usage

getopt_long

Function usage 

Source 
pub fn usage(name: &str, desc: &str, version: &str, opts: &[Opt])
Examples found in repository?
examples/ex1/main.rs (line 17)
7fn main() -> OptResult<()> {
8    let longopts = &[
9        Opt::new(None, Some('v'), HasArg::NoArgument, "show version.").unwrap(),
10        Opt::new(None, Some('h'), HasArg::NoArgument, "help information.").unwrap(),
11        Opt::new(None, Some('a'), HasArg::RequiredArgument, "add record to table.").unwrap(),
12        Opt::new(None, Some('r'), HasArg::OptionalArgument, "remove record from table.").unwrap(),
13        Opt::new(None, Some('m'), HasArg::NoArgument, "modify the record in table.").unwrap(),
14        Opt::new(None, Some('q'), HasArg::NoArgument, "query the table.").unwrap(),
15    ];
16
17    usage("ex1", "this is ex1 example.", env!("CARGO_PKG_VERSION"), longopts);
18    let p = getopt_long(longopts)?;
19    println!("{}", p);
20    Ok(())
21}
More examples
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examples/ex2/main.rs (line 17)
7fn main() -> OptResult<()> {
8    let longopts = &[
9        Opt::new(None, Some('v'), HasArg::NoArgument, "show version.").unwrap(),
10        Opt::new(None, Some('h'), HasArg::NoArgument, "help information.").unwrap(),
11        Opt::new(Some("add".to_owned()), Some('a'), HasArg::RequiredArgument, "add record to table.").unwrap(),
12        Opt::new(Some("remove".to_owned()), Some('r'), HasArg::OptionalArgument, "remove record from table.").unwrap(),
13        Opt::new(Some("modify".to_owned()), Some('m'), HasArg::NoArgument, "modify the record in table.").unwrap(),
14        Opt::new(Some("query".to_owned()), None, HasArg::NoArgument, "query the table.").unwrap(),
15    ];
16
17    usage("ex2", "this is ex2 example.", env!("CARGO_PKG_VERSION"), longopts);
18    match getopt_long(longopts) {
19        Ok(p) => println!("Arguments:\n{}", p),
20        Err(e) => println!("{}", e),
21    }
22    
23    Ok(())
24}