nvim/lua/plugins/telescope.lua

local function project_files()
	local opts = {}
	if vim.loop.fs_stat '.git' then
		opts.show_untracked = true
		require('telescope.builtin').git_files(opts)
	else
		local client = vim.lsp.get_active_clients()[1]
		if client then
			opts.cwd = client.config.root_dir
		end
		require('telescope.builtin').find_files(opts)
	end
end

local M = {
	'nvim-telescope/telescope.nvim',
	cmd = { 'Telescope' },
}

function M.config()
	local telescope = require 'telescope'
	local actions = require 'telescope.actions'
	local previewers = require 'telescope.previewers'
	local Job = require 'plenary.job'
	local new_maker = function(filepath, bufnr, opts)
		filepath = vim.fn.expand(filepath)
		Job:new({
			command = 'file',
			args = { '--mime-type', '-b', filepath },
			on_exit = function(j)
				local mime_type = vim.split(j:result()[1], '/')[1]
				if mime_type == 'text' then
					previewers.buffer_previewer_maker(filepath, bufnr, opts)
				else
					-- maybe we want to write something to the buffer here
					vim.schedule(function()
						vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, { 'BINARY' })
					end)
				end
			end,
		}):sync()
	end

	-- local fb_actions = require "telescope".extensions.file_browser.actions
	telescope.setup {
		pickers = {
			find_files = {
				theme = 'dropdown',
			},
			live_grep = {
				theme = 'dropdown',
			},
			buffers = {
				theme = 'dropdown',
			},
		},
		defaults = {
			layout_config = {
				vertical = { width = 0.5 },
				-- other layout configuration here
			},
			buffer_previewer_maker = new_maker,
			prompt_prefix = ' ',
			selection_caret = ' ',
			path_display = { 'smart' },
			file_ignore_patterns = { '.git/', 'node_modules' },

			mappings = {
				i = {
					['<Down>'] = actions.move_selection_next,
					['<Up>'] = actions.move_selection_previous,
					['<C-n>'] = actions.cycle_history_next,
					['<C-e>'] = actions.cycle_history_prev,
					['<esc>'] = actions.close,
				},
			},
			vimgrep_arguments = {
				'rg',
				'--color=never',
				'--no-heading',
				'--with-filename',
				'--line-number',
				'--column',
				'--smart-case',
				'--trim', -- add this value
			},
		},
	}
end

return M