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relative_path_from 

        # Pathname.relative_path_from

(from ruby core)
---
    relative_path_from(base_directory)

---

Returns a relative path from the given `base_directory` to the receiver.

If `self` is absolute, then `base_directory` must be absolute too.

If `self` is relative, then `base_directory` must be relative too.

This method doesn't access the filesystem.  It assumes no symlinks.

ArgumentError is raised when it cannot find a relative path.

Note that this method does not handle situations where the case
sensitivity of the filesystem in use differs from the operating system
default.

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