[refactor] pullports again, with StateT + mapM#64
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acl-cqc
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Dec 6, 2024
| pull1Port p = StateT $ \available -> case partition ((== p) . toPort . fst) available of | ||
| ([], _) -> err $ BadPortPull $ "Port not found: " ++ p ++ " in " ++ showFn available | ||
| ([found], remaining) -> pure (found, remaining) | ||
| (_, _) -> err $ AmbiguousPortPull p (showFn available) |
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One can imagine here (_, _) -> showFn available >>= err . AmbiguousPortPull p allowing showFn to use Checking i.e. showWithMetas in #54
croyzor
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Dec 6, 2024
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What's left of the earlier #62, reworked a bit.
StateTcaptures that we both pass the list of available things intopull1Portand then return the reduced version thereof; but rather thanget,putandlift, using theStateTconstructor and reordering the arguments.Then
mapMcaptures that each invocation ofpull1Portreturns a single thing that was pulled, or an error.