Custom entry maker fails with warning "table index is nil"

[jzbyers]

Description

I have a custom entry maker for listing functions and methods in Go programs, and it fails with a "table index is nil" error coming from the lua/telescope/sorters.lua program.

Here's the configuration I'm using:

function ListFunctionsAndMethods()
  require('telescope.builtin').lsp_document_symbols({
    symbols = { 'function', 'method' },
    entry_maker = function(entry)
      local formatted = string.format("%s [line %d]", entry.text, entry.lnum)
      return {
        value = entry.text,
        valid = true,
        ordinal = entry.text,
        display = formatted,
        lnum = entry.lnum,
        kind = entry.kind,
        col = entry.col,
        filename = entry.filename,
      }
    end
  })
end


vim.api.nvim_set_keymap('n', '<leader>lf', 
  ":lua ListFunctionsAndMethods()<CR>", 
  { noremap = true, silent = true }
)

Here's the warning message I see in Neovim:

[telescope] [WARN  15:04:47] /Users/jzbyers/.local/share/nvim/lazy/telescope.nvim/lua/telescope/pickers.lua:498: Finder failed with msg:  ...share/nvim/lazy/telescope.nvi
m/lua/telescope/sorters.lua:597: table index is nil

Neovim version

NVIM v0.10.2
Build type: Release
LuaJIT 2.1.1727870382

Operating system and version

macOS 15.1

Telescope version / branch / rev

telescope 0.1.8

checkhealth telescope

telescope: health#telescope#check

Checking for required plugins ~
- OK plenary installed.
- OK nvim-treesitter installed.

Checking external dependencies ~
- OK rg: found ripgrep 14.1.1
- OK fd: found fd 10.2.0

===== Installed extensions ===== ~

Steps to reproduce

1. Add a mapping to trigger this function:

function ListFunctionsAndMethods()
  require('telescope.builtin').lsp_document_symbols({
    symbols = { 'function', 'method' },
    entry_maker = function(entry)
      local formatted = string.format("%s [line %d]", entry.text, entry.lnum)
      return {
        value = entry.text,
        valid = true,
        ordinal = entry.text,
        display = formatted,
        lnum = entry.lnum,
        kind = entry.kind,
        col = entry.col,
        filename = entry.filename,
      }
    end
  })
end


vim.api.nvim_set_keymap('n', '<leader>lf', 
  ":lua ListFunctionsAndMethods()<CR>", 
  { noremap = true, silent = true }
)

2. Open any Go program (or any program with functions, for that matter).

3. Use the mapping you setup or just call the function yourself: :lua ListFunctionsAndMethods()

4. You will probably see nothing. Check :messages to see any warnings:

[telescope] [WARN  15:16:08] /Users/jzbyers/.local/share/nvim/lazy/telescope.nvim/lua/telescope/pickers.lua:498: Finder failed with msg:  ...share/nvim/lazy/telescope.nvi
m/lua/telescope/sorters.lua:597: table index is nil

Expected behavior

I expect the finder to be populated with results

Actual behavior

The finder is empty because Telescope failed to sort the table results

Minimal config

function ListFunctionsAndMethods()
  require('telescope.builtin').lsp_document_symbols({
    symbols = { 'function', 'method' },
    entry_maker = function(entry)
      local formatted = string.format("%s [line %d]", entry.text, entry.lnum)
      return {
        value = entry.text,
        valid = true,
        ordinal = entry.text,
        display = formatted,
        lnum = entry.lnum,
        kind = entry.kind,
        col = entry.col,
        filename = entry.filename,
      }
    end
  })
end


vim.api.nvim_set_keymap('n', '<leader>lf', 
  ":lua ListFunctionsAndMethods()<CR>", 
  { noremap = true, silent = true }
)

[jzbyers]

FWIW, things work when I don't use a custom entry_maker:

vim.api.nvim_set_keymap('n', '<leader>lf', 
  ":lua require('telescope.builtin').lsp_document_symbols({ symbols={'function', 'method'} })<CR>", 
  { noremap = true, silent = true }
)

The reason why I want the custom entry_maker is so I can format the results the way I want (the function and method names often get cutoff by the symbol kind).

[Conni2461]

does it work if value = entry?

[jzbyers]

does it work if value = entry?

Sadly, no. Same error as before:

[telescope] [WARN  11:16:09] /Users/jzbyers/.local/share/nvim/lazy/telescope.nvim/lua/telescope/pickers.lua:498: Finder failed with msg:  ...share/nvim/lazy/telescope.nvim/lua/telescope/sorters.lua:597: table index is nil

I'm using vim.notify to debug and I'm seeing entries...

Here's the config I'm using:

function ListFunctionsAndMethods()
  require('telescope.builtin').lsp_document_symbols({
    symbols = { 'function', 'method' },
    entry_maker = function(entry)
      vim.notify(vim.inspect(entry), vim.log.levels.DEBUG)
      local formatted = string.format("%s [line %d]", entry.text, entry.lnum)
      return {
        value = entry,
        valid = true,
        ordinal = entry.text,
        display = formatted,
        lnum = entry.lnum,
        kind = entry.kind,
        col = entry.col,
        filename = entry.filename,
      }
    end
  })
end


vim.api.nvim_set_keymap('n', '<leader>lf', 
  ":lua ListFunctionsAndMethods()<CR>", 
  { noremap = true, silent = true }
)

And here's what notify outputs:

{
  bufnr = 1,
  col = 6,
  filename = "/Users/jzbyers/src/github.com/odentech/goden/cmd/filestorageproxy/main.go",
  kind = "Function",
  lnum = 19,
  text = "[Function] main"
}

But the results are still empty and I'm getting the same error I posted above.

[nicolas-martin]

This issue is a big old, but I've had the same error. Was able to resolve it by using telescope's built in function

  entry_maker = function(entry)
          local make_entry = require("telescope.make_entry")

          -- Use the default diagnostic entry maker as base
          local default_maker = make_entry.gen_from_diagnostics()
          local entry_tbl = default_maker(entry)

          -- Just modify the display to be simpler
          if entry_tbl then
                  entry_tbl.display = string.format(
                          "[%s](%s) %s ",
                          entry.type or "UNKNOWN",
                          vim.fn.fnamemodify(entry.filename or "", ":t"),
                          entry.message or entry.text or ""
                  )
          end

          return entry_tbl
  end,