module: add :completion corfu

This commit's primary goal is allowing use of
[minad/corfu](https://github.com/minad/corfu) as an alternative to
[company](https://github.com/company-mode/company-mode). It introduces a
module under :completion for this purpose, plus some conditionals on
other relevant modules to toggle functionality like lsp back-ends and
[minad/cape](https://github.com/minad/cape) capfs for certain modes.

Other optional or miscellaneous features include:

- Support for displaying the completion's documentation on a secondary
  popup;
- Support for terminal display if :os tty;
- Support for icons if +icons;
- Support for tab-and-go completion if +tng;
This commit is contained in:
Luigi Sartor Piucco 2022-09-24 17:33:32 -03:00
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commit c6b7eb6e7c
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#+title: :completion corfu
#+subtitle: Complete with cap(f), cape and a flying feather
#+created: September 9, 2022
#+since: 3.0.0 (#7002)
* Description :unfold:
This module provides code completion, powered by [[doom-package:corfu]].
It is recommended to enable either this or [[doom-module::completion company]], in
case you desire pre-configured auto-completion. Corfu is much lighter weight and
focused, plus it's built on native Emacs functionality, whereas company is heavy
and highly non-native, but has some extra features and more maturity.
** Maintainers
- [[doom-user:][@LuigiPiucco]]
[[doom-contrib-maintainer:][Become a maintainer?]]
** Module flags
- +icons ::
Display icons beside completion suggestions.
- +tng ::
Known as Tab'n'Go to Company users, changes behavior to invoke completion on
[[kbd:][TAB]]. When Corfu is active, [[kbd:][TAB]] and [[kbd:][S-TAB]] will navigate the completion
candidates. Arrow keys and evil-style movement are still supported.
- +orderless ::
Pull in [[doom-package:orderless]] if necessary and apply multi-component
completion (still needed if [[doom-module::completion vertico]] is active).
** Packages
- [[doom-package:corfu]]
- [[doom-package:cape]]
- [[doom-package:nerd-icons-corfu]] if [[doom-module::completion corfu +icons]]
- [[doom-package:orderless]] if [[doom-module::completion corfu +orderless]]
- [[doom-package:corfu-terminal]] if [[doom-module::os tty]]
** Hacks
/No hacks documented for this module./
** TODO Changelog
# This section will be machine generated. Don't edit it by hand.
/This module does not have a changelog yet./
* Installation
Enable this module in your ~doom!~ block.
This module has no direct requirements, but some languages may have their own
requirements to fulfill before you get code completion in them (and some
languages may lack code completion support altogether). Run ~$ doom doctor~ to
find out if you're missing any dependencies. Note that Corfu may have support
for completions in languages that have no development intelligence, since it
supports generic, context insensitive candidates such as file names or recurring
words.
* TODO Usage
#+begin_quote
🔨 /This module's usage documentation is incomplete./ [[doom-contrib-module:][Complete it?]]
#+end_quote
** Code completion
By default, completion gets triggered after typing 2 non-space consecutive
characters, or by means of the [[kbd:][C-SPC]] keybinding at any moment. While the popup
is visible, the following relevant keys are available:
| Keybind | Description |
|----------+------------------------------------------------------------------|
| [[kbd:][<down>]] | Go to next candidate |
| [[kbd:][<up>]] | Go to previous candidate |
| [[kbd:][C-n]] | Go to next candidate |
| [[kbd:][C-p]] | Go to previous candidate |
| [[kbd:][C-j]] | (evil) Go to next candidate |
| [[kbd:][C-k]] | (evil) Go to previous candidate |
| [[kbd:][C-<down>]] | Go to next doc line |
| [[kbd:][C-<up>]] | Go to previous doc line |
| [[kbd:][C-S-n]] | Go to next doc line |
| [[kbd:][C-S-p]] | Go to previous doc line |
| [[kbd:][C-S-j]] | (evil) Go to next doc line |
| [[kbd:][C-S-k]] | (evil) Go to previous doc line |
| [[kbd:][C-h]] | Toggle documentation (if available) |
| [[kbd:][M-m]] | Export to minibuffer (if [[doom-module::completion vertico]]) |
| [[kbd:][M-S-j]] | (evil) Export to minibuffer (if [[doom-module::completion vertico]]) |
| [[kbd:][RET]] | Insert candidate |
| [[kbd:][SPC]] | (after wildcard) Reset completion |
| [[kbd:][DEL]] | Reset completion |
| [[kbd:][C-SPC]] | Complete (unless [[doom-module::completion corfu +tng]]) |
| [[kbd:][C-SPC]] | (when completing) Insert separator DWIM (see below) |
If you prefer a [[kbd:][TAB]]-centric completion style, enable the [[doom-module::completion
corfu +tng]] flag so that, instead, you trigger completion with [[kbd:][TAB]], getting the
following additional binds:
| Keybind | Description |
|---------+-----------------------------------------------|
| [[kbd:][TAB]] | Complete |
| [[kbd:][TAB]] | (when completing) Go to next candidate |
| [[kbd:][S-TAB]] | (when completing) Go to previous candidate |
** Searching with multiple keywords
If the [[doom-module::completion corfu +orderless]] flag is enabled, users can
perform code completion with multiple search keywords by use of space as the
separator. More information can be found [[https://github.com/oantolin/orderless#company][here]]. Pressing [[kdb:][C-SPC]] again while
completing inserts a space as separator. This allows searching with
space-separated terms; each piece will match individually and in any order, with
smart casing. Pressing just [[kbd:][SPC]] acts as normal and quits completion, so that
when typing sentences it doesn't try to complete the whole sentence instead of
just the word.
Additionally, for users of evil and regular corfu style, [[kdb:][C-SPC]] is smart
regarding your state. In normal-like states, enter insert then start corfu; in
visual-like states, perform [[help:evil-change][evil-change]] (which leaves you in insert state) then
start corfu; in insert-like states, start corfu immediatelly.
** Exporting to the minibuffer (requires [[doom-module::completion vertico]])
When using the [[doom-module::completion vertico]] module, which pulls in the
[[doom-package:consult]] package, the entries shown in the completion popup can be
exported to a consult minibuffer, giving access to all the manipulations the
Vertico suite allows. For instance, one could use this to export with
[[doom-package:embark]] via [[kbd:][C-c C-l]] and get a buffer with all candidates.
* Configuration
A few variables may be set to change behavior of this module:
- [[var:corfu-auto-delay]] ::
Number of seconds till completion occurs automatically. Defaults to 0.1.
- [[var:corfu-auto-prefix]] ::
Number of characters till auto-completion starts to happen. Defaults to 2.
- [[var:corfu-on-exact-match]] ::
Configures behavior for exact matches. Its default is nil, and it's
recommended to leave it at that. Otherwise, single matches on snippet keys
expand immediately.
** Adding CAPFs to a mode
To add other CAPFs on a mode-per-mode basis, put either of the following in your
~config.el~:
#+begin_src emacs-lisp
(add-hook! some-mode (add-to-list 'completion-at-point-functions #'some-capf))
;; OR, but note the different call signature
(add-hook 'some-mode-hook (lambda () (add-to-list 'completion-at-point-functions #'some-capf)))
#+end_src
~DEPTH~ above is an integer between -100, 100, and defaults to 0 of omitted. Also
see ~add-hook!~'s documentation for additional ways to call it. ~add-hook~ only
accepts the quoted arguments form above.
* Troubleshooting
[[doom-report:][Report an issue?]]
* Frequently asked questions
/This module has no FAQs yet./ [[doom-suggest-faq:][Ask one?]]
* TODO Appendix
#+begin_quote
🔨 This module has no appendix yet. [[doom-contrib-module:][Write one?]]
#+end_quote

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;;; completion/corfu/autoload.el -*- lexical-binding: t; -*-
;;;###autoload
(defun +corfu-move-to-minibuffer ()
;; Taken from corfu's README.
;; TODO: extend this to other completion front-ends.
(interactive)
(let ((completion-extra-properties corfu--extra)
(completion-cycle-threshold completion-cycling))
(apply #'consult-completion-in-region completion-in-region--data)))

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;;; completion/corfu/config.el -*- lexical-binding: t; -*-
;;
;;; Packages
(use-package! corfu
:hook (doom-first-input . global-corfu-mode)
:config
(setq corfu-auto t
corfu-auto-delay 0.1
corfu-auto-prefix 2
global-corfu-modes '((not
erc-mode
circe-mode
help-mode
gud-mode
vterm-mode)
t)
corfu-cycle t
corfu-separator (when (modulep! +orderless) ?\s)
corfu-preselect 'valid
corfu-count 16
corfu-max-width 120
corfu-preview-current 'insert
corfu-on-exact-match nil
corfu-quit-at-boundary (if (modulep! +orderless) 'separator t)
corfu-quit-no-match (if (modulep! +orderless) 'separator t)
;; In the case of +tng, TAB should be smart regarding completion;
;; However, it should otherwise behave like normal, whatever normal was.
tab-always-indent (if (modulep! +tng) 'complete tab-always-indent))
(add-to-list 'completion-category-overrides `(lsp-capf (styles ,@completion-styles)))
(map! :map corfu-mode-map
:e "C-M-i" #'completion-at-point
:i "C-SPC" #'completion-at-point
:n "C-SPC" (cmd! (call-interactively #'evil-insert-state)
(call-interactively #'completion-at-point))
:v "C-SPC" (cmd! (call-interactively #'evil-change)
(call-interactively #'completion-at-point)))
(map! :unless (modulep! :editor evil)
:map corfu-mode-map
"C-M-i" #'completion-at-point)
(after! evil
(add-hook 'evil-insert-state-exit-hook #'corfu-quit))
(when (modulep! +icons)
(add-to-list 'corfu-margin-formatters #'nerd-icons-corfu-formatter))
(map! :map corfu-map
[return] #'corfu-insert
"RET" #'corfu-insert)
(when (modulep! +orderless)
(map! :map corfu-map
"C-SPC" #'corfu-insert-separator))
(when (modulep! +tng)
(map! :map corfu-map
[tab] #'corfu-next
[backtab] #'corfu-previous
"TAB" #'corfu-next
"S-TAB" #'corfu-previous)
(let ((cmds-del (cmds! (and (modulep! +tng)
(> corfu--index -1)
(eq corfu-preview-current 'insert))
#'corfu-reset)))
(map! :map corfu-map
[backspace] cmds-del
"DEL" cmds-del)))
(after! vertico
(map! :map corfu-map
"M-m" #'+corfu-move-to-minibuffer
(:when (modulep! :editor evil)
"M-J" #'+corfu-move-to-minibuffer))))
(use-package! cape
:defer t
:init
(add-hook! prog-mode
(defun +corfu-add-cape-file-h ()
(add-to-list 'completion-at-point-functions #'cape-file)))
(add-hook! (org-mode markdown-mode)
(defun +corfu-add-cape-elisp-block-h ()
(add-to-list 'completion-at-point-functions #'cape-elisp-block)))
(advice-add #'lsp-completion-at-point :around #'cape-wrap-noninterruptible))
(use-package! corfu-terminal
:when (not (display-graphic-p))
:hook ((corfu-mode . corfu-terminal-mode)))
;;
;;; Extensions
(use-package! corfu-history
:hook ((corfu-mode . corfu-history-mode))
:config
(after! savehist (add-to-list 'savehist-additional-variables 'corfu-history)))
(use-package! corfu-popupinfo
:hook ((corfu-mode . corfu-popupinfo-mode))
:config
(setq corfu-popupinfo-delay '(0.5 . 1.0))
(map! :map corfu-map
"C-<up>" #'corfu-popupinfo-scroll-down
"C-<down>" #'corfu-popupinfo-scroll-up
"C-S-p" #'corfu-popupinfo-scroll-down
"C-S-n" #'corfu-popupinfo-scroll-up
"C-h" #'corfu-popupinfo-toggle)
(map! :when (modulep! :editor evil)
:map corfu-popupinfo-map
;; Reversed because popupinfo assumes opposite of what feels intuitive
;; with evil.
"C-S-k" #'corfu-popupinfo-scroll-down
"C-S-j" #'corfu-popupinfo-scroll-up))

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;; -*- no-byte-compile: t; -*-
;;; completion/corfu/packages.el
(package! corfu :pin "24dccafeea114b1aec7118f2a8405b46aa0051e0")
(package! cape :pin "18a30f48bb8754421cb10dad99e0a406173d4551")
(when (modulep! +icons)
(package! nerd-icons-corfu :pin "7077bb76fefc15aed967476406a19dc5c2500b3c"))
(when (modulep! +orderless)
(package! orderless :pin "b24748093b00b37c3a572c4909f61c08fa27504f"))
(when (modulep! :os tty)
(package! corfu-terminal :pin "501548c3d51f926c687e8cd838c5865ec45d03cc"))

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@ -138,8 +138,11 @@ server getting expensively restarted when reverting buffers."
" ")) " "))
(add-to-list 'global-mode-string (add-to-list 'global-mode-string
'(t (:eval lsp-modeline-icon)) '(t (:eval lsp-modeline-icon))
'append)))))) 'append)))))
(when (modulep! :completion corfu)
(setq lsp-completion-provider :none)
(add-hook 'lsp-mode-hook #'lsp-completion-mode)))
(use-package! lsp-ui (use-package! lsp-ui
:hook (lsp-mode . lsp-ui-mode) :hook (lsp-mode . lsp-ui-mode)