wire Services through to aws.zig and main demo

src/aws.zig

@@ -11,8 +11,16 @@ pub const Options = struct {
     dualstack: bool = false,
 };
 
+/// Using this constant may blow up build times. Recommed using Services()
+/// function directly, e.g. const services = Services(.{.sts, .ec2, .s3, .ddb}){};
 pub const services = servicemodel.services;
 
+/// Get a service model by importing specific services only. As an example:
+/// const services = Services(.{.sts, .ec2, .s3, .ddb}){};
+///
+/// This will give you a constant with service data for sts, ec2, s3 and ddb only
+pub const Services = servicemodel.Services;
+
 pub const Aws = struct {
     allocator: *std.mem.Allocator,
     aws_http: awshttp.AwsHttp,

src/main.zig

@@ -45,7 +45,8 @@ pub fn main() anyerror!void {
 
     var client = aws.Aws.init(allocator);
     defer client.deinit();
-    const resp = try client.call(aws.services.sts.get_caller_identity.Request{}, options);
+    const services = aws.Services(.{.sts}){};
+    const resp = try client.call(services.sts.get_caller_identity.Request{}, options);
     // TODO: This is a bit wonky. Root cause is lack of declarations in
     //       comptime-generated types
     defer resp.deinit();
@@ -56,7 +57,7 @@ pub fn main() anyerror!void {
 
         var client2 = aws.Aws.init(allocator);
         defer client2.deinit();
-        const resp2 = try client2.call(aws.services.sts.get_caller_identity.Request{}, options); // catch here and try alloc?
+        const resp2 = try client2.call(services.sts.get_caller_identity.Request{}, options); // catch here and try alloc?
         defer resp2.deinit();
     }