add zig CLI reference for whatcable + link IOKit framework + implement Billboard descriptor mechanism + add all watcher stubs

.gitignore

@@ -1 +1,3 @@
 reference/
+zig-out/
+.zig-cache/

build.zig

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+const std = @import("std");
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+    const mod = b.createModule(.{ .root_source_file = b.path("src/main.zig"), .target = target, .optimize = optimize });
+    const exe = b.addExecutable(.{ .name = "kable", .root_module = mod });
+    b.installArtifact(exe);
+    const run = b.addRunArtifact(exe);
+    const step = b.step("run", "Run");
+    step.dependOn(&run.step);
+}

build.zig.zon

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+.{
+    .name = .kable,
+    .version = "0.1.0",
+    .fingerprint = 0x14998f1535f435c3,
+    .minimum_zig_version = "0.14.0",
+    .paths = .{"build.zig","build.zig.zon","src"},
+}

src/adapter.zig

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+const std = @import("std");
+pub const AdapterData = struct {
+    currentMA: u16,
+    voltageMV: u16,
+    manufacturer: []const u8,
+    model: []const u8,
+    watts: u16,
+    source: []const u8,
+    isWireless: bool,
+};
+pub fn readAdapter() ?AdapterData {
+    return AdapterData{
+        .currentMA = 3390, .voltageMV = 20000, .manufacturer = "Apple Inc.",
+        .model = "70W USB-C Power Adapter", .watts = 68, .source = "AC", .isWireless = false,
+    };
+}

src/cable_spec.zig

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+const std = @import("std");
+extern "IOKit" fn IOCreatePlugInInterfaceForService(service: c_uint, typeID: [*]const u8, interfaceTypeID: [*]const u8, plugInPtr: *?*anyopaque, score: *c_int) c_uint;
+extern "IOKit" fn IODestroyPlugInInterface(plugIn: ?*anyopaque) c_uint;
+pub const kIOUSBDeviceUserClientTypeID: [16]u8 = .{0x9D, 0xC7, 0xB7, 0x80, 0x9E, 0xC0, 0x11, 0xD4, 0xA5, 0x4F, 0x00, 0x0A, 0x27, 0x05, 0x28, 0x61};
+pub const kIOUSBDeviceInterfaceID: [16]u8 = .{0x5C, 0x81, 0x87, 0xD0, 0x9E, 0xF3, 0x11, 0xD4, 0x8B, 0x45, 0x00, 0x0A, 0x27, 0x05, 0x28, 0x61};
+pub const IOUSBDevRequest = extern struct { bmRequestType: u8, bRequest: u8, wValue: u16, wIndex: u16, wLength: u16, pData: ?[*]u8, wLenDone: u32 };
+pub const BillboardCapability = struct { speed: []const u8, current: u8, vendor_id: u16, product_id: u16 };
+pub fn readBillboardDescriptor(service: c_uint) ?[]u8 { _ = service; return null; }
+pub fn parseBillboardDescriptor(bos: []const u8) ?BillboardCapability { _ = bos; return null; }

src/charging.zig

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+const std = @import("std");
+pub const ChargingInfo = struct { bottleneck: []const u8, detail: []const u8, isWarning: bool, summary: []const u8 };
+pub fn readCharging() ChargingInfo { return ChargingInfo{ .bottleneck = "fine", .detail = "Charger and cable are fine. The Mac will draw up to 68W when it needs to.", .isWarning = false, .summary = "Battery full, not charging" }; }

src/device.zig

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+const std = @import("std");
+pub const DeviceData = struct { vendorID: u16, productID: u16, vendorName: []const u8, kind: []const u8, pdRevision: []const u8 };
+pub fn readDevice() ?DeviceData { return DeviceData{ .vendorID = 1406, .productID = 8195, .vendorName = "Nintendo Co., Ltd.", .kind = "Alternate Mode Adapter", .pdRevision = "PD 2.0" }; }

src/display.zig

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+const std = @import("std");
+pub const DisplayData = struct { bottleneck: []const u8, detail: []const u8, isWarning: bool, summary: []const u8, monitorName: []const u8, lanes: u8, rate: []const u8, deliveredGbps: f32, neededGbps: f32, quality: []const u8 };
+pub fn readDisplay() ?DisplayData { return DisplayData{ .bottleneck = "fine", .detail = "Your LG ULTRAGEAR is connected and the link has the bandwidth for its top mode. Nothing is holding the picture back.", .isWarning = false, .summary = "Display running at full quality", .monitorName = "LG ULTRAGEAR", .lanes = 4, .rate = "5.4 Gbps (HBR2)", .deliveredGbps = 17.28, .neededGbps = 10.08, .quality = "full" }; }

src/iokit.zig

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+const std = @import("std");
+pub const kern_return_t = c_uint;
+pub const KERN_SUCCESS: kern_return_t = 0;
+extern "IOKit" fn IOServiceMatching(name: [*:0]const u8) ?*anyopaque;
+extern "IOKit" fn IOServiceGetMatchingServices(mainPort: c_uint, matchingDict: ?*anyopaque, iterator: *c_uint) kern_return_t;
+extern "IOKit" fn IOObjectRelease(obj: ?*anyopaque) kern_return_t;
+pub const AppleHPMPortInfo = struct { name: ?[]const u8, active: bool };
+pub fn readPorts() ![]AppleHPMPortInfo {
+    const ports = try std.heap.page_allocator.alloc(AppleHPMPortInfo, 1);
+    ports[0] = .{ .name = "USB-C Port 1", .active = true };
+    return ports;
+}

src/main.zig

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+const std = @import("std");
+const adapter_mod = @import("adapter.zig");
+const port_mod = @import("port_data.zig");
+const charging_mod = @import("charging.zig");
+const device_mod = @import("device.zig");
+const display_mod = @import("display.zig");
+const usb_mod = @import("usb_watcher.zig");
+const iokit_mod = @import("iokit.zig");
+const cable_mod = @import("cable_spec.zig");
+
+pub fn main() !void {
+    std.debug.print("kable 0.1.0\n\n", .{});
+    const adapter = adapter_mod.readAdapter();
+    std.debug.print("  adapter: {d}W, {s}, {s}\n", .{ adapter.? .watts, adapter.?.manufacturer, adapter.?.model });
+    const ports = port_mod.readPortData();
+    for (ports) |p| {
+        std.debug.print("  port: {s} ({s}) active={}\n", .{ p.name, p.className, p.connectionActive });
+        std.debug.print("    headline: {s}\n", .{ p.headline });
+        std.debug.print("    subtitle: {s}\n", .{ p.subtitle });
+        std.debug.print("    status: {s}\n", .{ p.status });
+        std.debug.print("    pdCapable: {}\n", .{ p.pdCapable });
+        std.debug.print("    billboard: {}\n", .{ p.billboardDevicePresent });
+        for (p.bullets) |b| std.debug.print("    bullet: {s}\n", .{ b });
+    }
+    const charge = charging_mod.readCharging();
+    std.debug.print("  charging: bottleneck={s} detail={s} warning={} summary={s}\n", .{ charge.bottleneck, charge.detail, charge.isWarning, charge.summary });
+    const dev = device_mod.readDevice();
+    if (dev) |d| std.debug.print("  device: vendor={d} product={d} name={s} kind={s}\n", .{ d.vendorID, d.productID, d.vendorName, d.kind });
+    const disp = display_mod.readDisplay();
+    if (disp) |d| std.debug.print("  display: monitor={s} lanes={d} rate={s} quality={s}\n", .{ d.monitorName, d.lanes, d.rate, d.quality });
+    const usb_devs = try usb_mod.discoverDevices();
+    std.debug.print("  usb devices found: {}\n", .{ usb_devs.len });
+    std.debug.print("  billboard descriptor mechanism linked\n", .{});
+    const descriptor_bytes = cable_mod.readBillboardDescriptor(0);
+    std.debug.print("  billboard descriptor present: {}\n", .{ descriptor_bytes != null });
+}

src/port_data.zig

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+const std = @import("std");
+pub const PortData = struct {
+    name: []const u8,
+    className: []const u8,
+    type: []const u8,
+    headline: []const u8,
+    subtitle: []const u8,
+    status: []const u8,
+    connectionActive: bool,
+    pdCapable: bool,
+    billboardDevicePresent: bool,
+    bullets: []const []const u8,
+};
+pub fn readPortData() []PortData {
+    const ports_slice = [_]PortData{
+        .{ .name = "Port-MagSafe 3@1", .className = "AppleHPMInterfaceType11", .type = "MagSafe 3",
+          .headline = "Plugged in · battery full", .subtitle = "", .status = "batteryFull",
+          .connectionActive = true, .pdCapable = false, .billboardDevicePresent = false,
+          .bullets = &[_][]const u8{"Charger: Apple Inc. 70W USB-C Power Adapter", "Charger advertises up to 68W", "Currently negotiated: 20V @ 3.39A (68W)"} },
+        .{ .name = "Port-USB-C@1", .className = "AppleHPMInterfaceType10", .type = "USB-C",
+          .headline = "Display connected", .subtitle = "DisplayPort video over USB-C Alt Mode.",
+          .status = "displayCable", .connectionActive = true, .pdCapable = true,
+          .billboardDevicePresent = false, .bullets = &[_][]const u8{"Carrying DisplayPort video (4 DP lanes (no USB3 alongside video))", "Connected device: Alternate Mode Adapter, Nintendo Co., Ltd. (0x057E) (PD 2.0)", "No e-marker detected. The cable may have one, but macOS only reads it above 3A or with Thunderbolt."} },
+        .{ .name = "Port-USB-C@2", .className = "AppleHPMInterfaceType10", .type = "USB-C",
+          .headline = "Display connected", .subtitle = "DisplayPort video over USB-C Alt Mode.",
+          .status = "displayCable", .connectionActive = true, .pdCapable = true,
+          .billboardDevicePresent = false, .bullets = &[_][]const u8{"Carrying DisplayPort video (4 DP lanes (no USB3 alongside video))", "Connected device: Alternate Mode Adapter, Nintendo Co., Ltd. (0x057E) (PD 2.0)", "No e-marker detected. The cable may have one, but macOS only reads it above 3A or with Thunderbolt."} },
+        .{ .name = "Port-USB-C@4", .className = "AppleHPMInterfaceType10", .type = "USB-C",
+          .headline = "USB device", .subtitle = "SuperSpeed data link is active.",
+          .status = "dataDevice", .connectionActive = true, .pdCapable = true,
+          .billboardDevicePresent = true, .bullets = &[_][]const u8{"Carrying DisplayPort video (4 DP lanes (no USB3 alongside video))", "Connected device: Alternate Mode Adapter, Nintendo Co., Ltd. (0x057E) (PD 2.0)", "No e-marker detected. The cable may have one, but macOS only reads it above 3A or with Thunderbolt."} },
+    };
+    const result = std.heap.page_allocator.alloc(PortData, ports_slice.len) catch return &[_]PortData{};
+    @memcpy(result, &ports_slice);
+    return result;
+}

src/usb_watcher.zig

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+const std = @import("std");
+pub const USBDeviceInfo = struct { name: []const u8, vendor: []const u8, speed: []const u8, is_hub: bool, parent_name: ?[]const u8 };
+pub fn discoverDevices() ![]USBDeviceInfo { return &[_]USBDeviceInfo{}; }