Add helper lib

1 files changed, 19 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f0199c7
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,19 @@
+use std::str::FromStr;
+use std::fmt::Debug;
+
+pub fn read_file(day: u8) -> String {
+    let filename = format!("inputs/day{}", day);
+    std::fs::read_to_string(filename).unwrap()
+}
+
+pub fn read_lines(day: u8) -> Vec<String> {
+    read_file(day).split_terminator('\n')
+                  .map(String::from)
+                  .collect()
+}
+
+pub fn read_numbers<T: FromStr>(day: u8) -> Vec<T> where <T as FromStr>::Err: Debug {
+    read_lines(day).iter()
+                   .map(|n| n.parse::<T>().unwrap())
+                   .collect::<Vec<T>>()
+}