feat: current buffer fuzzy find improvements (#694)

If you don't want to have a previewer disable it with `:Telescope current_buffer_fuzzy_find previewer=false`
To ignore empty lines do: `:Telescope current_buffer_fuzzy_find skip_empty_lines=true`

lua/telescope/builtin/files.lua

@@ -329,34 +329,35 @@ files.treesitter = function(opts)
 end
 
 files.current_buffer_fuzzy_find = function(opts)
+  -- All actions are on the current buffer
+  local bufnr = vim.api.nvim_get_current_buf()
+  local filename = vim.fn.expand(vim.api.nvim_buf_get_name(bufnr))
+
   local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
   local lines_with_numbers = {}
-  for k, v in ipairs(lines) do
-    table.insert(lines_with_numbers, {k, v})
-  end
 
-  local bufnr = vim.api.nvim_get_current_buf()
+  for lnum, line in ipairs(lines) do
+    table.insert(lines_with_numbers, {
+      lnum = lnum,
+      line = line,
+      bufnr = bufnr,
+      filename = filename,
+    })
+  end
 
   pickers.new(opts, {
     prompt_title = 'Current Buffer Fuzzy',
     finder = finders.new_table {
       results = lines_with_numbers,
-      entry_maker = function(enumerated_line)
-        return {
-          bufnr = bufnr,
-          display = enumerated_line[2],
-          ordinal = enumerated_line[2],
-
-          lnum = enumerated_line[1],
-        }
-      end
+      entry_maker = opts.entry_maker or make_entry.gen_from_buffer_lines(opts),
     },
     sorter = conf.generic_sorter(opts),
+    previewer = conf.grep_previewer(opts),
     attach_mappings = function()
       action_set.select:enhance {
         post = function()
           local selection = action_state.get_selected_entry()
-          vim.api.nvim_win_set_cursor(0, {selection.lnum, 0})
+          vim.api.nvim_win_set_cursor(0, { selection.lnum, 0 })
         end,
       }