refined regex workup

move from for loop to chained iterators
format output to match tests

src/main.rs

@@ -16,7 +16,7 @@ fn main() {
 
     println!();
 
-    let test = "01|15|59, 1|47|16.35, 1|20|30, 1|43|03";
+    let test = args[0];
 
     let hms = Regex::new(r"(\d\d?)\|(\d\d)\|(\d\d)").unwrap();
     let csv = Regex::new(r", ").unwrap();
@@ -25,40 +25,34 @@ fn main() {
         m.unwrap().as_str().parse::<usize>().unwrap()
     };
 
-    let mut vec = vec![];
-
-    for cap in hms.captures_iter(test) {
-
-        let mut col = cap.iter().skip(1)
-            .map(|e| parse_int(e)).collect::<Vec<usize>>();
-
-        vec.push(col[0] * 3600 + col[1] * 60 + col[2]);
-    }
-
-    let median = |v: Vec<usize>| {
-        if v.len() % 2 == 1 {
-            v[v.len()/2 + 1]
-        } else {
-            (v[v.len()/2] + v[v.len()/2 + 1])/2
-        }
+    let mut vec =
+        hms.captures_iter(test)
+        .map(|cap|
+            cap.iter().skip(1)
+            .map(parse_int)
+            .collect::<Vec<usize>>()
+            .chunks(3)
+                .map(|c| (c[0],c[1],c[2]))
+                .map(|(h,m,s)| h*3600 + m*60 +s)
+                .sum())
+        .collect::<Vec<usize>>();
+
+    vec.sort_unstable();
+
+    let (len, tot) = (vec.len(), vec.iter().sum::<usize>());
+    let (avg, mid, rng) = (tot/len, len/2, vec[len-1] - vec[0]);
+    let med = if len % 2 == 1 { vec[mid] }
+        else { (vec[mid-1] + vec[mid]) / 2 };
+
+    let time = |s| {
+        format!("{:02}|{:02}|{:02}", s/3600, s%3600/60, s%60)
     };
 
-    vec.sort();
-    let len = vec.len();
-    let tot = vec.iter().sum();
-
-    let mut list = vec![
-        ( "Total", tot ),
-        ( "Range", vec[len-1] - vec[0] ),
-        ( "Mean", tot/len ),
-        ( "Median", median(vec) )
-    ];
+    println!("\n{}", test);
+    println!("Range: {} Average: {} Median: {}",
+        time(rng), time(avg), time(med)
+    );
 
-    for i in list {
-        print!(" {}: {:02}|{:02}|{:02}",
-            i.0, i.1/3600, i.1%3600/60, i.1%60
-        );
-    }
     println!("\n");
 
 }