chore: add helper to split a string in two and parse each side

Author: clechasseur

aoclp/src/lib.rs

@@ -5,6 +5,7 @@ pub mod forth;
 pub mod looping;
 pub mod positioning;
 pub mod solvers_impl;
+pub mod str;
 
 pub type Error = anyhow::Error;
 pub type Result<T> = anyhow::Result<T>;

aoclp/src/str.rs

@@ -0,0 +1,26 @@
+use std::str::FromStr;
+
+pub trait StrHelper {
+    fn split_parse_at<T, U>(&self, pos: usize) -> (T, U)
+    where
+        T: FromStr,
+        U: FromStr,
+        <T as FromStr>::Err: std::fmt::Debug,
+        <U as FromStr>::Err: std::fmt::Debug;
+}
+
+impl<S> StrHelper for S
+where
+    S: AsRef<str>,
+{
+    fn split_parse_at<T, U>(&self, pos: usize) -> (T, U)
+    where
+        T: FromStr,
+        U: FromStr,
+        <T as FromStr>::Err: std::fmt::Debug,
+        <U as FromStr>::Err: std::fmt::Debug,
+    {
+        let s = self.as_ref();
+        (s[0..pos].parse().unwrap(), s[pos..].parse().unwrap())
+    }
+}

aoclp_solutions/src/y2025/day_01.rs

@@ -3,6 +3,7 @@ use std::str::FromStr;
 
 use aoclp::anyhow::anyhow;
 use aoclp::solvers_impl::input::safe_get_input_as_many;
+use aoclp::str::StrHelper;
 
 pub fn part_1() -> usize {
     moves().filter(|dial| *dial == 0).count()
@@ -81,8 +82,7 @@ impl FromStr for Rotation {
     type Err = aoclp::Error;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let direction: RotationDirection = s[0..1].parse()?;
-        let clicks: i64 = s[1..].parse()?;
+        let (direction, clicks) = s.split_parse_at(1);
         Ok(Self { direction, clicks })
     }
 }