apply a "changeset" on a file

[tommens]

"gawd file1.yml file2.yml" returns a set of changes (diffs) that allows to go from file1.yml to file2.yml
So perhaps it would be useful as well to apply "gawd file1.yml changeset" that takes as input a yaml file and a changeset et returns the file2.yml that is the result of applying the changeset to the yaml file

[AlexandreDecan]

I really like this idea. Gawd, to some extent, can be compared to diff, and it would make sense to have a tool similar to patch. That said, I think this should be made in a separate tool (rather than directly supported by gawd), the same way that diff and patch are distributed.

If, at some point, we're going to develop such a gawd-patch tool, we need:

• To define what a "changeset" is (currently, it's just a list of 5-uples);
• To clarify the notion of "path" within a workflow file (perhaps we need to turn the string representation of a path into an actual object, so we can manipulate it more easily, by allowing wildcards for example);
• To find a way to preserve syntactic elements (whitespaces, blank lines, comments, string formatting, etc.);