view .clang-format @ 41619:035cae1d197f

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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