050 build flag check

// Test: CompilerEnv.hasFlag() with InvocationMeta for build configuration
// When --build=release is passed, only [release] annotated configs should activate

~import "$std/io"

const std = @import("std");
const Root = @import("root");

// A comptime event that checks build configuration (no Source, just meta)
~[comptime]pub event check_build { meta: InvocationMeta }
| activated { name: []const u8 }
| skipped { reason: []const u8 }

~proc check_build {
    // If no annotations, skip
    if (meta.annotations.len == 0) {
        return .{ .skipped = .{ .reason = "no annotation" } };
    }

    // Check known build configs with comptime strings
    for (meta.annotations) |ann| {
        if (std.mem.eql(u8, ann, "release")) {
            if (Root.CompilerEnv.hasFlag("build=release")) {
                return .{ .activated = .{ .name = "release" } };
            }
        }
        if (std.mem.eql(u8, ann, "debug")) {
            if (Root.CompilerEnv.hasFlag("build=debug")) {
                return .{ .activated = .{ .name = "debug" } };
            }
        }
    }

    // No matching build flag - skip this config
    return .{ .skipped = .{ .reason = "no matching flag" } };
}

// Test with [release] annotation - should activate when --build=release
~[release]check_build()
| activated _ |> std.io:println(text: "release: ACTIVATED")
| skipped _ |> std.io:println(text: "release: skipped")

// Test with [debug] annotation - should activate when --build=debug
~[debug]check_build()
| activated _ |> std.io:println(text: "debug: ACTIVATED")
| skipped _ |> std.io:println(text: "debug: skipped")