vim9script

export def Do()
    var view = winsaveview()
    silent execute ":%!" .. &equalprg
    if v:shell_error != 0
        var errs = []
        for line in getline(1, line("$"))
            var cols = matchlist(line, '^.*:\(\d\+\):\(\d\+\):\s*\(.*\)$')
            if empty(cols) | continue | endif
            errs = add(errs, {
                filename: @%,
                lnum: str2nr(cols[1]),
                col: str2nr(cols[2]),
                text: cols[3],
            })
        endfor
        silent undo
        if !empty(errs) | setqflist(errs, "r") | endif
        echohl Error | echomsg "fmt error" | echohl None
    endif
    winrestview(view)
enddef