43 lines
1.4 KiB
Haskell
43 lines
1.4 KiB
Haskell
module Nix.Pretty where
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import Text.PrettyPrint.HughesPJ
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import Nix.Types
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import Data.Map (toList)
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import Data.Text (Text)
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prettyBind :: (NExpr, NExpr) -> Doc
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prettyBind (n, v) = prettyNix n <+> equals <+> prettyNix v <> semi
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prettySetArg :: (Text, Maybe NExpr) -> Doc
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prettySetArg (n, Nothing) = text (show n)
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prettySetArg (n, Just v) = text (show n) <+> text "?" <+> prettyNix v
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prettyFold = foldr ($$) empty
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prettyNix :: NExpr -> Doc
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prettyNix (Fix expr) = go expr where
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go (NConstant atom) = text $ show atom
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go (NOper oper) = text $ show oper
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go (NList list) = lbrack <+> (prettyFold $ map prettyNix list) <+> rbrack
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go (NArgSet args) = lbrace <+> (prettyFold $ map prettySetArg $ toList args) <+> rbrace
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go (NSet rec list) =
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(case rec of Rec -> "rec"; otherwise -> empty)
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<+> lbrace <+> (prettyFold $ map prettyBind list) <+> rbrace
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go (NLet binds body) = text "let"
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go (NIf cond trueBody falseBody) =
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text "if" <+> prettyNix cond
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<+> text "then" <+> prettyNix trueBody
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<+> text "else" <+> prettyNix falseBody
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go (NWith scope body) = text "with" <+> prettyNix scope <> semi <+> prettyNix body
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go (NAssert cond body) = text "assert" <+> prettyNix cond <> semi <+> prettyNix body
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go (NInherit attrs) = text "inherit"
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go (NVar e) = prettyNix e
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go (NApp fun arg) = prettyNix fun <+> prettyNix arg
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go (NAbs args body) = (prettyNix args <> colon) $$ prettyNix body
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