Update to wit-bindgen 0.20.0 (#80)

* Update to wit-bindgen 0.20.0

This commit updates the bindings generator to 0.20.0 and refactors the
existing support for exporting macros to use the new features of 0.20.0
as well. The `macros` crate feature is now no longer required (yay!) and
all the traits to implement are already present in the crate now.

* Add more generated files to gitattributes

* Remove macros feature from CI

* Fix regenerate script

* Rename macros back to their old names

* Document some internal structure

* More internal comments

* Rename command macro

* Fix doc test

Author: alexcrichton

.gitattributes

@@ -1,5 +1,7 @@
-# This is generated by `wit-bindgen`
+# These are generated by `wit-bindgen`
 src/bindings.rs linguist-generated=true
+src/proxy.rs linguist-generated=true
+src/command.rs linguist-generated=true
 
 # This is copied from other repos so diffs aren't super interesting by default
 wit/deps linguist-generated=true

.github/workflows/main.yml

@@ -17,6 +17,7 @@ jobs:
     - run: cargo build --no-default-features
     - run: cargo build --target wasm32-wasi
     - run: cargo build --target wasm32-wasi --no-default-features
+    - run: cargo test --doc
     - name: Install Wasmtime
       uses: bytecodealliance/actions/wasmtime/setup@v1
       with:
@@ -29,7 +30,7 @@ jobs:
     - run: curl -LO https://github.com/bytecodealliance/wasmtime/releases/download/v17.0.0/wasi_snapshot_preview1.command.wasm
     - run: wasm-tools component new ./target/wasm32-wasi/debug/examples/hello-world.wasm --adapt ./wasi_snapshot_preview1.command.wasm -o component.wasm
     - run: wasmtime run component.wasm
-    - run: cargo build --examples --target wasm32-unknown-unknown --features macros
+    - run: cargo build --examples --target wasm32-unknown-unknown
     - run: wasm-tools component new ./target/wasm32-unknown-unknown/debug/examples/cli_command.wasm -o component.wasm
     - run: wasmtime run component.wasm
     - run: wasm-tools component new ./target/wasm32-unknown-unknown/debug/examples/http_proxy.wasm -o component.wasm
@@ -52,6 +53,6 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install Rust
       run: rustup update stable && rustup default stable
-    - run: cargo install wit-bindgen-cli@0.19.2 --locked
+    - run: cargo install wit-bindgen-cli@0.20.0 --locked
     - run: ./ci/regenerate.sh
     - run: git diff --exit-code

Cargo.toml

@@ -12,35 +12,26 @@ readme = "README.md"
 documentation = "https://docs.rs/wasi"
 
 [dependencies]
-wit-bindgen = { version = "0.19.1", default-features = false, features = ['realloc'] }
+wit-bindgen = { version = "0.20.0", default-features = false, features = ['realloc'] }
 
 # When built as part of libstd
 compiler_builtins = { version = "0.1", optional = true }
 core = { version = "1.0", optional = true, package = "rustc-std-workspace-core" }
 rustc-std-workspace-alloc = { version = "1.0", optional = true }
 
-[build-dependencies]
-quote = { version = "1.0", optional = true }
-
 [features]
 default = ["std"]
 std = []
-macros = ["quote", "wit-bindgen/macros"]
 # Unstable feature to support being a libstd dependency
 rustc-dep-of-std = ["compiler_builtins", "core", "rustc-std-workspace-alloc"]
 
-[package.metadata.docs.rs]
-features = ["macros"]
-
 [[example]]
 name = "cli-command"
 crate-type = ["cdylib"]
-required-features = ["macros"]
 
 [[example]]
 name = "http-proxy"
 crate-type = ["cdylib"]
-required-features = ["macros"]
 
 [badges]
-maintenance = { status = "experimental" }
+maintenance = { status = "experimental" }

build.rs

@@ -2,14 +2,81 @@
 
 set -ex
 
-wit-bindgen rust wit --out-dir src --std-feature --type-section-suffix rust-wasi-from-crates-io
+generate() {
+  file="$1"
+  shift
+  wit-bindgen rust wit --out-dir src --std-feature "$@"
 
-# rustfmt chokes on the raw output of wit-bindgen right now due to trailling
-# whitespace (unsure as to why), so format it with some options first to get it
-# into a better state before applying the final format with default options
-# which gets this to succeed.
+  # rustfmt chokes on the raw output of wit-bindgen right now due to trailling
+  # whitespace (unsure as to why), so format it with some options first to get it
+  # into a better state before applying the final format with default options
+  # which gets this to succeed.
+  #
+  # NB: this should be considered a bug in wit-bindgen that this is required to do
+  # twice. Passing `--rustfmt` to `wit-bindgen` should work.
+  rustfmt $file --edition 2021 --config-path ./ci/rustfmt-bindings.toml
+  rustfmt $file --edition 2021
+}
+
+# Generate the main body of the bindings which includes all imports from the two
+# worlds below.
+generate src/bindings.rs --type-section-suffix rust-wasi-from-crates-io
+
+# Generate bindings for the `wasi:cli/command` world specifically, namely the
+# macro `export_command`.
 #
-# NB: this should be considered a bug in wit-bindgen that this is required to do
-# twice. Passing `--rustfmt` to `wit-bindgen` should work.
-rustfmt src/bindings.rs --edition 2021 --config-path ./ci/rustfmt-bindings.toml
-rustfmt src/bindings.rs --edition 2021
+# Note that `--with` is used to point at the previously generated bindings.
+with="wasi:cli/[email protected]=crate::cli::environment"
+with="$with,wasi:cli/[email protected]=crate::cli::exit"
+with="$with,wasi:cli/[email protected]=crate::cli::stdin"
+with="$with,wasi:cli/[email protected]=crate::cli::stdout"
+with="$with,wasi:cli/[email protected]=crate::cli::stderr"
+with="$with,wasi:cli/[email protected]=crate::cli::terminal_input"
+with="$with,wasi:cli/[email protected]=crate::cli::terminal_output"
+with="$with,wasi:cli/[email protected]=crate::cli::terminal_stdin"
+with="$with,wasi:cli/[email protected]=crate::cli::terminal_stdout"
+with="$with,wasi:cli/[email protected]=crate::cli::terminal_stderr"
+with="$with,wasi:clocks/[email protected]=crate::clocks::monotonic_clock"
+with="$with,wasi:clocks/[email protected]=crate::clocks::wall_clock"
+with="$with,wasi:filesystem/[email protected]=crate::filesystem::types"
+with="$with,wasi:filesystem/[email protected]=crate::filesystem::preopens"
+with="$with,wasi:io/[email protected]=crate::io::error"
+with="$with,wasi:io/[email protected]=crate::io::poll"
+with="$with,wasi:io/[email protected]=crate::io::streams"
+with="$with,wasi:random/[email protected]=crate::random::random"
+with="$with,wasi:random/[email protected]=crate::random::insecure"
+with="$with,wasi:random/[email protected]=crate::random::insecure_seed"
+with="$with,wasi:sockets/[email protected]=crate::sockets::network"
+with="$with,wasi:sockets/[email protected]=crate::sockets::instance_network"
+with="$with,wasi:sockets/[email protected]=crate::sockets::tcp"
+with="$with,wasi:sockets/[email protected]=crate::sockets::tcp_create_socket"
+with="$with,wasi:sockets/[email protected]=crate::sockets::udp"
+with="$with,wasi:sockets/[email protected]=crate::sockets::udp_create_socket"
+with="$with,wasi:sockets/[email protected]=crate::sockets::ip_name_lookup"
+generate src/command.rs \
+  --world wasi:cli/command \
+  --with "$with" \
+  --type-section-suffix rust-wasi-from-crates-io-command-world \
+  --default-bindings-module wasi \
+  --pub-export-macro \
+  --export-macro-name _export_command
+
+# Same as the `command` world, but for the proxy world.
+with="wasi:cli/[email protected]=crate::cli::stdin"
+with="$with,wasi:cli/[email protected]=crate::cli::stdout"
+with="$with,wasi:cli/[email protected]=crate::cli::stderr"
+with="$with,wasi:clocks/[email protected]=crate::clocks::monotonic_clock"
+with="$with,wasi:clocks/[email protected]=crate::clocks::wall_clock"
+with="$with,wasi:io/[email protected]=crate::io::error"
+with="$with,wasi:io/[email protected]=crate::io::poll"
+with="$with,wasi:io/[email protected]=crate::io::streams"
+with="$with,wasi:random/[email protected]=crate::random::random"
+with="$with,wasi:http/[email protected]=crate::http::types"
+with="$with,wasi:http/[email protected]=crate::http::outgoing_handler"
+generate src/proxy.rs \
+  --world wasi:http/proxy \
+  --with "$with" \
+  --type-section-suffix rust-wasi-from-crates-io-proxy-world \
+  --default-bindings-module wasi \
+  --pub-export-macro \
+  --export-macro-name _export_proxy

ci/regenerate.sh

@@ -1,8 +1,8 @@
-wasi::cli::run::export!(Example);
+wasi::cli::command::export!(Example);
 
 struct Example;
 
-impl exports::wasi::cli::run::Guest for Example {
+impl wasi::exports::cli::run::Guest for Example {
     fn run() -> Result<(), ()> {
         let stdout = wasi::cli::stdout::get_stdout();
         stdout.blocking_write_and_flush(b"Hello, WASI!").unwrap();

examples/cli-command.rs

@@ -2,11 +2,11 @@ use wasi::http::types::{
     Fields, IncomingRequest, OutgoingBody, OutgoingResponse, ResponseOutparam,
 };
 
-wasi::http::incoming_handler::export!(Example);
+wasi::http::proxy::export!(Example);
 
 struct Example;
 
-impl exports::wasi::http::incoming_handler::Guest for Example {
+impl wasi::exports::http::incoming_handler::Guest for Example {
     fn handle(_request: IncomingRequest, response_out: ResponseOutparam) {
         let resp = OutgoingResponse::new(Fields::new());
         let body = resp.body().unwrap();