add xtask command to build - needs cargo 1.91.0

rust-lang/cargo#15838

Author: rectalogic

.cargo/config.toml

@@ -1,2 +1,6 @@
 [build]
 target = "wasm32-unknown-unknown"
+
+[alias]
+# XXX requires https://github.com/rust-lang/cargo/pull/15838
+xtask = "run --target host --manifest-path ./xtask/Cargo.toml --"

Cargo.lock

@@ -1,5 +1,5 @@
 [workspace]
-members = ["examples/cubes", "examples/simple"]
+members = ["xtask", "examples/simple", "examples/cubes"]
 
 [workspace.package]
 version = "0.2.0"

Cargo.toml

@@ -7,7 +7,11 @@ See [examples/cubes/src/lib.rs](examples/cubes/src/lib.rs) for example use.
 
 To run the demo locally:
 ```sh-session
-$ cargo install wasm-pack
-$ wasm-pack build --target web examples/cubes --features webgpu
+$ cargo install wasm-opt wasm-bindgen-cli
+$ cargo build --profile debug --target wasm32-unknown-unknown --example cubes
+$ wasm-bindgen --out-dir examples/wasm/target --out-name wasm_example --target web target/wasm32-unknown-unknown/debug/examples/{example}.wasm
+$ wasm-opt -Oz --output examples/wasm/target/wasm_example_bg.wasm.optimized examples/wasm/target/wasm_example_bg.wasm
+# rename wasm.optimized
 $ python3 -m http.server -d examples/cubes  # now open http://localhost:8000/
 ```
+XXX see https://github.com/bevyengine/bevy/blob/6608d9815da46e1c79ec3887568a068e63065f49/tools/build-wasm-example/src/main.rs

README.md

@@ -1,4 +1,4 @@
 [toolchain]
 channel = "stable"
-targets = [ "wasm32-unknown-unknown" ]
-
+targets = ["wasm32-unknown-unknown"]
+components = ["rust-analyzer", "clippy"]

rust-toolchain.toml

@@ -0,0 +1,9 @@
+[package]
+name = "xtask"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+anyhow = "1.0.99"
+clap = { version = "4.5.46", features = ["derive"] }
+xshell = "0.2.7"