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patch: let caller pass in root-filtering matcher (API)

Authored by martinvonz.

Description

patch: let caller pass in root-filtering matcher (API)

The --root option to hg diff does two things:

  • Shows paths relative to the given root
  • Filters paths by the given root, including copy sources

The root argument is passed through down to patch.diff(). I feel like
we can make patch.diff() more generic by not passing down the root
argument, but instead pass:

  • A function for taking a repo-relative path and printing it. I want to reuse this for showing cwd-relative paths later. This is the actual motivation for this patch.
  • A matcher that's already been filtered by the root argument
  • A second matcher that filters the copy sources

This is one step towards that.

Differential Revision: https://phab.mercurial-scm.org/D5892

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