split and snap

src/report.rs

@@ -0,0 +1,46 @@
+use std::collections::HashSet;
+
+use crate::crossings::Crossing;
+
+pub fn print_report(crossings: &[Crossing]) {
+    eprintln!();
+    eprintln!("County visits");
+    eprintln!("=============");
+
+    if crossings.is_empty() {
+        eprintln!("No county crossings found.");
+        return;
+    }
+
+    let mut visits = Vec::new();
+
+    visits.push(crossings[0].from.clone());
+
+    for crossing in crossings {
+        visits.push(crossing.to.clone());
+    }
+
+    for (index, county) in visits.iter().enumerate() {
+        eprintln!("{:3}  {} [{}]", index + 1, county.name, county.id,);
+    }
+
+    let unique: HashSet<String> = visits.iter().map(|county| county.id.clone()).collect();
+
+    eprintln!();
+    eprintln!("Visits:          {}", visits.len());
+
+    eprintln!("Unique counties: {}", unique.len());
+
+    eprintln!();
+    eprintln!("Border crossings");
+    eprintln!("=================");
+
+    for (index, crossing) in crossings.iter().enumerate() {
+        eprintln!(
+            "{:3}  {} -> {}",
+            index + 1,
+            crossing.from.name,
+            crossing.to.name,
+        );
+    }
+}