023 comptime program return

// TEST: Comptime events can return modified Program
//
// A [comptime] event that declares `program: *const Program` in its OUTPUT
// should have that Program used as the new AST going forward.
//
// This enables holistic AST transformations without needing [transform].
// Transforms are for surgical replacement of specific invocations.
// Comptime + Program return is for cross-cutting AST modifications.

const std = @import("std");
const ast = @import("ast");
const ast_functional = @import("ast_functional");

// Comptime event that RETURNS a modified Program
~[comptime] event augment-program {
    program: *const ast.Program,
    allocator: std.mem.Allocator
}
| done *const ast.Program

~[comptime] proc augment-program|zig {
    // Use ast_functional to add a new item to the program
    // For now, just return the program unchanged
    std.debug.print("augment_program: received {} items\n", .{program.items.len});

    // TODO: Actually modify the program using ast_functional
    // const new_program = ast_functional.addItem(allocator, program, new_item);
    // return .{ .done = new_program };

    return .{ .done = program };
}

// Invoke the augmentation — no continuations needed
~augment-program()

// A simple runtime event to verify compilation works
~event hello {}

~proc hello|zig {
    std.debug.print("Hello from augmented program!\n", .{});
}

~hello()