[regression] additional_args breaks live_grep

[smjonas]

Description

:Telescope live_grep does not work at all since 9cf4658 when setting pickers.live_grep.additional_args (bisected).

Neovim version

NVIM v0.9.0-dev-1729+g2d8bbe468                                                                                                                                                                                                         
Build type: Debug                                                                                                                                                                                                                       
LuaJIT 2.1.0-beta3

Operating system and version

Linux 20.2

Telescope version / branch / rev

master (since 9cf4658)

checkhealth telescope

==============================================================================
telescope: require("telescope.health").check()

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

Checking external dependencies ~
- OK rg: found ripgrep 11.0.2
- WARNING fd: not found. Install [sharkdp/fd](https://github.com/sharkdp/fd) for extended capabilities

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

Telescope Extension: `fzf` ~
- OK lib working as expected
- OK file_sorter correctly configured
- OK generic_sorter correctly configured

Steps to reproduce

1. nvim -u minimal.lua minimal.lua
2. :Telescope live_grep
3. Type something

Expected behavior

live_grep should work when additional_args is set

Actual behavior

[TL;DR: see the screenshot below]

• the filename and the contents somehow get merged (when pressing enter, Telescope will try to open this concatenated string as a file, e.g. the filename becomes "test.lua:3:35:vim.api.nvim_create_user_command("Testt", function() end, {" [New] --No lines in buffer--)
• the preview is empty
• scrolling down sometimes causes errors when the "filename" contains an opening but not a closing bracket:

Error executing vim.schedule lua callback: Vim:E220: Missing }.
stack traceback:
        [C]: in function 'expand'
        ...packer/start/telescope.nvim/lua/telescope/from_entry.lua:33: in function 'path'
        ...scope.nvim/lua/telescope/previewers/buffer_previewer.lua:471: in function 'define_preview'
        ...scope.nvim/lua/telescope/previewers/buffer_previewer.lua:388: in function 'preview'
        ...ck/packer/start/telescope.nvim/lua/telescope/pickers.lua:1075: in function 'refresh_previewer'
        ...ck/packer/start/telescope.nvim/lua/telescope/pickers.lua:1028: in function 'set_selection'
        ...ck/packer/start/telescope.nvim/lua/telescope/pickers.lua:1360: in function '_do_selection'
        ...ck/packer/start/telescope.nvim/lua/telescope/pickers.lua:1322: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

Minimal config

vim.cmd([[set runtimepath=$VIMRUNTIME]])
vim.cmd([[set packpath=/tmp/nvim/site]])
local package_root = "/tmp/nvim/site/pack"
local install_path = package_root .. "/packer/start/packer.nvim"
local function load_plugins()
	require("packer").startup({
		{
			"wbthomason/packer.nvim",
			{
				"nvim-telescope/telescope.nvim",
				requires = {
					"nvim-lua/plenary.nvim",
					"nvim-treesitter/nvim-treesitter",
					{ "nvim-telescope/telescope-fzf-native.nvim", run = "make" },
				},
			},
			-- ADD PLUGINS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
		},
		config = {
			package_root = package_root,
			compile_path = install_path .. "/plugin/packer_compiled.lua",
			display = { non_interactive = true },
		},
	})
end

_G.load_config = function()
	require("telescope").setup({
		pickers = {
			live_grep = {
				additional_args = { "-tlua" },
			},
		},
	})
	require("telescope").load_extension("fzf")
	-- ADD INIT.LUA SETTINGS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
end
if vim.fn.isdirectory(install_path) == 0 then
	print("Installing Telescope and dependencies.")
	vim.fn.system({ "git", "clone", "--depth=1", "https://github.com/wbthomason/packer.nvim", install_path })
end
load_plugins()
require("packer").sync()
vim.cmd([[autocmd User PackerComplete ++once echo "Ready!" | lua load_config()]])

[Conni2461]

Thanks for reporting :) #2306 should fix your issue