ebe4c60264
This reverts commit 29c78ce841 and all other fixes
that have been made afterwards.
The motivation is that use-package is seen by many as a replacement for
`require`. Is use-package always defer the loading of packages then is breaks
this use case, this does not respect POLA so even if it was making Spacemacs
loading faster (up to 3s faster on some startup on my machine) we just cannot
use it, it would be irresponsible. Spacemacs should be easy to use, loading
performance will come with time but it is not a priority.
257 lines
11 KiB
Org Mode
257 lines
11 KiB
Org Mode
#+TITLE: Auto-completion layer
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* Table of Contents :TOC_4_gh:noexport:
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- [[#description][Description]]
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- [[#features][Features:]]
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- [[#install][Install]]
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- [[#configuration][Configuration]]
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- [[#key-bindings][Key bindings]]
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- [[#snippets-directories][Snippets directories]]
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- [[#show-snippets-in-auto-completion-popup][Show snippets in auto-completion popup]]
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- [[#tooltips][Tooltips]]
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- [[#sort-results-by-usage][Sort results by usage]]
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- [[#enable-company-or-auto-complete-globally][Enable company or auto-complete globally]]
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- [[#replacing-company-by-auto-complete][Replacing company by auto-complete]]
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- [[#add-auto-completion-in-a-layer][Add auto-completion in a layer]]
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- [[#completion-back-ends][Completion back ends]]
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- [[#improved-faces][Improved faces]]
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- [[#key-bindings-1][Key Bindings]]
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- [[#company][Company]]
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- [[#auto-complete][Auto-complete]]
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- [[#yasnippet][Yasnippet]]
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- [[#auto-yasnippet][Auto-yasnippet]]
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* Description
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This layer provides auto-completion to Spacemacs.
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The following completion engines are supported:
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- [[http://company-mode.github.io/][company]]
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- [[https://github.com/auto-complete/auto-complete][auto-complete]]
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Snippets are supported via [[https://github.com/capitaomorte/yasnippet][yasnippet]] and [[https://github.com/abo-abo/auto-yasnippet][auto-yasnippet]].
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This layer also configures =hippie-expand=.
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** Features:
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- Completion with =company= or =auto-complete=
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- Frequency-based suggestions via =company-statistics=
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- Integration with =yasnippets=
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* Install
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To use this configuration layer, add it to your =~/.spacemacs=. You will need to
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add =auto-completion= to the existing =dotspacemacs-configuration-layers= list in this
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file.
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* Configuration
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** Key bindings
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You can customize the user experience of auto-completion with the following
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layer variables:
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1. =auto-completion-return-key-behavior= set the action to perform when the
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~RET~ key is pressed, the possible values are:
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- =complete= completes with the current selection
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- =nil= does nothing
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2. =auto-completion-tab-key-behavior= set the action to perform when the ~TAB~
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key is pressed, the possible values are:
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- =complete= completes with the current selection
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- =cycle= completes the common prefix and cycle between candidates
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- =nil= does nothing
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3. =auto-completion-complete-with-key-sequence= is a string of two characters
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denoting a key sequence that will perform a =complete= action if the sequence
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as been entered quickly enough. If its value is =nil= then the feature is
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disabled.
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4. =auto-completion-complete-with-key-sequence-delay= is the number of seconds
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to wait for the auto-completion key sequence to be entered. The default value
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is 0.1 seconds.
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5. =auto-completion-idle-delay= is the number of seconds to wait before
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suggesting completions. The default value is 0.2 seconds.
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The default configuration of the layer is:
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers '(
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(auto-completion :variables
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auto-completion-return-key-behavior 'complete
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auto-completion-tab-key-behavior 'cycle
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auto-completion-complete-with-key-sequence nil
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auto-completion-complete-with-key-sequence-delay 0.1
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auto-completion-idle-delay 0.2
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auto-completion-private-snippets-directory nil)
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))
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#+END_SRC
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~jk~ is a good candidate for =auto-completion-complete-with-key-sequence= if
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you don't use it already.
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** Snippets directories
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The following directories are added by default:
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- =~/.emacs.d/elpa/yasnippet-xxxxx/snippets=
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- =~/.emacs.d/layers/auto-completion/snippets=
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- =~/.emacs.d/private/snippets= (conditional to the value of =auto-completion-private-snippets-directory=)
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- =~/.spacemacs.d/snippets= (conditional to the existence of =~/.spacemacs.d= directory)
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You can provide additional directories by setting the variable
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=auto-completion-private-snippets-directory= which can take a string in case of
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a single path or a list of paths.
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If its value is =nil= then the path =~/.emacs.d/private/snippets= is used.
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** Show snippets in auto-completion popup
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By default, snippets are not shown in the auto-completion popup. To show them in
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the popup, set the variable =auto-completion-enable-snippets-in-popup= to =t=.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((auto-completion :variables
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auto-completion-enable-snippets-in-popup t)))
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#+END_SRC
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** Tooltips
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To enable automatic docstring tooltips set =auto-completion-enable-help-tooltip=
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to =t=.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((auto-completion :variables
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auto-completion-enable-help-tooltip t)))
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#+END_SRC
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To enable manual non-automatic invocation of docstring tooltips, set it to
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=manual=. The tooltip can be invoked manually by pressing ~M-h~.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((auto-completion :variables
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auto-completion-enable-help-tooltip 'manual)))
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#+END_SRC
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** Sort results by usage
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To enable sorting auto-completion results by their usage frequency set
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=auto-completion-enable-sort-by-usage= to =t=.
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This feature is provided by the [[https://github.com/company-mode/company-statistics][company-statistics]] package when =company=
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is used.
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The variable has no effect when =auto-complete= is used.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((auto-completion :variables
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auto-completion-enable-sort-by-usage t)))
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#+END_SRC
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** Enable company or auto-complete globally
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By default Spacemacs enables auto-completion explicitly for each supported
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major-mode, it means that =company= and =auto-complete= are not enabled
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globally, it allows more flexibility to choose an auto-completion engine
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for a given mode.
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You may want to enable company globally to get auto-completion
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everywhere even in the modes which are not configured by Spacemacs. To do
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so, you just have to add =(global-company-mode)= in the
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=dotspacemacs/user-config= function of your dotfile.
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Note that if you want to enable =auto-complete= globally you will have to
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disable =company= first, see the next section to do so.
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** Replacing company by auto-complete
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You can disable =company= by adding it to the =dotspacemacs-excluded-packages=
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variable, then you are free to enable =auto-complete= globally.
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** Add auto-completion in a layer
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Here is an example to add =company= auto-completion to python buffers via the
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package =company-anaconda=.
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In the file =packages.el= of the python layer:
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#+BEGIN_SRC emacs-lisp
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;; Add the relevant packages to the layer
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;; here it is `company-anaconda'
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(setq python-packages
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'(...
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(company-anaconda :toggle (configuration-layer/package-used-p 'company))
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...))
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(defun python/init-company-anaconda ()
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(use-package company-anaconda
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:defer t
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:init
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(spacemacs|add-company-backends
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:backends company-anaconda
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:modes python-mode)))
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#+END_SRC
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** Completion back ends
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Many spacemacs layers (e.g., python, html, haskell) configure company mode
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backends to provide mode-specific completion. These modes will include
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completion backends specified in the `spacemacs-default-company-backends`
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variable. The defaults should work well, but you can configure this variable in
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your =.spacemacs= file with (e.g.)
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#+BEGIN_SRC emacs-lisp
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(setq-default
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dotspacemacs-configuration-layers
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'((auto-completion :variables
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spacemacs-default-company-backends '(company-files company-capf))))
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#+END_SRC
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** Improved faces
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For nicer-looking faces, try adding the following to `custom-set-faces` in your dotspacemacs file.
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#+BEGIN_SRC emacs-lisp
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(custom-set-faces
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'(company-tooltip-common
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((t (:inherit company-tooltip :weight bold :underline nil))))
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'(company-tooltip-common-selection
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((t (:inherit company-tooltip-selection :weight bold :underline nil)))))
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#+END_SRC
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* Key Bindings
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** Company
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| Key Binding | Description |
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|-------------+------------------------------------------------------------------------------------------------------|
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| ~C-d~ | open minibuffer with documentation of thing at point in company dropdown |
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| ~C-/~ | show candidates in Helm (for fuzzy searching) |
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| ~C-M-/~ | filter the company dropdown menu |
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| ~M-h~ | show current candidate's documentation in a tooltip (requires =auto-completion-enable-help-tooltip=) |
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Vim Style:
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| Key Binding | Description |
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|-------------+----------------------------------------------|
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| ~C-j~ | (vim style) go down in company dropdown menu |
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| ~C-k~ | (vim style) go up in company dropdown menu |
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| ~C-l~ | (vim style) complete selection |
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Emacs style:
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| Key Binding | Description |
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|-------------+------------------------------------------------|
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| ~C-n~ | (emacs style) go down in company dropdown menu |
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| ~C-p~ | (emacs style) go up in company dropdown menu |
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** Auto-complete
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| Key Binding | Description |
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|-------------+----------------------------------------------------------------------|
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| ~C-j~ | select next candidate |
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| ~C-k~ | select previous candidate |
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| ~TAB~ | expand selection or select next candidate |
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| ~S-TAB~ | select previous candidate |
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| ~RET~ | complete word, if word is already completed insert a carriage return |
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** Yasnippet
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| Key Binding | Description |
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|-------------+----------------------------------------------------------------|
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| ~M-/~ | Expand a snippet if text before point is a prefix of a snippet |
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| ~SPC i s~ | List all current yasnippets for inserting |
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** Auto-yasnippet
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| Key Binding | Description |
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|-------------+---------------------------------------------------------------------------|
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| ~SPC i S c~ | create a snippet from an active region |
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| ~SPC i S e~ | Expand the snippet just created with ~SPC i y~ |
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| ~SPC i S w~ | Write the snippet inside =private/snippets= directory for future sessions |
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