Nix: use CMake for builds instead of Meson

Build using submodules instead of patching the build process and using
Nix derivations of the subprojects.

From this commit on, you'll have to change the Hyprland flake url to
`git+https://github.com/hyprwm/Hyprland?submodules=1`

nix/default.nix

@@ -4,10 +4,12 @@
   pkg-config,
   pkgconf,
   makeWrapper,
+  cmake,
   meson,
   ninja,
   binutils,
   cairo,
+  expat,
   git,
   hyprcursor,
   hyprland-protocols,
@@ -19,19 +21,19 @@
   libexecinfo,
   libinput,
   libuuid,
-  libxcb,
   libxkbcommon,
   mesa,
   pango,
   pciutils,
+  python3,
   systemd,
   tomlplusplus,
   udis86,
   wayland,
   wayland-protocols,
   wayland-scanner,
-  wlroots-hyprland,
-  xcbutilwm,
+  wlroots,
+  xorg,
   xwayland,
   debug ? false,
   enableXWayland ? true,
@@ -48,9 +50,7 @@
 }:
 assert lib.assertMsg (!nvidiaPatches) "The option `nvidiaPatches` has been removed.";
 assert lib.assertMsg (!enableNvidiaPatches) "The option `enableNvidiaPatches` has been removed.";
-assert lib.assertMsg (!hidpiXWayland) "The option `hidpiXWayland` has been removed. Please refer https://wiki.hyprland.org/Configuring/XWayland"; let
-  wlr = wlroots-hyprland.override {inherit enableXWayland;};
-in
+assert lib.assertMsg (!hidpiXWayland) "The option `hidpiXWayland` has been removed. Please refer https://wiki.hyprland.org/Configuring/XWayland";
   stdenv.mkDerivation {
     pname = "hyprland${lib.optionalString debug "-debug"}";
     inherit version;
@@ -63,11 +63,6 @@ in
       src = lib.cleanSource ../.;
     };
 
-    patches = [
-      # make meson use the provided wlroots instead of the git submodule
-      ./patches/meson-build.patch
-    ];
-
     postPatch = ''
       # Fix hardcoded paths to /usr installation
       sed -i "s#/usr#$out#" src/render/OpenGL.cpp
@@ -91,9 +86,11 @@ in
       hyprwayland-scanner
       jq
       makeWrapper
+      cmake
       meson
       ninja
       pkg-config
+      python3
       wayland-scanner
     ];
 
@@ -103,10 +100,12 @@ in
       "dev"
     ];
 
-    buildInputs =
-      wlr.buildInputs
-      ++ [
+    buildInputs = lib.concatLists [
+      wlroots.buildInputs
+      udis86.buildInputs
+      [
         cairo
+        expat
         git
         hyprcursor.dev
         hyprland-protocols
@@ -120,31 +119,32 @@ in
         pango
         pciutils
         tomlplusplus
-        udis86
         wayland
         wayland-protocols
-        wlr
       ]
-      ++ lib.optionals stdenv.hostPlatform.isMusl [libexecinfo]
-      ++ lib.optionals enableXWayland [libxcb xcbutilwm xwayland]
-      ++ lib.optionals withSystemd [systemd];
+      (lib.optionals stdenv.hostPlatform.isMusl [libexecinfo])
+      (lib.optionals enableXWayland [
+        xorg.libxcb
+        xorg.libXdmcp
+        xorg.xcbutil
+        xorg.xcbutilwm
+        xwayland
+      ])
+      (lib.optionals withSystemd [systemd])
+    ];
 
-    mesonBuildType =
+    cmakeBuildType =
       if debug
-      then "debug"
-      else "release";
+      then "Debug"
+      else "RelWithDebInfo";
 
-    mesonAutoFeatures = "disabled";
-
-    mesonFlags = [
-      (lib.mesonEnable "xwayland" enableXWayland)
-      (lib.mesonEnable "legacy_renderer" legacyRenderer)
-      (lib.mesonEnable "systemd" withSystemd)
+    cmakeFlags = [
+      (lib.cmakeBool "NO_XWAYLAND" (!enableXWayland))
+      (lib.cmakeBool "LEGACY_RENDERER" legacyRenderer)
+      (lib.cmakeBool "NO_SYSTEMD" (!withSystemd))
     ];
 
     postInstall = ''
-      ln -s ${wlr}/include/wlr $dev/include/hyprland/wlroots
-
       ${lib.optionalString wrapRuntimeDeps ''
         wrapProgram $out/bin/Hyprland \
           --suffix PATH : ${lib.makeBinPath [
@@ -161,7 +161,7 @@ in
       homepage = "https://github.com/hyprwm/Hyprland";
       description = "A dynamic tiling Wayland compositor that doesn't sacrifice on its looks";
       license = licenses.bsd3;
-      platforms = wlr.meta.platforms;
+      platforms = wlroots.meta.platforms;
       mainProgram = "Hyprland";
     };
   }