40 lines
1.0 KiB
Rust
40 lines
1.0 KiB
Rust
use arkham::{App, Command, Context, Opt};
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fn main() {
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let _ = App::new()
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.name("Fibonacci App")
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.version("1.0")
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.long_desc("This app can be used to calculate fibonacci numbers")
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.command(
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Command::new("fib")
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.opt(
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Opt::scalar("count")
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.short("n")
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.long("num")
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.desc("The index of the fibonacci number to return"),
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)
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.short_desc("Calculates a fibonacci number")
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.handler(fibonacci_handler),
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)
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.run()
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.unwrap();
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}
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fn fibonacci_handler(_app: &App, ctx: &Context, _args: &[String]) {
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let v = fibonacci(
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ctx.get_string("count")
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.unwrap_or_else(|| "1".to_string())
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.parse()
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.unwrap_or(1),
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);
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println!("Value is: {}", v);
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}
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fn fibonacci(n: u32) -> u32 {
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match n {
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0 => 1,
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1 => 1,
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_ => fibonacci(n - 1) + fibonacci(n - 2),
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}
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}
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