Use compressed WASM for even smaller webroot size

Makefile

@@ -17,19 +17,19 @@ SRCS := $(wildcard $(SRC_DIR)/**)
 
 # "Standalone" version
 # (i.e., it includes an index.html so it can be placed on a server as-is)
-web-standalone: out/boids.js out/boids_bg.wasm out/index.html
+web-standalone: out/boids.js out/boids_bg.wasm.gz out/index.html
 
 # "Bundle-able" version. The host site must provide it's own HTML page.
-web: out/boids.js out/boids_bg.wasm out/boids.html
+web: out/boids.js out/boids_bg.wasm.gz out/boids.html
 
 tarball: boids_web_root.tar
 
 tarball_standalone: boids_web_root_standalone.tar
 
-boids_web_root.tar: out/boids.js out/boids_bg.wasm out/boids.html
+boids_web_root.tar: out/boids.js out/boids_bg.wasm.gz out/boids.html
 	tar -caf $@ $^
 
-boids_web_root_standalone.tar: out/boids.js out/boids_bg.wasm out/index.html
+boids_web_root_standalone.tar: out/boids.js out/boids_bg.wasm.gz out/index.html
 	tar -caf $@ $^
 
 target/$(CARGO_TARGET)/$(CARGO_PROFILE)/another-boids-in-rust.wasm: $(SRCS) Cargo.lock Cargo.toml
@@ -40,8 +40,9 @@ out:
 
 # Both the JS and WASM files are generated by the wasm-bindgen call, so both
 # get to be on the target half of this recipe.
-out/boids.js out/boids_bg.wasm &: target/$(CARGO_TARGET)/$(CARGO_PROFILE)/another-boids-in-rust.wasm | out
+out/boids.js out/boids_bg.wasm.gz &: target/$(CARGO_TARGET)/$(CARGO_PROFILE)/another-boids-in-rust.wasm | out
 	wasm-bindgen --no-typescript --target web --out-dir ./out/ --out-name boids target/$(CARGO_TARGET)/$(CARGO_PROFILE)/another-boids-in-rust.wasm
+	gzip -9 -f out/boids_bg.wasm
 
 # Copies the index page to the output
 out/index.html: www/index.html
@@ -68,5 +69,5 @@ full-clean: clean
 install: web
 	install -dm0755 $(DESTDIR)
 	install -m0644 out/boids.js $(DESTDIR)/
-	install -m0644 out/boids_bg.wasm $(DESTDIR)/
+	install -m0644 out/boids_bg.wasm.gz $(DESTDIR)/
 	install -m0644 out/boids.html $(DESTDIR)/

www/index.html

@@ -112,7 +112,11 @@
   <script type="module">
     import init from './boids.js'
 
-    init().catch((error) => {
+    let compressed = await fetch("./boids_bg.wasm.gz")
+    let wasm_stream = compressed.body.pipeThrough(new DecompressionStream("gzip"))
+    let blob = await new Response(wasm_stream).blob();
+
+    init(await blob.arrayBuffer()).catch((error) => {
       if (!error.message.startsWith("Using exceptions for control flow, don't mind me. This isn't actually an error!")) {
         throw error;
       }