add flycheck-clj-kondo as an optional package

layers/+lang/clojure/README.org

@@ -18,6 +18,8 @@
 - [[#usage][Usage]]
   - [[#cheatsheet][Cheatsheet]]
   - [[#linting][Linting]]
+    - [[#squiggly-linter][Squiggly linter]]
+    - [[#clj-kondo-linter][clj-kondo linter]]
   - [[#structuraly-safe-editing][Structuraly safe editing]]
 - [[#key-bindings][Key bindings]]
   - [[#working-with-clojure-files-barfage-slurpage--more][Working with clojure files (barfage, slurpage & more)]]
@@ -189,10 +191,21 @@ some functions that deal with sorting maps.
 
 ** Linting
 Linting works via flycheck and disabled by default.
-You can enable it like this:
+
+*** Squiggly linter
+
+It uses [[https://github.com/clojure-emacs/squiggly-clojure][squiggly-clojure]] behind the scene. You can enable it like this:
 
 #+BEGIN_SRC emacs-lisp
-  (setq clojure-enable-linters t)
+  (setq clojure-enable-linters 'squiggly)
+#+END_SRC
+
+*** clj-kondo linter
+
+This linter based on static syntax check, require [[https://github.com/borkdude/clj-kondo][clj-kondo]] installed on your PATH. Detailed installation instructions can be found [[https://github.com/borkdude/clj-kondo/blob/master/doc/install.md][here]].
+
+#+BEGIN_SRC emacs-lisp
+  (setq clojure-enable-linters 'clj-kondo)
 #+END_SRC
 
 Make sure to read the [[https://github.com/clojure-emacs/squiggly-clojure#warnings][warnings section]].

layers/+lang/clojure/packages.el

@@ -20,7 +20,8 @@
         eldoc
         evil-cleverparens
         flycheck
-        (flycheck-clojure :toggle clojure-enable-linters)
+        (flycheck-clojure :toggle (eq clojure-enable-linters 'squiggly))
+        (flycheck-clj-kondo :toggle (eq clojure-enable-linters 'clj-kondo))
         ggtags
         counsel-gtags
         helm-gtags
@@ -173,7 +174,7 @@
       (with-eval-after-load 'golden-ratio
         (add-to-list 'golden-ratio-extra-commands 'cider-popup-buffer-quit-function))
       ;; setup linters. NOTE: It must be done after both CIDER and Flycheck are loaded.
-      (when clojure-enable-linters
+      (when (eq clojure-enable-linters 'squiggly)
         (with-eval-after-load 'flycheck (flycheck-clojure-setup)))
       ;; add support for evil
       (evil-set-initial-state 'cider-stacktrace-mode 'motion)
@@ -433,3 +434,7 @@
 (defun clojure/init-flycheck-clojure ()
   (use-package flycheck-clojure
     :if (configuration-layer/package-usedp 'flycheck)))
+
+(defun clojure/init-flycheck-clj-kondo ()
+  (use-package flycheck-clj-kondo
+    :if (configuration-layer/package-usedp 'flycheck)))