emacs: Enable Dart support

modules/programs/emacs/default.nix

@@ -48,6 +48,8 @@ in {
           json-mode
           rust-mode
           yaml-mode
+          lsp-mode lsp-treemacs flycheck company
+          dart-mode lsp-dart
         ];
       };
     };

modules/programs/emacs/dotemacs

@@ -7,8 +7,7 @@
 (setq redisplay-dont-pause t)
 (setq jit-lock-defer-time 0)
 (setq fast-but-imprecise-scrolling t)
-(setq make-backup-files nil)
-(setq create-lockfiles nil)
+(setq make-backup-files nil) (setq create-lockfiles nil)
 
 ;; A trick for faster startup is to just disable GC for the init phase
 ;;; See: https://github.com/nilcons/emacs-use-package-fast#a-trick-less-gc-during-startup
@@ -208,6 +207,11 @@
 (use-package json-mode)
 (use-package rust-mode)
 (use-package yaml-mode)
+(add-hook 'dart-mode-hook 'lsp)
+(setq lsp-lens-enable t
+      lsp-signature-auto-activate nil
+      company-minimum-prefix-length 1
+      read-process-output-max (* 1024 1024))
 
 ;; Debugging
 ;(use-package explain-pause-mode