III. LSP

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LSP is quite a bit more complicated than TreeSitter. We've got quite a bit of plugins this time around, add all of these (!):

" LSP Support
Plug 'neovim/nvim-lspconfig'               
Plug 'williamboman/mason-lspconfig.nvim'
Plug 'VonHeikemen/lsp-zero.nvim', {'branch': 'v1.x'}
Plug 'L3MON4D3/LuaSnip'             
Plug 'rafamadriz/friendly-snippets'
" Autocompletion Engine
Plug 'hrsh7th/nvim-cmp'         
Plug 'hrsh7th/cmp-nvim-lsp'    
Plug 'hrsh7th/cmp-buffer'      
Plug 'hrsh7th/cmp-path'        
Plug 'saadparwaiz1/cmp_luasnip'
Plug 'hrsh7th/cmp-nvim-lua'   

Full configuration so far

call plug#begin()
" Put all your `Plug <x>/<y>` statements here!
" Let's add Mason for LSP
Plug 'williamboman/mason.nvim' 
" and TreeSitter for highlighting
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
" LSP Support
Plug 'neovim/nvim-lspconfig'

Plug 'williamboman/mason-lspconfig.nvim'
Plug 'VonHeikemen/lsp-zero.nvim', {'branch': 'v1.x'}
" Snippets/examples for LSP
Plug 'L3MON4D3/LuaSnip'

Plug 'rafamadriz/friendly-snippets'
" Autocompletion Engine
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-path'
Plug 'saadparwaiz1/cmp_luasnip'
Plug 'hrsh7th/cmp-nvim-lua'
call plug#end()
" Put all your lua require('<xyz>') statements here! Make sure to include the following too:
lua require('init')

Then, run :PlugInstall as per usual to install all of these. Now, there's a lot to add. Most of this is ripped straight from ThePrimeagen's lsp.lua file, but who cares, really? Anyways, just append the following to init.lua:

local lsp = require('lsp-zero')
lsp.preset('recommended')
lsp.configure('lua-language-server', {
    settings = {
        Lua = {
            diagnostics = {
                globals = { 'vim' }
            }
        }
    }
})
lsp.nvim_workspace()

lsp.setup()

Optionally, if you want error messages displayed inline while you write code, add:

vim.diagnostic.config({
    update_in_insert = true,
    virtual_text = true
})

after the aforementioned block.

Full `init.lua` config (with inline errors)

require("mason").setup()
local lsp = require('lsp-zero')
lsp.preset('recommended')
lsp.configure('lua-language-server', {
    settings = {
        Lua = {
            diagnostics = {
                globals = { 'vim' }
            }
        }
    }
})
lsp.nvim_workspace()
lsp.setup()
vim.diagnostic.config({
    update_in_insert = true,
    virtual_text = true
})

* COPY AND PASTING THE ABOVE CODE PROBABLY WON'T WORK! REPLACE THE SPACES WITH TABS! (It has to do with how I formatted each tab with 4 emsps (which is disgustingly jank) but whatever)

Alright, LSP should be set up now. All we gotta do is run :Mason in Neovim and install whatever LSP servers you want (with the i keybind, or X to uninstall).