feat: add total timing

README.md

@@ -81,10 +81,25 @@ cargo run --bin <day>
 
 To run an optimized version for benchmarking, use the `--release` flag or the alias `cargo rr --bin <day>`.
 
-### Run all solutions
+### Run solutions for all days
 
 ```sh
 cargo run
+
+# output:
+#     Running `target/release/aoc`
+# ----------
+# | Day 01 |
+# ----------
+# 🎄 Part 1 🎄
+#
+# 0 (elapsed: 170.00µs)
+#
+# 🎄 Part 2 🎄
+#
+# 0 (elapsed: 30.00µs)
+# <...other days...>
+# Total: 0.20ms
 ```
 
 To run an optimized version for benchmarking, use the `--release` flag or the alias `cargo rr`.

scripts/scaffold.sh

@@ -19,8 +19,6 @@ module_path="src/bin/$filename.rs";
 touch $module_path;
 
 cat > $module_path <<EOF
-use aoc::{solve_day, read_file};
-
 pub fn part_one(input: &str) -> u32 {
     0
 }
@@ -30,7 +28,7 @@ pub fn part_two(input: &str) -> u32 {
 }
 
 fn main() {
-    solve_day!(&read_file("inputs", DAYNUM), part_one, part_two)
+    aoc::solve!(&aoc::read_file("inputs", DAYNUM), part_one, part_two)
 }
 
 #[cfg(test)]

src/lib.rs

@@ -1,12 +1,12 @@
 use std::env;
 use std::fs;
 
-pub static ANSI_ITALIC: &str = "\x1b[3m";
-pub static ANSI_BOLD: &str = "\x1b[1m";
-pub static ANSI_RESET: &str = "\x1b[0m";
+pub const ANSI_ITALIC: &str = "\x1b[3m";
+pub const ANSI_BOLD: &str = "\x1b[1m";
+pub const ANSI_RESET: &str = "\x1b[0m";
 
 #[macro_export]
-macro_rules! solve_day {
+macro_rules! solve {
     ($input:expr, $part_one:ident, $part_two:ident) => {{
         use aoc::{ANSI_BOLD, ANSI_ITALIC, ANSI_RESET};
         use std::fmt::Display;
@@ -40,3 +40,78 @@ pub fn read_file(folder: &str, day: u8) -> String {
     let f = fs::read_to_string(filepath);
     f.expect("could not open input file")
 }
+
+fn parse_time(val: &str, postfix: &str) -> f64 {
+    val.split(postfix).next().unwrap().parse().unwrap()
+}
+
+pub fn parse_exec_time(output: &str) -> f64 {
+    output.lines().fold(0_f64, |acc, l| {
+        if !l.contains("elapsed:") {
+            acc
+        } else {
+            let timing = l
+                .split("(elapsed: ")
+                .last()
+                .unwrap();
+
+            // see [rust/library/core/src/time.rs](https://git.io/Jy1rI)
+            if timing.ends_with("ns)") {
+                acc // range below rounding precision.
+            } else if timing.ends_with("µs)") {
+                acc + parse_time(timing, "µs") / 1000_f64
+            } else if timing.ends_with("ms)") {
+                acc + parse_time(timing, "ms")
+            } else if timing.ends_with("s)") {
+                acc + parse_time(timing, "s") * 1000_f64
+            } else {
+                acc
+            }
+        }
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// copied from: [rust/library/std/src/macros.rs](https://git.io/Jy1r7)
+    macro_rules! assert_approx_eq {
+        ($a:expr, $b:expr) => {{
+            let (a, b) = (&$a, &$b);
+            assert!(
+                (*a - *b).abs() < 1.0e-6,
+                "{} is not approximately equal to {}",
+                *a,
+                *b
+            );
+        }};
+    }
+
+    #[test]
+    fn test_parse_exec_time() {
+        assert_approx_eq!(
+            parse_exec_time(
+                "🎄 Part 1 🎄\n0 (elapsed: 74.13ns)\n🎄 Part 2 🎄\n0 (elapsed: 50.00ns)"
+            ),
+            0_f64
+        );
+
+        assert_approx_eq!(
+            parse_exec_time("🎄 Part 1 🎄\n0 (elapsed: 755µs)\n🎄 Part 2 🎄\n0 (elapsed: 700µs)"),
+            1.455_f64
+        );
+
+        assert_approx_eq!(
+            parse_exec_time("🎄 Part 1 🎄\n0 (elapsed: 70µs)\n🎄 Part 2 🎄\n0 (elapsed: 1.45ms)"),
+            1.52_f64
+        );
+
+        assert_approx_eq!(
+            parse_exec_time(
+                "🎄 Part 1 🎄\n0 (elapsed: 10.3s)\n🎄 Part 2 🎄\n0 (elapsed: 100.50ms)"
+            ),
+            10400.50_f64
+        );
+    }
+}

src/main.rs

@@ -1,8 +1,9 @@
-use aoc::{ANSI_BOLD, ANSI_RESET};
+use aoc::{ANSI_BOLD, ANSI_ITALIC, ANSI_RESET};
 use std::process::Command;
 
 fn main() {
-    (1..=25).for_each(|day| {
+    let total: f64 = (1..=25)
+        .map(|day| {
             let day = format!("{:02}", day);
 
             let cmd = Command::new("cargo")
@@ -10,17 +11,25 @@ fn main() {
                 .output()
                 .unwrap();
 
-        let output = String::from_utf8(cmd.stdout).unwrap();
             println!("----------");
             println!("{}| Day {} |{}", ANSI_BOLD, day, ANSI_RESET);
             println!("----------");
-        println!(
-            "{}",
-            if !output.is_empty() {
-                output
+
+            let output = String::from_utf8(cmd.stdout).unwrap();
+            let is_empty = output.is_empty();
+
+            println!("{}", if is_empty { "Not solved." } else { &output });
+
+            if is_empty {
+                0_f64
             } else {
-                "Not solved.".to_string()
+                aoc::parse_exec_time(&output)
             }
+        })
+        .sum();
+
+    println!(
+        "{}Total:{} {}{:.2}ms{}",
+        ANSI_BOLD, ANSI_RESET, ANSI_ITALIC, total, ANSI_RESET
     );
-    });
 }