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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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test-mq-guards
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#!/bin/sh
echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
hg init
hg qinit
echo x > x
hg ci -Ama
hg qnew a.patch
echo a > a
hg add a
hg qrefresh
hg qnew b.patch
echo b > b
hg add b
hg qrefresh
hg qnew c.patch
echo c > c
hg add c
hg qrefresh
hg qpop -a
echo % should fail
hg qguard does-not-exist.patch +bleh
echo % should fail
hg qguard +fail
hg qpush
echo % should guard a.patch
hg qguard +a
echo % should print +a
hg qguard
hg qpop
echo % should fail
hg qpush a.patch
hg qguard a.patch
echo % should push b.patch
hg qpush
hg qpop
echo % test selection of an empty guard
hg qselect ""
hg qselect a
echo % should push a.patch
hg qpush
hg qguard -- c.patch -a
echo % should print -a
hg qguard c.patch
echo % should skip c.patch
hg qpush -a
echo % should display b.patch
hg qtop
hg qguard -n c.patch
echo % should push c.patch
hg qpush -a
hg qpop -a
hg qselect -n
echo % should push all
hg qpush -a
hg qpop -a
hg qguard a.patch +1
hg qguard b.patch +2
hg qselect 1
echo % should push a.patch, not b.patch
hg qpush
hg qpush
hg qpop -a
hg qselect 2
echo % should push b.patch
hg qpush
hg qpush -a
# Used to be an issue with holes in the patch sequence
# So, put one hole on the base and ask for topmost patch.
hg qtop
hg qpop -a
hg qselect 1 2
echo % should push a.patch, b.patch
hg qpush
hg qpush
hg qpop -a
hg qguard -- a.patch +1 +2 -3
hg qselect 1 2 3
echo % list patches and guards
hg qguard -l
echo % list series
hg qseries -v
echo % list guards
hg qselect
echo % should push b.patch
hg qpush
hg qpush -a
hg qselect -n --reapply
echo % guards in series file: +1 +2 -3
hg qselect -s
echo % should show c.patch
hg qapplied
hg qrename a.patch new.patch
echo % should show :
echo % new.patch: +1 +2 -3
echo % b.patch: +2
echo % c.patch: unguarded
hg qguard -l
hg qnew d.patch
hg qpop
echo % should show new.patch and b.patch as Guarded, c.patch as Applied
echo % and d.patch as Unapplied
hg qseries -v
hg qguard d.patch +2
echo % new.patch, b.patch: Guarded. c.patch: Applied. d.patch: Guarded.
hg qseries -v
qappunappv()
{
for command in qapplied "qapplied -v" qunapplied "qunapplied -v"; do
echo % hg $command
hg $command
done
}
hg qpop -a
hg qguard -l
qappunappv
hg qselect 1
qappunappv
hg qpush -a
qappunappv
hg qselect 2
qappunappv
for patch in `hg qseries`; do
echo % hg qapplied $patch
hg qapplied $patch
echo % hg qunapplied $patch
hg qunapplied $patch
done
echo % hg qseries -m: only b.patch should be shown
echo the guards file was not ignored in the past
hg qdelete -k b.patch
hg qseries -m