view tests/test-username-newline @ 10189:e451e599fbcf

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.

#!/bin/sh
#

hg init foo
cd foo
touch a


unset HGUSER
echo "[ui]" >> .hg/hgrc
echo "username= foo" >> .hg/hgrc
echo "          bar1" >> .hg/hgrc

hg ci -Am m

rm .hg/hgrc

HGUSER=`(echo foo; echo bar2)` hg ci -Am m

hg ci -Am m -u "`(echo foo; echo bar3)`"

true