aoc: refactor main() function

aoc2015/src/main.rs

@@ -1,5 +1,3 @@
-use std::env;
-
 use aoc::Result;
 
 use aoc2015::day01;
@@ -7,23 +5,5 @@ use aoc2015::day01;
 fn main() -> Result<()> {
     let days: &[fn() -> Result<()>] = &[day01::run];
 
-    let mut args = env::args();
-    args.next();
-
-    match args.next() {
-        Some(arg) => {
-            let day: usize = arg.parse().expect("Please provide a day number");
-            days[day - 1]().unwrap_or_else(|e| eprintln!("error running day specified: {}", e));
-        }
-        None => {
-            for (i, day) in days.iter().enumerate() {
-                let i = i + 1;
-                println!("day{}: ", i);
-                day().unwrap_or_else(|e| eprintln!("error running day {}: {}", i, e));
-                println!();
-            }
-        }
-    }
-
-    Ok(())
+    aoc::run(days)
 }