This is a tool for powerful automation of OS X. At its core, Hammerspoon is just a bridge between the operating system and a Lua scripting engine. What gives Hammerspoon its power is a set of extensions that expose specific pieces of system functionality, to the user.
You can write Lua code that interacts with OS X APIs for applications, windows, mouse pointers, filesystem objects, audio devices, batteries, screens, low-level keyboard/mouse events, clipboards, location services, wifi, and more.
Typically you would write a configuration file in Lua that connects events to actions. You might want to bind a keyboard shortcut to a series of window operations, or an applescript. You might want to run a series of commands when your wifi interface connects to your home network. You might want to display an alert when your battery drops below a certain percentage. You might want to do something crazy like have iTunes automatically start playing when your Mac detects you are in Paris.
Download the latest release and then drag the application to
Out of the box, Hammerspoon does nothing. You will need to create a Lua script in
~/.hammerspoon/init.lua using our APIs and standard Lua APIs.
You can learn more about the Lua scripting language at lua.org.
More extensions will always be a huge benefit to Hammerspoon. They can either be pure Lua scripts that offer useful helper functions, or you can write Objective-C extensions to expose new areas of system functionality to users. For more information, see the contribution guidelines on GitHub.
Bugs found on http://www.hammerspoon.org/ can be reported on GitHub
You can usually get a quick answer in our IRC channel, #hammerspoon on Freenode. A searchable archive of the channel is available here.
We have a Google Group mailing list here
If you find a bug, or have a suggestion, you can also file an issue on the issue tracker.
Lots of people! You can find out more on our Contributors page.