So with https://github.com/jmcantrell/vim-virtualenv you can display the
virtualenv in your statusline section (if you have enabled it). However
it would only become active for python buffers.
Now perhaps you want to show the virtualenv also in other filetypes like
markdown or CI scripts, so allow this by adding a variable
`airline#extensions#virtualenv#ft'` to the list of filetypes you want to
have enabled. So set:
let g:airline#extensions#virtualenv#enabled = 1
let g:airline#extensions#virtualenv#ft = ['python', 'markdown']
To allow displaying the virtual environment for python and markdown
buffers (but remember you need to have the plugin
https://github.com/jmcantrell/vim-virtualenv installed as well!)
fixes#2483
This fixes#511
It allows the virtualenv plugin to call back and tell the airline plugin
to update the statusline. Therefore, the new function
airline#extensions#virtualenv#update() is provided. However, to properly
fix this issue, the virtualenv plugin needs to call this function.
Second, depending on $VIRTUAL_ENV is not safe, since the virtualenv
plugin might define it itsself when calling :VirtualEnvActivate
Therefore skip this test and just test for existance of he
:VirtualEnvList command.
