Macro cmd_lib_macros::use_custom_cmd

use_custom_cmd!() { /* proc-macro */ }

import user registered custom command

#[export_cmd(my_cmd)]
fn foo(args: CmdArgs, _envs: CmdEnvs) -> FunResult {
    println!("msg from foo(), args: {:?}", args);
    Ok("bar".into())
}

use_custom_cmd!(my_cmd);
run_cmd!(my_cmd)?;

Here we import the previous defined my_cmd command, so we can run it like a normal command.