log: move log file walk to its own function This moves the logic that determines which changesets to process during a 'hg log foo.txt' command. Putting it in its own function allows extensions to modify how the file log is traversed. For instance, the current implementation uses filelog revs heavily. Other implementations may not have filelog revs available. The function throws an exception if the traversal is not possible via the filelog, so the parent function can do things the slow way if necessary (by walking the entire commit history). Aside from the exception throwing, no logic is changed.

bundle: refactor changegroup prune to be its own function Moving the prune function to be a non-nested function allows extensions to control which revisions are allowed in the changegroup. For example, in my shallow repo extension I want to prevent filelogs from being added to the bundle. This also allows an extension to use a filelog implementation that doesn't have revlog.linkrev implemented.

filectx: refactor filectx.rev() to use filectx._changeid The code in filectx.rev() was identical to filectx._changeid. Fixing this allows alternative filectx implementations to only override _changeid.

util: add an optional timestamp parameter to makedate This will be used by the upcoming shelve extension.

util: rename ct variable in makedate to timestamp

merge: add a files method to the mergestate class This will be used in the upcoming shelve extension.