The magic of Google Autocomplete while you're typing. Anywhere.
An extension for Hammerspoon. Once Hammerspoon is installed, copy urlencode.lua and anycomplete.lua to ~/.hammerspoon/.
To initialize, add dofile("anycomplete.lua") to ~/.hammerspoon/init.lua. Reload the Hammerspoon config.
Trigger with the hotkey ⌃⌥⌘G. Once you start typing, suggestions will populate. They can be choosen with ⌘1-9 or by pressing the arrow keys and Enter.
The hotkey can be changed by editing hs.hotkey.bind.
No keystrokes are sent to Google until you trigger the hotkey and start typing.