godot/modules/gdscript/editor/script_templates/SCsub

#!/usr/bin/env python

Import("env")

import editor.template_builders as build_template_gd

env["BUILDERS"]["MakeGDTemplateBuilder"] = Builder(
    action=env.Run(build_template_gd.make_templates),
    suffix=".h",
    src_suffix=".gd",
)

# Template files
templates_sources = Glob("*/*.gd")

env.Alias("editor_template_gd", [env.MakeGDTemplateBuilder("templates.gen.h", templates_sources)])