039 file source syntax

// Test 210_039: File Source Syntax
// Validates the [type]"path" syntax for reading files as Source at compile time
//
// Syntax: ~event [type]"path"
// vs:     ~event [type]{ inline content }

const std = @import("std");

// Event that takes Source parameter
~[comptime|transform]event render.file {
    source: Source[text],
    program: *const Program,
    allocator: std.mem.Allocator
}
| transformed { program: *const Program }

~proc render.file {
    // Just print what we received to prove file was read
    std.debug.print("File content: '{s}'\n", .{source.text});
    std.debug.print("Phantom type: '{s}'\n", .{source.phantom_type orelse "none"});

    // Return program unchanged
    return .{ .transformed = .{ .program = program } };
}

// Test: Read file content using [type]"path" syntax
~render.file [text]"hello.txt"
| transformed _ |> _