move simdutf to a pkg

pkg/simdutf/build.zig

@@ -0,0 +1,62 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const module = b.addModule("simdutf", .{
+        .root_source_file = .{ .path = "main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const lib = b.addStaticLibrary(.{
+        .name = "simdutf",
+        .target = target,
+        .optimize = optimize,
+    });
+    lib.linkLibCpp();
+    lib.addIncludePath(.{ .path = "vendor" });
+    module.addIncludePath(.{ .path = "vendor" });
+
+    if (target.result.isDarwin()) {
+        const apple_sdk = @import("apple_sdk");
+        try apple_sdk.addPaths(b, &lib.root_module);
+        try apple_sdk.addPaths(b, module);
+    }
+
+    var flags = std.ArrayList([]const u8).init(b.allocator);
+    defer flags.deinit();
+    try flags.appendSlice(&.{});
+
+    lib.addCSourceFiles(.{
+        .flags = flags.items,
+        .files = &.{
+            "vendor/simdutf.cpp",
+        },
+    });
+    lib.installHeadersDirectoryOptions(.{
+        .source_dir = .{ .path = "vendor" },
+        .install_dir = .header,
+        .install_subdir = "",
+        .include_extensions = &.{".h"},
+    });
+
+    b.installArtifact(lib);
+
+    {
+        const test_exe = b.addTest(.{
+            .name = "test",
+            .root_source_file = .{ .path = "main.zig" },
+            .target = target,
+            .optimize = optimize,
+        });
+        test_exe.linkLibrary(lib);
+
+        var it = module.import_table.iterator();
+        while (it.next()) |entry| test_exe.root_module.addImport(entry.key_ptr.*, entry.value_ptr.*);
+        const tests_run = b.addRunArtifact(test_exe);
+        const test_step = b.step("test", "Run tests");
+        test_step.dependOn(&tests_run.step);
+    }
+}

pkg/simdutf/build.zig.zon

@@ -0,0 +1,8 @@
+.{
+    .name = "simdutf",
+    .version = "4.0.9",
+    .paths = .{""},
+    .dependencies = .{
+        .apple_sdk = .{ .path = "../apple-sdk" },
+    },
+}