From dd8fde52d9d62f322df8cb12a0e1adc361baf506 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 25 Oct 2022 16:21:11 -0700
Subject: [PATCH] pkg/objc starting

---
 build.zig          |  2 ++
 pkg/objc/build.zig | 10 ++++++++++
 pkg/objc/c.zig     |  4 ++++
 pkg/objc/class.zig | 20 ++++++++++++++++++++
 pkg/objc/main.zig  |  6 ++++++
 5 files changed, 42 insertions(+)
 create mode 100644 pkg/objc/build.zig
 create mode 100644 pkg/objc/c.zig
 create mode 100644 pkg/objc/class.zig
 create mode 100644 pkg/objc/main.zig

diff --git a/build.zig b/build.zig
index efeeaa189..8bade4c10 100644
--- a/build.zig
+++ b/build.zig
@@ -11,6 +11,7 @@ const libxml2 = @import("vendor/zig-libxml2/libxml2.zig");
 const libuv = @import("pkg/libuv/build.zig");
 const libpng = @import("pkg/libpng/build.zig");
 const macos = @import("pkg/macos/build.zig");
+const objc = @import("pkg/objc/build.zig");
 const stb_image_resize = @import("pkg/stb_image_resize/build.zig");
 const utf8proc = @import("pkg/utf8proc/build.zig");
 const zlib = @import("pkg/zlib/build.zig");
@@ -194,6 +195,7 @@ fn addDeps(
     step.addPackage(imgui.pkg);
     step.addPackage(glfw.pkg);
     step.addPackage(libuv.pkg);
+    step.addPackage(objc.pkg);
     step.addPackage(stb_image_resize.pkg);
     step.addPackage(utf8proc.pkg);
 
diff --git a/pkg/objc/build.zig b/pkg/objc/build.zig
new file mode 100644
index 000000000..a29d90daf
--- /dev/null
+++ b/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 ".";
+}
diff --git a/pkg/objc/c.zig b/pkg/objc/c.zig
new file mode 100644
index 000000000..622ea4bce
--- /dev/null
+++ b/pkg/objc/c.zig
@@ -0,0 +1,4 @@
+pub usingnamespace @cImport({
+    @cInclude("objc/runtime.h");
+    @cInclude("objc/message.h");
+});
diff --git a/pkg/objc/class.zig b/pkg/objc/class.zig
new file mode 100644
index 000000000..2f6d66920
--- /dev/null
+++ b/pkg/objc/class.zig
@@ -0,0 +1,20 @@
+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);
+}
diff --git a/pkg/objc/main.zig b/pkg/objc/main.zig
new file mode 100644
index 000000000..d83e205b2
--- /dev/null
+++ b/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());
+}