convert: add mapname parameter to checkrevformat Upcoming patches will add new map files so we change the calling sequence of checkrevformat so that error messages will let the user know which file has the wrong rev format.

convert: replace old sha1s in the description This is a simple find-and-replace strategy for matching anything in the old description of a converted commit and, if that matched sha1 exists in the mapping, replacing it with the new sha1. In particular, this is helpful for descriptions that contain tags with messages such as, "Added tag 1.0 for commit abcde1234567" which will now be automatically converted. Tests have been updated accordingly.

template: fix shortest(node) function in pure mercurial Pure mercurial (i.e. without c extensions) does not support partialmatch() on the revlog index, so we must fall back to use revlog._partialmatch() to handle that case for us. The tests caught this. We don't use revlog._partialmatch() for the normal case because it performs a very expensive index iteration when the string being tested fails to find a unique result via index.partialmatch(). It does this in order to filter out hidden revs in hopes of the string being unique amongst non-hidden revs. For the shortest(node) case, we'd prefer performance over worrying about hidden revs.