Powerline
Statusline plugin for vim with prompts for several other applications
...Using Python has allowed unit testing of all the project code. The code is tested to work in Python 2.6+ and Python 3. Originally created exclusively for vim statuslines, the project has evolved to provide statuslines in tmux and several WMs, and prompts for shells like bash/zsh and other applications. It’s simple to write renderers for any other applications that Powerline doesn’t yet support.