-------------------------------------------------------------------------------- {-# LANGUAGE CPP #-} {-# LANGUAGE GeneralizedNewtypeDeriving #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE RecordWildCards #-} module Patat.Presentation.Display ( displayPresentation , displayPresentationError , dumpPresentation ) where -------------------------------------------------------------------------------- import Control.Applicative ((<$>)) import Control.Monad (mplus, unless) import qualified Data.Aeson.Extended as A import Data.Data.Extended (grecQ) import qualified Data.List as L import Data.Maybe (fromMaybe) import Data.Monoid (mconcat, mempty, (<>)) import qualified Data.Text as T import Patat.Cleanup import qualified Patat.Images as Images 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.ANSI as Ansi import qualified System.Console.Terminal.Size as Terminal import qualified System.IO as IO import qualified Text.Pandoc.Extended as Pandoc -------------------------------------------------------------------------------- data CanvasSize = CanvasSize {csRows :: Int, csCols :: Int} deriving (Show) -------------------------------------------------------------------------------- -- | Display something within the presentation borders that draw the title and -- the active slide number and so on. displayWithBorders :: Presentation -> (CanvasSize -> Theme -> PP.Doc) -> IO Cleanup displayWithBorders Presentation {..} f = do Ansi.clearScreen Ansi.setCursorPosition 0 0 -- Get terminal width/title mbWindow <- Terminal.size let columns = fromMaybe 72 $ (A.unFlexibleNum <$> psColumns pSettings) `mplus` (Terminal.width <$> mbWindow) rows = fromMaybe 24 $ (A.unFlexibleNum <$> psRows pSettings) `mplus` (Terminal.height <$> mbWindow) let settings = pSettings {psColumns = Just $ A.FlexibleNum columns} theme = fromMaybe Theme.defaultTheme (psTheme settings) title = PP.toString (prettyInlines theme pTitle) titleWidth = length title titleOffset = (columns - titleWidth) `div` 2 borders = themed (themeBorders theme) unless (null title) $ do let titleRemainder = columns - titleWidth - titleOffset wrappedTitle = PP.spaces titleOffset <> PP.string title <> PP.spaces titleRemainder PP.putDoc $ borders wrappedTitle putStrLn "" putStrLn "" let canvasSize = CanvasSize (rows - 2) columns PP.putDoc $ formatWith settings $ f canvasSize theme putStrLn "" let (sidx, _) = pActiveFragment active = show (sidx + 1) ++ " / " ++ show (length pSlides) activeWidth = length active author = PP.toString (prettyInlines theme pAuthor) authorWidth = length author middleSpaces = PP.spaces $ columns - activeWidth - authorWidth - 2 Ansi.setCursorPosition (rows - 1) 0 PP.putDoc $ borders $ PP.space <> PP.string author <> middleSpaces <> PP.string active <> PP.space IO.hFlush IO.stdout return mempty -------------------------------------------------------------------------------- displayImage :: Images.Handle -> FilePath -> IO Cleanup displayImage images path = do Ansi.clearScreen Ansi.setCursorPosition 0 0 putStrLn "" IO.hFlush IO.stdout Images.drawImage images path -------------------------------------------------------------------------------- displayPresentation :: Maybe Images.Handle -> Presentation -> IO Cleanup displayPresentation mbImages pres@Presentation {..} = case getActiveFragment pres of Nothing -> displayWithBorders pres mempty Just (ActiveContent fragment) | Just images <- mbImages , Just image <- onlyImage fragment -> displayImage images image Just (ActiveContent fragment) -> displayWithBorders pres $ \_canvasSize theme -> prettyFragment theme fragment Just (ActiveTitle block) -> displayWithBorders pres $ \canvasSize theme -> let pblock = prettyBlock theme block (prows, pcols) = PP.dimensions pblock (mLeft, mRight) = marginsOf pSettings offsetRow = (csRows canvasSize `div` 2) - (prows `div` 2) offsetCol = ((csCols 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 :: Presentation -> String -> IO Cleanup displayPresentationError pres err = displayWithBorders pres $ \_ Theme {..} -> themed themeStrong "Error occurred in the presentation:" <$$> "" <$$> (PP.string err) -------------------------------------------------------------------------------- dumpPresentation :: Presentation -> IO () dumpPresentation pres = let settings = pSettings pres theme = fromMaybe Theme.defaultTheme (psTheme $ settings) in PP.putDoc $ formatWith settings $ PP.vcat $ L.intersperse "----------" $ do slide <- pSlides pres return $ case slide of TitleSlide block -> "~~~title" <$$> prettyBlock theme block ContentSlide fragments -> PP.vcat $ L.intersperse "~~~frag" $ do fragment <- fragments return $ prettyFragment theme fragment -------------------------------------------------------------------------------- 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@(Fragment blocks) = prettyBlocks theme blocks <> case prettyReferences theme fragment 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.string 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 aligns _ headers rows) = 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 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.string 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 {..} (Pandoc.Code _ txt) = themed themeCode $ PP.string (" " <> txt <> " ") prettyInline theme@Theme {..} link@(Pandoc.Link _attrs text (target, _title)) | isReferenceLink link = "[" <> themed themeLinkText (prettyInlines theme text) <> "]" | otherwise = "<" <> themed themeLinkTarget (PP.string 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.string t) prettyInline theme@Theme {..} (Pandoc.Image _attrs text (target, _title)) = "![" <> themed themeImageText (prettyInlines theme text) <> "](" <> themed themeImageTarget (PP.string 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.string 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 -> Fragment -> [PP.Doc] prettyReferences theme@Theme {..} = map prettyReference . getReferences . unFragment 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.string target) <> (if null title then mempty else PP.space <> "\"" <> PP.string 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 ("" `L.isSuffixOf` t) isVisibleBlock _ = True