dotfiles/emacs-lisp/corfu.org

:PROPERTIES:
:ID:       a4eab1d7-8928-438e-9ccc-1e3a65765534
:END:
#+title: Corfu
#+filetags: emacs-load

# SPDX-FileCopyrightText: 2022 Richard Brežák <richard@brezak.sk>
#
# SPDX-License-Identifier: LGPL-3.0-or-later

#+begin_quote
Corfu enhances completion at point with a small completion popup. The current candidates are shown in a popup below or above the point. Corfu is the minimalistic completion-in-region counterpart of the Vertico minibuffer UI.
#+end_quote

#+begin_src emacs-lisp
    (use-package corfu
      :straight t
      :custom
      (corfu-separator ?\s) ;; M-SPC
      :general
      ("C-c c" 'completion-at-point)
      :init
      (global-corfu-mode))
#+end_src

* Company

#+begin_src emacs-lisp :noweb yes :exports none
  (use-package company
    :defer t
    :init
    <<company-global-modes>>)
#+end_src

Disable ~company~ globally, because company enables itself...

#+name: company-init
#+begin_src emacs-lisp
  (setq company-global-modes nil)
#+end_src

* LSP Mode

#+begin_src emacs-lisp :noweb yes :exports none
  (use-package corfu-lsp-mode
    :no-require t
    :after (lsp-mode corfu)
    :init
    <<lsp-completion-provider>>)
#+end_src

Make ~lsp-mode~ not turn on ~company~ first thing after start, so annoying.

#+name: lsp-completion-provider
#+begin_src emacs-lisp :tangle no
  (setq lsp-completion-provider :none)
#+end_src

* Cape

~cape~ provides useful ~capfs~, such as file and ispell completion, stuff that ~company~ has built-in.

#+begin_src emacs-lisp :noweb yes :exports none
  (use-package cape
    :straight t
    :after (corfu)
    :init
    <<cape-hooks>>)
#+end_src

Hook ~cape~ onto both ~text-mode~ and ~prog-mode~.

#+name: cape-hooks
#+begin_src emacs-lisp :tangle no
  (defun cape-setup-capf-prog ()
    "Setup cape completions for prog-mode"
    (cape-setup-capf))

  (defun cape-setup-capf-text ()
    "Setup cape completions for text-mode"
    (add-hook 'completion-at-point-functions #'cape-ispell)
    (cape-setup-capf))

  (defun cape-setup-capf ()
    "Setup cape completions"
    (add-hook 'completion-at-point-functions #'cape-file)
    (add-hook 'completion-at-point-functions #'cape-tex))
  :hook
  ((prog-mode . cape-setup-capf-prog)
   (text-mode . cape-setup-capf-text))
#+end_src

~lsp-mode~ completely wipes ~completion-at-point-functions~, so we need re-add ~cape~ after it removes everything.

#+begin_src emacs-lisp
  (use-package cape-lsp-mode
    :no-require t
    :after (cape lsp-mode)
    :hook
    ((lsp-mode . 'cape-setup-capf)))
#+end_src