holger krekel f43cda9681 implement a new hook type: hook wrappers using a "yield" to distinguish ...

between working at the front and at the end of a hook call chain.
The idea is to make it easier for a plugin to "wrap" a certain hook
call and use context managers, in particular allow a major cleanup of
capturing.

2014-03-14 12:49:35 +01:00

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