nvim/lua/plugins/metals.lua

return {
	'scalameta/nvim-metals',
	dependencies = {
		'nvim-lua/plenary.nvim',
		'mfussenegger/nvim-dap',
		"hrsh7th/cmp-nvim-lsp",
	},
	ft = { 'scala', 'sbt' },
	config = function()
		local metals_config = require('metals').bare_config()
		metals_config.init_options.statusBarProvider = "on"
		metals_config.settings = {
			showImplicitArguments = true,
			superMethodLensesEnabled = true,
		}
		metals_config.on_attach = function(client, bufnr)
			require("metals").setup_dap()
			require("my_lsp").on_attach(client, bufnr)
		end
		metals_config.capabilities = require("cmp_nvim_lsp").default_capabilities()
		-- Debug settings if you're using nvim-dap
		local dap = require("dap")
		dap.configurations.scala = {
			{
				type = "scala",
				request = "launch",
				name = "RunOrTest",
				metals = {
					runType = "runOrTestFile",
					--args = { "firstArg", "secondArg", "thirdArg" }, -- here just as an example
				},
			},
			{
				type = "scala",
				request = "launch",
				name = "Test Target",
				metals = {
					runType = "testTarget",
				},
			},
		}


		-- Autocmd that will actually be in charging of starting the whole thing
		local nvim_metals_group = vim.api.nvim_create_augroup("nvim-metals", { clear = true })
		vim.api.nvim_create_autocmd("FileType", {
			-- NOTE: You may or may not want java included here. You will need it if you
			-- want basic Java support but it may also conflict if you are using
			-- something like nvim-jdtls which also works on a java filetype autocmd.
			pattern = { "scala", "sbt" },
			callback = function()
				require("metals").initialize_or_attach(metals_config)
			end,
			group = nvim_metals_group,
		})

		return metals_config
	end
}