$ echo "[extensions]" >> $HGRCPATH

  $ echo "mq=" >> $HGRCPATH

  $ echo "[mq]" >> $HGRCPATH

  $ echo "git=keep" >> $HGRCPATH

  $ echo "[diff]" >> $HGRCPATH

  $ echo "nodates=1" >> $HGRCPATH

init:

  $ hg init repo

  $ cd repo

  $ echo a > a

  $ hg ci -Am adda

  adding a

  $ echo a >> a

  $ hg qnew -f p1

  $ echo b >> a

  $ hg qnew -f p2

  $ echo c >> a

  $ hg qnew -f p3

Fold in the middle of the queue:

  $ hg qpop p1

  popping p3

  popping p2

  now at: p1

  $ hg qdiff

  diff -r 07f494440405 a

  --- a/a

  +++ b/a

  @@ -1,1 +1,2 @@

   a

  +a

  $ hg qfold p2

  $ grep git .hg/patches/p1 && echo 'git patch found!'

  [1]

  $ hg qser

  p1

  p3

  $ hg qdiff

  diff -r 07f494440405 a

  --- a/a

  +++ b/a

  @@ -1,1 +1,3 @@

   a

  +a

  +b

Fold with local changes:

  $ echo d >> a

  $ hg qfold p3

  abort: local changes found, refresh first

  [255]

  $ hg diff -c .

  diff -r 07f494440405 -r ???????????? a (glob)

  --- a/a

  +++ b/a

  @@ -1,1 +1,3 @@

   a

  +a

  +b

  $ hg revert -a --no-backup

  reverting a

Fold git patch into a regular patch, expect git patch:

  $ echo a >> a

  $ hg qnew -f regular

  $ hg cp a aa

  $ hg qnew --git -f git

  $ hg qpop

  popping git

  now at: regular

  $ hg qfold git

  $ cat .hg/patches/regular

  # HG changeset patch

  # Parent ???????????????????????????????????????? (glob)

  diff --git a/a b/a

  --- a/a

  +++ b/a

  @@ -1,3 +1,4 @@

   a

   a

   b

  +a

  diff --git a/a b/aa

  copy from a

  copy to aa

  --- a/a

  +++ b/aa

  @@ -1,3 +1,4 @@

   a

   a

   b

  +a

  $ hg qpop

  popping regular

  now at: p1

  $ hg qdel regular

Fold regular patch into a git patch, expect git patch:

  $ hg cp a aa

  $ hg qnew --git -f git

  $ echo b >> aa

  $ hg qnew -f regular

  $ hg qpop

  popping regular

  now at: git

  $ hg qfold regular

  $ cat .hg/patches/git

  # HG changeset patch

  # Parent ???????????????????????????????????????? (glob)

  diff --git a/a b/aa

  copy from a

  copy to aa

  --- a/a

  +++ b/aa

  @@ -1,3 +1,4 @@

   a

   a

   b

  +b

Test saving last-message.txt:

  $ hg qrefresh -m "original message"

  $ cat > $TESTTMP/commitfailure.py <<EOF

  > from mercurial import util

  > def reposetup(ui, repo):

  >     class commitfailure(repo.__class__):

  >         def commit(self, *args, **kwargs):

  >             raise util.Abort('emulating unexpected abort')

  >     repo.__class__ = commitfailure

  > EOF

  > [extensions]

  > commitfailure = $TESTTMP/commitfailure.py

  > EOF

  $ cat > $TESTTMP/editor.sh << EOF

  > echo "==== before editing"

  > cat \$1

  > echo "===="

  > (echo; echo "test saving last-message.txt") >> \$1

  > EOF

  $ rm -f .hg/last-message.txt

  $ HGEDITOR="sh $TESTTMP/editor.sh" hg qfold -e p3

  refresh interrupted while patch was popped! (revert --all, qpush to recover)

  abort: emulating unexpected abort

  [255]

  $ cat .hg/last-message.txt

  original message

  test saving last-message.txt

  $ cd ..