Automate vim-plug installation

Author: gitetsu

vimrc

@@ -6,6 +6,12 @@ scriptencoding utf-8
 
 set nocompatible
 
+if empty(glob('~/.vim/autoload/plug.vim'))
+  silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs
+    \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
+  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
+endif
+
 " vim-plug
 call plug#begin('~/.vim/plugged')