--------------------------------------------------------------------------------
-- | Displaying code blocks, optionally with syntax highlighting.
{-# LANGUAGE OverloadedStrings #-}
module Patat.Presentation.Display.CodeBlock
    ( prettyCodeBlock
    ) where


--------------------------------------------------------------------------------
import           Data.Maybe                          (mapMaybe)
import qualified Data.Text                           as T
import           Patat.Presentation.Display.Internal
import qualified Patat.PrettyPrint                   as PP
import           Patat.Theme
import           Prelude
import qualified Skylighting                         as Skylighting


--------------------------------------------------------------------------------
highlight
    :: Skylighting.SyntaxMap -> [T.Text] -> T.Text -> [Skylighting.SourceLine]
highlight :: SyntaxMap -> [Text] -> Text -> [SourceLine]
highlight SyntaxMap
extraSyntaxMap [Text]
classes Text
rawCodeBlock =
    case forall a b. (a -> Maybe b) -> [a] -> [b]
mapMaybe Text -> Maybe Syntax
getSyntax [Text]
classes of
        []        -> Text -> [SourceLine]
zeroHighlight Text
rawCodeBlock
        (Syntax
syn : [Syntax]
_) ->
            case TokenizerConfig -> Syntax -> Text -> Either String [SourceLine]
Skylighting.tokenize TokenizerConfig
config Syntax
syn Text
rawCodeBlock of
                Left  String
_  -> Text -> [SourceLine]
zeroHighlight Text
rawCodeBlock
                Right [SourceLine]
sl -> [SourceLine]
sl
  where
    getSyntax :: T.Text -> Maybe Skylighting.Syntax
    getSyntax :: Text -> Maybe Syntax
getSyntax Text
c = Text -> SyntaxMap -> Maybe Syntax
Skylighting.lookupSyntax Text
c SyntaxMap
syntaxMap

    config :: Skylighting.TokenizerConfig
    config :: TokenizerConfig
config = Skylighting.TokenizerConfig
        { syntaxMap :: SyntaxMap
Skylighting.syntaxMap  = SyntaxMap
syntaxMap
        , traceOutput :: Bool
Skylighting.traceOutput = Bool
False
        }

    syntaxMap :: Skylighting.SyntaxMap
    syntaxMap :: SyntaxMap
syntaxMap = SyntaxMap
extraSyntaxMap forall a. Semigroup a => a -> a -> a
<> SyntaxMap
Skylighting.defaultSyntaxMap


--------------------------------------------------------------------------------
-- | This does fake highlighting, everything becomes a normal token.  That makes
-- things a bit easier, since we only need to deal with one cases in the
-- renderer.
zeroHighlight :: T.Text -> [Skylighting.SourceLine]
zeroHighlight :: Text -> [SourceLine]
zeroHighlight Text
txt =
    [[(TokenType
Skylighting.NormalTok, Text
line)] | Text
line <- Text -> [Text]
T.lines Text
txt]


--------------------------------------------------------------------------------
prettyCodeBlock :: DisplaySettings -> [T.Text] -> T.Text -> PP.Doc
prettyCodeBlock :: DisplaySettings -> [Text] -> Text -> Doc
prettyCodeBlock DisplaySettings
ds [Text]
classes Text
rawCodeBlock =
    [Doc] -> Doc
PP.vcat (forall a b. (a -> b) -> [a] -> [b]
map SourceLine -> Doc
blockified [SourceLine]
sourceLines) forall a. Semigroup a => a -> a -> a
<> Doc
PP.hardline
  where
    sourceLines :: [Skylighting.SourceLine]
    sourceLines :: [SourceLine]
sourceLines =
        [[]] forall a. [a] -> [a] -> [a]
++ SyntaxMap -> [Text] -> Text -> [SourceLine]
highlight (DisplaySettings -> SyntaxMap
dsSyntaxMap DisplaySettings
ds) [Text]
classes Text
rawCodeBlock forall a. [a] -> [a] -> [a]
++ [[]]

    prettySourceLine :: Skylighting.SourceLine -> PP.Doc
    prettySourceLine :: SourceLine -> Doc
prettySourceLine = forall a. Monoid a => [a] -> a
mconcat forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a b. (a -> b) -> [a] -> [b]
map Token -> Doc
prettyToken

    prettyToken :: Skylighting.Token -> PP.Doc
    prettyToken :: Token -> Doc
prettyToken (TokenType
tokenType, Text
str) = DisplaySettings -> (Theme -> Maybe Style) -> Doc -> Doc
themed
        DisplaySettings
ds
        (\Theme
theme -> Theme -> TokenType -> Maybe Style
syntaxHighlight Theme
theme TokenType
tokenType)
        (String -> Doc
PP.string forall a b. (a -> b) -> a -> b
$ Text -> String
T.unpack Text
str)

    sourceLineLength :: Skylighting.SourceLine -> Int
    sourceLineLength :: SourceLine -> Int
sourceLineLength SourceLine
line = forall (t :: * -> *) a. (Foldable t, Num a) => t a -> a
sum [Text -> Int
T.length Text
str | (TokenType
_, Text
str) <- SourceLine
line]

    blockWidth :: Int
    blockWidth :: Int
blockWidth = forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr forall a. Ord a => a -> a -> a
max Int
0 (forall a b. (a -> b) -> [a] -> [b]
map SourceLine -> Int
sourceLineLength [SourceLine]
sourceLines)

    blockified :: Skylighting.SourceLine -> PP.Doc
    blockified :: SourceLine -> Doc
blockified SourceLine
line =
        let len :: Int
len    = SourceLine -> Int
sourceLineLength SourceLine
line
            indent :: Trimmable Doc
indent = forall a. a -> Trimmable a
PP.NotTrimmable Doc
"   " in
        Trimmable Doc -> Trimmable Doc -> Doc -> Doc
PP.indent Trimmable Doc
indent Trimmable Doc
indent forall a b. (a -> b) -> a -> b
$
        DisplaySettings -> (Theme -> Maybe Style) -> Doc -> Doc
themed DisplaySettings
ds Theme -> Maybe Style
themeCodeBlock forall a b. (a -> b) -> a -> b
$
            Doc
" " forall a. Semigroup a => a -> a -> a
<>
            SourceLine -> Doc
prettySourceLine SourceLine
line forall a. Semigroup a => a -> a -> a
<>
            String -> Doc
PP.string (forall a. Int -> a -> [a]
replicate (Int
blockWidth forall a. Num a => a -> a -> a
- Int
len) Char
' ') forall a. Semigroup a => a -> a -> a
<> Doc
" "