nvim-config/lua/configs/null-ls.lua

local M = {}

function M.config()
	local status_ok, null_ls = pcall(require, 'null-ls')
	if not status_ok then
		return
	end

	local augroup = vim.api.nvim_create_augroup('LspFormatting', {})
	null_ls.setup({
		debug = false,
		sources = {
			-- https://github.com/jose-elias-alvarez/null-ls.nvim/blob/main/doc/BUILTINS.md

			-- Lua

			-- sudo pacman -S stylua
			-- https://github.com/JohnnyMorganz/StyLua/releases
			null_ls.builtins.formatting.stylua,

			-- Python

			-- pip install black
			null_ls.builtins.formatting.black,

			-- pip install isort
			null_ls.builtins.formatting.isort,

			-- JavaScript / TypeScript

			-- sudo pacman -S prettierd
			-- sudo npm install -g @fsouza/prettierd
			null_ls.builtins.formatting.prettierd.with({
				disabled_filetypes = { 'html', 'markdown' },
				condition = function(utils)
					return utils.root_has_file({ '.prettierrc.yml' })
				end,
			}),

			-- sudo pacman -S eslint_d
			-- sudo npm install -g eslint_d
			null_ls.builtins.diagnostics.eslint_d.with({
				diagnostic_config = {
					virtual_text = false,
					severity_sort = true,
				},
				condition = function(utils)
					return utils.root_has_file({ '.eslintrc.js' })
				end,
			}),
		},
		-- Format before save
		on_attach = function(client, bufnr)
			if client.supports_method('textDocument/formatting') then
				vim.api.nvim_clear_autocmds({ group = augroup, buffer = bufnr })
				vim.api.nvim_create_autocmd('BufWritePre', {
					group = augroup,
					buffer = bufnr,
					callback = function()
						vim.lsp.buf.format({ bufnr = bufnr })
					end,
				})
			end
		end,
	})
end

return M