UnhandledPromiseRejection when opening Telescope

[wilriker]

Neovim version (nvim -v | head -n1)

nvim v0.7.0

Operating system/version

Arch Linux

How to reproduce the issue

1. Open Telescope

Expected behavior

No errors

Actual behavior

When I open Telescope (git-files in this case) I see at least sometimes:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:
...vim/site/pack/packer/start/nvim-ufo/lua/ufo/provider.lua:48: ...site/pack/packer/start/nvim-ufo/lua/ufo/provider/lsp.lua:58: attempt to call method 'match' (a nil value)
stack traceback:
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

[kevinhwang91]

What's lsp client?

[wilriker]

In this case it is gopls.

Also the error seems to go away after I opened a fold for the first time (closing folds does not make it go away).

[kevinhwang91]

Not a server, I mean coc.nvim or nvim lsp. It's weird that throw a nil reason by error()

[wilriker]

I'm sorry, I use nvim LSP client.

[wilriker]

Update: I now also got it after closing and opening a fold again, so no reliable way to get it solved (that I know of).

[kevinhwang91]

I can swallow the nil reason in the fallback function for the nvimlsp client, but it's fragile, need to handle it inside nvimlsp, need time to explore the source code.

[kevinhwang91]

Update: I now also got it after closing and opening a fold again, so no reliable way to get it solved (that I know of).

Give a context please, what buffer content and filetype, what's UfoInspect output?

[wilriker]

I meant that I previously wrote

Also the error seems to go away after I opened a fold for the first time (closing folds does not make it go away).

but that was most likely a coincidence. I could also produce the error after closing and reopening a fold.

Nevertheless, the base buffer outputs for UfoInspect:

Buffer: 7
Fold Status: start
Main provider: lsp
Fallback provider: indent
Selected provider: lsp

but that is (at least seems to me) irrelevant since the error only occurs once I try to open Telescope and there it states

Buffer: 15
Fold Status: start
Main provider: lsp
Fallback provider: indent
Selected provider: nil

What I forgot to mention this far: I use vim sessions heavily, so after starting nvim in 99.9% of the times I load a session. When I do that I sometimes (but not always) also get this message:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:
...vim/site/pack/packer/start/nvim-ufo/lua/ufo/provider.lua:48: ...site/pack/packer/start/nvim-ufo/lua/ufo/provider/lsp.lua:61: /usr/share/nvim/runtime/lua/vim/uri.lua:84: Invalid buffer id: 1
stack traceback:
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

Might be related.

The error though seems to go away after some time at least sometimes. Very hard spurious.

[kevinhwang91]

Please update the code, I have checked buffer valid before request server.

[wilriker]

Updated, problem still present. I even deleted my session and created a new one.

When I open Telescope I still get the exact same error message as in the issue description. UfoInspect now has a slightly different output for the telescope buffer though:

Buffer: 14
Fold Status: start
Main provider: lsp
Fallback provider: indent
Selected provider: indent

[kevinhwang91]

try try-fix-nvimlsp branch please, and post the message if has any errors.

[wilriker]

Error also present and still exactly the same:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:
...vim/site/pack/packer/start/nvim-ufo/lua/ufo/provider.lua:48: ...site/pack/packer/start/nvim-ufo/lua/ufo/provider/lsp.lua:58: attempt to call method 'match' (a nil value)
stack traceback:
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

[kevinhwang91]

I think I have known the reason, please update the code and post the error again, I want to confirm that.

[wilriker]

Error message changed now:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:
{ ["message"] = read /: is a directory, ["code"] =  }
stack traceback:
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

[kevinhwang91]

Look like sending a buffer is a directory, can you confirm that?

[wilriker]

Sorry, I don't understand what you mean by that.

What I do is simply opening a Telescope window. It does not matter whether that is showing files (:Telescope git_files), help (:Telescope help_tags) or git branches (:Telescope git_branches). I always get the same error message. I have no idea where the root directory / could come into play here.

[zbindenren]

I have a similar issue if I commit via neogit:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:                                                                                                                                                                                                         
...vim/site/pack/packer/start/nvim-ufo/lua/ufo/provider.lua:48: ...site/pack/packer/start/nvim-ufo/lua/ufo/provider/lsp.lua:58: attempt to call method 'match' (a nil value)                                                                                                                  
stack traceback:                                                                                                                                                                                                                                                                              
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>                                                                                                                                                                                            
Press ENTER or type command to continue       

The filetype is: NeogitStatus and it does not happen every time.

[kevinhwang91]

I have a similar issue if I commit via neogit:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:                                                                                                                                                                                                         
...vim/site/pack/packer/start/nvim-ufo/lua/ufo/provider.lua:48: ...site/pack/packer/start/nvim-ufo/lua/ufo/provider/lsp.lua:58: attempt to call method 'match' (a nil value)                                                                                                                  
stack traceback:                                                                                                                                                                                                                                                                              
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>                                                                                                                                                                                            
Press ENTER or type command to continue       

The filetype is: NeogitStatus and it does not happen every time.

Please update the code from main branch, will show the true error.

[kevinhwang91]

Sorry, I don't understand what you mean by that.

What I do is simply opening a Telescope window. It does not matter whether that is showing files (:Telescope git_files), help (:Telescope help_tags) or git branches (:Telescope git_branches). I always get the same error message. I have no idea where the root directory / could come into play here.

The message looks like returning by the language server, we should avoid sending invalid buffers, need the condition to filter them out.

[kevinhwang91]

Telescope and Neogit buffers are all nofile buftype, I am not sure whether should skip nofile at ufo,

    require('ufo').setup({
        provider_selector = function(bufnr, filetype)
            if vim.bo[bufnr].bt == 'nofile' then
                return ''
            end
        end,
    })

should work.

If someone master nvim lsp please tell me, need help.

[wilriker]

Telescope and Neogit buffers are all nofile buftype, I am not sure whether should skip nofile at ufo,

    require('ufo').setup({
        provider_selector = function(bufnr, filetype)
            if vim.bo[bufnr].bt == 'nofile' then
                return ''
            end
        end,
    })

should work.

I can confirm that this removes the error message for me.

[zbindenren]

 provider_selector = function(bufnr, filetype)
            if vim.bo[bufnr].bt == 'nofile' then
                return ''
            end
        end,

I still get the error for neogit:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:                                                                                                                                                                                                         
{ ["code"] = 0, ["message"] = stat /home/rz/repos/gitlab.com/linux/ces/ces-operator/NeogitStatus: no such file or director }                                                                                                                                                              
stack traceback:                                                                                                                                                                                                                                                                              
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

And I have the following ufo config:

local status_ok, ufo = pcall(require, "ufo")
if not status_ok then
    vim.notify("ufo (fold) plugin not found!")
    return
end

vim.wo.foldlevel = 99
vim.wo.foldenable = true

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.foldingRange = {
    dynamicRegistration = false,
    lineFoldingOnly = true,
}

local handler = function(virtText, lnum, endLnum, width, truncate)
    local newVirtText = {}
    local suffix = ("  %d "):format(endLnum - lnum)
    local sufWidth = vim.fn.strdisplaywidth(suffix)
    local targetWidth = width - sufWidth
    local curWidth = 0
    for _, chunk in ipairs(virtText) do
        local chunkText = chunk[1]
        local chunkWidth = vim.fn.strdisplaywidth(chunkText)
        if targetWidth > curWidth + chunkWidth then
            table.insert(newVirtText, chunk)
        else
            chunkText = truncate(chunkText, targetWidth - curWidth)
            local hlGroup = chunk[2]
            table.insert(newVirtText, { chunkText, hlGroup })
            chunkWidth = vim.fn.strdisplaywidth(chunkText)
            -- str width returned from truncate() may less than 2nd argument, need padding
            if curWidth + chunkWidth < targetWidth then
                suffix = suffix .. (" "):rep(targetWidth - curWidth - chunkWidth)
            end
            break
        end
        curWidth = curWidth + chunkWidth
    end
    table.insert(newVirtText, { suffix, "MoreMsg" })
    return newVirtText
end

-- global handler
ufo.setup({
    fold_virt_text_handler = handler,
    provider_selector = function(bufnr, filetype)
        if vim.bo[bufnr].bt == "nofile" then
            return ""
        end
    end,
})

[kevinhwang91]

 provider_selector = function(bufnr, filetype)
            if vim.bo[bufnr].bt == 'nofile' then
                return ''
            end
        end,

I still get the error for neogit:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:                                                                                                                                                                                                         
{ ["code"] = 0, ["message"] = stat /home/rz/repos/gitlab.com/linux/ces/ces-operator/NeogitStatus: no such file or director }                                                                                                                                                              
stack traceback:                                                                                                                                                                                                                                                                              
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

And I have the following ufo config:

local status_ok, ufo = pcall(require, "ufo")
if not status_ok then
  vim.notify("ufo (fold) plugin not found!")
  return
end

vim.wo.foldlevel = 99
vim.wo.foldenable = true

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.foldingRange = {
  dynamicRegistration = false,
  lineFoldingOnly = true,
}

local handler = function(virtText, lnum, endLnum, width, truncate)
  local newVirtText = {}
  local suffix = ("  %d "):format(endLnum - lnum)
  local sufWidth = vim.fn.strdisplaywidth(suffix)
  local targetWidth = width - sufWidth
  local curWidth = 0
  for _, chunk in ipairs(virtText) do
      local chunkText = chunk[1]
      local chunkWidth = vim.fn.strdisplaywidth(chunkText)
      if targetWidth > curWidth + chunkWidth then
          table.insert(newVirtText, chunk)
      else
          chunkText = truncate(chunkText, targetWidth - curWidth)
          local hlGroup = chunk[2]
          table.insert(newVirtText, { chunkText, hlGroup })
          chunkWidth = vim.fn.strdisplaywidth(chunkText)
          -- str width returned from truncate() may less than 2nd argument, need padding
          if curWidth + chunkWidth < targetWidth then
              suffix = suffix .. (" "):rep(targetWidth - curWidth - chunkWidth)
          end
          break
      end
      curWidth = curWidth + chunkWidth
  end
  table.insert(newVirtText, { suffix, "MoreMsg" })
  return newVirtText
end

-- global handler
ufo.setup({
  fold_virt_text_handler = handler,
  provider_selector = function(bufnr, filetype)
      if vim.bo[bufnr].bt == "nofile" then
          return ""
      end
  end,
})

will work now, neogit init too late.

[kevinhwang91]

maybe should stat a nofile buftype buffer before requesting foldingRange.

[zbindenren]

 provider_selector = function(bufnr, filetype)
            if vim.bo[bufnr].bt == 'nofile' then
                return ''
            end
        end,

I still get the error for neogit:

Error executing vim.schedule lua callback: UnhandledPromiseRejection with the reason:                                                                                                                                                                                                         
{ ["code"] = 0, ["message"] = stat /home/rz/repos/gitlab.com/linux/ces/ces-operator/NeogitStatus: no such file or director }                                                                                                                                                              
stack traceback:                                                                                                                                                                                                                                                                              
        ...re/nvim/site/pack/packer/start/nvim-ufo/lua/ufo/fold.lua:51: in function <Anonymous:40>

And I have the following ufo config:

local status_ok, ufo = pcall(require, "ufo")
if not status_ok then
    vim.notify("ufo (fold) plugin not found!")
    return
end

vim.wo.foldlevel = 99
vim.wo.foldenable = true

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.foldingRange = {
    dynamicRegistration = false,
    lineFoldingOnly = true,
}

local handler = function(virtText, lnum, endLnum, width, truncate)
    local newVirtText = {}
    local suffix = ("  %d "):format(endLnum - lnum)
    local sufWidth = vim.fn.strdisplaywidth(suffix)
    local targetWidth = width - sufWidth
    local curWidth = 0
    for _, chunk in ipairs(virtText) do
        local chunkText = chunk[1]
        local chunkWidth = vim.fn.strdisplaywidth(chunkText)
        if targetWidth > curWidth + chunkWidth then
            table.insert(newVirtText, chunk)
        else
            chunkText = truncate(chunkText, targetWidth - curWidth)
            local hlGroup = chunk[2]
            table.insert(newVirtText, { chunkText, hlGroup })
            chunkWidth = vim.fn.strdisplaywidth(chunkText)
            -- str width returned from truncate() may less than 2nd argument, need padding
            if curWidth + chunkWidth < targetWidth then
                suffix = suffix .. (" "):rep(targetWidth - curWidth - chunkWidth)
            end
            break
        end
        curWidth = curWidth + chunkWidth
    end
    table.insert(newVirtText, { suffix, "MoreMsg" })
    return newVirtText
end

-- global handler
ufo.setup({
    fold_virt_text_handler = handler,
    provider_selector = function(bufnr, filetype)
        if vim.bo[bufnr].bt == "nofile" then
            return ""
        end
    end,
})

will work now, neogit init too late.

neogit works now. thanks. cool plugin.

[wilriker]

My issue is solved, so would be great to have it merged back into master branch. :+1:

[kevinhwang91]

sure

[kevinhwang91]

Have handled the buftype, no need to use provider_selector to handle it by yourself.