-------------------------------------------------------------------------------- {-# LANGUAGE CPP #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE RecordWildCards #-} module Patat.Presentation.Display ( Size , getDisplaySize , Display (..) , displayPresentation , displayPresentationError , dumpPresentation ) where -------------------------------------------------------------------------------- import Control.Monad (mplus) import qualified Data.Aeson.Extended as A import Data.Char.WCWidth.Extended (wcstrwidth) import Data.Data.Extended (grecQ) import qualified Data.List as L import Data.Maybe (fromMaybe, listToMaybe, maybeToList) import qualified Data.Text as T import Patat.Presentation.Display.CodeBlock import Patat.Presentation.Display.Table import Patat.Presentation.Internal import Patat.PrettyPrint ((<$$>), (<+>)) import qualified Patat.PrettyPrint as PP import Patat.Theme (Theme (..)) import qualified Patat.Theme as Theme import Prelude import qualified System.Console.Terminal.Size as Terminal import qualified Text.Pandoc.Extended as Pandoc import qualified Text.Pandoc.Writers.Shared as Pandoc -------------------------------------------------------------------------------- data Size = Size {sRows :: Int, sCols :: Int} deriving (Show) -------------------------------------------------------------------------------- getDisplaySize :: Presentation -> IO Size getDisplaySize Presentation {..} = do mbWindow <- Terminal.size let sRows = fromMaybe 24 $ (A.unFlexibleNum <$> psRows pSettings) `mplus` (Terminal.height <$> mbWindow) sCols = fromMaybe 72 $ (A.unFlexibleNum <$> psColumns pSettings) `mplus` (Terminal.width <$> mbWindow) pure $ Size {..} -------------------------------------------------------------------------------- data Display = DisplayDoc PP.Doc | DisplayImage FilePath deriving (Show) -------------------------------------------------------------------------------- -- | Display something within the presentation borders that draw the title and -- the active slide number and so on. displayWithBorders :: Size -> Presentation -> (Size -> Theme -> PP.Doc) -> PP.Doc displayWithBorders (Size rows columns) Presentation {..} f = (if null title then mempty else let titleRemainder = columns - titleWidth - titleOffset wrappedTitle = PP.spaces titleOffset <> PP.string title <> PP.spaces titleRemainder in borders wrappedTitle <> PP.hardline <> PP.hardline) <> formatWith settings (f canvasSize theme) <> PP.hardline <> PP.goToLine (rows - 2) <> borders (PP.space <> PP.string author <> middleSpaces <> PP.string active <> PP.space) <> PP.hardline where -- Get terminal width/title (sidx, _) = pActiveFragment settings = pSettings {psColumns = Just $ A.FlexibleNum columns} theme = fromMaybe Theme.defaultTheme (psTheme settings) -- Compute title. breadcrumbs = fromMaybe [] . listToMaybe $ drop sidx pBreadcrumbs plainTitle = PP.toString $ prettyInlines theme pTitle breadTitle = mappend plainTitle $ mconcat [ s | b <- map (prettyInlines theme . snd) breadcrumbs , s <- [" > ", PP.toString b] ] title | not . fromMaybe True $ psBreadcrumbs settings = plainTitle | wcstrwidth breadTitle > columns = plainTitle | otherwise = breadTitle -- Dimensions of title. titleWidth = wcstrwidth title titleOffset = (columns - titleWidth) `div` 2 borders = themed (themeBorders theme) -- Room left for content canvasSize = Size (rows - 2) columns -- Compute footer. active | fromMaybe True $ psSlideNumber settings = show (sidx + 1) ++ " / " ++ show (length pSlides) | otherwise = "" activeWidth = wcstrwidth active author = PP.toString (prettyInlines theme pAuthor) authorWidth = wcstrwidth author middleSpaces = PP.spaces $ columns - activeWidth - authorWidth - 2 -------------------------------------------------------------------------------- displayPresentation :: Size -> Presentation -> Display displayPresentation size pres@Presentation {..} = case getActiveFragment pres of Nothing -> DisplayDoc $ displayWithBorders size pres mempty Just (ActiveContent fragment) | Just _ <- psImages pSettings , Just image <- onlyImage fragment -> DisplayImage $ T.unpack image Just (ActiveContent fragment) -> DisplayDoc $ displayWithBorders size pres $ \_canvasSize theme -> prettyFragment theme fragment Just (ActiveTitle block) -> DisplayDoc $ displayWithBorders size pres $ \canvasSize theme -> let pblock = prettyBlock theme block (prows, pcols) = PP.dimensions pblock (mLeft, mRight) = marginsOf pSettings offsetRow = (sRows canvasSize `div` 2) - (prows `div` 2) offsetCol = ((sCols canvasSize - mLeft - mRight) `div` 2) - (pcols `div` 2) spaces = PP.NotTrimmable $ PP.spaces offsetCol in mconcat (replicate (offsetRow - 3) PP.hardline) <$$> PP.indent spaces spaces pblock where -- Check if the fragment consists of just a single image, or a header and -- some image. onlyImage (Fragment blocks) | [Pandoc.Para para] <- filter isVisibleBlock blocks , [Pandoc.Image _ _ (target, _)] <- para = Just target onlyImage (Fragment blocks) | [Pandoc.Header _ _ _, Pandoc.Para para] <- filter isVisibleBlock blocks , [Pandoc.Image _ _ (target, _)] <- para = Just target onlyImage _ = Nothing -------------------------------------------------------------------------------- -- | Displays an error in the place of the presentation. This is useful if we -- want to display an error but keep the presentation running. displayPresentationError :: Size -> Presentation -> String -> PP.Doc displayPresentationError size pres err = displayWithBorders size pres $ \_ Theme {..} -> themed themeStrong "Error occurred in the presentation:" <$$> "" <$$> (PP.string err) -------------------------------------------------------------------------------- dumpPresentation :: Presentation -> IO () dumpPresentation pres@Presentation {..} = let sRows = fromMaybe 24 $ A.unFlexibleNum <$> psRows pSettings sCols = fromMaybe 72 $ A.unFlexibleNum <$> psColumns pSettings size = Size {..} in PP.putDoc $ PP.removeControls $ formatWith pSettings $ PP.vcat $ L.intersperse "----------" $ do i <- [0 .. length pSlides - 1] slide <- maybeToList $ getSlide i pres j <- [0 .. numFragments slide - 1] case displayPresentation size pres {pActiveFragment = (i, j)} of DisplayDoc doc -> [doc] DisplayImage _ -> [] -------------------------------------------------------------------------------- formatWith :: PresentationSettings -> PP.Doc -> PP.Doc formatWith ps = wrap . indent where (marginLeft, marginRight) = marginsOf ps wrap = case (psWrap ps, psColumns ps) of (Just True, Just (A.FlexibleNum col)) -> PP.wrapAt (Just $ col - marginRight) _ -> id spaces = PP.NotTrimmable $ PP.spaces marginLeft indent = PP.indent spaces spaces -------------------------------------------------------------------------------- prettyFragment :: Theme -> Fragment -> PP.Doc prettyFragment theme (Fragment blocks) = prettyBlocks theme blocks <> case prettyReferences theme blocks of [] -> mempty refs -> PP.hardline <> PP.vcat refs -------------------------------------------------------------------------------- prettyBlock :: Theme -> Pandoc.Block -> PP.Doc prettyBlock theme (Pandoc.Plain inlines) = prettyInlines theme inlines prettyBlock theme (Pandoc.Para inlines) = prettyInlines theme inlines <> PP.hardline prettyBlock theme@Theme {..} (Pandoc.Header i _ inlines) = themed themeHeader (PP.string (replicate i '#') <+> prettyInlines theme inlines) <> PP.hardline prettyBlock theme (Pandoc.CodeBlock (_, classes, _) txt) = prettyCodeBlock theme classes txt prettyBlock theme (Pandoc.BulletList bss) = PP.vcat [ PP.indent (PP.NotTrimmable $ themed (themeBulletList theme) prefix) (PP.Trimmable " ") (prettyBlocks theme' bs) | bs <- bss ] <> PP.hardline where prefix = " " <> PP.string [marker] <> " " marker = case T.unpack <$> themeBulletListMarkers theme of Just (x : _) -> x _ -> '-' -- Cycle the markers. theme' = theme { themeBulletListMarkers = (\ls -> T.drop 1 ls <> T.take 1 ls) <$> themeBulletListMarkers theme } prettyBlock theme@Theme {..} (Pandoc.OrderedList _ bss) = PP.vcat [ PP.indent (PP.NotTrimmable $ themed themeOrderedList $ PP.string prefix) (PP.Trimmable " ") (prettyBlocks theme bs) | (prefix, bs) <- zip padded bss ] <> PP.hardline where padded = [n ++ replicate (4 - length n) ' ' | n <- numbers] numbers = [ show i ++ "." | i <- [1 .. length bss] ] prettyBlock _theme (Pandoc.RawBlock _ t) = PP.text t <> PP.hardline prettyBlock _theme Pandoc.HorizontalRule = "---" prettyBlock theme@Theme {..} (Pandoc.BlockQuote bs) = let quote = PP.NotTrimmable (themed themeBlockQuote "> ") in PP.indent quote quote (prettyBlocks theme bs) prettyBlock theme@Theme {..} (Pandoc.DefinitionList terms) = PP.vcat $ map prettyDefinition terms where prettyDefinition (term, definitions) = themed themeDefinitionTerm (prettyInlines theme term) <$$> PP.hardline <> PP.vcat [ PP.indent (PP.NotTrimmable (themed themeDefinitionList ": ")) (PP.Trimmable " ") $ prettyBlocks theme (Pandoc.plainToPara definition) | definition <- definitions ] prettyBlock theme (Pandoc.Table _ caption specs thead tbodies tfoot) = PP.wrapAt Nothing $ prettyTable theme Table { tCaption = prettyInlines theme caption' , tAligns = map align aligns , tHeaders = map (prettyBlocks theme) headers , tRows = map (map (prettyBlocks theme)) rows } where (caption', aligns, _, headers, rows) = Pandoc.toLegacyTable caption specs thead tbodies tfoot align Pandoc.AlignLeft = PP.AlignLeft align Pandoc.AlignCenter = PP.AlignCenter align Pandoc.AlignDefault = PP.AlignLeft align Pandoc.AlignRight = PP.AlignRight prettyBlock theme (Pandoc.Div _attrs blocks) = prettyBlocks theme blocks prettyBlock _theme Pandoc.Null = mempty #if MIN_VERSION_pandoc(1,18,0) -- 'LineBlock' elements are new in pandoc-1.18 prettyBlock theme@Theme {..} (Pandoc.LineBlock inliness) = let ind = PP.NotTrimmable (themed themeLineBlock "| ") in PP.wrapAt Nothing $ PP.indent ind ind $ PP.vcat $ map (prettyInlines theme) inliness #endif -------------------------------------------------------------------------------- prettyBlocks :: Theme -> [Pandoc.Block] -> PP.Doc prettyBlocks theme = PP.vcat . map (prettyBlock theme) . filter isVisibleBlock -------------------------------------------------------------------------------- prettyInline :: Theme -> Pandoc.Inline -> PP.Doc prettyInline _theme Pandoc.Space = PP.space prettyInline _theme (Pandoc.Str str) = PP.text str prettyInline theme@Theme {..} (Pandoc.Emph inlines) = themed themeEmph $ prettyInlines theme inlines prettyInline theme@Theme {..} (Pandoc.Strong inlines) = themed themeStrong $ prettyInlines theme inlines prettyInline theme@Theme {..} (Pandoc.Underline inlines) = themed themeUnderline $ prettyInlines theme inlines prettyInline Theme {..} (Pandoc.Code _ txt) = themed themeCode $ PP.text (" " <> txt <> " ") prettyInline theme@Theme {..} link@(Pandoc.Link _attrs text (target, _title)) | isReferenceLink link = "[" <> themed themeLinkText (prettyInlines theme text) <> "]" | otherwise = "<" <> themed themeLinkTarget (PP.text target) <> ">" prettyInline _theme Pandoc.SoftBreak = PP.softline prettyInline _theme Pandoc.LineBreak = PP.hardline prettyInline theme@Theme {..} (Pandoc.Strikeout t) = "~~" <> themed themeStrikeout (prettyInlines theme t) <> "~~" prettyInline theme@Theme {..} (Pandoc.Quoted Pandoc.SingleQuote t) = "'" <> themed themeQuoted (prettyInlines theme t) <> "'" prettyInline theme@Theme {..} (Pandoc.Quoted Pandoc.DoubleQuote t) = "'" <> themed themeQuoted (prettyInlines theme t) <> "'" prettyInline Theme {..} (Pandoc.Math _ t) = themed themeMath (PP.text t) prettyInline theme@Theme {..} (Pandoc.Image _attrs text (target, _title)) = "![" <> themed themeImageText (prettyInlines theme text) <> "](" <> themed themeImageTarget (PP.text target) <> ")" -- These elements aren't really supported. prettyInline theme (Pandoc.Cite _ t) = prettyInlines theme t prettyInline theme (Pandoc.Span _ t) = prettyInlines theme t prettyInline _theme (Pandoc.RawInline _ t) = PP.text t prettyInline theme (Pandoc.Note t) = prettyBlocks theme t prettyInline theme (Pandoc.Superscript t) = prettyInlines theme t prettyInline theme (Pandoc.Subscript t) = prettyInlines theme t prettyInline theme (Pandoc.SmallCaps t) = prettyInlines theme t -- prettyInline unsupported = PP.ondullred $ PP.string $ show unsupported -------------------------------------------------------------------------------- prettyInlines :: Theme -> [Pandoc.Inline] -> PP.Doc prettyInlines theme = mconcat . map (prettyInline theme) -------------------------------------------------------------------------------- prettyReferences :: Theme -> [Pandoc.Block] -> [PP.Doc] prettyReferences theme@Theme {..} = map prettyReference . getReferences where getReferences :: [Pandoc.Block] -> [Pandoc.Inline] getReferences = filter isReferenceLink . grecQ prettyReference :: Pandoc.Inline -> PP.Doc prettyReference (Pandoc.Link _attrs text (target, title)) = "[" <> themed themeLinkText (prettyInlines theme $ Pandoc.newlineToSpace text) <> "](" <> themed themeLinkTarget (PP.text target) <> (if T.null title then mempty else PP.space <> "\"" <> PP.text title <> "\"") <> ")" prettyReference _ = mempty -------------------------------------------------------------------------------- isReferenceLink :: Pandoc.Inline -> Bool isReferenceLink (Pandoc.Link _attrs text (target, _)) = [Pandoc.Str target] /= text isReferenceLink _ = False -------------------------------------------------------------------------------- isVisibleBlock :: Pandoc.Block -> Bool isVisibleBlock Pandoc.Null = False isVisibleBlock (Pandoc.RawBlock (Pandoc.Format "html") t) = not ("" `T.isSuffixOf` t) isVisibleBlock _ = True