Feature/generate on changes

[anymaniax]

Status

WIP

Description

It's a new feature to be able to only regenerate when the specification change. It's check the git history to be able to do a diff and check if the specification file between to generation. So could be use with a git hook on after a pull for example.

I am not sure if it could be useful or not and about the implementation.

@soartec-lab @melloware what do you think about this?