setup: handle more invalid python3 syntax This should keep the file portable to both python2 and python3.

revset: changed __add__ methods on lazy sets to return addsets (issue4191) Performance Benchmarking: $ hg --time log --graph --style compact --limit 6 -r 'sort((::. or bookmark() or heads(public())), "-rev")' time: real 1.540 secs (user 1.510+0.000 sys 0.020+0.000) $ ./hg --time log --graph --style compact --limit 6 -r 'sort((::. or bookmark() or heads(public())), "-rev")' time: real 1.240 secs (user 1.190+0.000 sys 0.040+0.010)

revset: added addset class with its basic methods This class addresses the problem of losing performance on the __contains__ method when adding two smart structures with fast membership testing.

revset: changed _children method to use lazy structures

revset: changed descendants revset to use lazy generators Performance Benchmarking: $ time hg log -qr "0:: and 0:5" ... real 0m3.665s user 0m3.364s sys 0m0.289s $ time ./hg log -qr "0:: and 0:5" ... real 0m0.492s user 0m0.394s sys 0m0.097s

revset: optimized _revancestors method based on order of revisions If the revisions for which the ancestors are required are in descending order, it lazily loads them into a heap to be able to yield values faster.

revset: changed ancestors revset to return lazy generators This will not improve revsets like "::tip" but will do when that gets intersected or substracted with another revset. Performance Benchmarking: $ time hg log -qr "draft() and ::tip" ... real 0m3.961s user 0m3.640s sys 0m0.313s $ time ./hg log -qr "draft() and ::tip" ... real 0m1.080s user 0m0.987s sys 0m0.083s

doc: show short description of each commands in generated documents Before this patch, short description of each commands is not shown in generated documents (HTML file and UNIX man page). This omitting may prevent users from understanding about commands. This patch show it as the 1st paragraph in the help section of each commands. This style is chosen because: - showing it as the section title in "command - short desc" style disallows referencing by "#command" in HTML file: in "en" locale, hyphen concatenated title is used as the section ID in HTML file for this style - showing it as the 1st paragraph in "command - short desc" style seems to be redundant: "command" appears also just before as the section title - showing it just after synopsis like "hg help command" seems not to be reasonable in UNIX man page This patch just writes short description ("d['desc'][0]") before "::", because it should be already "strip()"-ed in "get_desc()", or empty string for the command without description.

check-code: disallow use of dict(key=value) construction {} literals are faster and more consistent across Python 2 and 3. Whitelisted the one use of dict() that is using a generator expresion.

setup.py: move from dict() construction to {} literals The latter are both faster and more consistent across Python 2 and 3.