revset: add hook after tree parsing
This will be useful to execute actions after the tree is parsed and
before the revset returns a match. Finding symbols in the parse tree
will later allow hashes of hidden revisions to work on the command
line without the --hidden flag.
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)