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//! Regression for the bug this trait-based wiring fixes: a `#[settings(flatten)]` child whose
//! type lives in a *different* module and is imported by name alone. Before `SettingsNested`
//! became a trait, the parent macro fabricated a bare `__SettingsNestedArbStrategyConfig` ident
//! that only resolved if the companion struct happened to be in scope — so importing only the
//! type (`use inner::Sub;`) failed with `cannot find type __SettingsNested...`. This file
//! exercises exactly that shape; if it compiles, name resolution now follows the type.
use clap::Parser;
use v_utils_macros::Settings;
mod inner {
use serde::{Deserialize, Serialize};
use v_utils_macros::SettingsNested;
#[derive(Clone, Debug, Default, Deserialize, Serialize, SettingsNested)]
pub struct Sub {
#[serde(default)]
pub threshold: u32,
#[serde(default)]
pub label: String,
}
}
// By name only — the companion `__SettingsNestedSub` is deliberately NOT imported.
use inner::Sub;
#[derive(Debug, Parser)]
#[allow(unused)]
struct Cli {
#[clap(flatten)]
settings_flags: SettingsFlags,
}
#[derive(Clone, Debug, Default, v_utils_macros::MyConfigPrimitives, Settings)]
#[allow(unused)]
struct AppConfig {
#[serde(default)]
host: String,
#[settings(flatten)]
#[serde(default)]
sub: Sub,
}
#[test]
fn flatten_child_in_other_module_resolves_by_name() {
use v_utils::__internal::config::Source as _;
// Build the flags the way they're actually built: clap parsing the flattened child's
// `--sub-*` args (its fields are a private impl detail, never named by hand). The flattened
// child type `Sub` was imported by name only — the old `__SettingsNested*` name fabrication
// would have failed to compile this whole struct.
let cli = Cli::parse_from(["app", "--host", "localhost", "--sub-threshold", "7", "--sub-label", "hi"]);
// `collect` walks the flattened child via `<Sub as SettingsNested>::collect_config`, proving
// the trait method replaced the old inherent one and that paths resolve cross-module.
let map = cli.settings_flags.collect().expect("flag source collects");
assert_eq!(map.get("sub.threshold").map(ToString::to_string), Some("7".to_string()));
assert_eq!(map.get("sub.label").map(ToString::to_string), Some("hi".to_string()));
}