Autocreate prompt content if entry is nil (#317)

* When entry in prompt doesn't yield any results, <cr> will create it on
the filesystem.

* Update config.lua

* Update picker.lua

lua/telescope/_extensions/file_browser/config.lua

@@ -45,11 +45,22 @@ _TelescopeFileBrowserConfig = {
     },
   },
   attach_mappings = function()
-    action_set.select:replace_if(function()
-      -- test whether selected entry is directory
+    local entry_is_dir = function()
       local entry = action_state.get_selected_entry()
       return entry and entry.Path:is_dir()
-    end, fb_actions.open_dir)
+    end
+
+    local entry_is_nil = function(prompt_bufnr)
+      local prompt = action_state.get_current_picker(prompt_bufnr):_get_prompt()
+      local entry = action_state.get_selected_entry()
+
+      return entry == nil and #prompt > 0
+    end
+
+    action_set.select:replace_map {
+      [entry_is_dir] = fb_actions.open_dir,
+      [entry_is_nil] = fb_actions.create_from_prompt,
+    }
 
     return true
   end,

lua/telescope/_extensions/file_browser/picker.lua

@@ -30,7 +30,8 @@ local fb_picker = {}
 --- List, create, delete, rename, or move files and folders of your cwd.<br>
 --- Notes
 --- - Default keymaps in insert/normal mode:
----   - `<cr>`   : Opens the currently selected file, or navigates to the currently selected directory
+---   - `<cr>`   : Opens the currently selected file/directory, or creates whatever is in the prompt
+---   - `<s-cr>` : Create path in prompt
 ---   - `/`, `\` : (OS Path separator) When typing filepath, the path separator will open a directory like `<cr>`.
 ---   - `<A-c>/c`: Create file/folder at current `path` (trailing path separator creates folder)
 ---   - `<A-r>/r`: Rename multi-selected files/folders