tests/test-parentrevspec.t

discovery: drop findoutgoing and simplify findcommonincoming's api

This is a long desired cleanup and paves the way for new discovery.
To specify subsets for bundling changes, all code should use the heads
of the desired subset ("heads") and the heads of the common subset
("common") to be excluded from the bundled set. These can be used
revlog.findmissing instead of revlog.nodesbetween.

This fixes an actual bug exposed by the change in test-bundle-r.t
where we try to bundle a changeset while specifying that said changeset
is to be assumed already present in the target. This used to still
bundle the changeset. It no longer does. This is similar to the bugs
fixed by the recent switch to heads/common for incoming/pull.

  $ commit()
  > {
  >     msg=$1
  >     p1=$2
  >     p2=$3
  > 
  >     if [ "$p1" ]; then
  >         hg up -qC $p1
  >     fi
  > 
  >     if [ "$p2" ]; then
  >         HGMERGE=true hg merge -q $p2
  >     fi
  > 
  >     echo >> foo
  > 
  >     hg commit -qAm "$msg"
  > }
  $ hg init repo
  $ cd repo
  $ echo '[extensions]' > .hg/hgrc
  $ echo 'parentrevspec =' >> .hg/hgrc
  $ commit '0: add foo'
  $ commit '1: change foo 1'
  $ commit '2: change foo 2a'
  $ commit '3: change foo 3a'
  $ commit '4: change foo 2b' 1
  $ commit '5: merge' 3 4
  $ commit '6: change foo again'
  $ hg log --template '{rev}:{node|short} {parents}\n'
  6:755d1e0d79e9 
  5:9ce2ce29723a 3:a3e00c7dbf11 4:bb4475edb621 
  4:bb4475edb621 1:5d953a1917d1 
  3:a3e00c7dbf11 
  2:befc7d89d081 
  1:5d953a1917d1 
  0:837088b6e1d9 
  $ echo
  
  $ lookup()
  > {
  >     for rev in "$@"; do
  >         printf "$rev: "
  >         hg id -nr $rev
  >     done
  >     true
  > }
  $ tipnode=`hg id -ir tip`

should work with tag/branch/node/rev

  $ for r in tip default $tipnode 6; do
  >     lookup "$r^"
  > done
  tip^: 5
  default^: 5
  755d1e0d79e9^: 5
  6^: 5
  $ echo
  

some random lookups

  $ lookup "6^^" "6^^^" "6^^^^" "6^^^^^" "6^^^^^^" "6^1" "6^2" "6^^2" "6^1^2" "6^^3"
  6^^: 3
  6^^^: 2
  6^^^^: 1
  6^^^^^: 0
  6^^^^^^: -1
  6^1: 5
  6^2: hg: parse error at 1: syntax error
  6^^2: 4
  6^1^2: 4
  6^^3: hg: parse error at 1: syntax error
  $ lookup "6~" "6~1" "6~2" "6~3" "6~4" "6~5" "6~42" "6~1^2" "6~1^2~2"
  6~: hg: parse error at 1: syntax error
  6~1: 5
  6~2: 3
  6~3: 2
  6~4: 1
  6~5: 0
  6~42: -1
  6~1^2: 4
  6~1^2~2: 0
  $ echo
  

with a tag "6^" pointing to rev 1

  $ hg tag -l -r 1 "6^"
  $ lookup "6^" "6^1" "6~1" "6^^"
  6^: 1
  6^1: 5
  6~1: 5
  6^^: 3
  $ echo
  

with a tag "foo^bar" pointing to rev 2

  $ hg tag -l -r 2 "foo^bar"
  $ lookup "foo^bar" "foo^bar^"
  foo^bar: 2
  foo^bar^: hg: parse error at 3: syntax error