From 4ea872c60f678c034039ca4da1c2f4f154050b6b Mon Sep 17 00:00:00 2001
From: Greg Shuflin <greg@everydayimshuflin.com>
Date: Tue, 2 Jan 2024 02:18:47 -0800
Subject: [PATCH] Game of life boilerplate

---
 Cargo.lock               | 18 ++++++++++++++++++
 game-of-life/Cargo.toml  | 12 ++++++++++++
 game-of-life/justfile    |  8 ++++++++
 game-of-life/src/lib.rs  | 21 ++++++++++-----------
 game-of-life/src/util.rs | 10 ++++++++++
 5 files changed, 58 insertions(+), 11 deletions(-)
 create mode 100644 game-of-life/justfile
 create mode 100644 game-of-life/src/util.rs

diff --git a/Cargo.lock b/Cargo.lock
index 3ce8a32..c2a369a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,6 +14,16 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "console_error_panic_hook"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06aeb73f470f66dcdbf7223caeebb85984942f22f1adb2a088cf9668146bbbc"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "gamarjoba"
 version = "0.1.0"
@@ -21,6 +31,14 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "game-of-life"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "log"
 version = "0.4.20"
diff --git a/game-of-life/Cargo.toml b/game-of-life/Cargo.toml
index e7a5a94..bb8a36b 100644
--- a/game-of-life/Cargo.toml
+++ b/game-of-life/Cargo.toml
@@ -5,4 +5,16 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
 [dependencies]
+wasm-bindgen = "0.2.84"
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/game-of-life/justfile b/game-of-life/justfile
new file mode 100644
index 0000000..3d1b34c
--- /dev/null
+++ b/game-of-life/justfile
@@ -0,0 +1,8 @@
+_default:
+    just --list
+
+wasm_pack :=  "~/.cargo/bin/wasm-pack"
+
+# Use wasm-pack to build
+build:
+    {{wasm_pack}} build
diff --git a/game-of-life/src/lib.rs b/game-of-life/src/lib.rs
index 7d12d9a..aacbc2d 100644
--- a/game-of-life/src/lib.rs
+++ b/game-of-life/src/lib.rs
@@ -1,14 +1,13 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
+mod util;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+extern "C" {
+    fn alert(s: &str);
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
+#[wasm_bindgen]
+pub fn greet() {
+    alert("Hello, {{project-name}}!");
 }
diff --git a/game-of-life/src/util.rs b/game-of-life/src/util.rs
new file mode 100644
index 0000000..b1d7929
--- /dev/null
+++ b/game-of-life/src/util.rs
@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}