Implemented day 2.

src/input/mod.rs

@@ -1,7 +1,13 @@
-use std::{path::Path, io::{BufReader, BufRead, self}, fs::File};
+use std::{io::{BufReader, BufRead, self}, fs::File, str::FromStr, path::Path, convert::Infallible, num::ParseIntError};
 
 #[derive(Debug)]
-pub struct AdventError(String);
+pub struct AdventError(pub String);
+
+impl From<ParseIntError> for AdventError {
+    fn from(e: ParseIntError) -> Self {
+        AdventError(e.to_string())
+    }
+}
 
 impl From<io::Error> for AdventError {
     fn from(e: io::Error) -> Self {
@@ -9,8 +15,14 @@ impl From<io::Error> for AdventError {
     }
 }
 
-pub fn read_into_vec(path: &Path) -> Result<Vec<String>, AdventError> {
-    let file = File::open(path).expect("no such file");
+impl From<Infallible> for AdventError {
+    fn from(_: Infallible) -> Self {
+        unreachable!()
+    }
+}
+
+pub fn read_into_vec<T:FromStr>(file_path : &Path) -> Result<Vec<T>, AdventError> where AdventError: From<<T as FromStr>::Err> {
+    let file = File::open(file_path).expect("no such file");
     let buf = BufReader::new(file);
-    buf.lines().map(|line| line.map_err(Into::into)).collect::<Result<Vec<String>, AdventError>>()
+    buf.lines().map(|line| T::from_str(line?.as_str()).map_err(Into::into)).collect::<Result<Vec<T>, AdventError>>()
 }