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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-eol
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#!/bin/sh
# Test interactions between mq and patch.eol
echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
cat > makepatch.py <<EOF
f = file('eol.diff', 'wb')
w = f.write
w('test message\n')
w('diff --git a/a b/a\n')
w('--- a/a\n')
w('+++ b/a\n')
w('@@ -1,5 +1,5 @@\n')
w(' a\n')
w('-b\r\n')
w('+y\r\n')
w(' c\r\n')
w(' d\n')
w('-e\n')
w('\ No newline at end of file\n')
w('+z\r\n')
w('\ No newline at end of file\r\n')
EOF
cat > cateol.py <<EOF
import sys
for line in file(sys.argv[1], 'rb'):
line = line.replace('\r', '<CR>')
line = line.replace('\n', '<LF>')
print line
EOF
hg init repo
cd repo
echo '\.diff' > .hgignore
echo '\.rej' >> .hgignore
# Test different --eol values
python -c 'file("a", "wb").write("a\nb\nc\nd\ne")'
hg ci -Am adda
python ../makepatch.py
hg qimport eol.diff
echo % should fail in strict mode
hg qpush
hg qpop
echo % invalid eol
hg --config patch.eol='LFCR' qpush
hg qpop
echo % force LF
hg --config patch.eol='CRLF' qpush
hg qrefresh
python ../cateol.py .hg/patches/eol.diff
python ../cateol.py a
hg qpop
echo % push again forcing LF and compare revisions
hg --config patch.eol='CRLF' qpush
python ../cateol.py a
hg qpop
echo % push again without LF and compare revisions
hg qpush
python ../cateol.py a
hg qpop