fileset: extract language processing part to new module (API) I'll add a couple more functions that work on parsed tree. % wc -l mercurial/fileset*.py 559 mercurial/fileset.py 135 mercurial/filesetlang.py 694 total

fileset: flatten 'or' nodes to unnest unionmatchers This also makes it easier to compile a union of basic patterns into a single regexp pattern.

fileset: flatten arguments list Just prepares for flattening 'or' nodes. This change would have no impact on performance.

debugfileset: add option to show matcher representation

debugfileset: backport --show-stage option from debugrevspec I'll add some static optimizations to fileset.

lfs: remove callstatus property from 'lfs()' fileset It was added at 91aac8e6604d, but is no longer needed since a fileset expression is now compiled into an "open" matcher. See ff5b6fca1082 for details.

rebase: support "history-editing-backup" config option If you don't want to store any backup while rebasing, you can use `history-editing-backup` config option. [ui] history-editing-backup = # True or False Current status of list of commands which supports this config: 1. histedit 2. rebase Differential Revision: https://phab.mercurial-scm.org/D3887

extensions: add detailed loading information This lets you track down what exactly is happening during extension loading, and how long various steps took.

util: create a context manager to handle timing The context manager is pulled out of the timed decorator function, and refactored to provide a stats instance, with added tests.

linelog: fix import statements to pass the import checker on py3 Differential Revision: https://phab.mercurial-scm.org/D4050