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Programming language: Haskell
License: GNU Lesser General Public License v2.1 only
Tags: Development     Bindings     Gi     Scientific    
Latest version: v3.0.27

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Generate Haskell bindings for GObject Introspection capable libraries.


To compile the bindings generated by haskell-gi, make sure that you have installed the necessary development packages for the libraries you are interested in. The following are examples for some common distributions. (If your distribution is not listed please send a pull request!)


sudo dnf install gobject-introspection-devel webkitgtk4-devel gtksourceview3-devel

Debian / Ubuntu

sudo apt-get install libgirepository1.0-dev libwebkit2gtk-4.0-dev libgtksourceview-3.0-dev

Arch Linux

sudo pacman -S gobject-introspection gobject-introspection-runtime gtksourceview3 webkit2gtk


Install Homebrew and install GTK+ and GObject Introspection:

brew install gobject-introspection gtk+ gtk+3

Ensure the path to libffi (probably /usr/local/opt/libffi/lib/pkgconfig) is in the PKG_CONFIG_PATH environment variable.


Please see here for detailed installation instructions in Windows.

Using the generated bindings

The most recent versions of the generated bindings are available from hackage. To install, start by making sure that you have a recent (2.0 or later) version of cabal-install, for instance:

$ cabal install cabal-install
$ cabal --version
cabal-install version
compiled using version of the Cabal library

Here is an example "Hello World" program:

{-# LANGUAGE OverloadedStrings, OverloadedLabels #-}
{- cabal:
build-depends: base, haskell-gi-base, gi-gtk == 3.0.*

import qualified GI.Gtk as Gtk
import Data.GI.Base

main :: IO ()
main = do
  Gtk.init Nothing

  win <- new Gtk.Window [ #title := "Hi there" ]

  on win #destroy Gtk.mainQuit

  button <- new Gtk.Button [ #label := "Click me" ]

  on button #clicked (set button [ #sensitive := False,
                                   #label := "Thanks for clicking me" ])

  #add win button

  #showAll win


This program uses the new OverloadedLabels extension in GHC 8.0, so make sure you have a recent enough version of GHC installed. To run this program, copy it to a file (hello.hs, say), and then

$ cabal v2-run hello.hs

For a more involved example, see for instance this WebKit example. Further documentation can be found in the Wiki.

Translating from the C API to the haskell-gi generated API

The translation from the original C API to haskell-gi is fairly straightforward: for method names simply remove the library prefix (gtk, gdk, etc.), and convert to camelCase. I.e. gtk_widget_show becomes widgetShow in the module GI.Gtk (provided by the gi-gtk package).

For properties, add the type of the object as a prefix: so the sensitive property of GtkWidget becomes widgetSensitive in gi-gtk. These can be set using the new syntax, as follows:

b <- new Button [widgetSensitive := True]

or using set after having created the button

b `set` [widgetSensitive := False]

Alternatively you can use setWidgetSensitive and friends to set properties individually if you don't like the list syntax.

Finally, for signals you want to use the onTypeSignalName functions, for example onButtonClicked:

onButtonClicked b $ do ...

This is the basic dictionary. Note that all the resulting symbols can be conveniently searched in hoogle.

There is also support for the OverloadedLabels extension in GHC 8.0 or higher. So the examples above can be shortened (by omitting the type that introduces the signal/property/method) to

b <- new Button [#sensitive := True]
on b #clicked $ do ...
#show b

Hopefully this helps to get started! For any further questions there is a gitter channel that may be helpful at https://gitter.im/haskell-gi/haskell-gi.

Binding to new libraries

It should be rather easy to generate bindings to any library with gobject-introspection support, see the examples in the bindings folder. Pull requests appreciated!

Higher-Level Bindings

The bindings in haskell-gi aim for complete coverage of the bound APIs, but as a result they are imperative in flavour. For nicer, higher-level approaches based on these bindings, see:

Other Resources

Join the chat at https://gitter.im/haskell-gi/haskell-gi Linux CI