difftacular 0.2

This Breezy plugin adds a few commands that perform variants on the basic brz diff command.

brz diff-mainline performs a diff between the specified revisions, reflecting only changes originated in the mainline: that is, it first applies any merges introduced between the old and new revisions to a temporary copy of the old tree, and then performs a diff between that temporary copy and the new tree. For example, this can be used to see changes introduced while resolving conflicts during a manual merge.

brz diff-ignore-branches performs a diff between the specified revisions, but ignoring merges from the specified branches.

brz preview-diff performs a preview diff in the style used by Launchpad merge proposals: it shows the diff that would be introduced by merging the tip of the source branch into the target branch. If a prerequisite branch is also given using the --prerequisite-branch option, then it will merge the tip of the prerequisite branch into a temporary copy of the target branch, and then show the diff that would be introduced by merging the tip of the source branch into that temporary copy.