{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes       #-}
{-# LANGUAGE RecordWildCards   #-}
{-|
Module      : $header$
Copyright   : (c) Laurent P René de Cotret, 2020
License     : GNU GPL, version 2 or above
Maintainer  : laurent.decotret@outlook.com
Stability   : internal
Portability : portable

Rendering Graphviz plots code blocks
-}

module Text.Pandoc.Filter.Plot.Renderers.Graphviz (
      graphvizSupportedSaveFormats
    , graphvizCommand
    , graphvizCapture
    , graphvizAvailable
) where

import           Data.Char
import           Text.Pandoc.Filter.Plot.Renderers.Prelude


graphvizSupportedSaveFormats :: [SaveFormat]
graphvizSupportedSaveFormats :: [SaveFormat]
graphvizSupportedSaveFormats = [SaveFormat
PNG, SaveFormat
PDF, SaveFormat
SVG, SaveFormat
JPG, SaveFormat
EPS, SaveFormat
WEBP, SaveFormat
GIF]


graphvizCommand :: OutputSpec -> PlotM Text
graphvizCommand :: OutputSpec -> PlotM Text
graphvizCommand OutputSpec{..} = do
    FilePath
exe <- Toolkit -> PlotM FilePath
executable Toolkit
Graphviz
    let fmt :: FilePath
fmt = (Char -> Char) -> FilePath -> FilePath
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Char -> Char
toLower (FilePath -> FilePath)
-> (FigureSpec -> FilePath) -> FigureSpec -> FilePath
forall b c a. (b -> c) -> (a -> b) -> a -> c
. SaveFormat -> FilePath
forall a. Show a => a -> FilePath
show (SaveFormat -> FilePath)
-> (FigureSpec -> SaveFormat) -> FigureSpec -> FilePath
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FigureSpec -> SaveFormat
saveFormat (FigureSpec -> FilePath) -> FigureSpec -> FilePath
forall a b. (a -> b) -> a -> b
$ FigureSpec
oFigureSpec
    Text -> PlotM Text
forall (m :: * -> *) a. Monad m => a -> m a
return [st|#{exe} -T#{fmt} -o "#{oFigurePath}" "#{oScriptPath}"|]


graphvizAvailable :: PlotM Bool
graphvizAvailable :: PlotM Bool
graphvizAvailable = do
    FilePath
exe <- Toolkit -> PlotM FilePath
executable Toolkit
Graphviz
    Text -> PlotM Bool
commandSuccess [st|#{exe} -?|]


-- Graphviz export is entirely based on command-line arguments

-- so there is no need to modify the script itself.

graphvizCapture :: FigureSpec -> FilePath -> Script
graphvizCapture :: FigureSpec -> FilePath -> Text
graphvizCapture _ _ = Text
forall a. Monoid a => a
mempty