Comment by dashwav

Since everyone else is throwing out recommendations I personally think https://github.com/spf13/cobra is the best CLI templating system, especially because of how well it pairs with https://github.com/spf13/viper.

Large projects like Hugo and Kubernetes have used Cobra to build their CLI tools, and it's fairly light as well even if you need simpler usage. We use it at my workplace simply for wrapping our microservices and the few commands (serve, migrate, etc)