" Popup documentation of specified object under the cursor
" Requires github.com/zmb3/gogetdoc in the $PATH

function! go#getdoc#status()
    if exists("b:gogetdoc_job") && job_status(b:gogetdoc_job) == "run" | return "GD" | endif
    return ""
endfunction

function! go#getdoc#got(ch) abort
    let msgs = []
    while ch_status(a:ch) == "buffered"
        let msgs = add(msgs, ch_read(a:ch))
    endwhile
    if exists("b:godocid") | call popup_close(b:godocid) | endif
    if len(msgs) == 0
        echohl WarningMsg | echomsg "No go doc" | echohl None
        return
    endif
    let msgs = msgs[2:]
    let b:godocid = popup_atcursor(msgs[2:-2],
        \ {"wrap": 0, "title": msgs[0], "move": "word"})
endfunction

function! go#getdoc#do() abort
    if exists("b:gogetdoc_job") && job_status(b:gogetdoc_job) == "run" | return | endif
    let pos = line2byte(line(".")) + col(".") - 2
    let cmdline = "gogetdoc -pos " . expand("%p") . ":#" . pos
    echomsg cmdline
    let b:gogetdoc_job = job_start(cmdline, {
        \"in_mode": "nl",
        \"err_io": "null",
        \"close_cb": "go#getdoc#got",
    \})
endfunction