Add Language Server

- Use ccls as language server for C/C++

config.org

@@ -15,14 +15,11 @@ My personal emacs configuration
 This configuration requires the installation of :
 
     - the GNU =global= package (for gtags)
-    - =clang= (for ivory)
-    - =cmake= (for ivory)
-    - =llvm-libs= (for cmake, somehow not a dependency on Manjaro when installing cmake)
+    - =ccls=, a language server for C/C++
     - Use python-pip to install requirements for elpy:
       =pip install jedi flake8 importmagic autopep8 yapf=
     - =ditaa= (for ascii to image generation in org-mode)
 
-When first checking out this config, run =irony-install-server= to make and install the irony-server.
 * Workarounds
 ** Emacs 26.2
 
@@ -846,29 +843,6 @@ https://github.com/joaotavora/yasnippet
 )
 #+END_SRC
 
-** Flycheck
-
-On-the-fly syntax checking.
-
-#+BEGIN_SRC emacs-lisp
-(use-package flycheck
-  :ensure t
-  :config
-    (add-hook 'prog-mode-hook 'flycheck-mode)
-)
-#+END_SRC
-
-** Company mode
-
-#+BEGIN_SRC emacs-lisp
-(use-package company
-  :ensure t
-  :config
-    (setq company-idle-delay 0)
-    (setq company-minimum-prefix-length 2))
-    (add-hook 'prog-mode-hook 'company-mode)
-#+END_SRC
-
 ** (Relative) Line numbers
 
 #+BEGIN_SRC emacs-lisp
@@ -883,10 +857,9 @@ On-the-fly syntax checking.
 
 *** Flycheck
 
-Clang static analyzer with flycheck
+Clang static analyzer with flycheck (On-the-fly syntax checking)
 
 https://github.com/alexmurray/flycheck-clang-analyzer
-https://github.com/Sarcasm/flycheck-irony
 
 #+BEGIN_SRC emacs-lisp
 (use-package flycheck-clang-analyzer
@@ -895,44 +868,36 @@ https://github.com/Sarcasm/flycheck-irony
   (with-eval-after-load 'flycheck
     (require 'flycheck-clang-analyzer)
      (flycheck-clang-analyzer-setup)))
-
-(use-package flycheck-irony
-  :ensure t
-  :config
-    (eval-after-load 'flycheck
-      '(add-hook 'flycheck-mode-hook #'flycheck-irony-setup))
-)
 #+END_SRC
 
 *** Company
 
-https://github.com/ikirill/irony-eldoc
-
 #+BEGIN_SRC emacs-lisp
-(use-package company-c-headers
-  :ensure t)
-
-(use-package company-irony
+(use-package lsp-mode
+  :commands lsp
    :ensure t
-  :config
-  (setq company-backends '((company-c-headers
-;;                            company-dabbrev-code ;; not sure what this is
-                            company-irony))))
-
-(use-package irony
-  :ensure t
-  :config
-    (add-hook 'irony-mode-hook 'irony-cdb-autosetup-compile-options)
-    (add-hook 'c++-mode-hook 'irony-mode)
-    (add-hook 'c-mode-hook 'irony-mode)
-    (add-hook 'objc-mode-hook 'irony-mode)
 )
 
-(use-package irony-eldoc
+(use-package lsp-ui
+  :commands lsp-ui-mode
+  :ensure t
+)
+
+(use-package company-lsp
+  :ensure t
+  :commands company-lsp
+  :config (push 'company-lsp company-backends)) ;; add company-lsp as a backend
+
+(use-package ccls
   :ensure t
   :config
-    (add-hook 'irony-mode-hook 'irony-eldoc)
+  (setq ccls-executable "ccls")
+  (setq lsp-prefer-flymake nil) ;; Disable flymake for syntax checking, use flycheck instead
+  (setq-default flycheck-disabled-checkers '(c/c++-clang c/c++-cppcheck c/c++-gcc))
+  :hook ((c-mode c++-mode objc-mode) .
+         (lambda () (require 'ccls) (lsp)))
 )
+
 #+END_SRC
 
 ** Python mode