$ 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
$ cat > filtercr.py <<EOF
> import sys, re
> for line in sys.stdin:
> line = re.sub(r'\r+[^\n]', lambda m: '\n' + m.group()[-1:], line)
> sys.stdout.write(line)
> print
> EOF
$ echo "[extensions]" >> $HGRCPATH
$ echo "progress=" >> $HGRCPATH
$ echo "loop=`pwd`/loop.py" >> $HGRCPATH
$ echo "[progress]" >> $HGRCPATH
$ echo "assume-tty=1" >> $HGRCPATH
test default params, display nothing because of delay
$ hg -y loop 3 2>&1 | python filtercr.py
$ echo "delay=0" >> $HGRCPATH
$ echo "refresh=0" >> $HGRCPATH
test with delay=0, refresh=0
$ hg -y loop 3 2>&1 | python 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 | python filtercr.py
test format options 1
$ hg -y --config 'progress.format=number topic item+2' loop 2 2>&1 | python 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 | python 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 | python 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 | python 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 | python filtercr.py