Function load_plugin_config_files

crates/core/src/plugin.rs:1112–1134

(paths: I)

/// when none exist. Internal: `pub` only for cross-crate reuse by the gateway.
#[doc(hidden)]
pub fn load_plugin_config_files<I>(paths: I) -> Result<Option<(Json, Vec<PathBuf>)>>
where
    I: IntoIterator<Item = PathBuf>,
{
    let mut merged = Json::Object(Map::new());
    let mut sources = Vec::new();
    for path in paths {
        if !path.exists() {
            continue;
        }
        let raw = std::fs::read_to_string(&path).map_err(|err| {
            PluginError::InvalidConfig(format!("failed to read {}: {err}", path.display()))
        })?;
        let parsed = raw.parse::<toml::Table>().map_err(|err| {
            PluginError::InvalidConfig(format!("invalid plugin TOML in {}: {err}", path.display()))
        })?;
        let document = serde_json::to_value(parsed)?;
        validate_unique_component_kinds(&path, &document)?;
        layer_config(&mut merged, document);
        sources.push(path);
    }
    Ok((!sources.is_empty()).then_some((merged, sources)))
}

/// Rejects a single file that declares the same component `kind` more than once.
fn validate_unique_component_kinds(path: &Path, document: &Json) -> Result<()> {