templater: add parsing and expansion rules to process "templatealias" section
The debugtemplate command is updated to show expanded tree, but still the
template engine doesn't support alias expansion. That's why the test says
"parse error" for now.
from __future__ import absolute_import
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, globalvars)
except Exception as inst:
print(repr(inst))