35 lines
955 B
Rust
35 lines
955 B
Rust
use std::env;
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pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
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#[macro_export]
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macro_rules! err {
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($($string:expr),+) => (Box::<dyn std::error::Error>::from(format!($($string),+)))
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}
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pub type DayFunc = fn() -> Result<String>;
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pub fn run(days: &[DayFunc]) -> Result<()> {
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let mut args = env::args();
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args.next();
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match args.next() {
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Some(arg) => {
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let day: usize = arg.parse().expect("Please provide a day number");
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let res =
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days[day - 1]().or_else(|e| Err(err!("error running day specified: {}", e)))?;
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println!("{}", res);
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}
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None => {
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for (i, day) in days.iter().enumerate() {
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let i = i + 1;
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println!("day{}: ", i);
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let res = day().or_else(|e| Err(err!("error running day {}: {}", i, e)))?;
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println!("{}", res);
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}
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}
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}
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Ok(())
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}
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