Split make_file back out into make_filename and make_file. It turns out that make_filename is useful by itself.

If the argument to make_file can act like a file, return it. This is useful for code that calls command functions, but doesn't want to send I/O through the filesystem.

Merge with Matt's tip.

Update tests to reflect walk changes.

An empty .hgignore file must cause us to ignore nothing, not everything!

Update docs for annotate and diff.

Convert annotate over to walk interface. Add emptyok parameter to walk and matchpats, for commands that require at least one name.

Convert diff command over to using walk code.

Add name matching to status command.

Only walk over files that match our criteria.