Factor out from_file_data; hopefully this doesn't end up being the only shared thing.

src/bin/day2.rs

@@ -1,3 +1,4 @@
+use advent2021::from_file_data;
 use std::num;
 use std::str::FromStr;
 use thiserror::Error;
@@ -37,16 +38,6 @@ impl FromStr for Command {
     }
 }
 
-fn from_file_data<T: FromStr>(filedata: &str) -> Result<Vec<T>, T::Err> {
-    let mut retval = Vec::new();
-
-    for line in filedata.lines() {
-        retval.push(T::from_str(line)?);
-    }
-
-    Ok(retval)
-}
-
 #[test]
 fn command_parsing() {
     assert_eq!(Ok(Command::Forward(5)), Command::from_str("forward 5"));

src/lib.rs

@@ -0,0 +1,11 @@
+use std::str::FromStr;
+
+pub fn from_file_data<T: FromStr>(filedata: &str) -> Result<Vec<T>, T::Err> {
+    let mut retval = Vec::new();
+
+    for line in filedata.lines() {
+        retval.push(T::from_str(line)?);
+    }
+
+    Ok(retval)
+}