特定のファイルが読み込まれた時にauコマンドを発動する
au BufRead,BufNewFile /etc/apache2/sites-available/www.example.com set filetype=apache
参照
What exactly happens when you change a file type in vim? - Stack Overflow
au BufRead,BufNewFile /etc/apache2/sites-available/www.example.com set filetype=apache
What exactly happens when you change a file type in vim? - Stack Overflow