spacevim/bundle/git.vim/autoload/git/fetch.vim

let s:JOB = SpaceVim#api#import('job')

function! git#fetch#run(args)

    let cmd = ['git', 'fetch'] + a:args
    call git#logger#debug('git-fetch cmd:' . string(cmd))
    call s:JOB.start(cmd,
                \ {
                \ 'on_exit' : function('s:on_exit'),
                \ }
                \ )

endfunction

function! s:on_exit(id, data, event) abort
    call git#logger#debug('git-fetch exit data:' . string(a:data))
    if a:data ==# 0
        echo 'fetch done!'
    else
        echo 'fetch failed!'
    endif
endfunction

function! git#fetch#complete(ArgLead, CmdLine, CursorPos)

    if a:ArgLead =~# '^-'
        return s:options()
    endif
    let str = a:CmdLine[:a:CursorPos-1]
    if str =~# '^Git\s\+fetch\s\+[^ ]*$'
        return join(s:remotes(), "\n")
    else
        return ''
    endif

endfunction

function! s:remotes() abort
    return map(systemlist('git remote'), 'trim(v:val)')
endfunction

function! s:options() abort
    return join([
                \ '--all',
                \ '--multiple',
                \ ], "\n")
endfunction