refactor(options): moved undo directory to cache path for persistent undos

lua/core/options.lua

@@ -21,7 +21,7 @@ local options = {
     inccommand = 'split', -- preview incremental substitute
     laststatus = 3,
     list = true,
-    -- listchars = { trail = '', tab = '', nbsp = '_', extends = '>', precedes = '<' }, -- highlight
+    listchars = { trail = '', tab = '', nbsp = '_', extends = '>', precedes = '<' }, -- highlight
     mouse = 'a', -- allow the mouse to be used in neovim
     number = true, -- set numbered lines
     numberwidth = 4, -- set number column width to 2 {default 4}
@@ -49,6 +49,7 @@ local options = {
     timeoutlen = 300, -- time to wait for a mapped sequence to complete (in milliseconds)
     title = true, -- window titles
     undofile = true, -- enable persistent undo
+    undodir = vim.fn.stdpath('cache') .. '/undo',
     undolevels = 10000,
     updatetime = 50, -- faster completion (4000ms default)
     wildmenu = true, -- wildmenu