# Module :: wca [](https://github.com/emersion/stability-badges#experimental) [](https://github.com/Wandalen/wTools/actions/workflows/module_wca_push.yml) [](https://docs.rs/wca) [](https://gitpod.io/#RUN_PATH=.,SAMPLE_FILE=module%2Fmove%2Fwca%2Fexamples%2Fwca_trivial.rs,RUN_POSTFIX=--example%20wca_trivial/https://github.com/Wandalen/wTools) [](https://discord.gg/m3YfbXpUUY) The tool to make CLI ( commands user interface ). It is able to aggregate external binary applications, as well as functions, which are written in your language. ## Sample ```rust #[ cfg( not( feature = "no_std" ) ) ] { use wca::{ VerifiedCommand, Context, Type }; fn main() { let ca = wca::CommandsAggregator::former() .command( "echo" ) .hint( "prints all subjects and properties" ) .subject().hint( "Subject" ).kind( Type::String ).optional( true ).end() .property( "property" ).hint( "simple property" ).kind( Type::String ).optional( true ).end() .routine( | o : VerifiedCommand | { println!( "= Args\n{:?}\n\n= Properties\n{:?}\n", o.args, o.props ) } ) .end() .command( "error" ) .hint( "prints all subjects and properties" ) .subject().hint( "Error message" ).kind( Type::String ).optional( true ).end() .routine( | o : VerifiedCommand | { println!( "Returns an error" ); Err( format!( "{}", o.args.get_owned::< String >( 0 ).unwrap_or_default() ) ) } ) .end() .command( "exit" ) .hint( "just exit" ) .routine( || { println!( "exit" ); std::process::exit( 0 ) } ) .end() .perform(); let args = std::env::args().skip( 1 ).collect::< Vec< String > >(); ca.perform( args ).unwrap(); } } ``` ### To add to your project ```sh cargo add wca ``` ### Try out from the repository ```sh git clone https://github.com/Wandalen/wTools cd wTools cd examples/wca_trivial cargo run ```