hgmerge: fix diff+patch detection; cleanups
Details:
- actually show help message when no tools are found
- whitespace cleanup (stupid emacs)
- quote more variables
- simplify merge/diff3 error handling
def demandload(scope, modules):
class d:
def __getattr__(self, name):
mod = self.__dict__["mod"]
scope = self.__dict__["scope"]
scope[mod] = __import__(mod, scope, scope, [])
return getattr(scope[mod], name)
for m in modules.split():
dl = d()
dl.mod = m
dl.scope = scope
scope[m] = dl