refactor(lsp): switch to flycheck-eglot package

We no longer need to maintain our own juryrigged version of this
functionality.

modules/tools/lsp/+eglot.el

@@ -25,10 +25,6 @@
 
   (add-to-list 'doom-debug-variables '(eglot-events-buffer-size . 0))
 
-  (when (modulep! :checkers syntax)
-    (after! flycheck
-      (load! "autoload/flycheck-eglot")))
-
   (defadvice! +lsp--defer-server-shutdown-a (fn &optional server)
     "Defer server shutdown for a few seconds.
 This gives the user a chance to open other project files before the server is
@@ -55,3 +51,8 @@ server getting expensively restarted when reverting buffers."
   :when (modulep! :completion vertico)
   :init
   (map! :map eglot-mode-map [remap xref-find-apropos] #'consult-eglot-symbols))
+
+
+(use-package! flycheck-eglot
+  :when (modulep! :checkers syntax)
+  :hook (eglot-managed-mode . flycheck-eglot-mode))

modules/tools/lsp/autoload/flycheck-eglot.el

@@ -1,76 +0,0 @@
-;;; flycheck-eglot --- Hacky eglot support in flycheck -*- lexical-binding: t; -*-
-;;; Commentary:
-;; This file sets up flycheck so that, when eglot receives a publishDiagnostics method
-;; from the server, flycheck updates the reports.
-;;
-;; Thanks to:
-;; - joaotavora for adding a handle to plug flycheck, and
-;; - purcell for finding out the initial stub and the current implementation
-;;
-;; It works by creating a bridge function which can be used as the argument of
-;; `eglot-flymake-backend', which both consumes diagnostics and queue a call to
-;; 'flycheck-buffer'
-;;
-;;; Code:
-
-(defvar-local +lsp--flycheck-eglot--current-errors nil)
-
-(defun +lsp--flycheck-eglot-init (checker callback)
-  "CHECKER is the checker (eglot).
-CALLBACK is the function that we need to call when we are done, on all the errors."
-  (eglot-flymake-backend #'+lsp--flycheck-eglot--on-diagnostics)
-  (funcall callback 'finished +lsp--flycheck-eglot--current-errors))
-
-(defun +lsp--flycheck-eglot--on-diagnostics (diags &rest _)
-  (cl-labels
-      ((flymake-diag->flycheck-err
-        (diag)
-        (with-current-buffer (flymake--diag-buffer diag)
-          (flycheck-error-new-at-pos
-           (flymake--diag-beg diag)
-           (pcase (flymake--diag-type diag)
-             ('eglot-note 'info)
-             ('eglot-warning 'warning)
-             ('eglot-error 'error)
-             (_ (error "Unknown diagnostic type, %S" diag)))
-           (flymake--diag-text diag)
-           :end-pos (flymake--diag-end diag)
-           :checker 'eglot
-           :buffer (current-buffer)
-           :filename (buffer-file-name)))))
-    (setq +lsp--flycheck-eglot--current-errors
-          (mapcar #'flymake-diag->flycheck-err diags))
-    ;; Call Flycheck to update the diagnostics annotations
-    (flycheck-buffer-deferred)))
-
-(defun +lsp--flycheck-eglot-available-p ()
-  (bound-and-true-p eglot--managed-mode))
-
-(flycheck-define-generic-checker 'eglot
-  "Report `eglot' diagnostics using `flycheck'."
-  :start #'+lsp--flycheck-eglot-init
-  :predicate #'+lsp--flycheck-eglot-available-p
-  :modes '(prog-mode text-mode))
-
-(push 'eglot flycheck-checkers)
-
-(add-hook! 'eglot-managed-mode-hook
-  (defun +lsp-eglot-prefer-flycheck-h ()
-    (when eglot--managed-mode
-      (flymake-mode -1)
-      (when-let ((current-checker (flycheck-get-checker-for-buffer)))
-        (unless (equal current-checker 'eglot)
-          (flycheck-add-next-checker 'eglot current-checker)))
-      (flycheck-add-mode 'eglot major-mode)
-      (flycheck-mode 1)
-      ;; Call flycheck on initilization to make sure to display initial
-      ;; errors
-      (flycheck-buffer-deferred))))
-
-(after! flymake
-  (when (and
-         (not (fboundp 'flymake--diag-buffer))
-         (fboundp 'flymake--diag-locus))
-    (defalias 'flymake--diag-buffer 'flymake--diag-locus)))
-
-;;; flycheck-eglot.el ends here

modules/tools/lsp/packages.el

@@ -5,7 +5,9 @@
     (progn
       (package! eglot :pin "e501275e06952889056268dabe08ccd0dbaf23e5")
       (when (modulep! :completion vertico)
-        (package! consult-eglot :pin "6504ccd2b7555452c61cc24a45965f7e2a37c44d")))
+        (package! consult-eglot :pin "6504ccd2b7555452c61cc24a45965f7e2a37c44d"))
+      (when (modulep! :checkers syntax)
+        (package! flycheck-eglot :pin "9abab011071c93250a894cf2bfeaf30c8e3367a7")))
   (package! lsp-mode :pin "a655f3600e040f872408da0e9c1b9fe65ca0aad9")
   (package! lsp-ui :pin "295d8984da06a745b0a36c56e28ce915bc389adb")
   (when (modulep! :completion ivy)