completion/company: rewrite README
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Henrik Lissner
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#+TITLE: :completion company
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#+TITLE: completion/company
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#+DATE: February 19, 2017
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#+SINCE: v2.0
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#+STARTUP: inlineimages
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This module adds code-completion support, powered by [[https://github.com/company-mode/company-mode][company]].
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* Table of Contents :TOC_3:noexport:
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- [[Description][Description]]
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- [[Module Flags][Module Flags]]
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- [[Plugins][Plugins]]
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- [[Prerequisites][Prerequisites]]
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- [[Features][Features]]
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- [[Code completion][Code completion]]
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- [[Vim-esque omni-completion prefix (C-x)][Vim-esque omni-completion prefix (C-x)]]
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- [[Configuration][Configuration]]
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- [[Enable as-you-type code completion][Enable as-you-type code completion]]
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- [[Enable company backend(s) in certain modes][Enable company backend(s) in certain modes]]
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- [[Troubleshooting][Troubleshooting]]
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- [[Code-completion doesn't pop up automatically.][Code-completion doesn't pop up automatically.]]
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- [[X-mode doesn't have code completion support or requires extra setup.][X-mode doesn't have code completion support or requires extra setup.]]
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- [[No backends (or the incorrect ones) have been registered for X-mode.][No backends (or the incorrect ones) have been registered for X-mode.]]
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+ Uses ~company-quickhelp~ for documentation tooltips
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+ Uses ~company-statistics~ to order results by usage frequency
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* Description
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This module provides code completion, powered by [[https://github.com/company-mode/company-mode][company-mode]]. It is required
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for code completion in many of Doom's :lang modules.
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[[/../screenshots/company.png]]
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https://assets.doomemacs.org/completion/company/overlay.png
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* Table of Contents :TOC:
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- [[#install][Install]]
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- [[#configure][Configure]]
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- [[#auto-completion][Auto-completion]]
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- [[#troubleshooting][Troubleshooting]]
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** Module Flags
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+ =+auto= Enables as-you-type completion.
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+ =+childframe= Enables displaying completion candidates in a child frame,
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rather than an overlay or tooltip (among with other UI enhancements). *This
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requires GUI Emacs 26.1+.*
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* Install
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Some languages require additional setup, and some languages may have no
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completion support at all.
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** Plugins
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+ [[https://github.com/company-mode/company-mode][company-mode]]
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+ [[https://github.com/hlissner/emacs-company-dict][company-dict]]
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+ [[https://github.com/raxod502/prescient.el][company-prescient]]
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+ [[https://github.com/sebastiencs/company-box][company-box]]
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Check the README.org in that language's module for details.
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* Prerequisites
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This module has no direct prerequisites.
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* Configure
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** Auto-completion
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By default, I've disabled auto-completion. This is my preference. I prefer to
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invoke company when I need it by calling ~company-complete~ manually (typically,
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bound to =C-SPC= in insert mode). However, some may not share my preference.
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However, some major modes may require additional setup for code completion to
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work in them. Some major modes may have no completion support at all. Check that
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major mode's module's documentation for details.
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To enable auto-completion you must:
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* Features
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** Code completion
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Ccompletion must be triggered manually with the =C-SPC= key. If you want
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as-you-type code completion, the ~+auto~ module flag will enable it.
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1. Load ~company~,
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2. and change ~company-idle-delay~ to a non-nil float (the default is 0.5)
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| Keybind | Description |
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|---------+------------------------------------------|
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| =C-SPC= | Invoke code completion manually |
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| =C-n= | Go to next candidate |
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| =C-p= | Go to previous candidate |
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| =C-j= | (evil) Go to next candidate |
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| =C-k= | (evil) Go to previous candidate |
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| =C-h= | Display documentation (if available) |
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| =C-u= | Move to previous page of candidates |
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| =C-d= | Move to next page of candidates |
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| =C-s= | Filter candidates |
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| =C-S-s= | Search candidates with helm/ivy |
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| =C-SPC= | Complete common |
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| =TAB= | Complete common or select next candidate |
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| =S-TAB= | Select previous candidate |
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For example:
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** Vim-esque omni-completion prefix (C-x)
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In the spirit of Vim's omni-completion, the following insert mode keybinds are
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available to evil users to access specific company backends:
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| Keybind | Description |
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|-----------+-----------------------------------|
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| =C-x C-]= | Complete etags |
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| =C-x C-f= | Complete file path |
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| =C-x C-k= | Complete from dictionary/keyword |
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| =C-x C-l= | Complete full line |
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| =C-x C-o= | Invoke complete-at-point function |
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| =C-x C-n= | Complete next symbol at point |
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| =C-x C-p= | Complete previous symbol at point |
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| =C-x C-s= | Complete snippet |
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| =C-x s= | Complete spelling suggestions |
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* Configuration
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** Enable as-you-type code completion
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The =+auto= module flag enables this. You may customize ~company-idle-delay~ to
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control how quickly the popup should appear.
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The ~+company/toggle-auto-completion~ command is also available to toggle this
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interactively.
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** Enable company backend(s) in certain modes
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The ~set-company-backend!~ function exists for setting ~company-backends~
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buffer-locally in MODES, which is either a major-mode symbol, a minor-mode
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symbol, or a list of either. BACKENDS are prepended to ~company-backends~ for
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those modes.
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#+BEGIN_SRC emacs-lisp
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(require 'company)
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(setq company-idle-delay 0.2
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company-minimum-prefix-length 3)
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(after! js2-mode
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(set-company-backend! 'js2-mode 'company-tide 'company-yasnippet))
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(after! sh-script
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(set-company-backend! 'sh-mode
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'(company-shell :with company-yasnippet)))
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(after! cc-mode
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(set-company-backend! 'c-mode
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'(:separate company-irony-c-headers company-irony)))
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#+END_SRC
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To unset the backends for a particular mode, pass ~nil~ to it:
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#+BEGIN_SRC emacs-lisp
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(after! sh-script
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(set-company-backend! 'sh-mode nil))
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#+END_SRC
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* Troubleshooting
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If completion isn't working for you, please consider the following before
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posting a bug report:
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If code completion isn't working for you, consider the following common causes
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before you file a bug report:
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+ If what you are expecting is popup-as-you-type completion (which is disabled
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by default), see the "Configure > Auto-completion" section above, which will
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instruct you on how to enable this.
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+ Some languages don't have any auto-completion support at all.
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** Code-completion doesn't pop up automatically.
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This is by design. The expectation is that you invoke completion manually with
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=C-SPC=. This was decided because code-completion backends can be slow, some
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dreadfully so, and invoking them every time you move your cursor can add pauses
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and delays while editing.
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If, despite that, you still want this functionality, use the =+auto= flag to
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enable it.
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** X-mode doesn't have code completion support or requires extra setup.
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There is no guarantee your language mode will have completion support.
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Some, like ~lua-mode~, don't have completion support in Emacs at all. Others may
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requires additional setup to get code completion working. For instance,
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~go-mode~ requires ~guru~ to be installed on your system, and ~enh-ruby-mode~
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requires that you have a Robe server running (~M-x robe-start~).
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Check the relevant module's documentation for this kind of information.
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** No backends (or the incorrect ones) have been registered for X-mode.
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Doom expects every mode to have an explicit list of company-backends (and as
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short a list as possible). This may mean you aren't getting all the completion
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you want or any at all.
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Check the value of ~company-backends~ (=SPC h v company-backends=) from that
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mode to see what backends are available. Check the [[*Assigning company backend(s) to modes][Configuration section]] for
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details on changing what backends are available for that mode.
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