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Question

I have max file size rule for files, setup in treesitter config, it works:

require 'nvim-treesitter.configs'.setup {
 highlight = {
  enable = true,
  is_supported = function()
    if vim.fn.strwidth(vim.fn.getline('.')) > 300 or vim.fn.getfsize(vim.fn.expand('%')) > 1024 * 1024 
    then
      return false
    else
      return true
  end
 }
}

but this setup doesn't work in telescope preview buffer anyway...

I tried this to disable highlight for telescope, but it doesn't work: vim.cmd([[ autocmd User TelescopePreviewerLoaded TSBufDisable highlight ]])

Is there a way to disable Treesiter in Telescope (ideally for big files only)?

UPD 1. Added this to my .config/nvim/after/plugin/telescope.lua

vim.cmd([[
  autocmd User TelescopePreviewerLoaded set filetype=
]])
vim.cmd([[
  autocmd User TelescopeFindPre set filetype=
]])

and no help .. syntax highlinght in file preview works anyway

UPD 2: What interesting, if disable treesitter at all like this:

require 'nvim-treesitter.configs'.setup {
 highlight = {
    enable = false,
 }
}

it successfully disables treesitter in telescope file preview too, but i lose (of course) syntax highlighting in simply opened files

Answer 1

Finally i found a solution, this helped: :h telescope.defaults.preview.:

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

it disables treesitter in telescope, but unfortunatelly at all.. According to this doc there is a way to disable treesitter by filetype, like preview = { treesitter = { disable = fileTypesTable }} but not by file size anyway

Answer 2

You can use the User event TelescopePreviewerLoaded to set options on the preview buffer

You disable highlighting you could do:

autocmd User TelescopePreviewerLoaded set filetype=

If you want to only disable highlighting for large file you can replace set filetype= by a custom call or command.