002 if truthy

// Template engine: `{% if %}` control block in a |template| body.
// `flag` is a provided arg; non-empty captured text -> truthy -> guarded block
// emits. Anchors the cluster.
~import std/io

~pub tor maybe { flag: usize }

~[template]proc maybe|zig {
    @import("std").debug.print("always\n", .{});
    {% if flag %}
    @import("std").debug.print("flag-set\n", .{});
    {% endif %}
}

// JS sibling — the pin is the ENGINE (`{% if %}` over a provided arg's captured
// text), and the engine is target-blind: the same liquid render decides the same
// way for both variants. Only the guarded/unguarded statements are host text.
// `console.log` supplies the trailing newline.
~[template]proc maybe|js {
    console.log("always");
    {% if flag %}
    console.log("flag-set");
    {% endif %}
}

~maybe(flag: 1)