revset: port parsing rule of old-style ranges from scmutil.revrange() The old-style parser will be removed soon.

debugrevspec: pass lookup function to visualize fallback mechanism The next patch will move the exceptional parsing of old-style ranges to revset.tokenize(). This patch will allow us to see the result tree. Note that the parsing result of '-a-b-c-' is incorrect at this changeset. It will be fixed soon.

help: fix typo familar -> familiar

highlight: exit early on textual and unknown files (issue3005) When highlight extension encountered files that pygments didn't recognize, it used to fall back to text lexer. Also, pygments uses TextLexer for .txt files. This lexer is noop by design. On bigger files, however, doing the noop highlighting resulted in noticeable extra CPU work and memory usage: to show a 1 MB text file, hgweb required about 0.7s more (on top of ~3.8s, Q8400) and consumed about 100 MB of RAM more (on top of ~150 MB). Let's just exit the function when it's clear that nothing will be highlighted. Due to how this pygmentize function works (it modifies the template in-place), we can just return from it and everything else will work as if highlight extension wasn't enabled.

histedit: extract a simpler function to process replacement on abort The process replacement is building a full mapping to allow moving bookmarks and creating obsolescence marker. We do not need the full logic for abort so we extract it. It will be useful as abort is missing some data about the replacement and can crash when third party extensions push it a bit too far.

merge with stable

exchange: fix dead assignment The assignment of the value from bundle2.processbundle() to 'r' is unused. It is currently the same as its third argument (if given), and since that argument may eventually go away (according to the method's docstring), let's reassign the return value to 'op' instead to better prepare for that.