refactor!(haskell): remove dante support

BREAKING CHANGE: Now that haskell-language-server is mature there is
little reason not to pick it over dante.

modules/lang/haskell/+dante.el

@@ -1,41 +0,0 @@
-;;; lang/haskell/+dante.el -*- lexical-binding: t; -*-
-;;;###if (featurep! +dante)
-
-(use-package! dante
-  :hook (haskell-mode-local-vars . dante-mode)
-  :init
-  (setq dante-load-flags '(;; defaults:
-                           "+c"
-                           "-Wwarn=missing-home-modules"
-                           "-fno-diagnostics-show-caret"
-                           ;; necessary to make attrap-attrap useful:
-                           "-Wall"
-                           ;; necessary to make company completion useful:
-                           "-fdefer-typed-holes"
-                           "-fdefer-type-errors"))
-  :config
-  (when (featurep! :checkers syntax)
-    (flycheck-add-next-checker 'haskell-dante '(warning . haskell-hlint)))
-
-  (set-company-backend! 'dante-mode #'dante-company)
-
-  (defadvice! +haskell--restore-modified-state-a (fn &rest args)
-    "Marks the buffer as falsely modified.
-Dante quietly saves the current buffer (without triggering save hooks) before
-invoking flycheck, unexpectedly leaving the buffer in an unmodified state. This
-is annoying if we depend on save hooks to do work on the buffer (like
-reformatting)."
-    :around #'dante-async-load-current-buffer
-    (let ((modified-p (buffer-modified-p)))
-      (apply fn args)
-      (if modified-p (set-buffer-modified-p t))))
-
-  (when (featurep 'evil)
-    (add-hook 'dante-mode-hook #'evil-normalize-keymaps))
-  (map! :map dante-mode-map
-        :localleader
-        "t" #'dante-type-at
-        "i" #'dante-info
-        "l" #'haskell-process-load-file
-        "e" #'dante-eval-block
-        "a" #'attrap-attrap))

modules/lang/haskell/README.org

@@ -18,15 +18,13 @@
 - [[#troubleshooting][Troubleshooting]]
 
 * Description
-This module adds [[https://www.haskell.org/][Haskell]] support, powered by either [[https://github.com/jyp/dante][dante]] (the default) or LSP
+This module adds [[https://www.haskell.org/][Haskell]] support, powered by LSP
 (haskell-language-server).
 
 + Code completion (~company-ghc~)
 + Look up documentation (~hoogle~)
-+ eldoc support (~dante~)
 + REPL (~ghci~)
 + Syntax-checking (~flycheck~)
-+ Code navigation (~dante~)
 + [[https://github.com/hlissner/doom-snippets/tree/master/haskell-mode][Snippets]]
 
 ** External resources
@@ -38,31 +36,19 @@ Here are a few resources I've found indispensable in my Haskell adventures:
 + [[https://docs.haskellstack.org/en/stable/README/][The Haskell Tool Stack docs]]
  
 ** Module Flags
-+ =+dante= Enables dante; a fork of intero aimed at lightweightedness. It
-  doesn't depend on =stack=, supports both ~cabal~-only and ~stack~ projects,
-  but lacks eldoc support.
 + =+lsp= Enables LSP support with haskell-language-server (requires the ~:tools lsp~ module).
 
 ** Plugins
 + [[https://github.com/haskell/haskell-mode][haskell-mode]]
-+ =+dante=
-  + [[https://github.com/jyp/dante][dante]]
-  + [[https://github.com/jyp/attrap][attrap]]
 + =+lsp=
   + [[https://github.com/emacs-lsp/lsp-haskell][lsp-haskell]]
 
 * Prerequisites
-Depending on whether you use Dante or haskell-language-server, your
-dependencies will differ:
 
-+ Dante users need =cabal=, =ghc= and =ghc-mod=
 + LSP users need the =haskell-language-server= LSP server
 + All users will need the =hoogle= package
 
 ** Cabal
-To use Dante, you need =cabal= (the haskell package builder) and =ghci= (the
-compiler, syntax checker & repl):
-
 *** MacOS
 #+BEGIN_SRC sh
 brew install cabal-install ghc
@@ -112,12 +98,6 @@ stack setup
 ** Haskell packages
 You'll need to install the following packages using ~stack~ or ~cabal~:
 
-+ (Dante users) =ghc-mod=
-  #+BEGIN_SRC sh
-  stack install ghc-mod
-  # or
-  cabal install ghc-mod
-  #+END_SRC
 + =hoogle=
   #+BEGIN_SRC sh
   cabal update

modules/lang/haskell/config.el

@@ -46,5 +46,4 @@
 ;;
 ;;; Backends
 
-(cond ((featurep! +dante)  (load! "+dante"))
-      ((featurep! +lsp)    (load! "+lsp")))
+(when (featurep! +lsp) (load! "+lsp"))

modules/lang/haskell/doctor.el

@@ -5,8 +5,7 @@
              (featurep! :tools lsp))
          "This module requires (:tools lsp)")
 
-(when (featurep! +dante)
-  (unless (executable-find "cabal")
-    (warn! "Couldn't find cabal, haskell-mode may have issues"))
-  (unless (executable-find "hlint")
-    (warn! "Couldn't find hlint. Flycheck may have issues in haskell-mode")))
+(unless (executable-find "cabal")
+  (warn! "Couldn't find cabal, haskell-mode may have issues"))
+(unless (executable-find "hlint")
+  (warn! "Couldn't find hlint. Flycheck may have issues in haskell-mode"))

modules/lang/haskell/packages.el

@@ -3,9 +3,6 @@
 
 (package! haskell-mode :pin "98ba3922360199d5260d47f417f096730ad057c5")
 
-(when (featurep! +dante)
-  (package! dante :pin "8741419333fb85ed2c1d71f5902688f5201b0a40")
-  (package! attrap :pin "a5bc695af27349ae6fe4541a581e6fd449d2a026"))
 (when (and (featurep! +lsp)
            (not (featurep! :tools lsp +eglot)))
   (package! lsp-haskell :pin "4e62cf897dd9e9fcef25c6e8e483490a07a5d439"))