diff --git a/lua/autocmd.lua b/lua/autocmd.lua
index de2f54d..97d252b 100644
--- a/lua/autocmd.lua
+++ b/lua/autocmd.lua
@@ -13,8 +13,11 @@ autocmd("VimLeave", {
 	command = "set guicursor=a:ver25-Cursor"
 })
 
-autocmd({ "CursorHold" }, {
-	callback = function()
-		vim.diagnostic.open_float(nil, { focus = false })
-	end
+autocmd("BufWritePre", {
+  callback = function()
+    local ok = pcall(function()
+      vim.cmd "undojoin"
+    end)
+    vim.cmd "Neoformat"
+  end,
 })
diff --git a/lua/config/TID.lua b/lua/config/TID.lua
new file mode 100644
index 0000000..f10bf72
--- /dev/null
+++ b/lua/config/TID.lua
@@ -0,0 +1 @@
+require("tiny-inline-diagnostic").setup({})
diff --git a/lua/config/actions-preview.lua b/lua/config/actions-preview.lua
new file mode 100644
index 0000000..fae87d1
--- /dev/null
+++ b/lua/config/actions-preview.lua
@@ -0,0 +1,73 @@
+require("actions-preview").setup {
+	-- options for vim.diff(): https://neovim.io/doc/user/lua.html#vim.diff()
+	diff = {
+		ctxlen = 3,
+	},
+
+	highlight_command = {
+		-- require("actions-preview.highlight").delta(),
+		-- require("actions-preview.highlight").diff_so_fancy(),
+		-- require("actions-preview.highlight").diff_highlight(),
+	},
+
+	-- priority list of preferred backend
+	backend = { "snacks", "nui" },
+
+	-- options related to telescope.nvim
+	telescope = vim.tbl_extend(
+		"force",
+		require("telescope.themes").get_dropdown(),
+		-- a table for customizing content
+		{
+			-- a function to make a table containing the values to be displayed.
+			-- fun(action: Action): { title: string, client_name: string|nil }
+			make_value = nil,
+
+			-- a function to make a function to be used in `display` of a entry.
+			-- see also `:h telescope.make_entry` and `:h telescope.pickers.entry_display`.
+			-- fun(values: { index: integer, action: Action, title: string, client_name: string }[]): function
+			make_make_display = nil,
+		}
+	),
+
+	-- options for nui.nvim components
+	nui = {
+		-- component direction. "col" or "row"
+		dir = "col",
+		-- keymap for selection component: https://github.com/MunifTanjim/nui.nvim/tree/main/lua/nui/menu#keymap
+		keymap = nil,
+		-- options for nui Layout component: https://github.com/MunifTanjim/nui.nvim/tree/main/lua/nui/layout
+		layout = {
+			position = "50%",
+			size = {
+				width = "60%",
+				height = "100%",
+			},
+			min_width = 40,
+			min_height = 10,
+			relative = "editor",
+		},
+		-- options for preview area: https://github.com/MunifTanjim/nui.nvim/tree/main/lua/nui/popup
+		preview = {
+			size = "80%",
+			border = {
+				style = "rounded",
+				padding = { 0, 1 },
+			},
+		},
+		-- options for selection area: https://github.com/MunifTanjim/nui.nvim/tree/main/lua/nui/menu
+		select = {
+			size = "20%",
+			border = {
+				style = "rounded",
+				padding = { 0, 1 },
+			},
+		},
+	},
+
+	--- options for snacks picker
+	---@type snacks.picker.Config
+	snacks = {
+		layout = { rpreset = "default" },
+	},
+}
diff --git a/lua/mappings.lua b/lua/mappings.lua
index 7f5a36e..98307fa 100644
--- a/lua/mappings.lua
+++ b/lua/mappings.lua
@@ -3,6 +3,8 @@ local map = vim.keymap.set
 map("n", "<Tab>", "<Cmd>BufferLineCycleNext<CR>")
 map("n", "<S-Tab>", "<Cmd>BufferLineCyclePrev<CR>")
 
+map({"n", "v"}, "<leader>ap", require("actions-preview").code_actions)
+
 map("n", ";", ":", { desc = "CMD enter command mode" })
 
 -- Move selected text up
diff --git a/lua/plugins/init.lua b/lua/plugins/init.lua
index 220f52f..24e260b 100644
--- a/lua/plugins/init.lua
+++ b/lua/plugins/init.lua
@@ -280,4 +280,22 @@ return {
 			require("config.tmux")
 		end,
 	},
+	{
+		"rachartier/tiny-inline-diagnostic.nvim",
+		config = function ()
+			require("config.TID")
+		end,
+	},
+	{
+		"aznhe21/actions-preview.nvim",
+		config = function()
+			require("config.actions-preview")
+		end,
+	},
+	{
+		"sbdchd/neoformat",
+		-- config = function()
+		-- 	require("config.neoformat")
+		-- end,
+	},
 }