rust/echor/src/main.rs


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use clap::{App, Arg};

/*
 * Lack of specified return value means the function will return an UNIT type
 */
fn main() {
    let matches = App::new("echor")
        .version("0.1.0")
        .author("Ronaldo curintiano")
        .about("echo rusty")
        .arg(
            Arg::with_name("text")
                .value_name("TEXT")
                .help("Input text")
                .required(true)
                .min_values(1),
        )
        .arg(
            Arg::with_name("omit_newline")
                .value_name("OMIT NEWLINE")
                .short("n")
                .help("Do not print newline")
                .takes_value(false),
        )
        .get_matches();

    let text = matches.values_of_lossy("text").unwrap().join(" ");
    let omit_newline :bool = matches.is_present("omit_newline");
    
    print!("{}{}",
        text,
        if omit_newline {""} else {"\n"});

}