Question

I found AsyncCommand on StackOverflow, and found it is a terrific tool! I am trying to get it work with errormarker plugin, but encountered some problem.

i don’t know exactly what the problem is. I traced errormarker’s script, and found error use following script to hook QuickFixCmdPost to event, and set markers to lines of source files.

augroup errormarker
    autocmd QuickFixCmdPost make call <SID>SetErrorMarkers()
augroup END

According to the :help, the second argument(make) is the pattern of the file(for example: *.html). I don’t what is a make file pattern, I tried

autocmd QuickFixCmdPost AsyncMake call <SID>SetErrorMarkers()

It does not work(sure). But I don’t know what else I can do. I do googled “AsyncCommand errormarker” but get nothing.

Is there are any comment? Any suggestion is appreciated. Thanks in advance.

Answer 1

I found a solution.

The solution works, but ugly.

The key is to call errormarker‘s SetErrorMarkers() function at the right time automatically.

I tried Peter Rincker’s solution, but it turns out the AsyncCommandQuickFixCmdPost fired too early. The quickfix list is not set yet. So SetErrorMarkers() does nothing.

I read some AsyncCommand‘s manual and traced some code, the AsyncMake is actually a wrapper, which invoke

asynccommand#run(cmd, handler)

with

asynccommand#run("make", asynchandler#qf)
// where asynchandler#qf is the handler to read quick fix list back.

So, since asynchandler#qf can be called at the right time, I traced the call point of the asynchandler#qf, and find the function asynccommand#done in file asynccommand.vim line 92 call the asynchandler#qf.

function! asynccommand#done(temp_file_name)
  " Called on completion of the task
  let r = s:receivers[a:temp_file_name] "handlers are registered in s:receivers
  if type(r.dict) == type({})
    call call(r.func, [a:temp_file_name], r.dict)
  else
    call call(r.func, [a:temp_file_name])
  endif
  unlet s:receivers[a:temp_file_name]
  delete a:temp_file_name
endfunction

Got you!

Let’s add some code at line 101 to invoke the SetErrorMarkers() function

  ...
  unlet s:receivers[a:temp_file_name]
  if exists("*ExposeSetErrorMarkers")
    call ExposeSetErrorMarkers()
  endif
  delete a:temp_file_name
  ...

Notice the function we called here is ExposeSetErrorMarkers() not SetErrorMarkers(). Because the SetErrorMarkers() is a script local function, can not be called from outside of the script. so I add a delegate function ExposeSetErrorMarkers() in errormarker.vim to expose that function.

function! ExposeSetErrorMarkers()
    call s:SetErrorMarkers()
endfunction

Moreover, I add some auto commands to my .vimrc

au BufWritePost *cpp AsyncMake
au BufWritePost *cc  AsyncMake
au BufWritePost *h   AsyncMake

to invoke AsyncMake automatically every time I save my source file.

It works! Ugly, though 😛