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Hammerspoon is a powerful automation tool for macOS. It allows you to write scripts in Lua to automate tasks on your Mac. You can use it to create custom keyboard shortcuts, automate repetitive tasks, and more.

Here's a simple example of a Hammerspoon script that opens an app or even a file within an app (e.g. a journal file in your Obsidian vault); in my case, press `Ctrl + K` to open the KakaoTalk app (a popular messaging app in South Korea):

```lua
hs.hotkey.bind({"ctrl"}, "K", function()
  hs.execute("open -a 'KakaoTalk'")
end)
```

To get started with Hammerspoon, you'll need to install it from the [official website](https://www.hammerspoon.org/). Once you have it installed, you can create a `~/.hammerspoon/init.lua` file and start writing your scripts.

To use extensions, you can install them via [luarocks](https://luarocks.org/). For example, to install the `json` extension, you can run:

```bash
luarocks install lunajson
```

Then you can use it in your Hammerspoon scripts like this, in a use case for sending a message to a Slack channel:

```lua
hs.timer.doAt("08:00", "1d", function()
  payload = json.encode({
    text = "Good morning y'all! :wave:"
  })

  url = "https://hooks.slack.com/services/CHANGE/THIS/URI"
  result, err = hs.http.asyncPost(url, payload, {}, function(status, body, headers)
    if status == 200 then
      debug("Message sent to Slack!")
    else
      debug("Error sending message to Slack: " .. inspect(body))
    end
  end)
end)
```
