From 39ddcf0b7deadb9f7863a3af12218d440fac3113 Mon Sep 17 00:00:00 2001
From: Fabio Lenherr / DashieTM <fabio.lenherr@gmail.com>
Date: Thu, 6 Apr 2023 00:07:43 +0200
Subject: [PATCH] feat: make nvimtree lazy

---
 nvim/lua/config/autocmds.lua  | 42 +++++++++++++++++++++++++++++++++++
 nvim/lua/plugins/nvimtree.lua |  2 +-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/nvim/lua/config/autocmds.lua b/nvim/lua/config/autocmds.lua
index 9093a0c..b8e9cc3 100644
--- a/nvim/lua/config/autocmds.lua
+++ b/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 })
diff --git a/nvim/lua/plugins/nvimtree.lua b/nvim/lua/plugins/nvimtree.lua
index 85c1da4..e1134bb 100644
--- a/nvim/lua/plugins/nvimtree.lua
+++ b/nvim/lua/plugins/nvimtree.lua
@@ -1,6 +1,7 @@
 return {
   {
     "nvim-tree/nvim-tree.lua",
+    lazy = true,
     opts = {
       on_attach = function(bufnr)
         local api = require("nvim-tree.api")
@@ -61,7 +62,6 @@ return {
         vim.keymap.set("n", "<2-RightMouse>", api.tree.change_root_to_node, opts("CD"))
       end,
       respect_buf_cwd = true,
-      open_on_setup = true,
       view = {
         centralize_selection = false,
         side = "right",