I'm currently on the process of generating haskell bindings for astal and its companion libs. Most of them generated fine, but I did come across some issues.

AstalApps:

<property name="app" writable="1" construct="1">
    <type name="GLib.DesktopAppInfo" c:type="GDesktopAppInfo*"/>
</property>

GDesktopAppInfo is part of Gio and not GLib. I couldn't get it to work by changing the type name using overrides. I just removed this property from the bindings for now.

AstalBluetooth

<property name="adapter">
    <type name="GLib.ObjectPath" c:type="char*"/>
</property>

GLib.ObjectPath is a vala thing. renaming the type using overrides works well, but maybe this should be handled in haskell-gi?

AstalNetwork

depends on NetworkManager, which does not have haskell bindings, so they have to be generated first. I tried to generate them, but it has types like 80211ApFlags, which are not valid names in haskell, as they start with a number. They have to be renamed. Do i have to add an override entry for every occurrence in the gir file or is there a better way?

AstalWireplumber

I get this error when trying to build the generated bindings.

GI/AstalWp/Objects/Endpoint.hs:666:42: error:
    • Could not deduce (BoxedEnum AstalWp.Enums.MediaClass)
        arising from a use of ‘B.Properties.getObjectPropertyEnum’
      from the context: (MonadIO m, IsEndpoint o)
        bound by the type signature for:
                   getEndpointMediaClass :: forall (m :: * -> *) o.
                                            (MonadIO m, IsEndpoint o) =>
                                            o -> m AstalWp.Enums.MediaClass
        at GI/AstalWp/Objects/Endpoint.hs:665:1-85
    • In the second argument of ‘($)’, namely
        ‘B.Properties.getObjectPropertyEnum obj "media-class"’
      In the expression:
        liftIO $ B.Properties.getObjectPropertyEnum obj "media-class"
      In an equation for ‘getEndpointMediaClass’:
          getEndpointMediaClass obj
            = liftIO $ B.Properties.getObjectPropertyEnum obj "media-class"
    |
666 | getEndpointMediaClass obj = MIO.liftIO $ B.Properties.getObjectPropertyEnum obj "media-class"
    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The same error is repeated for the AstalWp.Device.device-type and AstalWp.Wp.scale properties, which are enums as well. For now i just removed these properties from the generated bindings. The getter and setter functions for them are still included and it builds fine.
relevant parts of the gir file:

<enumeration name="MediaClass" c:type="AstalWpMediaClass">
    <source-position filename="include/astal/wireplumber/endpoint.h"
        line="23"/>
    <member name="audio_microphone"
        value="0"
        c:identifier="ASTAL_WP_MEDIA_CLASS_AUDIO_MICROPHONE">
    </member>
    <member name="audio_speaker"
        value="1"
        c:identifier="ASTAL_WP_MEDIA_CLASS_AUDIO_SPEAKER">
    </member>
    [...]
</enumeration>

<property name="media-class"
    transfer-ownership="none"
    getter="get_media_class"
    default-value="ASTAL_WP_MEDIA_CLASS_AUDIO_SPEAKER">
    <type name="MediaClass"/>
</property>

I would appreciate any pointers in the right direction.