From 7a68255eaca3bf8d2ddf7f33ba86e4bd11966dc6 Mon Sep 17 00:00:00 2001
From: Fabian Schmidt <fabschmidt96@gmail.com>
Date: Mon, 24 Feb 2025 10:33:11 +0100
Subject: [PATCH] Add logging and panic hook

---
 Cargo.toml |  1 +
 src/lib.rs | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index e2021b7..a6bf808 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,6 +19,7 @@ wasm-bindgen = "0.2.100"
 # code size when deploying.
 console_error_panic_hook = { version = "0.1.7", optional = true }
 js-sys = "0.3.77"
+web-sys = { version = "0.3.77", features = ["console"] }
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.50"
diff --git a/src/lib.rs b/src/lib.rs
index 2c0c3b5..36fda2d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,12 @@ use std::fmt;
 
 use wasm_bindgen::prelude::*;
 
+macro_rules! log {
+    ( $( $t:tt )* ) => {
+        web_sys::console::log_1(&format!( $( $t )* ).into());
+    };
+}
+
 #[wasm_bindgen]
 extern "C" {
     fn alert(s: &str);
@@ -55,6 +61,8 @@ impl Universe {
 #[wasm_bindgen]
 impl Universe {
     pub fn tick(&mut self) {
+        utils::set_panic_hook();
+
         let mut next = self.cells.clone();
 
         for row in 0..self.height {
@@ -63,6 +71,14 @@ impl Universe {
                 let cell = self.cells[idx];
                 let live_neighbors = self.live_neighbor_count(row, col);
 
+                //log!(
+                //    "cell[{}, {}] is initially {:?} and has {} live neighbors",
+                //    row,
+                //    col,
+                //    cell,
+                //    live_neighbors
+                //);
+
                 let next_cell = match (cell, live_neighbors) {
                     // Rule 1: Any live cell with fewer than two live neighbours
                     // dies, as if caused by underpopulation.
@@ -80,6 +96,8 @@ impl Universe {
                     (otherwise, _) => otherwise,
                 };
 
+                //log!("    it becomes {:?}", next_cell);
+
                 next[idx] = next_cell;
             }
         }