$ cat > loop.py <<EOF
  > from mercurial import commands
  > 
  > def loop(ui, loops, **opts):
  >     loops = int(loops)
  >     total = None
  >     if loops >= 0:
  >         total = loops
  >     if opts.get('total', None):
  >         total = int(opts.get('total'))
  >     loops = abs(loops)
  > 
  >     for i in range(loops):
  >         ui.progress('loop', i, 'loop.%d' % i, 'loopnum', total)
  >     ui.progress('loop', None, 'loop.done', 'loopnum', total)
  > 
  > commands.norepo += " loop"
  > 
  > cmdtable = {
  >     "loop": (loop, [('', 'total', '', 'override for total')],
  >              'hg loop LOOPS'),
  > }
  > EOF

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "progress=" >> $HGRCPATH
  $ echo "loop=`pwd`/loop.py" >> $HGRCPATH
  $ echo "[progress]" >> $HGRCPATH
  $ echo  "format = topic bar number" >> $HGRCPATH
  $ echo "assume-tty=1" >> $HGRCPATH
  $ echo "width=60" >> $HGRCPATH

test default params, display nothing because of delay

  $ hg -y loop 3 2>&1 | $TESTDIR/filtercr.py
  
  $ echo "delay=0" >> $HGRCPATH
  $ echo "refresh=0" >> $HGRCPATH

test with delay=0, refresh=0

  $ hg -y loop 3 2>&1 | $TESTDIR/filtercr.py
  
  loop [                                                ] 0/3
  loop [===============>                                ] 1/3
  loop [===============================>                ] 2/3
                                                              \r (esc)

test refresh is taken in account

  $ hg -y --config progress.refresh=100 loop 3 2>&1 | $TESTDIR/filtercr.py
  

test format options 1

  $ hg -y --config 'progress.format=number topic item+2' loop 2 2>&1 \
  > | $TESTDIR/filtercr.py
  
  0/2 loop lo
  1/2 loop lo
                                                              \r (esc)

test format options 2

  $ hg -y --config 'progress.format=number item-3 bar' loop 2 2>&1 \
  > | $TESTDIR/filtercr.py
  
  0/2 p.0 [                                                 ]
  1/2 p.1 [=======================>                         ]
                                                              \r (esc)

test format options and indeterminate progress

  $ hg -y --config 'progress.format=number item bar' loop -- -2 2>&1 \
  > | $TESTDIR/filtercr.py
  
  0 loop.0               [ <=>                              ]
  1 loop.1               [  <=>                             ]
                                                              \r (esc)

make sure things don't fall over if count > total

  $ hg -y loop --total 4 6 2>&1 | $TESTDIR/filtercr.py
  
  loop [                                                ] 0/4
  loop [===========>                                    ] 1/4
  loop [=======================>                        ] 2/4
  loop [===================================>            ] 3/4
  loop [===============================================>] 4/4
  loop [ <=>                                            ] 5/4
                                                              \r (esc)

test immediate progress completion

  $ hg -y loop 0 2>&1 | $TESTDIR/filtercr.py
  

test delay time estimates

  $ cat > mocktime.py <<EOF
  > import os
  > import time
  > 
  > class mocktime(object):
  >     def __init__(self, increment):
  >         self.time = 0
  >         self.increment = increment
  >     def __call__(self):
  >         self.time += self.increment
  >         return self.time
  > 
  > def uisetup(ui):
  >     time.time = mocktime(int(os.environ.get('MOCKTIME', '11')))
  > EOF

  $ echo "[extensions]" > $HGRCPATH
  $ echo "mocktime=`pwd`/mocktime.py" >> $HGRCPATH
  $ echo "progress=" >> $HGRCPATH
  $ echo "loop=`pwd`/loop.py" >> $HGRCPATH
  $ echo "[progress]" >> $HGRCPATH
  $ echo "assume-tty=1" >> $HGRCPATH
  $ echo "delay=25" >> $HGRCPATH
  $ echo "width=60" >> $HGRCPATH

  $ hg -y loop 8 2>&1 | python $TESTDIR/filtercr.py
  
  loop [=========>                                ] 2/8 1m07s
  loop [===============>                            ] 3/8 56s
  loop [=====================>                      ] 4/8 45s
  loop [==========================>                 ] 5/8 34s
  loop [================================>           ] 6/8 23s
  loop [=====================================>      ] 7/8 12s
                                                              \r (esc)

  $ MOCKTIME=10000 hg -y loop 4 2>&1 | python $TESTDIR/filtercr.py
  
  loop [                                                ] 0/4
  loop [=========>                                ] 1/4 8h21m
  loop [====================>                     ] 2/4 5h34m
  loop [==============================>           ] 3/4 2h47m
                                                              \r (esc)

  $ MOCKTIME=1000000 hg -y loop 4 2>&1 | python $TESTDIR/filtercr.py
  
  loop [                                                ] 0/4
  loop [=========>                                ] 1/4 5w00d
  loop [====================>                     ] 2/4 3w03d
  loop [=============================>           ] 3/4 11d14h
                                                              \r (esc)


  $ MOCKTIME=14000000 hg -y loop 4 2>&1 | python $TESTDIR/filtercr.py
  
  loop [                                                ] 0/4
  loop [=========>                                ] 1/4 1y18w
  loop [===================>                     ] 2/4 46w03d
  loop [=============================>           ] 3/4 23w02d
                                                              \r (esc)

Time estimates should not fail when there's no end point:
  $ hg -y loop -- -4 2>&1 | python $TESTDIR/filtercr.py
  
  loop [ <=>                                              ] 2
  loop [  <=>                                             ] 3
                                                              \r (esc)