filelog: switch 'not len(filerevlog)' to 'not filerevlog' A few places in the code use 'if not len(revlog)' to check if the revlog exists. Replacing this with 'not filerevlog' allows alternative revlog implementations to override __nonzero__ to handle this case without implementing __len__.

annotate: simplify annotate parent function The annotate algorithm used a custom parents() function to try to reuse filectx and filelogs. I simplified it a bit to rely more heavily on the self.parents() which makes it work well with alternative filectx implementations. I tested performance on a file with 5000+ revisions but no renames, and on a file with 500 revisions repeating a series of 4 edits+renames and saw zero performance hit. In fact, it was reliably a couple milliseconds faster now. Added the perfannotate command to contrib/perf.py for future use.

changegroup: move changegroup file adding to a separate function Moving the logic that adds files to a changegroup to a different function allows extensions to override it and customize the way filelogs are added to changegroups. No logic is changed.

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.

histedit: raise ImportError when demandloading is enabled

run-tests: add --loop support This makes it easy to run tests repeatedly at high loads to look for test failures.

run-tests: --interactive and --jobs no longer conflict

run-tests: sort certain slow tests earlier by keyword There are a few tests that evade the size heuristic

run-tests: drop unused resultslock

run-tests: drop options.child and users

run-tests: remove runchildren, now unused

run-tests: schedule largest tests first

run-tests: introduce thread scheduler

run-tests: use count to calculate port to use This will keep threads from using the same server ports

run-tests: introduce threadtmp directory

run-tests: add abort flag This will be used to help threads clean up gracefully

run-tests: move more variables to env

run-tests: simplify env deletion

run-tests: move most of remaining environment tweaks