feat: add filetype

README.md

@@ -89,6 +89,8 @@ j/k next/previous (in normal mode)
 
 Attaching your own mappings is possible and additional information will come soon.
 
+Additionally, the prompt's filetype will be `TelescopePrompt`. You can customize the filetype as you would normally.
+
 ## Status (Unstable API)
 
 While the underlying API & Infrastructure (A.K.A. Spaghetti Code) is still very much WIP and

lua/telescope/pickers.lua

@@ -218,6 +218,7 @@ function Picker:find()
   local prompt_bufnr = a.nvim_win_get_buf(prompt_win)
 
   a.nvim_win_set_option(prompt_win, 'winhl', 'Normal:TelescopeNormal')
+  a.nvim_buf_set_option(prompt_bufnr, 'filetype', 'TelescopePrompt')
 
   -- a.nvim_buf_set_option(prompt_bufnr, 'buftype', 'prompt')
   -- vim.fn.prompt_setprompt(prompt_bufnr, prompt_string)