feat: make nvimtree lazy

nvim/lua/config/autocmds.lua

@@ -10,3 +10,45 @@
 -- 		vim.cmd("set norelativenumber")
 -- 	end,
 -- })
+
+-- nvim-tree is also there in modified buffers so this function filter it out
+local modifiedBufs = function(bufs)
+  local t = 0
+  for k, v in pairs(bufs) do
+    if v.name:match("NvimTree_") == nil then
+      t = t + 1
+    end
+  end
+  return t
+end
+
+vim.api.nvim_create_autocmd("BufEnter", {
+  nested = true,
+  callback = function()
+    if #vim.api.nvim_list_wins() == 1 and
+        vim.api.nvim_buf_get_name(0):match("NvimTree_") ~= nil and
+        modifiedBufs(vim.fn.getbufinfo({ bufmodified = 1 })) == 0 then
+      vim.cmd "quit"
+    end
+  end
+})
+
+local function open_nvim_tree(data)
+
+  -- buffer is a directory
+  local directory = vim.fn.isdirectory(data.file) == 1
+
+  if not directory then
+    return
+  end
+
+  -- change to the directory
+  if directory then
+    vim.cmd.cd(data.file)
+  end
+
+  -- open the tree
+  require("nvim-tree.api").tree.open()
+end
+
+vim.api.nvim_create_autocmd({ "VimEnter" }, { callback = open_nvim_tree })