add haiku support (#88)

* add haiku support

* run cargo fmt

* update note on BDirectWindow

Co-authored-by: Al Hoang <3811822-hoanga@users.noreply.gitlab.com>

src/haiku.rs

@@ -0,0 +1,28 @@
+use core::ffi::c_void;
+use core::ptr;
+
+/// Raw window handle for Haiku.
+///
+/// ## Construction
+/// ```
+/// # use raw_window_handle::HaikuHandle;
+/// let mut handle = HaikuHandle::empty();
+/// /* set fields */
+/// ```
+#[non_exhaustive]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct HaikuHandle {
+    /// A pointer to a BWindow object
+    pub b_window: *mut c_void,
+    /// A pointer to a BDirectWindow object that might be null
+    pub b_direct_window: *mut c_void,
+}
+
+impl HaikuHandle {
+    pub fn empty() -> Self {
+        Self {
+            b_window: ptr::null_mut(),
+            b_direct_window: ptr::null_mut(),
+        }
+    }
+}

src/lib.rs

@@ -1,5 +1,4 @@
 #![no_std]
-
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
 //! Interoperability library for Rust Windowing applications.
@@ -25,6 +24,7 @@ extern crate alloc;
 
 mod android;
 mod appkit;
+mod haiku;
 mod redox;
 mod uikit;
 mod unix;
@@ -33,6 +33,7 @@ mod windows;
 
 pub use android::AndroidNdkHandle;
 pub use appkit::AppKitHandle;
+pub use haiku::HaikuHandle;
 pub use redox::OrbitalHandle;
 pub use uikit::UiKitHandle;
 pub use unix::{WaylandHandle, XcbHandle, XlibHandle};
@@ -154,4 +155,9 @@ pub enum RawWindowHandle {
     /// ## Availability Hints
     /// This variant is used on Android targets.
     AndroidNdk(AndroidNdkHandle),
+    /// A raw window handle for Haiku.
+    ///
+    /// ## Availability Hints
+    /// This variant is used on HaikuOS.
+    Haiku(HaikuHandle),
 }