Viper-Config

Viper-Config is a really simple demo application that uses viper to parse both config files and command line flags

Running with flags:

go run main.go --spec.intConfig=1 --spec.stringConfig="hello world" --spec.boolConfig=true

Running with config file:

go run main.go --config "$PWD/config/local.yaml"

Running with both:

go run main.go --config "$PWD/config/local.yaml" --spec.stringConfig="yaml and flags"

We can also use short flags to avoid spec.foo

go run main.go --config "$PWD/config/local.yaml" -s="short flag"

Finally

If you pay close attention to the yaml file you can see that intConfig is commented out. This gives us the ability to not have to write full yaml files if we only want to change a couple of fields