Improve nerdtree config

init.vim

@@ -18,6 +18,7 @@ source jsonnet.vim
 source racer.vim
 source lsp.vim
 source autoformat.vim
+source nerdtree.vim
 exec "cd " . oldwd
 
 " set up a line number on the current line but relative above and below to help

nerdtree.vim

@@ -0,0 +1,5 @@
+" from https://medium.com/@victormours/a-better-nerdtree-setup-3d3921abc0b9
+autocmd bufenter * if (winnr(“$”) == 1 && exists(“b:NERDTreeType”) && b:NERDTreeType == “primary”) | q | endif
+let NERDTreeAutoDeleteBuffer = 1
+let NERDTreeMinimalUI = 1
+let NERDTreeDirArrows = 1