049 invocation meta

// Test: InvocationMeta provides call site metadata for comptime introspection
// This enables conditional compilation based on flow annotations

~import std/io

const std = @import("std");

// A comptime event that receives metadata about its invocation
~[comptime]pub tor check-config { meta: InvocationMeta }
| matched string

~proc check-config|zig {
    // meta.annotations contains the flow annotations like ["release"], ["debug"]
    // meta.path contains the full path like "check_config"
    // meta.location contains the source location

    if (meta.annotations.len > 0) {
        // Return the first annotation as the config name
        return .{ .matched = meta.annotations[0] };
    } else {
    }
}

// Test 1: Invocation with [release] annotation
~[release]check-config()
| matched _ |> std/io:print.ln("Config: release")
| no-annotation |> std/io:print.ln("No config")

// Test 2: Invocation with [debug] annotation
~[debug]check-config()
| matched _ |> std/io:print.ln("Config: debug")
| no-annotation |> std/io:print.ln("No config")

// Test 3: Invocation without annotation
~check-config()
| matched _ |> std/io:print.ln("Config: unexpected")
| no-annotation |> std/io:print.ln("No config (expected)")