A vim status line item to display git branch name and status of the currently edited file. To be put in the ~/.vimrc.

gistfile1.vim

" returns a string <branch/XX> where XX corresponds to the git status
" (for example "<master/ M>")
function! CurrentGitStatus()
    let gitoutput = systemlist('cd '.expand('%:p:h:S').' && git status --porcelain -b 2>/dev/null')
    if len(gitoutput) > 0
        let b:gitstatus = strpart(get(gitoutput,0,''),3) .'/'. strpart(get(gitoutput,1,' '),1,2)
    else
        let b:gitstatus = ''
    endif
endfunc
autocmd BufEnter,BufWritePost * call CurrentGitStatus()
" example of use in the status line:
set stl=%f\ %(<%{b:gitstatus}>%)

I was messing around trying to awk the output of :Git status from fugitive, and I found your code. really helped me! thanks.

function! MyFugitive()
    let _ = fugitive#head()
    if exists("g:gitstatus")
        if g:gitstatus == "true"
            return strlen(_) ? "   "._ : ""
        else
            return strlen(_) ? "   "._ : ""
        endif
    else
        return
    endif
endfunction

function! GetGitStatus()
    let gitoutput = systemlist('cd '.expand('%:p:h:S').' && git status --porcelain -b 2>/dev/null | grep M')
    if len(gitoutput) > 0
        let g:gitstatus = "true"
    else
        let g:gitstatus = "false"
    endif
endfunc

autocmd BufEnter,BufWritePost * call GetGitStatus()

I don't tested so much but seems like this works for lightline. idk but it's working now.