#+TITLE:   completion/vertico
#+DATE:    July 25, 2021
#+SINCE:   v3.0.0
#+STARTUP: inlineimages

* Table of Contents :TOC_3:noexport:
- [[#description][Description]]
  - [[#maintainers][Maintainers]]
  - [[#module-flags][Module Flags]]
  - [[#plugins][Plugins]]
- [[#prerequisites][Prerequisites]]
- [[#features][Features]]
  - [[#vertico-keybindings][Vertico keybindings]]
  - [[#jump-to-navigation][Jump-to navigation]]
  - [[#project-search--replace][Project search & replace]]
  - [[#in-buffer-searching][In-buffer searching]]
  - [[#vertico-integration-for-various-completing-commands][Vertico integration for various completing commands]]
    - [[#general][General]]
    - [[#jump-to-files-buffers-or-projects][Jump to files, buffers or projects]]
    - [[#search][Search]]
  - [[#marginalia][Marginalia]]
  - [[#orderless-filtering][Orderless filtering]]
- [[#configuration][Configuration]]

* Description
This module enhances the Emacs search and completion experience, and also
provides a united interface for project search and replace, powered by [[https://github.com/BurntSushi/ripgrep/][ripgrep]].

It does this with several modular packages focused on enhancing the built-in
~completing-read~ interface, rather than replacing it with a parallel ecosystem
like =ivy= and =helm= do. The primary packages are:

+ Vertico, which provides the vertical completion user interface
+ Consult, which provides a suite of useful commands using ~completing-read~
+ Embark, which provides a set of minibuffer actions
+ Marginalia, which provides annotations to completion candidates
+ Orderless, which provides better filtering methods

** Maintainers
+ @iyefrat

** Module Flags
+ =+icons= Adds icons to =file= and =buffer= category completion selections.

** Plugins
+ [[https://github.com/minad/vertico][vertico]]
+ [[https://github.com/minad/consult][consult]]
+ [[https://github.com/oantolin/embark/][embark]]
+ [[https://github.com/oantolin/embark/][embark-consult]]
+ [[https://github.com/minad/marginalia][marginalia]]
+ [[https://github.com/oantolin/orderless][orderless]]
+ [[https://github.com/mhayashi1120/Emacs-wgrep][wgrep]]
+ [[https://github.com/minad/consult/][consult-flycheck]] (=:checkers syntax=)
+ [[https://github.com/iyefrat/all-the-icons-completion][all-the-icons-completion]] (=+icons=)

* Prerequisites
This module has no prerequisites.

* Features

The packages in this module modify and use the built-in ~completing-read~
function, which is used by any function that requires completion. Due to this
the full scope of these packages is too large to cover here and you are
encouraged to go and read their excellent documentation. We will detail
Doom-specific additions:

** Vertico keybindings
When in an active Vertico completion session, the following doom added
keybindings are available:

| Keybind               | Description                                        |
|-----------------------+----------------------------------------------------|
| =C-p=                 | Go to previous candidate                           |
| =C-n=                 | Go to next candidate                               |
| =C-k=                 | (evil) Go to previous candidate                    |
| =C-j=                 | (evil) Go to next candidate                        |
| =C-;= or =<leader> a= | Open an ~embark-act~ menu to chose a useful action |
| =C-c C-;=             | export the current candidate list to a buffer      |
| =C-SPC=               | Preview the current candidate                      |
| =C-M-k=               | (evil) Go to previous candidate and preview.       |
| =C-M-j=               | (evil) Go to next candidate and preview.           |

~embark-act~ will prompt you with a =which-key= menu with useful commands on the
selected candidate or candidate list, depending on the completion category. Note
that you can press =C-h= instead of choosing a command to filter through the
options with a Vertico buffer, that also has slightly more detailed descriptions
due to Marginalia annotations.

** Jump-to navigation
This module provides an interface to navigate within a project using
=projectile=:

https://assets.doomemacs.org/completion/vertico/projectile.png

| Keybind              | Description                         |
|----------------------+-------------------------------------|
| =SPC p f=, =SPC SPC= | Jump to file in project             |
| =SPC f f=, =SPC .=   | Jump to file from current directory |
| =SPC s i=            | Jump to symbol in file              |

** Project search & replace
This module provides interactive text search and replace using ripgrep.

| Keybind   | Description              |
|-----------+--------------------------|
| =SPC s p= | Search project           |
| =SPC s P= | Search another project   |
| =SPC s d= | Search this directory    |
| =SPC s D= | Search another directory |

https://assets.doomemacs.org/completion/vertico/search.png

Prefixing these keys with the universal argument (=SPC u= for evil users; =C-u=
otherwise) changes the behavior of these commands, instructing the underlying
search engine to include ignored files.

This module also provides Ex Commands for evil users:

| Ex command             | Description                                                      |
|------------------------+------------------------------------------------------------------|
| ~:pg[rep][!] [QUERY]~  | Search project (if ~!~, include hidden files)                    |
| ~:pg[rep]d[!] [QUERY]~ | Search from current directory (if ~!~, don't search recursively) |

The optional `!` is equivalent to the universal argument for the previous
commands.

-----

On top of the usual Vertico keybindings, search commands also offer support for
exporting the current candidate list to an editable buffer =C-c C-e=. After
editing the changes can be committed with =C-c C-c= and aborted with =C-c C-k=
(alternatively =ZZ= and =ZQ=, for evil users). It uses =wgrep= for grep
searches, =wdired= for file searches, and =occur= for buffer searches.

https://assets.doomemacs.org/completion/vertico/search-replace.png

** In-buffer searching
This module provides some in buffer searching bindings:

+ =SPC s s= (~isearch~)
+ =SPC s S= (~+vertico/search-symbol-at-point~ via ~consult-line~)
+ =SPC s b= (~consult-line~)

https://assets.doomemacs.org/completion/vertico/buffer-search.png

An ~occur-edit~ buffer can be opened from ~consult-line~ with =C-c C-e=.

** Vertico integration for various completing commands
*** General
| Keybind        | Description                 |
|----------------+-----------------------------|
| =M-x=, =SPC := | Enhanced M-x                |
| =SPC '=        | Resume last Vertico session |

*** Jump to files, buffers or projects
| Keybind              | Description                           |
|----------------------+---------------------------------------|
| =SPC RET=            | Find bookmark                         |
| =SPC f f=, =SPC .=   | Browse from current directory         |
| =SPC p f=, =SPC SPC= | Find file in project                  |
| =SPC f r=            | Find recently opened file             |
| =SPC p p=            | Open another project                  |
| =SPC b b=, =SPC ,=   | Switch to buffer in current workspace |
| =SPC b B=, =SPC <=   | Switch to buffer                      |

=SPC b b= and =SPC ,= support changing the workspace you're selecting a buffer from
via [[https://github.com/minad/consult#narrowing-and-grouping][Consult narrowing]], e.g. if you're on the first workspace, you can switch to
selecting a buffer from the third workspace by typing =3 SPC= into the prompt,
or the last workspace by typing =0 SPC=.

=SPC f f= and =SPC .= support exporting to a =wdired= buffer using =C-c C-e=.

*** Search
| Keybind   | Description                               |
|-----------+-------------------------------------------|
| =SPC p t= | List all TODO/FIXMEs in project           |
| =SPC s b= | Search the current buffer                 |
| =SPC s d= | Search this directory                     |
| =SPC s D= | Search another directory                  |
| =SPC s i= | Search for symbol in current buffer       |
| =SPC s p= | Search project                            |
| =SPC s P= | Search another project                    |
| =SPC s s= | Search the current buffer (incrementally) |

** Marginalia
| Keybind | Description                     |
|---------+---------------------------------|
| =M-A=   | Cycle between annotation levels |

** Orderless filtering
When using orderless to filter through candidates, the default behaviour is for
each space separated input to match the candidate as a regular expression or
literally.

Note that due to this style of matching, pressing tab does not expand the input
to the longest matching prefix (like shell completion), but rather uses the
first matched candidate as input. Filtering further is instead achieved by
pressing space and entering another input. In essence, when trying to match
=foobar.org=, instead of option 1., use option 2.:

1. (BAD) Enter =foo TAB=, completes to =foobar.=, enter =org RET=
2. (GOOD) Enter =foo SPC org RET=

Doom has some builtin [[https://github.com/oantolin/orderless#style-dispatchers][style dispatchers]] for more finegrained filtering, which
you can use to further specify each space separated input in the following ways:
| Input            | Description                                |
|------------------+--------------------------------------------|
| =!foo=           | match without literal input =foo=          |
| =`bar= or =bar`= | match input =bar= as an initialism         |
| ==baz= or =baz== | match only with literal input =baz=        |
| =~qux= or =qux~= | match input =qux= with fuzzy/flex matching |

* Configuration
If you want to further configure this module, here are some good places to start:

+ Vertico provides several [[https://github.com/minad/vertico#extensions][extentions]] that can be used to extend it's interface
+ You can add more Marginalia annotation levels and change the existing ones by
  editing ~marginalia-annotator-registry~
+ You can change the available commands in Embark for category ~$cat~ by editing
  ~embark-$cat-map~, and even add new categories. Note that you add categories
  by defining them [[https://github.com/minad/marginalia/#adding-custom-annotators-or-classifiers][through marginalia]], and embark picks up on them.