export: explicitly honor all diffopts This is slightly more controversial than diff, but we hope that HGPLAIN=1 covers all the format-breaking ones. A possible alternative here that breaks BC is to honor all opts except the whitespace ones.

webcommands.annotate: explicitly only honor whitespace diffopts The whitespace ones are the only ones the annotate logic cares about anyway, so there's no visible impact.

filectx.parents: filter nullrev parent sooner We are going to introduce a linkrev-correction phases when computing parents. It will be more convenient to have the nullid parent filtered out earlier. I had to make a minimal adjustment to the rename handling logic to keep it functional. That logic have been documented in the process since it took me some time to check all the cases out.

context: catch FilteredRepoLookupError instead of RepoLookupError Now that we have a more specialised exception, lets use it when we meant to catch the more specialised case.

narrowmatcher: propagate the rel() method The full path is propagated to the original match object since this is often used directly for printing a file name to the user. This is cleaner than requiring each caller to join the prefix with the file name prior to calling it, and will lead to not having to pass the prefix around separately. It is also consistent with the bad() and abs() methods in terms of the required input. The uipath() method now inherits this path building property. There is no visible change in path style for rel() because it ultimately calls util.pathto(), which returns an os.sep based path. (The previous os.path.join() was violating the documented usage of util.pathto(), that its third parameter be '/' separated.) The doctest needed to be normalized to '/' separators to avoid test differences on Windows, now that a full path is returned for a short filename. The test changes are to drop globs that are no longer necessary when printing an absolute file in a subrepo, as returned from match.uipath(). Previously when os.path.join() was used to add the prefix, the absolute path to a file in a subrepo was printed with a mix of '/' and '\'. The absolute path for a file not in a subrepo, as returned from match.uipath(), is still purely '/' based.

match: add the abs() method This is a utility to make it easier for subrepos to convert a file name to the full path rooted at the top repository. It can replace the various path joining lambdas, and doesn't require the prefix to be passed into the method that wishes to build such a path. The name is derived from the following pattern in annotate() and other places: name = ((pats and rel) or abs) The pathname separator is not os.sep in part to avoid confusion with variables named 'abs' or similar that _are_ '/' separated, and in part because some methods like cmdutils.forget() and maybe cmdutils.add() need to build a '/' separated path to the root repo. This can replace the manual path building there.