coala is a simple static code analysis program that is completely modular.
This is a vim/gvim extension for coala.
Simply save your file after loading it and you'll have coala running automatically and giving you the output in a popup.
This plugin is rather young. It is usable but beware of bugs! We'd love to hear from you, especially if any issues do occur!
Just run
cp plugin/* ~/.vim/plugin/
and enjoy vim showing you results on save!