commit: if relevant, tell user their commit message was saved.
(issue1635)
Specifically, if:
1) the user edited the message (it didn't come straight from -m) and
2) the commit was aborted by an exception
then the saved commit message in .hg/last-message.txt could come in handy, so
mention it with a ui.write().
This doesn't help users who manually rollback to amend a changeset:
the fact that the message was saved to .hg/last-message.txt is
invisible in that case.
#!/bin/sh
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status
echo % Test issue 902
hg commit -m "test2"
hg branch test
hg rollback
hg branch
echo '% Test issue 1635 (commit message saved)'
echo '.hg/last-message.txt:'
cat .hg/last-message.txt
echo % Test rollback of hg before issue 902 was fixed
hg commit -m "test3"
hg branch test
rm .hg/undo.branch
hg rollback
hg branch
echo '% rollback by pretxncommit saves commit message (issue 1635)'
echo a >> a
hg --config hooks.pretxncommit=/bin/false commit -m"precious commit message"
echo '.hg/last-message.txt:'
cat .hg/last-message.txt
echo '% same thing, but run $EDITOR'
cat > $HGTMP/editor <<'__EOF__'
#!/bin/sh
echo "another precious commit message" > "$1"
__EOF__
chmod +x $HGTMP/editor
HGEDITOR=$HGTMP/editor hg --config hooks.pretxncommit=/bin/false commit
echo '.hg/last-message.txt:'
cat .hg/last-message.txt