feat: Add initial draft for rust wasm

It adds the initial tooling for build and publishing a static site with
wasm.

The generate code is barebones, that is just a PoC for tooling, later
I'll add proper code logic and test for it.

2 files changed, 31 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..662dda6
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,21 @@
+mod utils;
+
+use wasm_bindgen::prelude::*;
+use rand::Rng;
+
+// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
+// allocator.
+#[cfg(feature = "wee_alloc")]
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn generate() -> String {
+    let num = rand::thread_rng().gen_range(0..100);
+    format!("{}", num)
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..b1d7929
--- /dev/null
+++ b/src/utils.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();
+}