Macro petrichor::stdio_handler

macro_rules! stdio_handler {
    (let $name:ident = $path:literal -> wrap $cmd_path:expr, $args:expr ; ) => { ... };
    (
        let $name:ident = $path:literal ->
        read $attrib:literal from $cmd_path:expr, $args:expr ;
    ) => { ... };
    () => { ... };
}