allow using system provided wayland-protocols

Author: Techatrix

build.zig

@@ -352,7 +352,25 @@ pub fn build(b: *std.Build) !void {
         else
             null;
 
-        if (b.lazyDependency("wayland_protocols", .{})) |wayland_protocols| {
+        const use_system_wayland_protocols = b.systemIntegrationOption("wayland-protocols", .{});
+
+        const wayland_protocols_dir: ?std.Build.LazyPath = if (use_system_wayland_protocols) blk: {
+            var code: u8 = undefined;
+            const pkgdatadir = if (b.runAllowFail(&[_][]const u8{
+                b.graph.env_map.get("PKG_CONFIG") orelse "pkg-config",
+                "wayland-protocols",
+                "--variable=pkgdatadir",
+            }, &code, .Ignore)) |stdout| stdout else |err| switch (err) {
+                error.ProcessTerminated => return error.PkgConfigCrashed,
+                error.ExecNotSupported => return error.PkgConfigFailed,
+                error.ExitCodeFailure => return error.PkgConfigFailed,
+                error.FileNotFound => return error.PkgConfigNotInstalled,
+                else => return err,
+            };
+            break :blk .{ .cwd_relative = std.mem.trim(u8, pkgdatadir, &std.ascii.whitespace) };
+        } else if (b.lazyDependency("wayland_protocols", .{})) |wayland_protocols| wayland_protocols.path(".") else null;
+
+        if (wayland_protocols_dir) |wayland_protocols| {
             for (
                 [_][]const u8{
                     "staging/xdg-activation/xdg-activation-v1.xml",
@@ -385,14 +403,14 @@ pub fn build(b: *std.Build) !void {
 
                 {
                     run_wayland_scanner1.addArg("client-header");
-                    run_wayland_scanner1.addFileArg(wayland_protocols.path(input_file));
+                    run_wayland_scanner1.addFileArg(wayland_protocols.path(b, input_file));
                     const header_file = run_wayland_scanner1.addOutputFileArg(b.fmt("{s}-client-protocol.h", .{output_filename}));
                     tracy_profiler.root_module.addIncludePath(header_file.dirname());
                 }
 
                 {
                     run_wayland_scanner2.addArg("public-code");
-                    run_wayland_scanner2.addFileArg(wayland_protocols.path(input_file));
+                    run_wayland_scanner2.addFileArg(wayland_protocols.path(b, input_file));
                     const source_file = run_wayland_scanner2.addOutputFileArg(b.fmt("{s}.c", .{output_filename}));
                     tracy_profiler.root_module.addCSourceFile(.{ .file = source_file });
                 }

build.zig.zon.nix

@@ -134,15 +134,6 @@ in
         rev = "9d3d387087d252970923db7f297f681622c4e026";
       };
     }
-    {
-      name = "N-V-__8AAPSiCwBmhGfdDQlw65XlO55QP1pogBUo1ZeGUv_C";
-      path = fetchZigArtifact {
-        name = "wayland_protocols";
-        url = "git+https://gitlab.freedesktop.org/wayland/wayland-protocols.git?ref=1.38#9ac1a0977eea1b2f525e375089131f7d696a74ee";
-        hash = "sha256-64cjsF3uRdhDW3gx4bc3rwJd0tMIKZW20x1yeesvM6o=";
-        rev = "9ac1a0977eea1b2f525e375089131f7d696a74ee";
-      };
-    }
     {
       name = "N-V-__8AADb7TQBhnAapR8-szphSk_8WmU22BY8jadPC_8-d";
       path = fetchZigArtifact {

flake.nix

@@ -53,7 +53,7 @@
                 ++ lib.optionals (stdenv.hostPlatform.isLinux) [libxkbcommon];
               nativeBuildInputs = with pkgs;
                 [zig_hook pkg-config makeWrapper]
-                ++ lib.optionals (stdenv.hostPlatform.isLinux) [wayland-scanner];
+                ++ lib.optionals (stdenv.hostPlatform.isLinux) [wayland-scanner wayland-protocols];
               zigBuildFlags = ["--system" "${deps}"];
 
               postFixup = pkgs.lib.optionalString pkgs.stdenv.hostPlatform.isLinux ''