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This function appears to be exponential with input length.
#!/bin/sh
echo "[extensions]" >> $HGRCPATH
echo "hgext.convert = " >> $HGRCPATH
echo "[convert]" >> $HGRCPATH
echo "hg.tagsbranch=0" >> $HGRCPATH
hg init source
cd source
echo a > a
hg ci -qAm adda
# Add a merge with one parent in the same branch
echo a >> a
hg ci -qAm changea
hg up -qC 0
hg branch branch0
echo b > b
hg ci -qAm addb
hg up -qC
hg merge
hg ci -qm mergeab
hg tag -ql mergeab
cd ..
# Miss perl... sometimes
cat > filter.py <<EOF
import sys, re
r = re.compile(r'^(?:\d+|pulling from)')
sys.stdout.writelines([l for l in sys.stdin if r.search(l)])
EOF
echo % convert
hg convert -v --config convert.hg.clonebranches=1 source dest |
python filter.py
# Add a merge with both parents and child in different branches
cd source
hg branch branch1
echo a > file1
hg ci -qAm c1
hg up -qC mergeab
hg branch branch2
echo a > file2
hg ci -qAm c2
hg merge branch1
hg branch branch3
hg ci -qAm c3
cd ..
echo % incremental conversion
hg convert -v --config convert.hg.clonebranches=1 source dest |
python filter.py