neovim: add undotree

neovim/.config/nvim/after/plugin/options.lua

@@ -44,3 +44,6 @@ opt.showmode = false
 opt.redrawtime = 4000
 opt.list = true
 opt.listchars = { multispace = "·", tab = ">~" }
+
+opt.undodir = os.getenv("HOME") .. "/.vim/undodir"
+opt.undofile = true

neovim/.config/nvim/after/plugin/remaps.lua

@@ -121,3 +121,11 @@ vim.keymap.set("i", "<C-l>", next_choice, { noremap = true, silent = true })
 vim.keymap.set("s", "<C-l>", next_choice, { noremap = true, silent = true })
 vim.keymap.set("i", "<C-h>", prev_choice, { noremap = true, silent = true })
 vim.keymap.set("s", "<C-h>", prev_choice, { noremap = true, silent = true })
+
+-- Undotree
+vim.keymap.set("n", "<leader>u", function()
+  vim.cmd([[
+    UndotreeToggle
+    UndotreeFocus
+  ]])
+end)