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Simplify definition of getAttr

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John Wiegley 2018-05-10 00:07:13 -07:00
parent d805fa3627
commit 1d5c0370ae
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1 changed files with 5 additions and 5 deletions
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10
src/Nix/Builtins.hs
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@ -284,11 +284,11 @@ hasContext :: MonadNix e m => m (NValue m) -> m (NValue m)
hasContext =
toNix . not . null . (appEndo ?? []) . snd <=< fromValue @(Text, DList Text)
getAttr :: MonadNix e m => m (NValue m) -> m (NValue m) -> m (NValue m)
getAttr x y = x >>= \x' -> y >>= \y' -> case (x', y') of
(NVStr key _, NVSet aset _) -> attrsetGet key aset >>= force'
(x, y) -> throwError $ ErrorCall $ "Invalid types for builtin.getAttr: "
++ show (x, y)
getAttr :: forall e m. MonadNix e m => m (NValue m) -> m (NValue m) -> m (NValue m)
getAttr x y =
fromValue @Text x >>= \key ->
fromValue @(AttrSet (NThunk m), AttrSet SourcePos) y >>= \(aset, _) ->
attrsetGet key aset >>= force'
unsafeGetAttrPos :: forall e m. MonadNix e m
=> m (NValue m) -> m (NValue m) -> m (NValue m)