feat: add DHAT profiler (#52)

src/template/commands/solve.rs

@@ -2,10 +2,17 @@ use std::process::{Command, Stdio};
 
 use crate::template::Day;
 
-pub fn handle(day: Day, release: bool, time: bool, submit_part: Option<u8>) {
+pub fn handle(day: Day, release: bool, time: bool, dhat: bool, submit_part: Option<u8>) {
     let mut cmd_args = vec!["run".to_string(), "--bin".to_string(), day.to_string()];
 
-    if release {
+    if dhat {
+        cmd_args.extend([
+            "--profile".to_string(),
+            "dhat".to_string(),
+            "--features".to_string(),
+            "dhat-heap".to_string(),
+        ]);
+    } else if release {
         cmd_args.push("--release".to_string());
     }
 

src/template/mod.rs

@@ -52,6 +52,10 @@ macro_rules! solution {
         /// The current day.
         const DAY: $crate::template::Day = $crate::day!($day);
 
+        #[cfg(feature = "dhat-heap")]
+        #[global_allocator]
+        static ALLOC: dhat::Alloc = dhat::Alloc;
+
         fn main() {
             use $crate::template::runner::*;
             let input = $crate::template::read_file("inputs", DAY);

src/template/runner.rs

@@ -31,7 +31,14 @@ fn run_timed<I: Clone, T>(
     hook: impl Fn(&T),
 ) -> (T, Duration, u128) {
     let timer = Instant::now();
-    let result = func(input.clone());
+    let result = {
+        let input = input.clone();
+
+        #[cfg(feature = "dhat-heap")]
+        let _profiler = dhat::Profiler::new_heap();
+
+        func(input)
+    };
     let base_time = timer.elapsed();
 
     hook(&result);