Pretty.hs

-- Copyright (c) 2017 Uber Technologies, Inc.
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module Database.Sql.Pretty where

import Database.Sql.Type

import qualified Data.Text.Lazy as TL

import Text.PrettyPrint


renderPretty :: Pretty a => a -> String
renderPretty = render . pretty

class Pretty a where
    pretty :: a -> Doc


dot :: Doc
dot = text "."

instance Pretty (DatabaseName a) where
    pretty (DatabaseName _ name) = text $ TL.unpack name

instance Foldable f => Pretty (QSchemaName f a) where
    pretty (QSchemaName _ _ _ SessionSchema) = empty
    pretty (QSchemaName _ database name NormalSchema) =
        let d = foldMap pretty database
            addDatabase = if isEmpty d then id else ((d <> dot) <>)
         in addDatabase $ text $ TL.unpack name

instance Foldable f => Pretty (QTableName f a) where
    pretty (QTableName _ schema name) =
        let s = foldMap pretty schema
            addSchema = if isEmpty s then id else ((s <> dot) <>)
         in addSchema $ text $ TL.unpack name

instance Foldable f => Pretty (QColumnName f a) where
    pretty (QColumnName _ table name) =
        let t = foldMap pretty table
            addTable = if isEmpty t then id else ((t <> dot) <>)
         in addTable $ text $ TL.unpack name