nerdtree.vim

" default mappings for nerdtree
nnoremap <leader>n :NERDTreeFocus<CR>
nnoremap <C-n> :NERDTree<CR>
nnoremap <C-t> :NERDTreeToggle<CR>
nnoremap <C-f> :NERDTreeFind<CR>

" also map with Leader, since ctrl is hard to reach on Mac
nnoremap <leader>t :NERDTreeToggle<CR>
nnoremap <leader>f :NERDTreeFind<CR>

" show hidden files
let NERDTreeShowHidden=1

" keep ignoring .git, node_modules, vendor, and dist
let NERDTreeIgnore=["\.git/", "node_modules/", "vendor/", "dist/"]

" Start NERDTree when Vim is started without file arguments.
autocmd StdinReadPre * let s:std_in=1
autocmd VimEnter * if argc() == 0 && !exists('s:std_in') | NERDTree | endif

" Exit Vim if NERDTree is the only window left.
autocmd BufEnter * if tabpagenr('$') == 1 && winnr('$') == 1 && exists('b:NERDTree') && b:NERDTree.isTabTree() |
    \ quit | endif

" if you want to change the default arrows
"let g:NERDTreeDirArrowExpandable = '▸'
"let g:NERDTreeDirArrowCollapsible = '▾'