feat: allow lib use as git-submodule

build.zig

@@ -51,3 +51,27 @@ pub fn build(b: *std.Build) void {
     const test_step = b.step("test", "Run library tests");
     test_step.dependOn(&run_lib_tests.step);
 }
+
+/// `arm32` will expect the depender to supply the `zba-util` library via the package maanger
+pub fn module(b: *std.Build) *std.Build.Module {
+    const bitfield = b.createModule(.{ .source_file = .{ .path = path("/lib/bitfield.zig") }, .dependencies = &.{} });
+
+    const zba_util = b.dependency("zba-util", .{}).module("zba-util");
+
+    return b.createModule(.{
+        .source_file = .{ .path = path("/src/lib.zig") },
+        .dependencies = &.{
+            .{ .name = "zba-util", .module = zba_util },
+            .{ .name = "bitfield", .module = bitfield },
+        },
+    });
+}
+
+// https://github.com/MasterQ32/SDL.zig/blob/4d565b54227b862c1540719e0e21a36d649e87d5/build.zig#L114-L120
+fn path(comptime suffix: []const u8) []const u8 {
+    if (suffix[0] != '/') @compileError("relToPath requires an absolute path!");
+    return comptime blk: {
+        const root_dir = std.fs.path.dirname(@src().file) orelse ".";
+        break :blk root_dir ++ suffix;
+    };
+}