf.fatal('ruby detection is required first')
	if not conf.env.CC_NAME and not conf.env.CXX_NAME:
		conf.fatal('load a c/c++ compiler first')
	version=tuple(map(int,conf.env.RUBY_VERSION.split(".")))
	def read_out(cmd):
		return Utils.to_list(Utils.cmd_output([conf.env.RUBY,'-rrbconfig','-e',cmd]))
	def read_config(key):
		return read_out('puts Config::CONFIG[%r]'%key)
	ruby=conf.env['RUBY']
	archdir=read_config('archdir')
	cpppath=archdir
	if version>=(1,9,0):
		ruby_hdrdir=read_config('rubyhdrdir')
		cpppath+=ruby_hdrdir
		cpppath+=[os.path.join(ruby_hdrdir[0],read_config('arch')[0])]
	conf.check(header_name='ruby.h',includes=cpppath,mandatory=True,errmsg='could not find ruby header file')
	conf.env.LIBPATH_RUBYEXT=read_config('libdir')
	conf.env.LIBPATH_RUBYEXT+=archdir
	conf.env.CPPPATH_RUBYEXT=cpppath
	conf.env.CCFLAGS_RUBYEXT=read_config("CCDLFLAGS")
	conf.env.rubyext_PATTERN='%s.'+read_config('DLEXT')[0]
	flags=read_config('LDSHARED')
	while flags and flags[0][0]!='-':
		flags=flags[1:]
	if len(flags)>1 and flags[1]=="ppc":
		flags=flags[2:]
	conf.env.LINKFLAGS_RUBYEXT=flags
	conf.env.LINKFLAGS_RUBYEXT+=read_config("LIBS")
	conf.env.LINKFLAGS_RUBYEXT+=read_config("LIBRUBYARG_SHARED")
	if Options.options.rubyarchdir:
		conf.env.ARCHDIR_RUBY=Options.options.rubyarchdir
	else:
		conf.env.ARCHDIR_RUBY=read_config('sitearchdir')[0]
	if Options.options.rubylibdir:
		conf.env.LIBDIR_RUBY=Options.options.rubylibdir
	else:
		conf.env.LIBDIR_RUBY=read_config('sitelibdir')[0]
def set_options(opt):
	opt.add_option('--with-ruby-archdir',type='string',dest='rubyarchdir',help='Specify directory where to install arch specific files')
	opt.add_option('--with-ruby-libdir',type='string',dest='rubylibdir',help='Specify alternate ruby library path')
	opt.add_option('--with-ruby-binary',type='string',dest='rubybinary',help='Specify alternate ruby binary')

taskgen(init_rubyext)
before('apply_incpaths','apply_type_vars','apply_lib_vars')(init_rubyext)
feature('rubyext')(init_rubyext)
before('apply_bundle')(init_rubyext)
before('apply_link')(apply_ruby_so_name)
feature('rubyext')(apply_ruby_so_name)
conf(check_ruby_version)
conf(check_ruby_ext_devel)
