[PATCH 12/15] devtool: ide-sdk: format C/C++ with clangd when .clang-format is present

[AdrianF <adrian.freihofer@siemens.com>]

From: Adrian Freihofer <adrian.freihofer@siemens.com>

Add "[cpp]"/"[c]" defaultFormatter and editor.formatOnSave settings
pointing at the clangd VSCode extension, so devtool ide-sdk-generated
workspaces auto-format on save using the recipe's own .clang-format
style.

Only enabled when clangd is the active IntelliSense engine
(IDE_SDK_INTELLISENSE == "clangd", which also gates whether the clangd
extension is recommended/installed) and a .clang-format file exists in
the recipe source tree, so gcc/cpptools recipes and recipes without a
.clang-format are unaffected.

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
---
 scripts/lib/devtool/ide_plugins/ide_code.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/scripts/lib/devtool/ide_plugins/ide_code.py b/scripts/lib/devtool/ide_plugins/ide_code.py
index 8a8ab8bf3d..f8036f15de 100644
--- a/scripts/lib/devtool/ide_plugins/ide_code.py
+++ b/scripts/lib/devtool/ide_plugins/ide_code.py
@@ -248,6 +248,19 @@ class IdeVSCode(IdeBase):
         # Avoid cpptools (if also installed) fighting clangd over IntelliSense.
         settings_dict["C_Cpp.intelliSenseEngine"] = "disabled"
 
+    def __vscode_settings_format(self, settings_dict, modified_recipe):
+        # clangd is the only formatter wired up here, so only enable it when
+        # clangd is actually the active IntelliSense engine (its extension is
+        # recommended/available).
+        if not (modified_recipe.ide_sdk_intellisense == 'clangd' and modified_recipe.build_tool.is_c_cpp):
+            return
+        # Respect the project's own formatting style only if it opted in.
+        if not os.path.isfile(os.path.join(modified_recipe.real_srctree, '.clang-format')):
+            return
+        settings_dict["[cpp]"] = {"editor.defaultFormatter": "llvm-vs-code-extensions.vscode-clangd"}
+        settings_dict["[c]"] = {"editor.defaultFormatter": "llvm-vs-code-extensions.vscode-clangd"}
+        settings_dict["editor.formatOnSave"] = True
+
     def vscode_settings(self, modified_recipe, image_recipe):
         files_hide = {
             "**/.git/**": True,
@@ -282,6 +295,7 @@ class IdeVSCode(IdeBase):
         self.__vscode_settings_meson(settings_dict, modified_recipe)
         self.__vscode_settings_kernel_module(settings_dict, modified_recipe)
         self.__vscode_settings_clangd(settings_dict, modified_recipe)
+        self.__vscode_settings_format(settings_dict, modified_recipe)
 
         settings_file = 'settings.json'
         IdeBase.update_json_file(
-- 
2.55.0