Enable crystal with crystalline as lsp

arch-config/.doom.d/config.el

@@ -85,3 +85,13 @@
 ;; work around emacs hanging when opening any python requirements.txt file
 ;; see issue https://github.com/doomemacs/doomemacs/issues/5998
 (advice-add #'pip-requirements-fetch-packages :override #'ignore)
+
+;; enable crystalline lsp for crystal-mode
+(with-eval-after-load 'lsp-mode
+  (add-to-list 'lsp-language-id-configuration
+               '(crystal-mode . "crystal"))
+  (lsp-register-client
+  (make-lsp-client :new-connection (lsp-stdio-connection '("crystalline"))
+                   :activation-fn (lsp-activate-on "crystal")
+                   :priority '1
+                   :server-id 'crystalline)))

arch-config/.doom.d/init.el

@@ -115,7 +115,7 @@
        ;;clojure           ; java with a lisp
        ;;common-lisp       ; if you've seen one lisp, you've seen them all
        ;;coq               ; proofs-as-programs
-       ;(crystal +lsp)           ; ruby at the speed of c
+       (crystal +lsp)           ; ruby at the speed of c
        ;;csharp            ; unity, .NET, and mono shenanigans
        ;;data              ; config/data formats
        ;;(dart +flutter)   ; paint ui and not much else