Vim-EasyComplete

It's a Fast and Minimalism Style Completion Plugin for vim/nvim. There are many excellent vim auto-completion plugins such as nvim-cmp, vim-lsp, YouCompleteMe and coc.nvim etc. However I still want a simpler plugin without any redundant configurations. And it's a good idea to incorporate AI coding assistants as well.

What

Vim-easycomplete is a fast and minimalism style completion plugin for vim/nvim. It aims to be available out of the box on linux and mac. It is implemented in pure VimScript and is extremely simple to configure without installing Node and a bunch of Node modules.

vim-easycomplete.mov

It contains these features:

AI coding assistant via tabnine. (Highly Recommend!)
Buffer Keywords/Directory support
LSP(language-server-protocol) support. Easy to install LSP Server with one command
Written in pure vim script for vim8 and neovim
Snippet support
Fast performance

Installation

Easycomplete requires Vim 8.2 or higher version with MacOS/Linux/FreeBSD. For neovim users, 0.6.0 or higher is required.

Vimscript config with vim-plug:

Plug 'jayli/vim-easycomplete'
Plug 'SirVer/ultisnips'

Run :PlugInstall.

Lua config with Packer.nvim:

use { 'jayli/vim-easycomplete', requires = {'SirVer/ultisnips'}}

Run :PackerInstall

Full configuration example.

Commands

All commands:

Command	Description
`:EasyCompleteInstallServer`	Install LSP server for current fileytpe
`:InstallLspServer`	Same as `EasyCompleteInstallServer`
`:EasyCompleteDisable`	Disable EasyComplete
`:EasyCompleteEnable`	Enable EasyComplete
`:EasyCompleteGotoDefinition`	Goto definition position
`:EasyCompleteReference`	Find references
`:EasyCompleteRename`	Rename
`:EasyCompleteCheck`	Checking LSP server
`:EasyCompletePreviousDiagnostic`	Goto Previous diagnostic
`:EasyCompleteNextDiagnostic`	Goto Next diagnostic
`:EasyCompleteProfileStart`	Start record diagnostics message
`:EasyCompleteProfileStop`	Stop record diagnostics message
`:EasyCompleteLint`	Do diagnostic
`:LintEasyComplete`	Do diagnostic
`:BackToOriginalBuffer`	Return to the position before the reference jump
`:DenoCache`	Do Deno Cache for downloading modules
`:CleanLog`	close quickfix window

Configuration

The plugin is out of box and config nothing. (If you want full features, please refer to my full configuration). Use Tab to trigger the completion suggestions and select matched items. By default use Ctrl-] for definition jumping, Ctrl-t for jumping back (Same as tags jumping).

Lua configuration:

-- Highlight the symbol when holding the cursor if you need it
vim.g.easycomplete_cursor_word_hl = 1
-- Using nerdfont is highly recommended
vim.g.easycomplete_nerd_font = 1

-- GoTo code navigation
vim.keymap.set('n', 'gr', ':EasyCompleteReference<CR>')
vim.keymap.set('n', 'gd', ':EasyCompleteGotoDefinition<CR>')
vim.keymap.set('n', 'rn', ':EasyCompleteRename<CR>')
vim.keymap.set('n', 'gb', ':BackToOriginalBuffer<CR>')

Vimscript configuration:

" Highlight the symbol when holding the cursor
let g:easycomplete_cursor_word_hl = 1
" Using nerdfont is highly recommended
let g:easycomplete_nerd_font = 1

" GoTo code navigation
noremap gr :EasyCompleteReference<CR>
noremap gd :EasyCompleteGotoDefinition<CR>
noremap rn :EasyCompleteRename<CR>
noremap gb :BackToOriginalBuffer<CR>

Other optional configurations:

set updatetime=300 (lua: vim.opt.updatetime = 300) is highly recommended.
Menu noselected by default: setlocal completeopt+=noselect, (lua: vim.cmd('setlocal completeopt+=noselect'))

Global configurations:

Global Configure	Default	Description
`g:easycomplete_nerd_font`	0	Using nerdfont for lsp icons
`g:easycomplete_menu_skin`	`{}`	Menu skin.
`g:easycomplete_sign_text`	`{}`	Sign icons.
`g:easycomplete_lsp_type_font`	...	lsp icons configuration
`g:easycomplete_tabnine_suggestion`	1	Tabnine inline suggestion(for nvim only)
`g:easycomplete_lsp_checking`	1	Check whether the lsp is installed while opening a file
`g:easycomplete_tabnine_enable`	1	Enable Tabnine
`g:easycomplete_directory_enable`	1	Directory complete
`g:easycomplete_tabnine_config`	`{}`	TabNine Configuration
`g:easycomplete_filetypes`	`{}`	Custom filetyps configuration
`g:easycomplete_enable`	1	Enable this plugin
`g:easycomplete_tab_trigger`	`<Tab>`	Use tab to trigger completion and select next item
`g:easycomplete_shift_tab_trigger`	`<S-Tab>`	Use s-tab to select previous item
`g:easycomplete_cursor_word_hl`	0	Highlight the symbol when holding the cursor
`g:easycomplete_signature_offset`	0	Signature offset
`g:easycomplete_diagnostics_next`	`<C-N>`	Goto next diagnostic position
`g:easycomplete_diagnostics_prev`	`<S-C-n>`	Goto previous diagnostic position
`g:easycomplete_diagnostics_enable`	1	Enable diagnostics
`g:easycomplete_signature_enable`	1	Enable signature
`g:easycomplete_diagnostics_hover`	1	Gives a diagnostic prompt when the cursor holds
`g:easycomplete_pum_format`	`["abbr", "kind", "menu"]`	Pmenu format

Typing :h easycomplete for help.

Language Support

There are tow ways to install lsp server.

For vim/nvim: via integrated installer by :InstallLspServer.
For nvim only: via nvim-lsp-installer by :LspInstall

Plug 'williamboman/nvim-lsp-installer'

LSP Server will all be installed in ~/.config/vim-easycomplete/servers.

You can give a specified plugin name for InstallLspServer command. Both of the following useage are avilable:

:InstallLspServer
:InstallLspServer lua

All supported languages:

Plugin Name	Languages	Language Server	Installer	Requirements	nvim-lsp-installer support
directory	directory	No Need	Integrated	None	-
buf	buf & dict	No Need	Integrated	None	-
snips	Snippets	ultisnips	Integrated	python3	-
ts	js/ts	tsserver	Yes	node/npm	Yes
deno	js/ts	denols	Yes	deno	Yes
tn	TabNine	TabNine	Yes	None	No
vim	Vim	vimls	Yes	node/npm	Yes
cpp	C/C++/OC	clangd	Yes	None	Yes
css	CSS	cssls	Yes	node/npm	Yes
html	HTML	html	Yes	node/npm	Yes
yml	YAML	yamlls	Yes	node/npm	Yes
xml	Xml	lemminx	Yes	java/jdk	Yes
sh	Bash	bashls	Yes	node/npm	Yes
json	JSON	json-languageserver	Yes	node/npm	No
php	php	intelephense	Yes	node/npm	Yes
dart	dart	dartls	Yes	None	Yes
py	Python	pylsp	Yes	python3/pip3	Yes
java	Java	jdtls	Yes	java11/jdk	Yes
go	Go	gopls	Yes	go	Yes
r	R	r-languageserver	Yes	R	No
rb	Ruby	solargraph	Yes	ruby/bundle	No
lua	Lua	`sumneko_lua`	Yes	Lua	Yes
nim	Nim	nimls	Yes	nim/nimble	Yes
rust	Rust	`rust_analyzer`	Yes	None	Yes
kt	Kotlin	`kotlin_language_server`	Yes	java/jdk	Yes
grvy	Groovy	groovyls	Yes	java/jdk	Yes
cmake	cmake	cmake	Yes	python3/pip3	Yes
c#	C#	omnisharp-lsp	Yes	None	No

More info about semantic completion for each supported language:

JavaScript & TypeScript: tsserver required.
Python: There are 2 avilable python-language-server branches:
- pyls support python 3.5 ~ 3.10 (pyls breaks autocomplete on Python 3.11), pip3 install python-language-server
- pylsp work well with python 3.11, pip3 install python-lsp-server, (Recommend)
Go: gopls required. (go get golang.org/x/tools/gopls)
Vim Script: vimls required.
C++/C/OC：Clangd required.
CSS: cssls required. (css-languageserver)，Css-languageserver dose not support CompletionProvider by default as it requires Snippets，You must install it manually.
JSON: json-languageserver required.
PHP: intelephense
Dart: dartls
HTML: html required. html-languageserver dose not support CompletionProvider by default. You must install Snippets manually.
Shell: bashls required.
Java: jdtls, java 11 and upper version required.
Cmake: cmake required.
Kotlin: kotlin language server required.
Rust: rust-analyzer required.
Lua: sumneko lua required. Local configuration file path is ~/.config/vim-easycomplete/servers/lua/config.json. Get more information here.
Xml: lemminx required.
Groovy: groovyls required.
Yaml: yamlls required.
Ruby: solargraph required.
Nim: nimlsp required. packages.json downloading is very slow, You'd better intall minlsp manually via choosenim follow this guide.
Deno: denols required. Use :DenoCache command for deno cache current ts/js file.
C# : omnisharp required.
R: r-languageserver required.
TabNine: TabNine

Add filetypes whitelist for specified language plugin:

let g:easycomplete_filetypes = {
      \   "sh": {
      \     "whitelist": ["shell"]
      \   },
      \   "r": {
      \     "whitelist": ["rmd", "rmarkdown"]
      \   },
      \ }

Snippet Support

Vim-EasyComplete does not support snippets by default. If you want snippet integration, you will first have to install ultisnips. UltiSnips is compatible with Vim-EasyComplete out of the box. UltiSnips required python3 installed.

Solution of "E319: No python3 provider found" Error in neovim 0.4.4 with ultisnips

AI Coding via TabNine Support

Install TabNine: :InstallLspServer tabnine. Then restart your vim/nvim.

Set let g:easycomplete_tabnine_enable = 0 to disable TabNine. You can config TabNine by g:easycomplete_tabnine_config witch contains two properties:

line_limit: The number of lines before and after the cursor to send to TabNine. If the option is smaller, the performance may be improved. (default: 1000)
max_num_result: Max results from TabNine. (default: 3)

let g:easycomplete_tabnine_config = {
    \ 'line_limit': 1000,
    \ 'max_num_result' : 3,
    \ }

TabNine works well without APIKey. If you have a Tabnine's Pro API key or purchased a subscription license. To configure, you'll need to use the TabNine' magic string. Type Tabnine::config in insert mode to open the configuration panel.

Disable TabNine inline suggestion: let g:easycomplete_tabnine_suggestion = 0.

Beautify completion menu

Set g:easycomplete_nerd_font = 1 to enable default nerdfonts configuration.

If you want to customize the kind icon, you can modify the configuration with https://nerdfonts.com installed. Examples.

You can add custom Pmenu styles by defining these highlight groups:

EasyFuzzyMatch: highlight fuzzy matching character. It links to "Constant" by default if it's not defined.
EasyPmenu: Pmenu style. It links to "Pmenu" by default.
EasyPmenuKind: PmenuKind style. It links to "PmenuKind" by default.
EasyPmenuExtra: PmenuExtra style. It links to "PmenuExtra" by default.
EasyFunction: Function kind icon style. links to "Conditional" by default.
EasySnippet: Snippet kind icon style. links to "Number" by default.
EasyTabNine: TabNine kind icon style. links to "Character" by default.
EasySnippets: TabNine snippets suggestion style. links to "LineNr" by default