flagutil

func SetFlagsFromEnv ¶

func SetFlagsFromEnv(fs *flag.FlagSet, prefix string) (err error)

SetFlagsFromEnv parses all registered flags in the given flagset, and if they are not already set it attempts to set their values from environment variables. Environment variables take the name of the flag but are UPPERCASE, and any dashes are replaced by underscores. Environment variables additionally are prefixed by the given string followed by and underscore. For example, if prefix=PREFIX: some-flag => PREFIX_SOME_FLAG