tests/test-schemes.t

perf: use a formatter for output

We use a `formatter` object in the perf extensions. This allow the use of
formatted output like json. To avoid adding logic to create a formatter and pass
it around to the timer function in every command, we add a `gettimer` function
in charge of returning a `timer` function as simple as before but embedding an
appropriate formatter.

This new `gettimer` function also return the formatter as it needs to be
explicitly closed at the end of the command.

example output:


  $ hg --config ui.formatjson=True perfvolatilesets visible obsolete
  [
   {
    "comb": 0.02,
    "count": 126,
    "sys": 0.0,
    "title": "obsolete",
    "user": 0.02,
    "wall": 0.0199398994446
   },
   {
    "comb": 0.02,
    "count": 117,
    "sys": 0.0,
    "title": "visible",
    "user": 0.02,
    "wall": 0.0250301361084
   }
  ]

#require serve

  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > schemes=
  > 
  > [schemes]
  > l = http://localhost:$HGPORT/
  > parts = http://{1}:$HGPORT/
  > z = file:\$PWD/
  > EOF
  $ hg init test
  $ cd test
  $ echo a > a
  $ hg ci -Am initial
  adding a

invalid scheme

  $ hg log -R z:z
  abort: no '://' in scheme url 'z:z'
  [255]

http scheme

  $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
  $ cat hg.pid >> $DAEMON_PIDS
  $ hg incoming l://
  comparing with l://
  searching for changes
  no changes found
  [1]

check that {1} syntax works

  $ hg incoming --debug parts://localhost
  using http://localhost:$HGPORT/
  sending capabilities command
  comparing with parts://localhost/
  query 1; heads
  sending batch command
  searching for changes
  all remote heads known locally
  no changes found
  [1]

check that paths are expanded

  $ PWD=`pwd` hg incoming z://
  comparing with z://
  searching for changes
  no changes found
  [1]

errors

  $ cat errors.log

  $ cd ..