Brought cmp back untile nvim 0.10 and mini.snippet

after/plugin/lsp.lua

@@ -56,31 +56,65 @@ vim.api.nvim_create_autocmd("LspAttach", {
 	end,
 })
 
+local lsp_capabilities = require("cmp_nvim_lsp").default_capabilities()
+
+local default_setup = function(server)
+	require("lspconfig")[server].setup({
+		capabilities = lsp_capabilities,
+	})
+end
+
 -- setup mason and automatically install some language server's
 require("mason").setup({})
 require("mason-lspconfig").setup({
 	ensure_installed = { "lua_ls", "jsonls", "bashls", "pyright", "marksman", "gopls", "clangd" },
-})
-
--- automatically setup already installed lsp's
-require("mason-lspconfig").setup_handlers({
-	function(server_name)
-		require("lspconfig")[server_name].setup({})
-	end,
+	handlers = { default_setup },
 })
 
 -- setup haskell language server manually cause it doesn't work with mason for xmonad
-require("lspconfig").hls.setup({})
+require("lspconfig").hls.setup({ capabilities = lsp_capabilities })
 
--- autocompletion using mini.completion
-require("mini.completion").setup({
-	lsp_completion = {
-		source_func = "omnifunc",
-		auto_setup = false,
+-- simple completion setup with snippet support
+local cmp = require("cmp")
+
+cmp.setup({
+	sources = {
+		{ name = "nvim_lsp" },
+		{ name = "snippy" },
+		{ name = "path" },
 	},
-	fallback_action = "<C-x><C-n>",
+	mapping = cmp.mapping.preset.insert({
+		["<C-l>"] = cmp.mapping.confirm({ select = false }),
+		["<C-j>"] = cmp.mapping(function(fallback)
+			if cmp.visible then
+				cmp.select_next_item()
+			else
+				fallback()
+			end
+		end, { "i", "s" }),
+		["<C-k>"] = cmp.mapping(function(fallback)
+			if cmp.visible then
+				cmp.select_prev_item()
+			else
+				fallback()
+			end
+		end, { "i", "s" }),
+	}),
+	snippet = {
+		expand = function(args)
+			require("snippy").expand_snippet(args.body)
+		end,
+	},
+	formatting = {
+		format = require("lspkind").cmp_format({
+			mode = "symbol_text", -- show only symbol annotations
+			maxwidth = 50, -- prevent the popup from showing more than provided characters
+			ellipsis_char = "...", -- when popup menu exceed maxwidth, the truncated part would show ellipsis_char instead
+		}),
+	},
+	enabled = function()
+		-- disable completion in comments
+		local context = require("cmp.config.context")
+		return not context.in_treesitter_capture("comment") and not context.in_syntax_group("Comment")
+	end,
 })
-
--- bind ctrl j and k to move beetwen completion items
-vim.keymap.set("i", "<C-j>", [[pumvisible() ? "\<C-n>" : "\<C-j>"]], { expr = true })
-vim.keymap.set("i", "<C-k>", [[pumvisible() ? "\<C-p>" : "\<C-k>"]], { expr = true })