clean up `custom.telescope`

lua/custom/telescope.lua

+local nmap = require("custom._utils").nmap
+local telescope = require('telescope')
+local actions = require("telescope.actions")
+local builtin = require("telescope.builtin")
+
 -- See `:help telescope` and `:help telescope.setup()`
-require('telescope').setup {
+telescope.setup {
   defaults = {
     mappings = {
       i = {
         ['<C-u>'] = false,
         ['<C-d>'] = false,
-        ['<Esc>'] = require('telescope.actions').close,
-        ['<C-l>'] = require('telescope.actions').select_vertical,
-        ['<C-j>'] = require('telescope.actions').select_horizontal,
+        ['<Esc>'] = actions.close,
+        ['<C-l>'] = actions.select_vertical,
+        ['<C-j>'] = actions.select_horizontal,
       },
     },
   },
 }
 
 -- Enable telescope fzf native, if installed
-pcall(require('telescope').load_extension, 'fzf')
+pcall(telescope.load_extension, 'fzf')
 
 -- Custom live_grep function to search in git root
 local function live_grep_git_root()
   local git_root = require("custom._utils").find_git_root()
   if git_root then
-    require('telescope.builtin').live_grep {
+    builtin.live_grep {
       search_dirs = { git_root },
     }
   end
@@ -28,35 +33,35 @@ end
 vim.api.nvim_create_user_command('LiveGrepGitRoot', live_grep_git_root, {})
 
 -- See `:help telescope.builtin`
-vim.keymap.set('n', '<leader>?', require('telescope.builtin').oldfiles, { desc = '[?] Find recently opened files' })
-vim.keymap.set('n', '<leader><space>', function()
-  require('telescope.builtin').buffers {
+nmap('<leader>?', builtin.oldfiles, '[?] Find recently opened files')
+nmap('<leader><space>', function()
+  builtin.buffers {
     ignore_current_buffer = true,
     sort_last_used = true
   }
-end, { desc = '[ ] Find existing buffers' })
-vim.keymap.set('n', '<leader>/', function()
+end, '[ ] Find existing buffers')
+nmap('<leader>/', function()
   -- You can pass additional configuration to telescope to change theme, layout, etc.
-  require('telescope.builtin').current_buffer_fuzzy_find(require('telescope.themes').get_dropdown {
+  builtin.current_buffer_fuzzy_find(require('telescope.themes').get_dropdown {
     winblend = 10,
     previewer = false,
   })
-end, { desc = '[/] Fuzzily search in current buffer' })
+end, '[/] Fuzzily search in current buffer')
 
-vim.keymap.set('n', '<leader>sgf', require('telescope.builtin').git_files, { desc = 'Search [G]it [F]iles' })
+nmap('<leader>sgf', builtin.git_files, 'Search [G]it [F]iles')
 local function telescope_live_grep_open_files()
-  require('telescope.builtin').live_grep {
+  builtin.live_grep {
     grep_open_files = true,
     prompt_title = 'Live Grep in Open Files',
   }
 end
-vim.keymap.set('n', '<leader>s/', telescope_live_grep_open_files, { desc = '[S]earch [/] in Open Files' })
-vim.keymap.set('n', '<leader>ss', require('telescope.builtin').builtin, { desc = '[S]earch [S]elect Telescope' })
-vim.keymap.set('n', '<leader>gf', require('telescope.builtin').git_files, { desc = 'Search [G]it [F]iles' })
-vim.keymap.set('n', '<leader>sf', require('telescope.builtin').find_files, { desc = '[S]earch [F]iles' })
-vim.keymap.set('n', '<leader>sh', require('telescope.builtin').help_tags, { desc = '[S]earch [H]elp' })
-vim.keymap.set('n', '<leader>sw', require('telescope.builtin').grep_string, { desc = '[S]earch current [W]ord' })
-vim.keymap.set('n', '<leader>slg', require('telescope.builtin').live_grep, { desc = '[S]earch by [G]rep' })
-vim.keymap.set('n', '<leader>sG', ':LiveGrepGitRoot<cr>', { desc = '[S]earch by [G]rep on Git Root' })
-vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { desc = '[S]earch [D]iagnostics' })
-vim.keymap.set('n', '<leader>sr', require('telescope.builtin').resume, { desc = '[S]earch [R]esume' })
+nmap('<leader>s/', telescope_live_grep_open_files, '[S]earch [/] in Open Files')
+nmap('<leader>ss', builtin.builtin, '[S]earch [S]elect Telescope')
+nmap('<leader>gf', builtin.git_files, 'Search [G]it [F]iles')
+nmap('<leader>sf', builtin.find_files, '[S]earch [F]iles')
+nmap('<leader>sh', builtin.help_tags, '[S]earch [H]elp')
+nmap('<leader>sw', builtin.grep_string, '[S]earch current [W]ord')
+nmap('<leader>slg', builtin.live_grep, '[S]earch by [G]rep')
+nmap('<leader>sG', ':LiveGrepGitRoot<cr>', '[S]earch by [G]rep on Git Root')
+nmap('<leader>sd', builtin.diagnostics, '[S]earch [D]iagnostics')
+nmap('<leader>sr', builtin.resume, '[S]earch [R]esume')