some setup for subcommands: do nothing right now, experimenting with pointers

src/subcommands.zig

@@ -0,0 +1,32 @@
+const std = @import("std");
+
+pub const Handler = *const fn (*std.process.Args.Iterator) anyerror!void;
+
+pub const Subcommand = struct {
+    name: []const u8,
+    handler: Handler,
+};
+
+pub const subcommands = [_]Subcommand{
+    .{ .name = "add", .handler = handleAdd },
+    .{ .name = "remove", .handler = handleRemove },
+    .{ .name = "done", .handler = handleDone },
+    .{ .name = "list", .handler = handleList },
+};
+
+pub fn handleAdd(args: *std.process.Args.Iterator) !void {
+    _ = args;
+    std.debug.print("add!", .{});
+}
+
+pub fn handleRemove(args: *std.process.Args.Iterator) !void {
+    _ = args;
+}
+
+pub fn handleDone(args: *std.process.Args.Iterator) !void {
+    _ = args;
+}
+
+pub fn handleList(args: *std.process.Args.Iterator) !void {
+    _ = args;
+}