Powerful Command-Line Applications in Go

Including OS-Specific Data

Each one of the tools you’re using to send the system notification has a different requirement for the notification severity. For example, on Linux notify-send expects severities as low, normal, or critical, while on Windows your script defines the type of icons such as Info, Warning, or Error. Finally, terminal-notifier on macOS doesn’t use severities so you’ll display the notification as text with the notification title.

The users of your package define the severity using a constant value of the Severity type. Let’s write a method String that converts the value to a string representation according to each tool’s specific requirements based on the running operating system.

In Go, you can use the runtime package to ...