10 files changed, 232 insertions, 0 deletions
diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000..55b82b2
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,7 @@
+;;; Directory Local Variables            -*- no-byte-compile: t -*-
+;;; For more information see (info "(emacs) Directory Variables")
+
+((nil . ((compile-command . "make serve")))
+ (js-base-mode . ((js-indent-level . 4)
+                  (js-chain-indent . t)
+                  (js-indent-first-init . dynamic))))
diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..54954ce
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/pkg
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..217555e
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,133 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "addem"
+version = "0.1.0"
+dependencies = [
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
+
+[[package]]
+name = "log"
+version = "0.4.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
+
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1885c039570dc00dcb4ff087a89e185fd56bae234ddc7f056a945bf36467248d"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rustversion"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
+
+[[package]]
+name = "syn"
+version = "2.0.104"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17b6f705963418cdb9927482fa304bc562ece2fdd4f616084c50b7023b435a40"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1edc8929d7499fc4e8f0be2262a241556cfc54a0bea223790e71446f2aab1ef5"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f0a0651a5c2bc21487bde11ee802ccaf4c51935d0d3d42a6101f98161700bc6"
+dependencies = [
+ "bumpalo",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fe63fc6d09ed3792bd0897b314f53de8e16568c2b3f7982f468c0bf9bd0b407"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a05d73b933a847d6cccdda8f838a22ff101ad9bf93e33684f39c1f5f0eece3d"
+dependencies = [
+ "unicode-ident",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..64c79ab
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "addem"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wasm-bindgen = "0.2"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f37f0ac
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+# the --target is currently necessary or firefox will return
+# "disallowed mime type" -bjc 7-aug-2025
+build:
+	wasm-pack build --target web
+
+serve: build
+	python -m http.server 8118
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..1aad79c
--- /dev/null
+++ b/index.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>wasm test</title>
+  </head>
+
+  <body>
+    <h1>wasm test</h1>
+    <input type='number' id='number-input1' placeholder='5'>
+    <input type='number' id='number-input2' placeholder='3'>
+    <button onclick='calculate()'>calc</button>
+    <p>
+      result: <span id='result'></span>
+    </p>
+
+    <script src='./main.mjs' type='module'></script>
+  </body>
+</html>
diff --git a/main.mjs b/main.mjs
new file mode 100644
index 0000000..086b876
--- /dev/null
+++ b/main.mjs
@@ -0,0 +1,16 @@
+import init from './pkg/addem.js';
+
+async function run() {
+    console.debug('run');
+    const foo = await init();
+    console.debug('init done', foo);
+    window.calculate = _ => {
+        console.debug('calc');
+        const inp1 = document.getElementById('number-input1').value;
+        const inp2 = document.getElementById('number-input2').value;
+        const res = foo.add(parseInt(inp1), parseInt(inp2));
+        document.getElementById('result').textContent = res;
+    }
+}
+
+document.addEventListener('DOMContentLoaded', run);
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..ab0fd32
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,21 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShellNoCC {
+  packages = with pkgs; [
+    rustc
+    clang # yes, it's necessary or ‘cc’ can't be found. -bjc 2025-aug-7
+    lld # ibid.
+    cargo
+    rust-analyzer
+    wasm-pack
+    # the only thing better than needing cargo's infinite dependencies
+    # is needing npm's as well, just so we can use a bundler built for
+    # another, wildly different, registry.
+    nodePackages.npm
+
+    # for http.server
+    python3
+  ];
+
+  CARGO_HOME = "/data/bjc/cargo";
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7db4248
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,17 @@
+use wasm_bindgen::prelude::wasm_bindgen;
+
+#[wasm_bindgen]
+pub fn add(left: u32, right: u32) -> u32 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}