vim-AutoCommit

" requires python-vim and GitPython
" (Arch: python2-vim && python2-gitpython
" https://chris-lamb.co.uk/posts/committing-every-time-you-save-vim

function! AutoCommit()
python << PYEOF

import vim, git

def python_input(message='', default=''):
    vim.command('call inputsave()')
    vim.command("let user_input = input('" + message + "', '" + default + "')")
    vim.command('call inputrestore()')
    return vim.eval('user_input')

auto_branch = 'wip'
curfile = vim.current.buffer.name

if curfile:
    try:
        repo = git.Repo(curfile)
        relfile = curfile.replace(repo.working_dir + '/', '')
        if str(repo.active_branch) == auto_branch:
            repo.git.add(curfile)
            msg = python_input('Commit message? ', 'AUTO: ' + relfile)
            repo.git.commit(m=msg)
    except:
        pass

PYEOF
endfunction

autocmd BufWritePost * call AutoCommit()