Add C++ auto format hook

1 files changed, 19 insertions, 1 deletions

diff --git a/lisp/cpp.el b/lisp/cpp.el
index c22f771..d6b1cad 100644
--- a/lisp/cpp.el
+++ b/lisp/cpp.el
@@ -1,4 +1,9 @@
 
+(use-package clang-format
+  :ensure t)
+(use-package projectile
+  :ensure t)
+
 ;;; Code:
 (defun setup-c()
   "Set up c common mode."
@@ -26,10 +31,23 @@
   (shell-command (format "cd %s && cmake -S . -B build -D CMAKE_EXPORT_COMPILE_COMMANDS=1" (projectile-project-root)))
   )
 
-(defun maybe-regenerate-compile-commands()
+(defun mk/cpp/maybe-regenerate-compile-commands()
   (if (string= (buffer-file-name) "CMakeLists.txt")
       (mk/cpp/generate-compile-commands-cmake)))
 
+(defun mk/clang-format-buffer-if-project-file ()
+  "Run clang-format-buffer only if a .clang-format exists in the Projectile project."
+  (when (and (projectile-project-p) ; inside a projectile project
+             (locate-dominating-file (buffer-file-name) ".clang-format"))
+    (clang-format-buffer)))
+
+;; Add this hook to C/C++/ObjC modes
+(add-hook 'c-mode-common-hook
+          (lambda ()
+            (add-hook 'before-save-hook
+                      #'mk/clang-format-buffer-if-project-file
+                      nil 'local)))
+
 (add-hook 'after-save-hook 'maybe-regenerate-compile-commands)
 
 (provide 'cpp)