From 3c3763b71b0a106caa7b53b54101c1fea06e12ef Mon Sep 17 00:00:00 2001
From: Erich Gubler <erichdongubler@gmail.com>
Date: Thu, 8 Jun 2023 15:32:20 -0400
Subject: [PATCH] Add `xtask` for project workflows, but start small with only
 `run-wasm` (#3844)

---
 .cargo/config.toml   |   2 +-
 .gitignore           |   1 +
 Cargo.lock           | 406 +--------------------------
 Cargo.toml           |   2 -
 run-wasm/Cargo.toml  |  11 -
 run-wasm/src/main.rs |   3 -
 xtask/Cargo.lock     | 638 +++++++++++++++++++++++++++++++++++++++++++
 xtask/Cargo.toml     |  16 ++
 xtask/src/cli.rs     |  58 ++++
 xtask/src/main.rs    |  39 +++
 10 files changed, 765 insertions(+), 411 deletions(-)
 delete mode 100644 run-wasm/Cargo.toml
 delete mode 100644 run-wasm/src/main.rs
 create mode 100644 xtask/Cargo.lock
 create mode 100644 xtask/Cargo.toml
 create mode 100644 xtask/src/cli.rs
 create mode 100644 xtask/src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
index daaafd8c8d..95d2a35175 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,5 +1,5 @@
 [alias]
-run-wasm = "run --release --package run-wasm --"
+xtask = "run --manifest-path xtask/Cargo.toml --"
 
 [build]
 rustflags = [
diff --git a/.gitignore b/.gitignore
index fb57a85163..6192f9dede 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 target/
 # Include the root lockfile but not the others
 */Cargo.lock
+!xtask/Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
index 51c9270ca9..61bc98b43a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -144,16 +144,6 @@ dependencies = [
  "rustc-demangle",
 ]
 
-[[package]]
-name = "base64"
-version = "0.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
-dependencies = [
- "byteorder",
- "safemem",
-]
-
 [[package]]
 name = "base64"
 version = "0.13.1"
@@ -254,18 +244,6 @@ dependencies = [
  "vec_map",
 ]
 
-[[package]]
-name = "cargo-run-wasm"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc1e37cf14ef470ed74ec2a8b95e51b8623bcf6f76d24f233ebaeb209f766230"
-dependencies = [
- "devserver_lib",
- "pico-args",
- "serde_json",
- "wasm-bindgen-cli-support",
-]
-
 [[package]]
 name = "cc"
 version = "1.0.77"
@@ -674,12 +652,6 @@ dependencies = [
  "syn 1.0.105",
 ]
 
-[[package]]
-name = "devserver_lib"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edf215dbb8cb1409cca7645aaed35f9e39fb0a21855bba1ac48bc0334903bf66"
-
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -763,17 +735,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "errno"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
-dependencies = [
- "errno-dragonfly",
- "libc",
- "windows-sys 0.48.0",
-]
-
 [[package]]
 name = "errno-dragonfly"
 version = "0.1.2"
@@ -1236,15 +1197,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "heck"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
-dependencies = [
- "unicode-segmentation",
-]
-
 [[package]]
 name = "hermit-abi"
 version = "0.2.6"
@@ -1272,12 +1224,6 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
-[[package]]
-name = "id-arena"
-version = "2.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25a2bc672d1148e28034f176e01fffebb08b35768468cc954630da77a1449005"
-
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -1355,7 +1301,7 @@ checksum = "22e18b0a45d56fe973d6db23972bf5bc46f988a4a2385deac9cc29572f09daef"
 dependencies = [
  "hermit-abi 0.3.1",
  "io-lifetimes",
- "rustix 0.36.8",
+ "rustix",
  "windows-sys 0.45.0",
 ]
 
@@ -1426,12 +1372,6 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
-[[package]]
-name = "leb128"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "884e2677b40cc8c339eaefcb701c32ef1fd2493d71118dc0ca4b6a736c93bd67"
-
 [[package]]
 name = "libc"
 version = "0.2.146"
@@ -1454,12 +1394,6 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f051f77a7c8e6957c0696eac88f26b0117e54f52d3fc682ab19397a8812846a4"
 
-[[package]]
-name = "linux-raw-sys"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d59d8c75012853d2e872fb56bc8a2e53718e2cafe1a4c823143141c6d90c322f"
-
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -1873,7 +1807,7 @@ dependencies = [
  "cfg-if",
  "instant",
  "libc",
- "redox_syscall 0.2.16",
+ "redox_syscall",
  "smallvec",
  "winapi",
 ]
@@ -1886,7 +1820,7 @@ checksum = "7ff9f3fef3968a3ec5945535ed654cb38ff72d7495a25619e2247fb15a2ed9ba"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall 0.2.16",
+ "redox_syscall",
  "smallvec",
  "windows-sys 0.42.0",
 ]
@@ -1913,12 +1847,6 @@ dependencies = [
  "indexmap",
 ]
 
-[[package]]
-name = "pico-args"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5be167a7af36ee22fe3115051bc51f6e6c7054c9348e28deb4f49bd6f705a315"
-
 [[package]]
 name = "pin-project"
 version = "1.0.12"
@@ -2146,15 +2074,6 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
-[[package]]
-name = "redox_syscall"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
-dependencies = [
- "bitflags 1.3.2",
-]
-
 [[package]]
 name = "regex"
 version = "1.7.1"
@@ -2184,18 +2103,11 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "300a51053b1cb55c80b7a9fde4120726ddf25ca241a1cbb926626f62fb136bff"
 dependencies = [
- "base64 0.13.1",
+ "base64",
  "bitflags 1.3.2",
  "serde",
 ]
 
-[[package]]
-name = "run-wasm"
-version = "0.16.0"
-dependencies = [
- "cargo-run-wasm",
-]
-
 [[package]]
 name = "rustc-demangle"
 version = "0.1.21"
@@ -2233,24 +2145,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f43abb88211988493c1abb44a70efa56ff0ce98f233b7b276146f1f3f7ba9644"
 dependencies = [
  "bitflags 1.3.2",
- "errno 0.2.8",
+ "errno",
  "io-lifetimes",
  "libc",
- "linux-raw-sys 0.1.4",
- "windows-sys 0.45.0",
-]
-
-[[package]]
-name = "rustix"
-version = "0.37.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2aae838e49b3d63e9274e1c01833cc8139d3fec468c3b84688c628f44b1ae11d"
-dependencies = [
- "bitflags 1.3.2",
- "errno 0.3.1",
- "io-lifetimes",
- "libc",
- "linux-raw-sys 0.3.1",
+ "linux-raw-sys",
  "windows-sys 0.45.0",
 ]
 
@@ -2269,12 +2167,6 @@ dependencies = [
  "bytemuck",
 ]
 
-[[package]]
-name = "safemem"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
-
 [[package]]
 name = "scoped-tls"
 version = "1.0.1"
@@ -2546,19 +2438,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "tempfile"
-version = "3.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9fbec84f381d5795b08656e4912bec604d162bff9291d6189a78f4c8ab87998"
-dependencies = [
- "cfg-if",
- "fastrand",
- "redox_syscall 0.3.5",
- "rustix 0.37.7",
- "windows-sys 0.45.0",
-]
-
 [[package]]
 name = "termcolor"
 version = "1.2.0"
@@ -2735,12 +2614,6 @@ dependencies = [
  "tinyvec",
 ]
 
-[[package]]
-name = "unicode-segmentation"
-version = "1.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dd624098567895118886609431a7c3b8f516e41d30e0643f03d94592a147e36"
-
 [[package]]
 name = "unicode-width"
 version = "0.1.10"
@@ -2824,32 +2697,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
 
-[[package]]
-name = "walrus"
-version = "0.19.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4eb08e48cde54c05f363d984bb54ce374f49e242def9468d2e1b6c2372d291f8"
-dependencies = [
- "anyhow",
- "id-arena",
- "leb128",
- "log",
- "walrus-macro",
- "wasmparser 0.77.0",
-]
-
-[[package]]
-name = "walrus-macro"
-version = "0.19.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a6e5bd22c71e77d60140b0bd5be56155a37e5bd14e24f5f87298040d0cc40d7"
-dependencies = [
- "heck",
- "proc-macro2",
- "quote",
- "syn 1.0.105",
-]
-
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"
@@ -2887,41 +2734,6 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
-[[package]]
-name = "wasm-bindgen-cli-support"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d4780c659b883a19ddb7ced365db19f7f45cd182d832ee14de2b7ef52e88a9f"
-dependencies = [
- "anyhow",
- "base64 0.9.3",
- "log",
- "rustc-demangle",
- "serde_json",
- "tempfile",
- "unicode-ident",
- "walrus",
- "wasm-bindgen-externref-xform",
- "wasm-bindgen-multi-value-xform",
- "wasm-bindgen-shared",
- "wasm-bindgen-threads-xform",
- "wasm-bindgen-wasm-conventions",
- "wasm-bindgen-wasm-interpreter",
- "wit-text",
- "wit-validator",
- "wit-walrus",
-]
-
-[[package]]
-name = "wasm-bindgen-externref-xform"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d154c3843bf3b635b602ad41b56f505f8f1a25f8a0133fca4bbd0918d74efdc"
-dependencies = [
- "anyhow",
- "walrus",
-]
-
 [[package]]
 name = "wasm-bindgen-futures"
 version = "0.4.34"
@@ -2957,16 +2769,6 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
-[[package]]
-name = "wasm-bindgen-multi-value-xform"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c00a577fbd4be358ef8095432189b5c2e6b6e71f5081797c2032572f77d65d26"
-dependencies = [
- "anyhow",
- "walrus",
-]
-
 [[package]]
 name = "wasm-bindgen-shared"
 version = "0.2.84"
@@ -2997,60 +2799,6 @@ dependencies = [
  "quote",
 ]
 
-[[package]]
-name = "wasm-bindgen-threads-xform"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0aa93941bae037b7b4fac4ecfc132294b828036c5990a806d0e6fd9284297d94"
-dependencies = [
- "anyhow",
- "walrus",
- "wasm-bindgen-wasm-conventions",
-]
-
-[[package]]
-name = "wasm-bindgen-wasm-conventions"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8f5de325048d945c90600fdf66b13521f3340d85971287775c36aa99c04466b"
-dependencies = [
- "anyhow",
- "walrus",
-]
-
-[[package]]
-name = "wasm-bindgen-wasm-interpreter"
-version = "0.2.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f695df44962e3a107436282232a2daa185b8453c16be8ddfb637cd2601f31128"
-dependencies = [
- "anyhow",
- "log",
- "walrus",
- "wasm-bindgen-wasm-conventions",
-]
-
-[[package]]
-name = "wasmparser"
-version = "0.59.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a950e6a618f62147fd514ff445b2a0b53120d382751960797f85f058c7eda9b9"
-
-[[package]]
-name = "wasmparser"
-version = "0.77.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b35c86d22e720a07d954ebbed772d01180501afe7d03d464f413bb5f8914a8d6"
-
-[[package]]
-name = "wast"
-version = "21.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b1844f66a2bc8526d71690104c0e78a8e59ffa1597b7245769d174ebb91deb5"
-dependencies = [
- "leb128",
-]
-
 [[package]]
 name = "wayland-client"
 version = "0.29.5"
@@ -3324,7 +3072,7 @@ version = "0.44.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e745dab35a0c4c77aa3ce42d595e13d2003d6902d6b08c9ef5fc326d08da12b"
 dependencies = [
- "windows-targets 0.42.1",
+ "windows-targets",
 ]
 
 [[package]]
@@ -3346,12 +3094,12 @@ version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
 dependencies = [
- "windows_aarch64_gnullvm 0.42.1",
+ "windows_aarch64_gnullvm",
  "windows_aarch64_msvc 0.42.1",
  "windows_i686_gnu 0.42.1",
  "windows_i686_msvc 0.42.1",
  "windows_x86_64_gnu 0.42.1",
- "windows_x86_64_gnullvm 0.42.1",
+ "windows_x86_64_gnullvm",
  "windows_x86_64_msvc 0.42.1",
 ]
 
@@ -3361,16 +3109,7 @@ version = "0.45.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
 dependencies = [
- "windows-targets 0.42.1",
-]
-
-[[package]]
-name = "windows-sys"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
-dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets",
 ]
 
 [[package]]
@@ -3379,42 +3118,21 @@ version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e2522491fbfcd58cc84d47aeb2958948c4b8982e9a2d8a2a35bbaed431390e7"
 dependencies = [
- "windows_aarch64_gnullvm 0.42.1",
+ "windows_aarch64_gnullvm",
  "windows_aarch64_msvc 0.42.1",
  "windows_i686_gnu 0.42.1",
  "windows_i686_msvc 0.42.1",
  "windows_x86_64_gnu 0.42.1",
- "windows_x86_64_gnullvm 0.42.1",
+ "windows_x86_64_gnullvm",
  "windows_x86_64_msvc 0.42.1",
 ]
 
-[[package]]
-name = "windows-targets"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
-dependencies = [
- "windows_aarch64_gnullvm 0.48.0",
- "windows_aarch64_msvc 0.48.0",
- "windows_i686_gnu 0.48.0",
- "windows_i686_msvc 0.48.0",
- "windows_x86_64_gnu 0.48.0",
- "windows_x86_64_gnullvm 0.48.0",
- "windows_x86_64_msvc 0.48.0",
-]
-
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c9864e83243fdec7fc9c5444389dcbbfd258f745e7853198f365e3c4968a608"
 
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
-
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.36.1"
@@ -3427,12 +3145,6 @@ version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c8b1b673ffc16c47a9ff48570a9d85e25d265735c503681332589af6253c6c7"
 
-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
-
 [[package]]
 name = "windows_i686_gnu"
 version = "0.36.1"
@@ -3445,12 +3157,6 @@ version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de3887528ad530ba7bdbb1faa8275ec7a1155a45ffa57c37993960277145d640"
 
-[[package]]
-name = "windows_i686_gnu"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
-
 [[package]]
 name = "windows_i686_msvc"
 version = "0.36.1"
@@ -3463,12 +3169,6 @@ version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf4d1122317eddd6ff351aa852118a2418ad4214e6613a50e0191f7004372605"
 
-[[package]]
-name = "windows_i686_msvc"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
-
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.36.1"
@@ -3481,24 +3181,12 @@ version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c1040f221285e17ebccbc2591ffdc2d44ee1f9186324dd3e84e99ac68d699c45"
 
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
-
 [[package]]
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+dependencies = [
+ "anyhow",
+ "cargo-run-wasm",
+ "env_logger",
+ "log",
+ "pico-args",
+]
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
new file mode 100644
index 0000000000..343a2166a8
--- /dev/null
+++ b/xtask/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "xtask"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+anyhow = "1.0.71"
+# Current contents filed as a PR here:
+# <https://github.com/rukai/cargo-run-wasm/pull/37>
+cargo-run-wasm = { version = "0.3.2", git = "https://github.com/ErichDonGubler/cargo-run-wasm", branch = "expose-args" }
+env_logger = "0.10.0"
+log = "0.4.18"
+pico-args = { version = "0.5.0", features = ["eq-separator", "short-space-opt", "combined-flags"] }
+
+[workspace]
diff --git a/xtask/src/cli.rs b/xtask/src/cli.rs
new file mode 100644
index 0000000000..924e429b48
--- /dev/null
+++ b/xtask/src/cli.rs
@@ -0,0 +1,58 @@
+use std::process::exit;
+
+use anyhow::{anyhow, bail, Context};
+use pico_args::Arguments;
+
+const HELP: &str = "\
+Usage: xtask <COMMAND>
+
+Commands:
+  run-wasm
+
+Options:
+  -h, --help  Print help
+";
+
+pub(crate) struct Args {
+    pub(crate) subcommand: Subcommand,
+}
+
+impl Args {
+    pub fn parse() -> Self {
+        let mut args = Arguments::from_env();
+        log::debug!("parsing args: {args:?}");
+        if args.contains("--help") {
+            eprint!("{HELP}");
+            // Emulate Cargo exit status:
+            // <https://doc.rust-lang.org/cargo/commands/cargo.html#exit-status>
+            let cargo_like_exit_code = 101;
+            exit(cargo_like_exit_code);
+        }
+        match Subcommand::parse(args).map(|subcommand| Self { subcommand }) {
+            Ok(this) => this,
+            Err(e) => {
+                eprintln!("{:?}", anyhow!(e));
+                exit(1)
+            }
+        }
+    }
+}
+
+pub(crate) enum Subcommand {
+    RunWasm { args: Arguments },
+}
+
+impl Subcommand {
+    fn parse(mut args: Arguments) -> anyhow::Result<Subcommand> {
+        let subcmd = args
+            .subcommand()
+            .context("failed to parse subcommand")?
+            .context("no subcommand specified; see `--help` for more details")?;
+        match &*subcmd {
+            "run-wasm" => Ok(Self::RunWasm { args }),
+            other => {
+                bail!("unrecognized subcommand {other:?}; see `--help` for more details")
+            }
+        }
+    }
+}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
new file mode 100644
index 0000000000..ae00c4e2d6
--- /dev/null
+++ b/xtask/src/main.rs
@@ -0,0 +1,39 @@
+use std::process::ExitCode;
+
+use anyhow::Context;
+use cli::{Args, Subcommand};
+
+mod cli;
+
+fn main() -> ExitCode {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Info)
+        .parse_default_env()
+        .format_indent(Some(0))
+        .init();
+
+    let args = Args::parse();
+
+    match run(args) {
+        Ok(()) => ExitCode::SUCCESS,
+        Err(e) => {
+            log::error!("{e:?}");
+            ExitCode::FAILURE
+        }
+    }
+}
+
+fn run(args: Args) -> anyhow::Result<()> {
+    let Args { subcommand } = args;
+    match subcommand {
+        Subcommand::RunWasm { args } => {
+            cargo_run_wasm::run_wasm_with_css_and_args(
+                "body { margin: 0px; }",
+                cargo_run_wasm::Args::from_args(args)
+                    .map_err(anyhow::Error::msg)
+                    .context("failed to parse arguments for `cargo-run-wasm`")?,
+            );
+            Ok(())
+        }
+    }
+}