Use cfg_aliases crate to make Wayland/X #[cfg(..)] less redundant

Cargo.toml

@@ -23,7 +23,7 @@ thiserror = "1.0.30"
 raw-window-handle = "0.5.0"
 log = "0.4.17"
 
-[target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly", target_os = "netbsd", target_os = "openbsd"))'.dependencies]
+[target.'cfg(all(unix, not(any(target_vendor = "apple", target_os = "android", target_os = "redox"))))'.dependencies]
 nix = { version = "0.26.1", optional = true }
 wayland-backend = { version = "0.1.0", features = ["client_system"], optional = true }
 wayland-client = { version = "0.30.0", optional = true }
@@ -32,7 +32,7 @@ bytemuck = { version = "1.12.3", optional = true }
 x11-dl = { version  = "2.19.1", optional = true }
 x11rb = { version = "0.11.0", features = ["allow-unsafe-code", "dl-libxcb"], optional = true }
 
-[target.'cfg(any(target_os = "dragonfly", target_os = "netbsd", target_os = "openbsd"))'.dependencies]
+[target.'cfg(all(unix, not(any(target_vendor = "apple", target_os = "android", target_os = "redox", target_os = "linux", target_os = "freebsd"))))'.dependencies]
 fastrand = { version = "1.8.0", optional = true }
 
 [target.'cfg(target_os = "windows")'.dependencies.windows-sys]
@@ -55,6 +55,9 @@ features = ["CanvasRenderingContext2d", "Document", "Element", "HtmlCanvasElemen
 [target.'cfg(target_os = "redox")'.dependencies]
 redox_syscall = "0.3"
 
+[build-dependencies]
+cfg_aliases = "0.1.1"
+
 [dev-dependencies]
 instant = "0.1.12"
 winit = "0.27.2"

build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    cfg_aliases::cfg_aliases! {
+        free_unix: { all(unix, not(any(target_vendor = "apple", target_os = "android", target_os = "redox"))) },
+        x11_platform: { all(feature = "x11", free_unix, not(target_arch = "wasm32")) },
+        wayland_platform: { all(feature = "wayland", free_unix, not(target_arch = "wasm32")) },
+    }
+}

src/lib.rs

@@ -10,31 +10,13 @@ extern crate core;
 mod cg;
 #[cfg(target_os = "redox")]
 mod orbital;
-#[cfg(all(
+#[cfg(wayland_platform)]
-    feature = "wayland",
-    any(
-        target_os = "linux",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "netbsd",
-        target_os = "openbsd"
-    )
-))]
 mod wayland;
 #[cfg(target_arch = "wasm32")]
 mod web;
 #[cfg(target_os = "windows")]
 mod win32;
-#[cfg(all(
+#[cfg(x11_platform)]
-    feature = "x11",
-    any(
-        target_os = "linux",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "netbsd",
-        target_os = "openbsd"
-    )
-))]
 mod x11;
 
 mod error;
@@ -84,9 +66,9 @@ macro_rules! make_dispatch {
 }
 
 make_dispatch! {
-    #[cfg(all(feature = "x11", any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly", target_os = "netbsd", target_os = "openbsd")))]
+    #[cfg(x11_platform)]
     X11(x11::X11Impl),
-    #[cfg(all(feature = "wayland", any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly", target_os = "netbsd", target_os = "openbsd")))]
+    #[cfg(wayland_platform)]
     Wayland(wayland::WaylandImpl),
     #[cfg(target_os = "windows")]
     Win32(win32::Win32Impl),
@@ -123,48 +105,21 @@ impl GraphicsContext {
         raw_display_handle: RawDisplayHandle,
     ) -> Result<Self, SoftBufferError> {
         let imple: Dispatch = match (raw_window_handle, raw_display_handle) {
-            #[cfg(all(
+            #[cfg(x11_platform)]
-                feature = "x11",
-                any(
-                    target_os = "linux",
-                    target_os = "freebsd",
-                    target_os = "dragonfly",
-                    target_os = "netbsd",
-                    target_os = "openbsd"
-                )
-            ))]
             (
                 RawWindowHandle::Xlib(xlib_window_handle),
                 RawDisplayHandle::Xlib(xlib_display_handle),
             ) => Dispatch::X11(unsafe {
                 x11::X11Impl::from_xlib(xlib_window_handle, xlib_display_handle)?
             }),
-            #[cfg(all(
+            #[cfg(x11_platform)]
-                feature = "x11",
-                any(
-                    target_os = "linux",
-                    target_os = "freebsd",
-                    target_os = "dragonfly",
-                    target_os = "netbsd",
-                    target_os = "openbsd"
-                )
-            ))]
             (
                 RawWindowHandle::Xcb(xcb_window_handle),
                 RawDisplayHandle::Xcb(xcb_display_handle),
             ) => Dispatch::X11(unsafe {
                 x11::X11Impl::from_xcb(xcb_window_handle, xcb_display_handle)?
             }),
-            #[cfg(all(
+            #[cfg(wayland_platform)]
-                feature = "wayland",
-                any(
-                    target_os = "linux",
-                    target_os = "freebsd",
-                    target_os = "dragonfly",
-                    target_os = "netbsd",
-                    target_os = "openbsd"
-                )
-            ))]
             (
                 RawWindowHandle::Wayland(wayland_window_handle),
                 RawDisplayHandle::Wayland(wayland_display_handle),