tests/test-ui-color.py

import: --no-commit should update .hg/last-message.txt

The patch parser goes through all of that trouble extracting the
commit message from the patch file.  It seems such a waste not to
use it.

from hgext import color

# ensure errors aren't buffered
testui = color.colorui()
testui.pushbuffer()
testui.write('buffered\n')
testui.warn('warning\n')
testui.write_err('error\n')
print repr(testui.popbuffer())