Doing this meant that the escaping functionality got used in three places, so it was extracted into a generalised function in its own module.

This is slighly slower for the case where escaped characters are displayed in the same colour as the displayable characters, which happens when listing a directory’s name when recursing. Optimise this, yeah?

Rather than the *entire* file name.

The current method is extremely inefficient, but having control characters in file names is also extremely uncommon; it’s something that should be fixed, only eventually.