76 lines
2.5 KiB
Rust
76 lines
2.5 KiB
Rust
// Builds the Leptos UI (ui/) to wasm and generates the JS bindings, so a plain `cargo run` works.
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// The result lands in OUT_DIR/ui-pkg and is embedded into the binary by src/main.rs.
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use std::path::{Path, PathBuf};
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use std::process::Command;
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use std::{env, fs};
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fn main() {
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for p in ["ui/src", "ui/js", "ui/style.css", "ui/Cargo.toml"] {
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println!("cargo:rerun-if-changed={p}");
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}
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let out = PathBuf::from(env::var_os("OUT_DIR").expect("OUT_DIR"));
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let pkg = out.join("ui-pkg");
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let release = env::var("PROFILE").is_ok_and(|p| p == "release");
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ensure_wasm_target();
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// A separate target dir avoids deadlocking on the outer build's lock.
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let target_dir = out.join("ui-target");
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let mut cargo = Command::new(env::var_os("CARGO").unwrap_or_else(|| "cargo".into()));
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cargo
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.args([
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"build",
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"--manifest-path",
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"ui/Cargo.toml",
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"--target",
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"wasm32-unknown-unknown",
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])
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.env("CARGO_TARGET_DIR", &target_dir)
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// Host rustflags (e.g. -fuse-ld=lld) break the wasm link.
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.env_remove("CARGO_ENCODED_RUSTFLAGS")
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.env_remove("RUSTFLAGS");
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if release {
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cargo.arg("--release");
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}
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let status = cargo
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.status()
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.expect("failed to run cargo for the ui crate");
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assert!(
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status.success(),
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"building ui/ failed (see the cargo output above); the wasm32-unknown-unknown target must be installed: rustup target add wasm32-unknown-unknown"
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);
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let profile = if release { "release" } else { "debug" };
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let wasm = target_dir
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.join("wasm32-unknown-unknown")
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.join(profile)
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.join("ui.wasm");
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let _ = fs::remove_dir_all(&pkg);
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wasm_bindgen_cli_support::Bindgen::new()
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.input_path(&wasm)
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.web(true)
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.expect("bindgen target")
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.out_name("ui")
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.typescript(false)
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.generate(&pkg)
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.expect("wasm-bindgen failed");
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}
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fn ensure_wasm_target() {
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let rustc = env::var_os("RUSTC").unwrap_or_else(|| "rustc".into());
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let sysroot = Command::new(rustc)
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.args(["--print", "sysroot"])
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.output()
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.ok()
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.and_then(|o| String::from_utf8(o.stdout).ok())
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.map(|s| PathBuf::from(s.trim()));
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let installed = sysroot
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.as_deref()
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.is_some_and(|s: &Path| s.join("lib/rustlib/wasm32-unknown-unknown").exists());
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if !installed {
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let _ = Command::new("rustup")
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.args(["target", "add", "wasm32-unknown-unknown"])
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.status();
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}
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}
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