fixing c++ and eglot systems

README.org

@@ -2002,7 +2002,36 @@ I'm gonna try this to speed up emacs and make it nicer
 *** C++
 In c++ I just want to make sure lsp is called when enter c++-mode
 #+BEGIN_SRC emacs-lisp
-(add-hook 'c++-mode-hook 'eglot)
+(defun astyle-this-buffer ()
+  "Use astyle command to auto format c/c++ code."
+  (interactive "r")
+  (let* ((original-point (point))) ;; save original point before processing, thanks to @Scony
+    (progn
+      (if (executable-find "astyle")
+          (shell-command-on-region
+           (point-min) (point-max)
+           (concat
+            "astyle"
+            " --style=" cc-mode-code-style
+            " --indent=spaces=" (number-to-string c-basic-offset)
+            " --pad-oper"
+            " --pad-header"
+            " --break-blocks"
+            " --delete-empty-lines"
+            " --align-pointer=type"
+            " --align-reference=name")
+           (current-buffer) t
+           (get-buffer-create "*Astyle Errors*") t)
+        (message "Cannot find binary \"astyle\", please install first."))
+      (goto-char original-point)))) ;; restore original point
+
+(defun astyle-before-save ()
+  "Auto styling before saving."
+  (interactive)
+  (when (member major-mode '(cc-mode c++-mode c-mode))
+    (astyle-this-buffer)))
+
+(add-hook 'c-mode-common-hook (lambda () (add-hook 'before-save-hook 'astyle-before-save)))
 #+END_SRC
 
 *** Web
@@ -2094,7 +2123,7 @@ Let's give eglot a try.
 (use-package eglot
   :commands eglot
   :hook
-  (c++-mode . eglot))
+  (c++-mode . eglot-ensure))
 #+end_src
 
 #+begin_src emacs-lisp

init.el

@@ -1374,7 +1374,36 @@ targets."
   )
 (use-package tree-sitter-langs)
 
-(add-hook 'c++-mode-hook 'eglot)
+(defun astyle-this-buffer ()
+  "Use astyle command to auto format c/c++ code."
+  (interactive "r")
+  (let* ((original-point (point))) ;; save original point before processing, thanks to @Scony
+    (progn
+      (if (executable-find "astyle")
+          (shell-command-on-region
+           (point-min) (point-max)
+           (concat
+            "astyle"
+            " --style=" cc-mode-code-style
+            " --indent=spaces=" (number-to-string c-basic-offset)
+            " --pad-oper"
+            " --pad-header"
+            " --break-blocks"
+            " --delete-empty-lines"
+            " --align-pointer=type"
+            " --align-reference=name")
+           (current-buffer) t
+           (get-buffer-create "*Astyle Errors*") t)
+        (message "Cannot find binary \"astyle\", please install first."))
+      (goto-char original-point)))) ;; restore original point
+
+(defun astyle-before-save ()
+  "Auto styling before saving."
+  (interactive)
+  (when (member major-mode '(cc-mode c++-mode c-mode))
+    (astyle-this-buffer)))
+
+(add-hook 'c-mode-common-hook (lambda () (add-hook 'before-save-hook 'astyle-before-save)))
 
 (use-package web-mode
   :config
@@ -1408,7 +1437,7 @@ targets."
 (use-package eglot
   :commands eglot
   :hook
-  (c++-mode . eglot))
+  (c++-mode . eglot-ensure))
 
 (use-package consult-eglot)