vimrc読書会 http://vim-jp.org/reading-vimrc/
@username
11 | let s:vimrc_path = fnamemodify(resolve(expand('<sfile>:p')), ':h')
$MYVIMRC
has('win64')
has('win32')
3 | let s:is_windows = has("win32") || has("win64")
3 | let s:is_windows = has("win32") || has("win64") 4 | let s:is_cygwin = has('win32unix') 5 | let s:is_macvim = has('gui_macvim')