treemanifest: make diff() faster
Containment checking is slower in treemanifest than it is in
manifestdict, making the current diff algorithm O(n log n). By
traversing both treemanifests in parallel, we can make it O(n). More
importantly, once we start lazily loading submanifests, we will be
able to easily skip entire submanifest if they have the same nodeid.
import sys
globalvars = {}
lines = sys.stdin.readlines()
while lines:
l = lines.pop(0)
if l.startswith('SALT'):
print l[:-1]
elif l.startswith('>>> '):
snippet = l[4:]
while lines and lines[0].startswith('... '):
l = lines.pop(0)
snippet += l[4:]
c = compile(snippet, '<heredoc>', 'single')
try:
exec c in globalvars
except Exception, inst:
print repr(inst)