ReadJSON reads and unmarshals a file as if it contained JSON.

ReadTOML reads and unmarshals a file as if it contained TOML.

ReadUnmarshal reads a file and then unmarshals its contents using an UnmarshalFunc.

ReadXML reads and unmarshals a file as if it contained XML.

ReadYAML reads and unmarshals a file as if it contained YAML.

WalkUp takes a starting directory and a WalkUpFunc, and calls the function, passing each ancestor of the starting directory in upwards order until the filesystem root is reached.

An UnmarshalFunc is a function for unmarshalling bytes into values.

A WalkUpFunc takes a directory and returns an error.