Implement a way to dump the gdnative_interface.h file from the executable

8 files changed, 83 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index 1a83e4707e..f430ac10e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,7 @@ platform/windows/godot_res.res
 
 # Generated by Godot binary
 .import/
+/gdnative_interface.h
 extension_api.json
 logs/
 
diff --git a/core/extension/SCsub b/core/extension/SCsub
index 23727c1b76..a8f68a1533 100644
--- a/core/extension/SCsub
+++ b/core/extension/SCsub
@@ -3,10 +3,15 @@
 Import("env")
 
 import make_wrappers
+import make_interface_dumper
 from platform_methods import run_in_subprocess
 
 env.CommandNoCache(["ext_wrappers.gen.inc"], "make_wrappers.py", run_in_subprocess(make_wrappers.run))
-
+env.CommandNoCache(
+    "gdnative_interface_dump.gen.h",
+    ["gdnative_interface.h", "make_interface_dumper.py"],
+    run_in_subprocess(make_interface_dumper.run),
+)
 
 env_extension = env.Clone()
 
diff --git a/core/extension/make_interface_dumper.py b/core/extension/make_interface_dumper.py
new file mode 100644
index 0000000000..cc85c728d5
--- /dev/null
+++ b/core/extension/make_interface_dumper.py
@@ -0,0 +1,47 @@
+def run(target, source, env):
+    src = source[0]
+    dst = target[0]
+    f = open(src, "r", encoding="utf-8")
+    g = open(dst, "w", encoding="utf-8")
+
+    g.write(
+        """/* THIS FILE IS GENERATED DO NOT EDIT */
+#ifndef GDNATIVE_INTERFACE_DUMP_H
+#define GDNATIVE_INTERFACE_DUMP_H
+
+#ifdef TOOLS_ENABLED
+
+#include "core/io/file_access.h"
+#include "core/string/ustring.h"
+
+class GDNativeInterfaceDump {
+	private:
+        static constexpr char const *gdnative_interface_dump ="""
+    )
+    for line in f:
+        g.write('"' + line.rstrip().replace('"', '\\"') + '\\n"\n')
+    g.write(";\n")
+
+    g.write(
+        """
+    public:
+        static void generate_gdnative_interface_file(const String &p_path) {
+            Ref<FileAccess> fa = FileAccess::open(p_path, FileAccess::WRITE);
+            CharString cs(gdnative_interface_dump);
+            fa->store_buffer((const uint8_t *)cs.ptr(), cs.length());
+        };
+};
+
+#endif // TOOLS_ENABLED
+
+#endif // GDNATIVE_INTERFACE_DUMP_H
+"""
+    )
+    g.close()
+    f.close()
+
+
+if __name__ == "__main__":
+    from platform_methods import subprocess_main
+
+    subprocess_main(globals())
diff --git a/main/main.cpp b/main/main.cpp
index 08a9b4c310..85415e24d2 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -36,6 +36,7 @@
 #include "core/crypto/crypto.h"
 #include "core/debugger/engine_debugger.h"
 #include "core/extension/extension_api_dump.h"
+#include "core/extension/gdnative_interface_dump.gen.h"
 #include "core/extension/native_extension_manager.h"
 #include "core/input/input.h"
 #include "core/input/input_map.h"
@@ -199,6 +200,7 @@ static MovieWriter *movie_writer = nullptr;
 static bool disable_vsync = false;
 static bool print_fps = false;
 #ifdef TOOLS_ENABLED
+static bool dump_gdnative_interface = false;
 static bool dump_extension_api = false;
 #endif
 bool profile_gpu = false;
@@ -414,6 +416,7 @@ void Main::print_help(const char *p_binary) {
 	OS::get_singleton()->print("  --doctool [<path>]                           Dump the engine API reference to the given <path> (defaults to current dir) in XML format, merging if existing files are found.\n");
 	OS::get_singleton()->print("  --no-docbase                                 Disallow dumping the base types (used with --doctool).\n");
 	OS::get_singleton()->print("  --build-solutions                            Build the scripting solutions (e.g. for C# projects). Implies --editor and requires a valid project to edit.\n");
+	OS::get_singleton()->print("  --dump-gdextension-interface                 Generate GDExtension header file 'gdnative_interface.h' in the current folder. This file is the base file required to implement a GDExtension.\n");
 	OS::get_singleton()->print("  --dump-extension-api                         Generate JSON dump of the Godot API for GDExtension bindings named 'extension_api.json' in the current folder.\n");
 	OS::get_singleton()->print("  --startup-benchmark                          Benchmark the startup time and print it to console.\n");
 	OS::get_singleton()->print("  --startup-benchmark-file <path>              Benchmark the startup time and save it to a given file in JSON format.\n");
@@ -1054,6 +1057,16 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 			auto_build_solutions = true;
 			editor = true;
 			cmdline_tool = true;
+		} else if (I->get() == "--dump-gdextension-interface") {
+			// Register as an editor instance to use low-end fallback if relevant.
+			editor = true;
+			cmdline_tool = true;
+			dump_gdnative_interface = true;
+			print_line("Dumping gdnative interface header file");
+			// Hack. Not needed but otherwise we end up detecting that this should
+			// run the project instead of a cmdline tool.
+			// Needs full refactoring to fix properly.
+			main_args.push_back(I->get());
 		} else if (I->get() == "--dump-extension-api") {
 			// Register as an editor instance to use low-end fallback if relevant.
 			editor = true;
@@ -2549,8 +2562,15 @@ bool Main::start() {
 		return false;
 	}
 
+	if (dump_gdnative_interface) {
+		GDNativeInterfaceDump::generate_gdnative_interface_file("gdnative_interface.h");
+	}
+
 	if (dump_extension_api) {
 		NativeExtensionAPIDump::generate_extension_json_file("extension_api.json");
+	}
+
+	if (dump_gdnative_interface || dump_extension_api) {
 		return false;
 	}
 
diff --git a/misc/dist/linux/godot.6 b/misc/dist/linux/godot.6
index 07e2a389a7..766be6d0a7 100644
--- a/misc/dist/linux/godot.6
+++ b/misc/dist/linux/godot.6
@@ -150,6 +150,12 @@ Disallow dumping the base types (used with \fB\-\-doctool\fR).
 \fB\-\-build\-solutions\fR
 Build the scripting solutions (e.g. for C# projects). Implies \-\-editor and requires a valid project to edit.
 .TP
+\fB\-\-dump\-gdextension\-interface\fR
+Generate GDExtension header file 'gdnative_interface.h' in the current folder. This file is the base file required to implement a GDExtension.
+.TP
+\fB\-\-dump\-extension\-api\fR
+Generate JSON dump of the Godot API for GDExtension bindings named 'extension_api.json' in the current folder.
+.TP
 \fB\-\-test\fR <test>
 Run a unit test ('string', 'math', 'physics', 'physics_2d', 'render', 'oa_hash_map', 'gui', 'shaderlang', 'gd_tokenizer', 'gd_parser', 'gd_compiler', 'gd_bytecode', 'ordered_hash_map', 'astar').
 .SH FILES
diff --git a/misc/dist/shell/_godot.zsh-completion b/misc/dist/shell/_godot.zsh-completion
index 2bc6fe9317..18b74115bf 100644
--- a/misc/dist/shell/_godot.zsh-completion
+++ b/misc/dist/shell/_godot.zsh-completion
@@ -84,5 +84,6 @@ _arguments \
   '--doctool[dump the engine API reference to the given path in XML format, merging if existing files are found]:path to base Godot build directory (optional):_dirs' \
   '--no-docbase[disallow dumping the base types (used with --doctool)]' \
   '--build-solutions[build the scripting solutions (e.g. for C# projects)]' \
+  '--dump-gdextension-interface[generate GDExtension header file 'gdnative_interface.h' in the current folder. This file is the base file required to implement a GDExtension.]' \
   '--dump-extension-api[generate JSON dump of the Godot API for GDExtension bindings named "extension_api.json" in the current folder]' \
   '--test[run all unit tests; run with "--test --help" for more information]'
diff --git a/misc/dist/shell/godot.bash-completion b/misc/dist/shell/godot.bash-completion
index bc5fa600f5..871c8f8eac 100644
--- a/misc/dist/shell/godot.bash-completion
+++ b/misc/dist/shell/godot.bash-completion
@@ -86,6 +86,7 @@ _complete_godot_options() {
 --doctool
 --no-docbase
 --build-solutions
+--dump-gdextension-interface
 --dump-extension-api
 --test
 " -- "$1"))
diff --git a/misc/dist/shell/godot.fish b/misc/dist/shell/godot.fish
index 9ac692eace..9cbec8a4f6 100644
--- a/misc/dist/shell/godot.fish
+++ b/misc/dist/shell/godot.fish
@@ -106,5 +106,6 @@ complete -c godot -l validate-conversion-3to4 -d "Shows what elements will be re
 complete -c godot -l doctool -d "Dump the engine API reference to the given path in XML format, merging if existing files are found" -r
 complete -c godot -l no-docbase -d "Disallow dumping the base types (used with --doctool)"
 complete -c godot -l build-solutions -d "Build the scripting solutions (e.g. for C# projects)"
+complete -c godot -l dump-gdextension-interface -d "Generate GDExtension header file 'gdnative_interface.h' in the current folder. This file is the base file required to implement a GDExtension"
 complete -c godot -l dump-extension-api -d "Generate JSON dump of the Godot API for GDExtension bindings named 'extension_api.json' in the current folder"
 complete -c godot -l test -d "Run all unit tests; run with '--test --help' for more information" -x