This is docTHVB9m.info, produced by makeinfo version 6.8 from
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INFO-DIR-SECTION Emacs misc features
START-INFO-DIR-ENTRY
* Corfu: (corfu).       COmpletion in Region FUnction.
END-INFO-DIR-ENTRY


File: docTHVB9m.info,  Node: Top,  Next: Features,  Up: (dir)

corfu.el - COmpletion in Region FUnction
****************************************

Corfu enhances in-buffer completion with a small completion popup.  The
current candidates are shown in a popup below or above the point.  The
candidates can be selected by moving up and down.  Corfu is the
minimalistic in-buffer completion counterpart of the Vertico
(https://github.com/minad/vertico) minibuffer UI.

   Corfu is a small package, which relies on the Emacs completion
facilities and concentrates on providing a polished completion UI.
In-buffer completion UIs in Emacs can hook into ‘completion-in-region’,
which implements the interaction with the user.  Completions at point
are either provided by commands like ‘dabbrev-completion’ or by
pluggable backends (‘completion-at-point-functions’, Capfs) and are then
passed to ‘completion-in-region’.  Many programming, text and shell
major modes implement a Capf.  Corfu does not include its own completion
backends.  The Emacs built-in Capfs and the Capfs provided by
third-party programming language packages are often sufficient.
Additional Capfs and completion utilities are provided by the Cape
(https://github.com/minad/cape) package.

   *NOTE*: Corfu uses child frames to show the popup and falls back to
the default setting of the ‘completion-in-region-function’ on
non-graphical displays.  If you want to use Corfu in the terminal,
install the package corfu-terminal
(https://codeberg.org/akib/emacs-corfu-terminal), which provides an
alternative overlay-based display.

* Menu:

* Features::
* Installation and Configuration::
* Key bindings::
* Extensions::
* Complementary packages::
* Alternatives::
* Debugging Corfu::
* Contributions::

— The Detailed Node Listing —

Installation and Configuration

* Auto completion::
* Completing in the minibuffer::
* Completing in the Eshell or Shell::
* Orderless completion::
* TAB-only completion::
* TAB-and-Go completion::
* Transfer completion to the minibuffer::



File: docTHVB9m.info,  Node: Features,  Next: Installation and Configuration,  Prev: Top,  Up: Top

1 Features
**********

   • Timer-based auto-completions (_off_ by default, set ‘corfu-auto’).
   • Popup display with scrollbar indicator and arrow key navigation.
   • The popup can be summoned explicitly by pressing ‘TAB’ at any time.
   • The current candidate is inserted with ‘TAB’ and selected with
     ‘RET’.
   • Candidate sorting by prefix, string length and alphabetically.
   • The selected candidate is previewed (configurable via
     ‘corfu-preview-current’).
   • The selected candidate is automatically committed on further input
     by default.  (configurable via ‘corfu-preview-current’).
   • Supports the Orderless (https://github.com/oantolin/orderless)
     completion style.  The filter string can contain arbitrary
     characters, after inserting a space via ‘M-SPC’ (configurable via
     ‘corfu-quit-at-boundary’ and ‘corfu-separator’).
   • Lazy completion candidate highlighting for performance.
   • Support for candidate annotations (‘annotation-function’,
     ‘affixation-function’).
   • Deprecated candidates are displayed as crossed out.
   • Icons can be provided by an external package via margin formatter
     functions.
   • Rich set of extensions: Quick keys, Index keys, Sorting by history,
     Candidate documentation in echo area, popup or separate buffer.


File: docTHVB9m.info,  Node: Installation and Configuration,  Next: Key bindings,  Prev: Features,  Up: Top

2 Installation and Configuration
********************************

Corfu is available from GNU ELPA
(https://elpa.gnu.org/packages/corfu.html), such that it can be
installed directly via ‘package-install’.  After installation, the
global minor mode can be enabled with ‘M-x global-corfu-mode’.  In order
to configure Corfu and other packages in your init.el, you may want to
use ‘use-package’.

   Corfu is highly flexible and customizable via ‘corfu-*’ customization
variables, such that you can adapt it precisely to your requirements.
However in order to quickly try out the Corfu completion package, it
should be sufficient to activate ‘global-corfu-mode’.  You can
experiment with manual completion for example in an Elisp buffer or in
an Eshell or Shell buffer.  For auto completion, set ‘corfu-auto’ to t
before turning on ‘global-corfu-mode’.

   Here is an example configuration:

     (use-package corfu
       ;; Optional customizations
       ;; :custom
       ;; (corfu-cycle t)                ;; Enable cycling for `corfu-next/previous'
       ;; (corfu-auto t)                 ;; Enable auto completion
       ;; (corfu-separator ?\s)          ;; Orderless field separator
       ;; (corfu-quit-at-boundary nil)   ;; Never quit at completion boundary
       ;; (corfu-quit-no-match nil)      ;; Never quit, even if there is no match
       ;; (corfu-preview-current nil)    ;; Disable current candidate preview
       ;; (corfu-preselect 'prompt)      ;; Preselect the prompt
       ;; (corfu-on-exact-match nil)     ;; Configure handling of exact matches
       ;; (corfu-scroll-margin 5)        ;; Use scroll margin

       ;; Enable Corfu only for certain modes.
       ;; :hook ((prog-mode . corfu-mode)
       ;;        (shell-mode . corfu-mode)
       ;;        (eshell-mode . corfu-mode))

       ;; Recommended: Enable Corfu globally.  This is recommended since Dabbrev can
       ;; be used globally (M-/).  See also the customization variable
       ;; `global-corfu-modes' to exclude certain modes.
       :init
       (global-corfu-mode))

     ;; A few more useful configurations...
     (use-package emacs
       :init
       ;; TAB cycle if there are only few candidates
       (setq completion-cycle-threshold 3)

       ;; Emacs 28: Hide commands in M-x which do not apply to the current mode.
       ;; Corfu commands are hidden, since they are not supposed to be used via M-x.
       ;; (setq read-extended-command-predicate
       ;;       #'command-completion-default-include-p)

       ;; Enable indentation+completion using the TAB key.
       ;; `completion-at-point' is often bound to M-TAB.
       (setq tab-always-indent 'complete))

   Dabbrev completion is based on ‘completion-in-region’ and can be used
with Corfu.  You may want to swap the ‘dabbrev-completion’ with the
‘dabbrev-expand’ key for easier access, if you prefer completion.  Also
take a look at the ‘cape-dabbrev’ completion at point function provided
by my Cape (https://github.com/minad/cape) package.

     ;; Use Dabbrev with Corfu!
     (use-package dabbrev
       ;; Swap M-/ and C-M-/
       :bind (("M-/" . dabbrev-completion)
              ("C-M-/" . dabbrev-expand))
       ;; Other useful Dabbrev configurations.
       :custom
       (dabbrev-ignored-buffer-regexps '("\\.\\(?:pdf\\|jpe?g\\|png\\)\\'")))

   If you start to configure the package more deeply, I recommend to
give the Orderless completion style a try for filtering.  Orderless
completion is different from the familiar prefix TAB completion.  Corfu
can be used with the default completion styles.  The use of Orderless is
not a necessity.

     ;; Optionally use the `orderless' completion style.
     (use-package orderless
       :init
       ;; Configure a custom style dispatcher (see the Consult wiki)
       ;; (setq orderless-style-dispatchers '(+orderless-dispatch)
       ;;       orderless-component-separator #'orderless-escapable-split-on-space)
       (setq completion-styles '(orderless basic)
             completion-category-defaults nil
             completion-category-overrides '((file (styles partial-completion)))))

   The ‘basic’ completion style is specified as fallback in addition to
‘orderless’ in order to ensure that completion commands which rely on
dynamic completion tables, e.g., ‘completion-table-dynamic’ or
‘completion-table-in-turn’, work correctly.  See ‘+orderless-dispatch’
in the Consult wiki (https://github.com/minad/consult/wiki) for an
advanced Orderless style dispatcher.  Additionally enable
‘partial-completion’ for file path expansion.  ‘partial-completion’ is
important for file wildcard support.  Multiple files can be opened at
once with ‘find-file’ if you enter a wildcard.  You may also give the
‘initials’ completion style a try.

   See also the Corfu Wiki (https://github.com/minad/corfu/wiki) and the
Cape manual (https://github.com/minad/cape) for additional Capf
configuration tips.  For more general documentation read the chapter
about completion in the Emacs manual
(https://www.gnu.org/software/emacs/manual/html_node/emacs/Completion.html).
If you want to create your own Capfs, you can find documentation about
completion in the Elisp manual
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Completion.html).

* Menu:

* Auto completion::
* Completing in the minibuffer::
* Completing in the Eshell or Shell::
* Orderless completion::
* TAB-only completion::
* TAB-and-Go completion::
* Transfer completion to the minibuffer::


File: docTHVB9m.info,  Node: Auto completion,  Next: Completing in the minibuffer,  Up: Installation and Configuration

2.1 Auto completion
===================

Auto completion is disabled by default, but can be enabled by setting
‘corfu-auto’ to t.  Furthermore you may want to configure Corfu to quit
completion eagerly, such that the completion popup stays out of your way
when it appeared unexpectedly.

     ;; Enable auto completion and configure quitting
     (setq corfu-auto t
           corfu-quit-no-match 'separator) ;; or t

   I suggest to experiment with the various settings and key bindings to
find a configuration which works for you.  There is no one perfect
configuration which fits all.  Some people like auto completion, some
like manual completion, some want to cycle with TAB and some with the
arrow keys.

   In case you like auto completion settings, where the completion popup
appears immediately, better use a cheap completion style like ‘basic’,
which performs prefix filtering.  In this case Corfu completion should
still be fast in buffers with efficient completion backends.  You can
try the following settings in an Elisp buffer or the Emacs scratch
buffer.  Note that such settings can slow down Emacs due to the high
load on the Lisp runtime and garbage collector.

     (setq-local corfu-auto        t
                 corfu-auto-delay  0 ;; TOO SMALL - NOT RECOMMENDED
                 corfu-auto-prefix 1 ;; TOO SMALL - NOT RECOMMENDED
                 completion-styles '(basic))

   If you want to combine fast prefix filtering and Orderless filtering
you can still do that by defining a custom Orderless completion style
via ‘orderless-define-completion-style’.  We use a custom style
dispatcher, which enables efficient prefix filtering for input shorter
than 4 characters.  Note that such a setup is advanced.  Please refer to
the Orderless documentation and source code for further details.

     (defun orderless-fast-dispatch (word index total)
       (and (= index 0) (= total 1) (length< word 4)
            `(orderless-regexp . ,(concat "^" (regexp-quote word)))))

     (orderless-define-completion-style orderless-fast
       (orderless-style-dispatchers '(orderless-fast-dispatch))
       (orderless-matching-styles '(orderless-literal orderless-regexp)))

     (setq-local corfu-auto        t
                 corfu-auto-delay  0 ;; TOO SMALL - NOT RECOMMENDED
                 corfu-auto-prefix 1 ;; TOO SMALL - NOT RECOMMENDED
                 completion-styles '(orderless-fast basic))


File: docTHVB9m.info,  Node: Completing in the minibuffer,  Next: Completing in the Eshell or Shell,  Prev: Auto completion,  Up: Installation and Configuration

2.2 Completing in the minibuffer
================================

Corfu can be used for completion in the minibuffer, since it relies on
child frames to display the candidates.  By default, ‘global-corfu-mode’
does not activate ‘corfu-mode’ in the minibuffer, to avoid interference
with specialised minibuffer completion UIs like Vertico or Mct.  However
you may still want to enable Corfu completion for commands like ‘M-:’
(‘eval-expression’) or ‘M-!’ (‘shell-command’), which read from the
minibuffer.  Activate ‘corfu-mode’ only if ‘completion-at-point’ is
bound in the minibuffer-local keymap to achieve this effect.

     (defun corfu-enable-in-minibuffer ()
       "Enable Corfu in the minibuffer if `completion-at-point' is bound."
       (when (where-is-internal #'completion-at-point (list (current-local-map)))
         ;; (setq-local corfu-auto nil) ;; Enable/disable auto completion
         (setq-local corfu-echo-delay nil ;; Disable automatic echo and popup
                     corfu-popupinfo-delay nil)
         (corfu-mode 1)))
     (add-hook 'minibuffer-setup-hook #'corfu-enable-in-minibuffer)

   You can also enable Corfu more generally for every minibuffer, as
long as no completion UI is active.  In the following example we check
for Mct and Vertico.  Furthermore we ensure that Corfu is not enabled if
a password is read from the minibuffer.

     (defun corfu-enable-always-in-minibuffer ()
       "Enable Corfu in the minibuffer if Vertico/Mct are not active."
       (unless (or (bound-and-true-p mct--active)
                   (bound-and-true-p vertico--input)
                   (eq (current-local-map) read-passwd-map))
         ;; (setq-local corfu-auto nil) ;; Enable/disable auto completion
         (setq-local corfu-echo-delay nil ;; Disable automatic echo and popup
                     corfu-popupinfo-delay nil)
         (corfu-mode 1)))
     (add-hook 'minibuffer-setup-hook #'corfu-enable-always-in-minibuffer 1)


File: docTHVB9m.info,  Node: Completing in the Eshell or Shell,  Next: Orderless completion,  Prev: Completing in the minibuffer,  Up: Installation and Configuration

2.3 Completing in the Eshell or Shell
=====================================

When completing in the Eshell I recommend conservative local settings
without auto completion, such that the completion behavior is similar to
widely used shells like Bash, Zsh or Fish.

     (add-hook 'eshell-mode-hook
               (lambda ()
                 (setq-local corfu-auto nil)
                 (corfu-mode)))

   When pressing ‘RET’ while the Corfu popup is visible, the
‘corfu-insert’ command will be invoked.  This command does inserts the
currently selected candidate, but it does not send the prompt input to
Eshell or the Comint process.  Therefore you often have to press ‘RET’
twice which feels like an unnecessary double confirmation.  Fortunately
it is easy to improve this!  In my configuration I define the advice
‘corfu-send-shell’ which sends the candidate after insertion.

     (defun corfu-send-shell (&rest _)
       "Send completion candidate when inside comint/eshell."
       (cond
        ((and (derived-mode-p 'eshell-mode) (fboundp 'eshell-send-input))
         (eshell-send-input))
        ((and (derived-mode-p 'comint-mode)  (fboundp 'comint-send-input))
         (comint-send-input))))

     (advice-add #'corfu-insert :after #'corfu-send-shell)

   Shell completion uses the flexible Pcomplete mechanism internally,
which allows you to program the completions per shell command.  If you
want to know more, look into this blog post
(https://www.masteringemacs.org/article/pcomplete-context-sensitive-completion-emacs),
which shows how to configure Pcomplete for git commands.

   You can try the pcmpl-args
(https://github.com/JonWaltman/pcmpl-args.el) package which extends
Pcomplete with completion support and helpful annotation support for
more commands.  Similar to the Fish shell, ‘pcmpl-args’ uses man page
parsing and ‘--help’ output parsing to dynamically generate completions.
Since Emacs 29, Pcomplete offers the ‘pcomplete-from-help’ function
which parses the ‘--help’ output of a command and produces completions.
This Emacs 29 functionality is not completely equivalent.  For example
it does not display annotations in Eshell, but this may get fixed in
Emacs 30.

   Pcomplete has a few bugs on Emacs 28 and older.  We can work around
the issues with the Cape (https://github.com/minad/cape) library
(Completion at point extensions).  Cape provides wrappers which sanitize
the Pcomplete function.  If you use Emacs 28 or older installing these
advices is recommended such that Pcomplete works properly.  On Emacs 29
the advices should not be necessary anymore, since most of the relevant
bugs have been fixed.  I therefore recommend to remove the advices on
Emacs 29 and eventually report any remaining Pcomplete issues upstream,
such that they can be fixed.

     ;; The advices are only needed on Emacs 28 and older.
     (when (< emacs-major-version 29)
       ;; Silence the pcomplete capf, no errors or messages!
       (advice-add 'pcomplete-completions-at-point :around #'cape-wrap-silent)

       ;; Ensure that pcomplete does not write to the buffer
       ;; and behaves as a pure `completion-at-point-function'.
       (advice-add 'pcomplete-completions-at-point :around #'cape-wrap-purify))


File: docTHVB9m.info,  Node: Orderless completion,  Next: TAB-only completion,  Prev: Completing in the Eshell or Shell,  Up: Installation and Configuration

2.4 Orderless completion
========================

Orderless (https://github.com/oantolin/orderless) is an advanced
completion style that supports multi-component search filters separated
by a configurable character (space, by default).  Normally, entering
characters like space which lie outside the completion region boundaries
(words, typically) causes Corfu to quit.  This behavior is helpful with
auto-completion, which may pop-up when not desired, e.g.  on entering a
new variable name.  Just keep typing and Corfu will get out of the way.

   But orderless search terms can contain arbitrary characters; they are
also interpreted as regular expressions.  To use orderless, set
‘corfu-separator’ (a space, by default) to the primary character of your
orderless component separator.

   Then, when a new orderless component is desired, use ‘M-SPC’
(‘corfu-insert-separator’) to enter the first component separator in the
input, and arbitrary orderless search terms and new separators can be
entered thereafter.

   To treat the entire input as Orderless input, you can set the
customization option ‘corfu-quit-at-boundary’ to nil.  This disables the
predicate which checks if the current completion boundary has been left.
In contrast, if you always want to quit at the boundary, set
‘corfu-quit-at-boundary’ to t.  By default ‘corfu-quit-at-boundary’ is
set to ‘separator’ which quits at completion boundaries as long as no
separator has been inserted with ‘corfu-insert-separator’.

   Finally, there exists the user option ‘corfu-quit-no-match’ which is
set to ‘separator’ by default.  With this setting Corfu stays alive as
soon as you start advanced filtering with a ‘corfu-separator’ even if
there are no matches, for example due to a typo.  As long as no
separator character has been inserted with ‘corfu-insert-separator’,
Corfu will still quit if there are no matches.  This ensures that the
Corfu popup goes away quickly if completion is not possible.

   In the following we show two configurations, one which works best
with auto completion and one which may work better with manual
completion if you prefer to always use ‘SPC’ to separate the Orderless
components.

     ;; Auto completion example
     (use-package corfu
       :custom
       (corfu-auto t)          ;; Enable auto completion
       ;; (corfu-separator ?_) ;; Set to orderless separator, if not using space
       :bind
       ;; Another key binding can be used, such as S-SPC.
       ;; (:map corfu-map ("M-SPC" . corfu-insert-separator))
       :init
       (global-corfu-mode))

     ;; Manual completion example
     (use-package corfu
       :custom
       ;; (corfu-separator ?_) ;; Set to orderless separator, if not using space
       :bind
       ;; Configure SPC for separator insertion
       (:map corfu-map ("SPC" . corfu-insert-separator))
       :init
       (global-corfu-mode))


File: docTHVB9m.info,  Node: TAB-only completion,  Next: TAB-and-Go completion,  Prev: Orderless completion,  Up: Installation and Configuration

2.5 TAB-only completion
=======================

By default, Corfu steals both the ‘RET’ and ‘TAB’ keys, when the Corfu
popup is open.  This can feel intrusive, in particular in combination
with auto completion.  ‘RET’ may accidentally commit an automatically
selected candidate, while you actually wanted to start a new line.  As
an alternative we can unbind the ‘RET’ key completely from ‘corfu-map’
or reserve the ‘RET’ key only in shell modes.

     ;; TAB-only configuration
     (use-package corfu
       :custom
       (corfu-auto t)               ;; Enable auto completion
       (corfu-preselect 'directory) ;; Select the first candidate, except for directories

       ;; Free the RET key for less intrusive behavior.
       :bind
       (:map corfu-map
             ;; Option 1: Unbind RET completely
             ;;; ("RET" . nil)
             ;; Option 2: Use RET only in shell modes
             ("RET" . (menu-item "" nil :filter corfu-insert-shell-filter)))

       :init
       (global-corfu-mode))

     (defun corfu-insert-shell-filter (&optional _)
       "Insert completion candidate and send when inside comint/eshell."
       (when (or (derived-mode-p 'eshell-mode) (derived-mode-p 'comint-mode))
         (lambda ()
           (interactive)
           (corfu-insert)
           ;; `corfu-send-shell' was defined above
           (corfu-send-shell))))


File: docTHVB9m.info,  Node: TAB-and-Go completion,  Next: Transfer completion to the minibuffer,  Prev: TAB-only completion,  Up: Installation and Configuration

2.6 TAB-and-Go completion
=========================

You may be interested in configuring Corfu in TAB-and-Go style.
Pressing TAB moves to the next candidate and further input will then
commit the selection.  Note that further input will not expand snippets
or templates, which may not be desired but which leads overall to a more
predictable behavior.  In order to force snippet expansion, confirm a
candidate explicitly with ‘RET’.

     (use-package corfu
       ;; TAB-and-Go customizations
       :custom
       (corfu-cycle t)           ;; Enable cycling for `corfu-next/previous'
       (corfu-preselect 'prompt) ;; Always preselect the prompt

       ;; Use TAB for cycling, default is `corfu-complete'.
       :bind
       (:map corfu-map
             ("TAB" . corfu-next)
             ([tab] . corfu-next)
             ("S-TAB" . corfu-previous)
             ([backtab] . corfu-previous))

       :init
       (global-corfu-mode))


File: docTHVB9m.info,  Node: Transfer completion to the minibuffer,  Prev: TAB-and-Go completion,  Up: Installation and Configuration

2.7 Transfer completion to the minibuffer
=========================================

Sometimes it is useful to transfer the Corfu completion session to the
minibuffer, since the minibuffer offers richer interaction features.  In
particular, Embark (https://github.com/oantolin/embark) is available in
the minibuffer, such that you can act on the candidates or
export/collect the candidates to a separate buffer.  We could add Corfu
support to Embark in the future, such that export/collect is possible
directly from Corfu.  But in my opinion having the ability to transfer
the Corfu completion to the minibuffer is an even better feature, since
further completion can be performed there.

   The command ‘corfu-move-to-minibuffer’ is defined here in terms of
‘consult-completion-in-region’, which uses the minibuffer completion UI
via ‘completing-read’.

     (defun corfu-move-to-minibuffer ()
       (interactive)
       (when completion-in-region--data
         (let ((completion-extra-properties corfu--extra)
               completion-cycle-threshold completion-cycling)
           (apply #'consult-completion-in-region completion-in-region--data))))
     (keymap-set corfu-map "M-m" #'corfu-move-to-minibuffer)
     (add-to-list 'corfu-continue-commands #'corfu-move-to-minibuffer)


File: docTHVB9m.info,  Node: Key bindings,  Next: Extensions,  Prev: Installation and Configuration,  Up: Top

3 Key bindings
**************

Corfu uses a transient keymap ‘corfu-map’ which is active while the
popup is shown.  The keymap defines the following remappings and
bindings:

   • ‘move-beginning-of-line’ -> ‘corfu-prompt-beginning’
   • ‘move-end-of-line’ -> ‘corfu-prompt-end’
   • ‘beginning-of-buffer’ -> ‘corfu-first’
   • ‘end-of-buffer’ -> ‘corfu-last’
   • ‘scroll-down-command’ -> ‘corfu-scroll-down’
   • ‘scroll-up-command’ -> ‘corfu-scroll-up’
   • ‘next-line’, ‘down’, ‘M-n’ -> ‘corfu-next’
   • ‘previous-line’, ‘up’, ‘M-p’ -> ‘corfu-previous’
   • ‘completion-at-point’, ‘TAB’ -> ‘corfu-complete’
   • ‘RET’ -> ‘corfu-insert’
   • ‘M-g’ -> ‘corfu-info-location’
   • ‘M-h’ -> ‘corfu-info-documentation’
   • ‘M-SPC’ -> ‘corfu-insert-separator’
   • ‘C-g’ -> ‘corfu-quit’
   • ‘keyboard-escape-quit’ -> ‘corfu-reset’


File: docTHVB9m.info,  Node: Extensions,  Next: Complementary packages,  Prev: Key bindings,  Up: Top

4 Extensions
************

We maintain small extension packages to Corfu in this repository in the
subdirectory extensions/
(https://github.com/minad/corfu/tree/main/extensions).  The extensions
are installed together with Corfu if you pull the package from ELPA.
The extensions are inactive by default and can be enabled manually if
desired.  Furthermore it is possible to install all of the files
separately, both ‘corfu.el’ and the ‘corfu-*.el’ extensions.  Currently
the following extensions come with the Corfu ELPA package:

   • corfu-echo
     (https://github.com/minad/corfu/blob/main/extensions/corfu-echo.el):
     ‘corfu-echo-mode’ displays a brief candidate documentation in the
     echo area.
   • corfu-history
     (https://github.com/minad/corfu/blob/main/extensions/corfu-history.el):
     ‘corfu-history-mode’ remembers selected candidates and sorts the
     candidates by their history position.
   • corfu-indexed
     (https://github.com/minad/corfu/blob/main/extensions/corfu-indexed.el):
     ‘corfu-indexed-mode’ allows you to select indexed candidates with
     prefix arguments.
   • corfu-info
     (https://github.com/minad/corfu/blob/main/extensions/corfu-info.el):
     Actions to access the candidate location and documentation.
   • corfu-popupinfo
     (https://github.com/minad/corfu/blob/main/extensions/corfu-popupinfo.el):
     Display candidate documentation or source in a popup next to the
     candidate menu.
   • corfu-quick
     (https://github.com/minad/corfu/blob/main/extensions/corfu-quick.el):
     Commands to select using Avy-style quick keys.

   See the Commentary of those files for configuration details.


File: docTHVB9m.info,  Node: Complementary packages,  Next: Alternatives,  Prev: Extensions,  Up: Top

5 Complementary packages
************************

Corfu works well together with all packages providing code completion
via the ‘completion-at-point-functions’.  Many modes and packages
already provide a Capf out of the box.  Nevertheless you may want to
look into complementary packages to enhance your setup.

   • corfu-terminal (https://codeberg.org/akib/emacs-corfu-terminal):
     The corfu-terminal package provides an overlay-based display for
     Corfu, such that you can use Corfu in terminal Emacs.

   • corfu-candidate-overlay
     (https://code.bsdgeek.org/adam/corfu-candidate-overlay): Shows
     as-you-type auto-suggestion candidate overlay with a visual
     indication of whether there are many or exactly one candidate
     available (works only with ‘corfu-auto’ disabled).

   • Orderless (https://github.com/oantolin/orderless): Corfu supports
     completion styles, including the advanced ‘orderless’ completion
     style, where the filter expressions are separated by spaces or
     another character (see ‘corfu-separator’).

   • Cape (https://github.com/minad/cape): Provides additional Capf
     backends and ‘completion-in-region’ commands.  Among others, the
     package supplies the file completion backend ‘cape-file’ and the
     Dabbrev backend ‘cape-dabbrev’.  Cape provides the
     ‘cape-company-to-capf’ adapter to reuse Company backends in Corfu.

   • nerd-icons-corfu (https://github.com/LuigiPiucco/nerd-icons-corfu),
     kind-icon (https://github.com/jdtsmith/kind-icon): Icons are
     supported by Corfu via external packages.  The nerd-icons-corfu
     package relies on the Nerd icon font, which is even supported on
     terminal, while kind-icon uses SVGs from monochromatic icon sets.

   • pcmpl-args (https://github.com/JonWaltman/pcmpl-args.el): Extend
     the Eshell/Shell Pcomplete mechanism with support for many
     commands.  Similar to the Fish shell, pcmpl-args uses man page
     parsing to dynamically retrieve the completions and helpful
     annotations.

   • Tempel (https://github.com/minad/tempel): Tiny template/snippet
     package with templates in Lisp syntax, which can be used in
     conjunction with Corfu.

   • Vertico (https://github.com/minad/vertico): You may also want to
     look into my Vertico package.  Vertico is the minibuffer completion
     counterpart of Corfu.


File: docTHVB9m.info,  Node: Alternatives,  Next: Debugging Corfu,  Prev: Complementary packages,  Up: Top

6 Alternatives
**************

   • Company (https://github.com/company-mode/company-mode): Company is
     a widely used and mature completion package, which implements a
     similar UI as Corfu.  While Corfu relies exclusively on the
     standard Emacs completion API (Capfs), Company defines its own API
     for the backends.  Company includes its own completion backends,
     following its own API, which are incompatible with the Emacs
     completion infrastructure.  Company provides an adapter
     ‘company-capf’ to handle Capfs as a Company backend.  As a result
     of this design, Company is a more complex package than Corfu.
     Company by default uses overlays for the popup in contrast to the
     child frames used by Corfu.  Overall both packages work well, but
     Company integrates less tightly with Emacs.  The
     ‘completion-styles’ support is more limited and the
     ‘completion-at-point’ command and the ‘completion-in-region’
     function do not invoke Company.

   • consult-completion-in-region (https://github.com/minad/consult):
     The Consult package provides the function
     ‘consult-completion-in-region’ which can be set as
     ‘completion-in-region-function’ such that it handles
     ‘completion-at-point’.  The function works by transferring the
     in-buffer completion to the minibuffer.  In the minibuffer, the
     minibuffer completion UI, for example Vertico
     (https://github.com/minad/vertico) takes over.  If you prefer to
     perform all your completions in the minibuffer
     ‘consult-completion-in-region’ is your best option.


File: docTHVB9m.info,  Node: Debugging Corfu,  Next: Contributions,  Prev: Alternatives,  Up: Top

7 Debugging Corfu
*****************

When you observe an error in the ‘corfu--post-command’ post command
hook, you should install an advice to enforce debugging.  This allows
you to obtain a stack trace in order to narrow down the location of the
error.  The reason is that post command hooks are automatically disabled
(and not debugged) by Emacs.  Otherwise Emacs would become unusable,
given that the hooks are executed after every command.

     (setq debug-on-error t)

     (defun force-debug (func &rest args)
       (condition-case e
           (apply func args)
         ((debug error) (signal (car e) (cdr e)))))

     (advice-add #'corfu--post-command :around #'force-debug)

   When Capfs do not yield the expected result you can use
‘cape-capf-debug’ to add debug messages to a Capf.  The Capf will then
produce a completion log in the messages buffer.

     (setq completion-at-point-functions (list (cape-capf-debug #'cape-dict)))


File: docTHVB9m.info,  Node: Contributions,  Prev: Debugging Corfu,  Up: Top

8 Contributions
***************

Since this package is part of GNU ELPA
(https://elpa.gnu.org/packages/corfu.html) contributions require a
copyright assignment to the FSF.



Tag Table:
Node: Top208
Node: Features2271
Node: Installation and Configuration3750
Node: Auto completion9432
Node: Completing in the minibuffer11989
Node: Completing in the Eshell or Shell14145
Node: Orderless completion17582
Node: TAB-only completion20676
Node: TAB-and-Go completion22224
Node: Transfer completion to the minibuffer23335
Node: Key bindings24773
Node: Extensions25892
Node: Complementary packages27692
Node: Alternatives30210
Node: Debugging Corfu31956
Node: Contributions33012

End Tag Table


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