69 lines
2.5 KiB
Haskell
69 lines
2.5 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, unpack)
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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 (unpack n)
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prettySetArg (n, Just v) = text (unpack n) <+> text "?" <+> prettyNix v
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prettyFold = foldr ($$) empty
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infixOper :: NExpr -> String -> NExpr -> Doc
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infixOper l op r = prettyNix l <+> text op <+> prettyNix r
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prettyOper :: NOperF NExpr -> Doc
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prettyOper (NNot r) = text "!" <> prettyNix r
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prettyOper (NNeg r) = text "-" <> prettyNix r
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prettyOper (NEq r1 r2) = infixOper r1 "==" r2
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prettyOper (NNEq r1 r2) = infixOper r1 "!=" r2
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prettyOper (NLt r1 r2) = infixOper r1 "<" r2
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prettyOper (NLte r1 r2) = infixOper r1 "<=" r2
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prettyOper (NGt r1 r2) = infixOper r1 ">" r2
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prettyOper (NGte r1 r2) = infixOper r1 ">=" r2
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prettyOper (NAnd r1 r2) = infixOper r1 "&&" r2
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prettyOper (NOr r1 r2) = infixOper r1 "||" r2
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prettyOper (NImpl r1 r2) = infixOper r1 ">" r2
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prettyOper (NUpdate r1 r2) = infixOper r1 "//" r2
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prettyOper (NHasAttr r1 r2) = infixOper r1 "?" r2
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prettyOper (NAttr r1 r2) = prettyNix r1 <> text "." <> prettyNix r2
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prettyOper (NPlus r1 r2) = infixOper r1 "+" r2
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prettyOper (NMinus r1 r2) = infixOper r1 "-" r2
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prettyOper (NMult r1 r2) = infixOper r1 "*" r2
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prettyOper (NDiv r1 r2) = infixOper r1 "/" r2
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prettyOper (NConcat r1 r2) = infixOper r1 "++" r2
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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 $ unpack $ atomText atom
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go (NOper oper) = prettyOper 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"; NonRec -> 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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