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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.
Patrick Mezard - - Load All Authors

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test-template-engine
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#!/bin/sh
cat > engine.py << EOF
from mercurial import templater
class mytemplater(object):
def __init__(self, loader, filters, defaults):
self.loader = loader
def process(self, t, map):
tmpl = self.loader(t)
for k, v in map.iteritems():
if k in ('templ', 'ctx', 'repo', 'revcache', 'cache'):
continue
if hasattr(v, '__call__'):
v = v(**map)
v = templater.stringify(v)
tmpl = tmpl.replace('{{%s}}' % k, v)
yield tmpl
templater.engines['my'] = mytemplater
EOF
hg init test
echo '[extensions]' > test/.hg/hgrc
echo "engine = `pwd`/engine.py" >> test/.hg/hgrc
cd test
cat > mymap << EOF
changeset = my:changeset.txt
EOF
cat > changeset.txt << EOF
{{rev}} {{node}} {{author}}
EOF
hg ci -Ama
hg log --style=./mymap