pkg/objc starting

pkg/objc/build.zig

@@ -0,0 +1,10 @@
+const std = @import("std");
+
+pub const pkg = std.build.Pkg{
+    .name = "objc",
+    .source = .{ .path = thisDir() ++ "/main.zig" },
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}

pkg/objc/c.zig

@@ -0,0 +1,4 @@
+pub usingnamespace @cImport({
+    @cInclude("objc/runtime.h");
+    @cInclude("objc/message.h");
+});

pkg/objc/class.zig

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+const std = @import("std");
+const c = @import("c.zig");
+
+pub const Class = struct {
+    value: c.Class,
+
+    /// Returns the class definition of a specified class.
+    pub fn getClass(name: [:0]const u8) ?Class {
+        return Class{
+            .value = c.objc_getClass(name.ptr) orelse return null,
+        };
+    }
+};
+
+test {
+    const testing = std.testing;
+    const NSObject = Class.getClass("NSObject");
+    try testing.expect(NSObject != null);
+    try testing.expect(Class.getClass("NoWay") == null);
+}

pkg/objc/main.zig

@@ -0,0 +1,6 @@
+pub const c = @import("c.zig");
+pub usingnamespace @import("class.zig");
+
+test {
+    @import("std").testing.refAllDecls(@This());
+}