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import SCons.Util, os

def generate(env) :
	def modify_targets(target, source, env) :
		target = [env.File("html/index.html")]
		return target, source

	def generate_actions(source, target, env, for_signature) :
		if env.WhereIs("$DOXYGEN") and env.WhereIs("$DOT") :
			return [SCons.Action.Action("$DOXYGEN $SOURCE", cmdstr = "$DOXYCOMSTR")]
		else :
			return []

	env["DOXYGEN"] = "doxygen"
	# FIXME: For some reason, things go incredibly slow (at least on OS X)
	# when not doing this. Some environment flag is having an effect on
	# this; find out which
	env["ENV"] = os.environ
	env["DOT"] = "dot"
	env["BUILDERS"]["DoxyGen"] = SCons.Builder.Builder(
		emitter = modify_targets,
		generator = generate_actions,
		single_source = True)

def exists(env) :
	return True