Remove c.zig and dual namespacing

We don't really need @cImport. And dual namespacing (e.g., foundation.ns
or quartz_core.ca) just increases verbosity.

app_kit_manual.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const ca = @import("quartz_core.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");

avf_audio_manual.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 const objc = @import("objc.zig");

core_midi_manual.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 

generator.zig

@@ -1115,7 +1115,7 @@ fn Generator(comptime WriterType: type) type {
                 if (container.super) |super| {
                     try self.generateContainerName(super);
                 } else {
-                    try self.writer.writeAll("c.object_type");
+                    try self.writer.writeAll("objc.Id");
                 }
                 try self.writer.writeAll(", &.{");
             } else {

metal_manual.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 const objc = @import("objc.zig");

src/app_kit.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const ca = @import("quartz_core.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
@@ -159,7 +158,7 @@ pub const Notification = opaque {
 };
 
 pub const ObjectInterface = opaque {
-    pub const InternalInfo = objc.ExternClass("NSObject", @This(), c.object_type, &.{});
+    pub const InternalInfo = objc.ExternClass("NSObject", @This(), objc.Id, &.{});
     pub const as = InternalInfo.as;
     pub const retain = InternalInfo.retain;
     pub const release = InternalInfo.release;

src/avf_audio.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 const objc = @import("objc.zig");

src/core_midi.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 

src/main.zig

@@ -1,49 +1,30 @@
 const std = @import("std");
-const c = @import("c.zig");
-pub const objc = @import("objc.zig");
-
-pub const avf_audio = struct {
-    pub const avaudio = @import("avf_audio.zig");
-};
-
-pub const core_foundation = struct {
-    pub const cf = @import("core_foundation.zig");
-};
-
-pub const core_graphics = struct {
-    pub const cg = @import("core_graphics.zig");
-};
-
-pub const foundation = struct {
-    pub const ns = @import("foundation.zig");
-};
 
-pub const metal = struct {
-    pub const mtl = @import("metal.zig");
-};
-
-pub const quartz_core = struct {
-    pub const ca = @import("quartz_core.zig");
-};
-
-pub const app_kit = struct {
-    pub const ns = @import("app_kit.zig");
-};
-// TODO: delete `appkit` once Mach is using `app_kit`.
-pub const appkit = app_kit;
+pub const objc = @import("objc.zig");
+pub const avf_audio = @import("avf_audio.zig");
+pub const core_foundation = @import("core_foundation.zig");
+pub const core_graphics = @import("core_graphics.zig");
+pub const foundation = @import("foundation.zig");
+pub const metal = @import("metal.zig");
+pub const quartz_core = @import("quartz_core.zig");
+pub const app_kit = @import("app_kit.zig");
 
 pub const mach = struct {
     pub const AppDelegate = opaque {
-        pub fn allocInit() *AppDelegate {
-            return objc_alloc_init(c.objc_getClass("MACHAppDelegate").?);
-        }
-        extern "objc" fn objc_alloc_init(class: *anyopaque) *AppDelegate;
-
-        pub fn setRunBlock(self: *AppDelegate, block: *foundation.ns.Block(fn () void)) void {
+        pub const InternalInfo = objc.ExternClass("MACHAppDelegate", @This(), foundation.ObjectInterface, &.{app_kit.ApplicationDelegate});
+        pub const as = InternalInfo.as;
+        pub const retain = InternalInfo.retain;
+        pub const release = InternalInfo.release;
+        pub const autorelease = InternalInfo.autorelease;
+        pub const new = InternalInfo.new;
+        pub const alloc = InternalInfo.alloc;
+        pub const allocInit = InternalInfo.allocInit;
+
+        pub fn setRunBlock(self: *AppDelegate, block: *foundation.Block(fn () void)) void {
             method(self, block);
         }
         const method = @extern(
-            *const fn (*AppDelegate, *foundation.ns.Block(fn () void)) callconv(.C) void,
+            *const fn (*AppDelegate, *foundation.Block(fn () void)) callconv(.C) void,
             .{ .name = "\x01-[MACHAppDelegate setRunBlock:]" },
         );
     };

src/metal.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cf = @import("core_foundation.zig");
 const ns = @import("foundation.zig");
 const objc = @import("objc.zig");

src/objc.zig

@@ -30,6 +30,7 @@ pub const opt_new = objc_opt_new;
 pub const opt_class = objc_opt_class;
 pub const opt_isKindOfClass = objc_opt_isKindOfClass;
 
+// APIs that are part of libobjc's public API.
 pub const Class = opaque {};
 pub const Id = opaque {
     pub const InternalInfo = struct {

src/quartz_core.zig

@@ -1,4 +1,3 @@
-const c = @import("c.zig");
 const cg = @import("core_graphics.zig");
 const mtl = @import("metal.zig");
 const ns = @import("foundation.zig");