Vim Plugin Howto: NERDTree

1. NERDTree
  a. ":NERDTree" to open NERD Tree in vim
  b. "Up" : to move up cursor
  c. "Down" : to move down cursor
  d. "Enter" : to open a directory
  e. "o": to open a file
  e. "H" :to show or hide hidden files
  f. "R" : Refresh the tree, useful if files change outside of Vim
  h. "m" : show the NERD Tree menu
  i. "?" : NERD Tree quick help
  j. ":q" : exit 



Refer to:
  https://medium.com/usevim/nerd-tree-guide-bb22c803dcd2



2. CScope

1. Run cscope

cscope -R -b

2. 

 Ctrl-]  : split horizontal pane (editing new buffer)

 Ctrl-w s or ":spit" : split horizontal pane (editing current buffer)

 Ctrl-w v or ":vsplit" : split vertical pane (editing current buffer)

Refer to:

  1. https://a0gustinus.wordpress.com/2013/06/01/browsing-source-code-in-linux-vimcscope/
  2. https://dougblack.io/words/a-good-vimrc.html