attempt to call field 'ft_to_lang' (a nil value)

[daveyarwood]

Description

Since updating my Neovim packages recently, I have been getting this error when opening the Git Files dialog and then on every key press.

Neovim version

NVIM v0.11.2
Build type: Release
LuaJIT 2.1.1748459687

Operating system and version

macOS Sonoma 14.6.1

Telescope version / branch / rev

0.1.x branch

checkhealth telescope

telescope:
   1 ⚠️

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

Checking external dependencies
- ✅ OK rg: found ripgrep 14.1.1
- ⚠️ WARNING fd: not found. Install [sharkdp/fd](https://github.com/          sharkdp/fd) for extended capabilities

===== Installed extensions =====

- ✅ OK lib working as expected
- ✅ OK file_sorter correctly configured
- ✅ OK generic_sorter correctly configured

Steps to reproduce

Have fzf installed. I have version 0.62.0 from Homebrew.

Have the following telescope plugins installed:

Plug 'nvim-telescope/telescope.nvim', { 'branch': '0.1.x' }
Plug 'nvim-telescope/telescope-fzf-native.nvim', { 'do': 'make' }
Plug 'nvim-telescope/telescope-symbols.nvim'

Here is my Telescope config:

local telescope = require("telescope")
local builtin = require("telescope.builtin")

telescope.setup {
  pickers = {
    buffers = { theme = "ivy" },
    diagnostics = { theme = "ivy" },
    find_files = { theme = "ivy" },
    git_files = { theme = "ivy" },
    help_tags = { theme = "ivy" },
    keymaps = { theme = "ivy" },
    live_grep = { theme = "ivy" },
    lsp_references = { theme = "ivy" },
    lsp_workspace_symbols = { theme = "ivy" },
    symbols = { theme = "ivy" },
  }
}

-- Extensions

telescope.load_extension("fzf")

-- Mappings (abbreviated)

vim.keymap.set('n', "<c-f>", builtin.git_files)

Attempt to use mapping to run the git_files builtin.

Expected behavior

No errors, can use fzf to select a file from the repo to edit.

Actual behavior

I can use fzf to select a file from the repo to edit and it works as expected, however I get the error below when opening the picker and on every key press.

Stack trace

Error executing vim.schedule lua callback: ...bundle/telescope.nvim/lua/telescope/previewers/utils.lua:135: attempt to call field 'ft_to_lang' (a nil v
alue)
stack traceback:
        ...bundle/telescope.nvim/lua/telescope/previewers/utils.lua:135: in function 'ts_highlighter'
        ...bundle/telescope.nvim/lua/telescope/previewers/utils.lua:119: in function 'highlighter'
        ...scope.nvim/lua/telescope/previewers/buffer_previewer.lua:247: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

Screenshot

Minimal config

See above.

[kytpbs]

Having the exact same issue, I thought I had broken something myself and was trying to fix my config for the last 3 hours...

[broken-wheel]

I had the same issue. Looks like the problem is because of the difference between nvim-treesitter's main vs. master, 0.10.0etc.

main:

https://github.com/nvim-treesitter/nvim-treesitter/blob/main/lua/nvim-treesitter/parsers.lua

---@type nvim-ts.parsers
return {
  ada = {
    install_info = {
      revision = 'e8e2515465cc2d7c444498e68bdb9f1d86767f95',
      url = 'https://github.com/briot/tree-sitter-ada',
    },
    maintainers = { '@briot' },
    tier = 2,
  },
...

0.10.0:

https://github.com/nvim-treesitter/nvim-treesitter/blob/v0.10.0/lua/nvim-treesitter/parsers.lua

local api = vim.api
local ts = vim.treesitter

for ft, lang in pairs {
  automake = "make",
  javascriptreact = "javascript",
  ecma = "javascript",
  jsx = "javascript",
  gyp = "python",
  html_tags = "html",
  ["typescript.tsx"] = "tsx",
  ["terraform-vars"] = "terraform",
  ["html.handlebars"] = "glimmer",
...

So, using v0.10.0 worked

• Lazy config

	{ "nvim-treesitter/nvim-treesitter", tag = "v0.10.0", lazy = false, build = ":TSUpdate" },

• Plugin setup

local configs = require("nvim-treesitter.configs")

configs.setup({
	ensure_installed = {
		"python",
		"cpp",
		"c",
		"proto",
		"dockerfile",
		"starlark",
		"bash",
		"javascript",
		"lua",
	},
	sync_install = false,
	highlight = { enable = true },
	indent = { enable = false },
})

[genericCandy]

I'm having the same issue, is there a way around it while still using the main branch of nvim-treesitter, or should i just switch to master ?

[calebsb3]

From what I could find, the ft_to_lang method was being used for highlighting in telescope's preview. Thus, a quick fix that I implemented to kind of bypass the warning is to disable treesitter for the preview screen using this

require("telescope").setup({
  defaults = {
    preview = {
      treesitter = false,
    },
  },
})

Personally, I just added the preview section because I already had some defaults setup for telescope. This was more convenient for me than downgrading treesitter to 0.10.0

[Juhan280]

You are in the wrong branch of telescope. I am assuming you got this branch (0.1.x) from that latest tag release (0.1.8). There is no further development happening on that branch. Switch to master branch instead. It is already fixed in this commit d8c5ed4

[daveyarwood]

So I guess this part of the README is no longer accurate?

[daveyarwood]

Confirmed that removing the plugin and reinstalling from the master branch fixed my issue.

[Juhan280]

So I guess this part of the README is no longer accurate?

Considering the fact that the commit I linked is 2 and half years old and its still not in a release tag, we can assert that this part of the readme is indeed incorrect

[daveyarwood]

It seems clear that master is actually the right branch to use, and the issue is fixed there, so closing this.