waf: implement 'reconfigure' module

scripts/waflib/reconfigure.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# encoding: utf-8
+# Copyright (c) 2019 mittorn
+
+'''
+Reconfigure
+
+Store/load configuration user input
+
+Usage:
+		def options(opt):
+			opt.load('reconfigure')
+
+		def configure(conf):
+			conf.load('reconfigure')
+
+		./waf configure --reconfigure
+'''
+
+from waflib import Configure, Logs, Options, Utils, ConfigSet
+import os
+
+import optparse
+STORE_PATH = 'build/configuration.py'
+
+def options(opt):
+	opt.add_option('--rebuild-cache', dest='rebuild_cache', default=False, action='store_true', help='load previous configuration')
+	opt.add_option('--reconfigure', dest='reconfigure', default=False, action='store_true', help='load and update configuration')
+
+def configure(conf):
+	store_data = ConfigSet.ConfigSet()
+	options = vars(conf.options)
+	environ = conf.environ
+	if conf.options.reconfigure or conf.options.rebuild_cache:
+		store_data.load(STORE_PATH)
+		if conf.options.reconfigure:
+			for o in options:
+				if options[o]: store_data['OPTIONS'][o] = options[o]
+			store_data['ENVIRON'].update(environ)
+			store_data.store(STORE_PATH)
+		conf.environ = store_data['ENVIRON']
+		conf.options = optparse.Values(store_data['OPTIONS'])
+	else:
+	    store_data['OPTIONS'] = vars(conf.options)
+	    store_data['ENVIRON'] = conf.environ
+	    store_data.store(STORE_PATH)
+	    

wscript

@@ -66,8 +66,11 @@ def options(opt):
 	opt.load('xcompile compiler_cxx compiler_c sdl2')
 	if sys.platform == 'win32':
 		opt.load('msvc msdev msvs')
+	opt.load('reconfigure')
+
 
 def configure(conf):
+	conf.load('reconfigure')
 	conf.start_msg('Build type')
 	if conf.options.BUILD_TYPE == None:
 		conf.end_msg('not set', color='RED')