neovim/lua/plugins/telescope.lua

local telescope = require('telescope')
local actions = require('telescope.actions')
local builtin = require('telescope.builtin')

local telescope_last = 0
function telescope_resume()
  if telescope_last == 0 then
    telescope_last = 1
    builtin.live_grep()
  else
    builtin.resume()
  end
end

telescope.setup {
    defaults = {
        sorting_strategy = "ascending",
        live_grep_arguments = { 'rg',
            '--hidden', '--no-ignore', '--color=never',
            '--with-filename', '--line-number',
            '--column', '--smart-case', '--no-heading',
        },
    },
    pickers = {
        live_grep = {
            mappings = {
                i = { ["<c-f>"] = actions.to_fuzzy_refine },
                n = { ["<c-f>"] = telescope_resume },
            },
        },
        find_files = {
            cache_picker = false,
        },
        git_files = {
            cache_picker = false,
        },
    },
}

-- Snippets can be useful.
vim.keymap.set('n', '<leader>ss', telescope.extensions.luasnip.luasnip, {})

-- Fuzzy * files, symbols, buffers, help, etc.
vim.keymap.set('n', '<leader>fa', builtin.find_files)  -- f[ind]a[ll]
vim.keymap.set('n', '<leader>fb', builtin.buffers)
vim.keymap.set('n', '<leader>fd', builtin.diagnostics)
vim.keymap.set('n', '<leader>ff', builtin.git_files)
vim.keymap.set('n', '<leader>fh', builtin.help_tags)
vim.keymap.set('n', '<leader>fs', builtin.lsp_dynamic_workspace_symbols)

-- Grep (the only one).
vim.keymap.set('n', '<leader>gg', builtin.live_grep)

-- LSP navigation.
vim.keymap.set('n', '<leader>gd', builtin.lsp_definitions)
vim.keymap.set('n', '<leader>gr', builtin.lsp_references)
vim.keymap.set('n', '<leader>gi', builtin.lsp_implementations)
vim.keymap.set('n', '<leader>ci', builtin.lsp_incoming_calls)
vim.keymap.set('n', '<leader>co', builtin.lsp_outgoing_calls)