tests/test-revset-dirstate-parents.t

localrepo: reverse contexts in status

This is a slight tweak to how localrepo.status calculates what files have
changed. By forcing a changectx to be first operator and anything not a
changectx to be the second operator, we can later exploit this to allow
refactoring the status operation as a method of a context object.

Furthermore, this change will speed up 'hg diff --reverse' when used with the
working directory because the code will now hit a fast path without needing to
calculate an unneeded second manifest.

  $ HGENCODING=utf-8
  $ export HGENCODING

  $ try() {
  >   hg debugrevspec --debug $@
  > }

  $ log() {
  >   hg log --template '{rev}\n' -r "$1"
  > }

  $ hg init repo
  $ cd repo

  $ try 'p1()'
  (func
    ('symbol', 'p1')
    None)
  $ try 'p2()'
  (func
    ('symbol', 'p2')
    None)
  $ try 'parents()'
  (func
    ('symbol', 'parents')
    None)

null revision
  $ log 'p1()'
  $ log 'p2()'
  $ log 'parents()'

working dir with a single parent
  $ echo a > a
  $ hg ci -Aqm0
  $ log 'p1()'
  0
  $ log 'tag() and p1()'
  $ log 'p2()'
  $ log 'parents()'
  0
  $ log 'tag() and parents()'

merge in progress
  $ echo b > b
  $ hg ci -Aqm1
  $ hg up -q 0
  $ echo c > c
  $ hg ci -Aqm2
  $ hg merge -q
  $ log 'p1()'
  2
  $ log 'p2()'
  1
  $ log 'tag() and p2()'
  $ log 'parents()'
  1
  2

  $ cd ..