doomemacs/core/core-flycheck.el

;;; core-flycheck.el --- check yourself before you shrek yourself

(use-package flycheck
  :commands (flycheck-mode flycheck-list-errors flycheck-buffer)
  :init
  (setq flycheck-indication-mode 'right-fringe
        ;; Removed checks on idle/change for snappiness
        flycheck-check-syntax-automatically '(save mode-enabled)
        flycheck-disabled-checkers '(emacs-lisp emacs-lisp-checkdoc make))

  :config
  (unless (> emacs-major-version 24)
    ;; Fixes Unknown defun property `interactive-only' error (in emacs <25) by compiling
    ;; flycheck source files
    (let ((path (locate-library "flycheck")))
      (unless (f-ext? path "elc")
        (byte-compile-file path))))

  (map! :map flycheck-error-list-mode-map
        :n "C-n" 'flycheck-error-list-next-error
        :n "C-p" 'flycheck-error-list-previous-error
        :n "j"   'flycheck-error-list-next-error
        :n "k"   'flycheck-error-list-previous-error
        :n "RET" 'flycheck-error-list-goto-error)

  ;; Flycheck buffer on ESC in normal mode.
  (advice-add 'evil-force-normal-state :after 'doom*flycheck-buffer)

  (define-fringe-bitmap 'flycheck-fringe-bitmap-double-arrow
    [0 0 0 8 24 56 120 248 120 56 24 8 0 0 0]
    ;; (fringe-helper-convert
    ;;  "........"
    ;;  "........"
    ;;  "........"
    ;;  "....X..."
    ;;  "...XX..."
    ;;  "..XXX..."
    ;;  ".XXXX..."
    ;;  "XXXXX..."
    ;;  ".XXXX..."
    ;;  "..XXX..."
    ;;  "...XX..."
    ;;  "....X..."
    ;;  "........"
    ;;  "........"
    ;;  "........")
    ))

(use-package flycheck-package
  :after flycheck
  :config (flycheck-package-setup))

(use-package flycheck-pos-tip
  :when (= emacs-major-version 24)
  :after flycheck
  :config
  (setq flycheck-pos-tip-timeout 10
        flycheck-display-errors-delay 0.5)
  (flycheck-pos-tip-mode +1))

(use-package flyspell :commands flyspell-mode)

(provide 'core-flycheck)
;;; core-flycheck.el ends here