Added a package script to wrap generated wasm in js code.

Author: apnorton

.gitignore

@@ -1,2 +1,5 @@
 target
-pkg
+pkg
+.venv
+
+bot_code.js

bot_template.js.j2

@@ -0,0 +1,25 @@
+var wasm_data = "{{wasm_encoded}}";
+
+{{generated_js}}
+
+function asciiToBinary(str) {
+    if (typeof atob === "function") {
+        // this works in the browser
+        return atob(str);
+    } else {
+        // this works in node
+        return new Buffer(str, "base64").toString("binary");
+    }
+}
+
+function decode(encoded) {
+    var binaryString = asciiToBinary(encoded);
+    var bytes = new Uint8Array(binaryString.length);
+    for (var i = 0; i < binaryString.length; i++) {
+        bytes[i] = binaryString.charCodeAt(i);
+    }
+    return bytes.buffer;
+}
+
+let wasm_module;
+__wbg_init(decode(wasm_data)).then(result => wasm_module = result);

build_and_package.py

@@ -0,0 +1,55 @@
+import base64
+import os
+import sys
+import shutil
+import subprocess
+from pathlib import Path
+
+from jinja2 import Template
+
+if len(sys.argv) < 2:
+    print("USAGE: python build_and_package.py [project_folder]")
+    sys.exit(1)
+
+project = Path(sys.argv[1])
+os.chdir(project)
+
+target_folder = Path("./pkg/")
+
+# first do a little cleanup
+shutil.rmtree(target_folder)
+
+# Build the js (has exports, tho, so we'll do some sketchy substitution)
+subprocess.run(["wasm-pack", "build", "--release", "--target", "web"])
+
+potential_wasm_files = list(target_folder.glob("*_bg.wasm"))
+assert len(potential_wasm_files) == 1
+
+wasm_file = potential_wasm_files[0]
+with open(wasm_file, "rb") as f:
+    wasm_data = f.read()
+
+wasm_encoded = base64.b64encode(wasm_data).decode("utf-8")
+
+potential_js_files = list(target_folder.glob("*.js"))
+assert len(potential_js_files) == 1
+
+js_file = potential_js_files[0]
+with open(js_file) as f:
+    js_lines = f.read().splitlines()
+
+for i in range(len(js_lines)):
+    line = js_lines[i]
+    if line.strip().startswith("export function"):
+        js_lines[i] = line.replace("export ", "")
+    elif line.strip().startswith("export"):
+        js_lines[i] = "//delete this"
+js_lines = filter(lambda s: s != "//delete this", js_lines)
+
+os.chdir("..")
+with open("bot_template.js.j2") as f:
+    template = Template(f.read())
+
+rendered = template.render(wasm_encoded=wasm_encoded, generated_js="\n".join(js_lines))
+with open("bot_code.js", "w") as f:
+    f.write(rendered)

gaussian-bots/Cargo.toml

@@ -15,3 +15,6 @@ opt-level = 'z'
 [dependencies]
 js-sys = "0.3.67"
 wasm-bindgen = "0.2.90"
+
+[package.metadata.wasm-pack.profile.release.wasm-bindgen]
+omit-default-module-path = true