GT's html export machinery doesn't provide a way to change the baseUrlvalue that gets templated into pages

[botwhytho]

Although LeHtmlPageUrlAttributePiece has a setter for that value LeHtmlPageUrlAttributePiece>>#baseUrl:, how this class is called (through LeHtmlGtBookPiece) doesn't provide any way to get a reference to set this value so currently have to attach an 'after' Metalink to it's initialize method which is a rather brittle solution, otherwise 'https://book.gtoolkit.com' is used, which is GT book specific and not generic.

One approach, although not ideal, would be to have a getter for formatPiece in the LeHtmlGtBookPiece class, that way users could also add different html format pieces for adding custom template values. Think having a customizable default value plus command line argument would be the most flexible for this specific issue.