dotfiles/emacs-lisp/flycheck.org

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:PROPERTIES:
:ID: 334a4188-93e6-4378-b22d-b0c302fc26a1
:END:
#+title: Flycheck
#+filetags: emacs-load
* Flycheck Posframe
Display flycheck messages in a posframe.
#+begin_src emacs-lisp noweb: yes
(use-package flycheck-posframe
:straight t
:config
(setq flycheck-posframe-position 'frame-bottom-right-corner)
<<flycheck-display-errors-delay>>
<<lsp-ui-sideline-show-diagnostics>>
:hook (flycheck-mode . flycheck-posframe-mode))
#+end_src
Flycheck calls ~flycheck-display-errors-function~ every ~flycheck-display-errors-delay~.
#+name: flycheck-display-errors-delay
#+begin_src emacs-lisp
(setq flycheck-display-errors-delay 0.1)
#+end_src
Since we get errors and such in a posframe, we don't need them in the sideline.
#+name: lsp-ui-sideline-show-diagnostics
#+begin_src emacs-lisp
(setq lsp-ui-sideline-show-diagnostics nil)
#+end_src
Since flycheck recalls ~flycheck-display-errors-function~ on every point movement, it creates this really ugly flicker and also lags a bit,
so if the diagnostic message didn't change, filter out the call.
#+name: flycheck-posframe-change-filter
#+begin_src emacs-lisp
(defvar flycheck-posframe-last-error-list '())
(advice-add
'flycheck-posframe-hidehandler
:override
(lambda (info)
(if (not (equal
(flycheck-overlay-errors-at (point))
flycheck-posframe-last-error-list))
(progn
(setq flycheck-posframe-last-error-list nil)
t)
nil))
'((name . "flycheck-error-display-filter")))
(advice-add
'flycheck-posframe-show-posframe
:before-while
(lambda (diagnostic)
(let ((last-list flycheck-posframe-last-error-list))
(setq flycheck-posframe-last-error-list diagnostic)
(if (equal diagnostic last-list) nil t)))
'((name . "flycheck-error-display-filter")))
#+end_src