Posted onMay 16, 2022

Autocompletion for Neovim

One of the coolest features that can make you more productive with NeoVim is autocompletion, so we have some plugins to choose between them based on the performance

YouCompleteMe
Coc.nvim

these plugins are great to use but they are very heavy because of Javascript and Python, so I decided to switch to another solution
and the solution is Lua Plugin callednvim-cmp
with this plugin you can add an auto-completion to your neovim with minimal performance, all you have to do is download thelanguage server

Install

before installing the plugins you need to install Lua first

$sudopacman-S lua

and you need a Plugin manager you can choose between

vim-plug ( I use this )
Pathogen
Vundle

after installing the nvim-cmp plugin you have to install some external plugins

" ~/.config/nvim/init.nvim    Plug'hrsh7th/cmp-nvim-lsp'    Plug'hrsh7th/cmp-buffer'    Plug'hrsh7th/cmp-path'    Plug'hrsh7th/cmp-cmdline'    Plug'hrsh7th/nvim-cmp'    Plug'hrsh7th/vim-vsnip'

after installing the server of your language you may need some Lua code to enable it
so you can use this code to copy & paste into yourinit.nvim file
Also, Don't forget to checkthis page to get the right server for your language

in my case I'll installrust-analyzer

$sudopacman-S rust-analyzer

" ~/.config/nvim/init.nvimlua<<EOF-- Setup nvim-cmp.  localcmp= require'cmp'cmp.setup({    snippet={-- REQUIRED- you must specifya snippet engineexpand=function(args)vim.fn["vsnip#anonymous"](args.body)-- For `vsnip` users.-- require('luasnip').lsp_expand(args.body)-- For `luasnip` users.-- require('snippy').expand_snippet(args.body)-- For `snippy` users.--vim.fn["UltiSnips#Anon"](args.body)-- For `ultisnips` users.      end,},    mapping={['<C-b>']=cmp.mapping(cmp.mapping.scroll_docs(-4),{'i','c'}),['<C-f>']=cmp.mapping(cmp.mapping.scroll_docs(4),{'i','c'}),['<C-Space>']=cmp.mapping(cmp.mapping.complete(),{'i','c'}),['<C-y>']=cmp.config.disable,-- Specify `cmp.config.disable`if you wanttoremove the default `<C-y>` mapping.['<C-e>']=cmp.mapping({i=cmp.mapping.abort(),c=cmp.mapping.close(),}),['<CR>']=cmp.mapping.confirm({ select= true}),-- Accept currently selected item. Set `select`to `false`toonlyconfirm explicitly selecteditems.},    sources=cmp.config.sources({{ name='nvim_lsp'},{ name='vsnip'},-- For vsnip users.--{ name='luasnip'},-- For luasnip users.--{ name='ultisnips'},-- For ultisnips users.--{ name='snippy'},-- For snippy users.},{{ name='buffer'},})})-- Set configurationfor specificfiletype.cmp.setup.filetype('gitcommit',{    sources=cmp.config.sources({{ name='cmp_git'},-- You can specify the `cmp_git`sourceif you were installed it.},{{ name='buffer'},})})-- Usebuffersourcefor `/`(if you enabled `native_menu`, this won't work anymore).cmp.setup.cmdline('/',{    sources={{ name='buffer'}}})-- Use cmdline &pathsourcefor':'(if you enabled `native_menu`, this won't work anymore).cmp.setup.cmdline(':',{    sources=cmp.config.sources({{ name='path'}},{{ name='cmdline'}})})-- Setup lspconfig.  local capabilities= require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())-- Replace<YOUR_LSP_SERVER> with eachlsp server you've enabled.  require'lspconfig'.rust_analyzer.setup{      capabilities= capabilities,}EOF