context: generate filtered manifest efficiently for exact matchers
When the matcher is exact, there's no reason to iterate over the entire
manifest. It's much more efficient to iterate over the list of files instead.
For a repository with approximately 300,000 files, this speeds up
hg log -l10 --patch --follow for a frequently modified file from 16.5 seconds
to 10.5 seconds.
#!/usr/bin/python
from mercurial.ui import ui
from mercurial.localrepo import localrepository
from mercurial.commands import add, commit, status
u = ui()
print '% creating repo'
repo = localrepository(u, '.', create=True)
f = open('test.py', 'w')
try:
f.write('foo\n')
finally:
f.close
print '% add and commit'
add(u, repo, 'test.py')
commit(u, repo, message='*')
status(u, repo, clean=True)
print '% change'
f = open('test.py', 'w')
try:
f.write('bar\n')
finally:
f.close()
# this would return clean instead of changed before the fix
status(u, repo, clean=True, modified=True)