Set up clangd (#148)

* Set up clangd

* configure.py: Specify Generator type arguments

.clangd

@@ -0,0 +1,10 @@
+CompileFlags:
+  Add:
+  - -m32
+  - -nostdinc
+  - -Iinclude
+  - -Ilibs/c/include
+  - -Ilibs/cpp/include
+  - -Ilibs/nds/include
+  - -Ilibs/nitro/include
+  - -Ilibs/nns/include

.gitignore

@@ -19,3 +19,4 @@ build.ninja
 .ninja_deps
 /wibo
 /sjiswrap.exe
+/compile_commands.json

tools/configure.py

@@ -6,7 +6,7 @@ from pathlib import Path
 import argparse
 import sys
 import subprocess
-from typing import Any
+from typing import Any, Generator
 
 import ninja_syntax
 from get_platform import Platform, get_platform
@@ -165,9 +165,12 @@ class Project:
     def build_rom_config(self) -> Path:
         return self.game_build / "build" / "rom_config.yaml"
 
+    def source_files(self) -> Generator[Path, None, None]:
+        yield from get_c_cpp_files([src_path, libs_path])
+
     def source_object_files(self) -> list[str]:
         files: list[str] = []
-        for source_file in get_c_cpp_files([src_path, libs_path]):
+        for source_file in self.source_files():
             src_obj_path = self.game_build / source_file
             files.append(str(src_obj_path.with_suffix(".o")))
         return files
@@ -361,6 +364,8 @@ def main():
         )
         n.newline()
 
+        create_compilation_database(project)
+
         add_download_tool_builds(n, project)
         add_configure_build(n, project)
 
@@ -735,5 +740,19 @@ def get_config_files(game_config: Path, name: str) -> list[str]:
     ]
 
 
+def create_compilation_database(project: Project):
+    db_path = root_path / "compile_commands.json"
+    db: list[dict] = []
+    abs_root_path = root_path.absolute()
+    for src_file in project.source_files():
+        db.append({
+            "directory": str(abs_root_path),
+            "arguments": ["#"], # clangd ignores entries with empty arguments
+            "file": str(src_file)
+        })
+    with db_path.open("w") as f:
+        f.write(json.dumps(db))
+
+
 if __name__ == "__main__":
     main()