emacs

1. install NeoTree

(1) clone

  $ cd /some/path
  $ git clone https://github.com/jaypei/emacs-neotree.git neotree

(2) add this to .emacs

  (add-to-list 'load-path "/some/path/neotree")
  (require 'neotree)
  (global-set-key [f8] 'neotree-toggle)

(3) use