add an ihaskell-display module for displaying matplotlib visualizations

ihaskell-display/ihaskell-matplotlib/IHaskell/Display/Matplotlib.hs

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+module IHaskell.Display.Matplotlib where
+
+import qualified Data.ByteString.Char8 as Char
+import qualified Data.ByteString.UTF8 as BSU
+import qualified Data.Text.Encoding as T.Encoding
+import           System.IO.Temp
+import           System.FilePath ((</>))
+import           Graphics.Matplotlib
+import           IHaskell.Display
+
+instance IHaskellDisplay Matplotlib where
+  display = graphDataDisplayBoth
+
+-- Width and height
+w, h :: Int 
+w = 300
+h = 300
+
+graphDataPNG :: Matplotlib -> IO DisplayData
+graphDataPNG m = do
+  withSystemTempDirectory "ihaskell-matplotlib" $ \tmpdir -> do
+    let path = tmpdir </> "ihaskell-matplotlib.png"
+
+    -- Write the image.
+    res <- file path m
+    case res of
+      Left  _ -> error "Matplotlib could not generate an immage"
+      Right _ -> do
+        -- Read back, and convert to base64.
+        imgData <- Char.readFile path
+        return $ png w h $ base64 imgData
+
+graphDataSVG :: Matplotlib -> IO DisplayData
+graphDataSVG m = do
+  res <- toSvg m
+  case res of
+    Left  s -> error s
+    Right f -> return $ svg $ T.Encoding.decodeUtf8 $ BSU.fromString f
+
+graphDataDisplayBoth :: Matplotlib -> IO Display
+graphDataDisplayBoth fig = do
+    pngDisp <- graphDataPNG fig
+    svgDisp <- graphDataSVG fig
+    return $ Display [pngDisp, svgDisp]

ihaskell-display/ihaskell-matplotlib/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2025 Andrea Rossato andrea.rossato@unitn.it
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

ihaskell-display/ihaskell-matplotlib/Setup.hs

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+import           Distribution.Simple
+
+main = defaultMain

ihaskell-display/ihaskell-matplotlib/ihaskell-matplotlib.cabal

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+-- The name of the package.
+name:                ihaskell-matplotlib
+
+-- The package version.  See the Haskell package versioning policy (PVP)
+-- for standards guiding when and how versions should be incremented.
+-- http://www.haskell.org/haskellwiki/Package_versioning_policy
+-- PVP summary:      +-+------- breaking API changes
+--                   | | +----- non-breaking API additions
+--                   | | | +--- code changes with no API change
+version:             0.1.0.1
+
+-- A short (one-line) description of the package.
+synopsis:            IHaskell display instance for matplotlib (from matplotlib package)
+
+-- A longer description of the package.
+-- description:
+
+-- URL for the project homepage or repository.
+homepage:            http://www.github.com/gibiansky/ihaskell
+
+-- The license under which the package is released.
+license:             MIT
+
+-- The file containing the license text.
+license-file:        LICENSE
+
+-- The package author(s).
+author:              Andrea Rossatoe <andrea.rossato@unitn.it>
+
+-- An email address to which users can send suggestions, bug reports, and
+-- patches.
+maintainer:          Andrea Rossato <andrea.rossato@unitn.it>,
+                     Andrew Gibiansky <andrew.gibiansky@gmail.com>
+
+-- A copyright notice.
+-- copyright:
+
+category:            Development
+
+build-type:          Simple
+
+-- Extra files to be distributed with the package, such as examples or a
+-- README.
+-- extra-source-files:
+
+-- Constraint on the version of Cabal needed to build this package.
+cabal-version:       1.16
+
+library
+  -- Modules exported by the library.
+  exposed-modules:     IHaskell.Display.Matplotlib
+
+  ghc-options:         -O -Wall -Wno-orphans
+
+  -- Other library packages from which modules are imported.
+  build-depends:       base >=4.9 && <5,
+                       bytestring,
+                       utf8-string,
+                       text,
+                       temporary,
+                       filepath,
+                       matplotlib,
+                       ihaskell >= 0.6.2
+
+  -- Directories containing source files.
+  -- hs-source-dirs:
+
+  -- Base language which the package is written in.
+  default-language:    Haskell2010