Jean-Gabriel Gill-Couture
ee95a5d1a3
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67 lines
2.7 KiB
Rust
67 lines
2.7 KiB
Rust
//! Best-effort Tailwind CSS build for the `web-frontend` feature.
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//!
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//! When the standalone `tailwindcss` v4 CLI is on PATH and the
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//! `web-frontend` feature is on, this script generates the production
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//! CSS bundle into `$OUT_DIR/tailwind.css`. The binary embeds that file
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//! via `include_bytes!`.
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//!
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//! If the CLI is missing or fails we write an *empty* CSS file rather
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//! than failing the build — the dev workflow uses
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//! `serve-web --css-from <path>` to read Tailwind output from a sidecar
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//! `tailwindcss --watch` process, so the embedded copy is irrelevant
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//! there. Production builds should ensure `tailwindcss` is on PATH; the
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//! warning below shows up in `cargo build` output when it is not.
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use std::path::PathBuf;
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use std::process::Command;
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fn main() {
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let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
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let output = out_dir.join("tailwind.css");
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if std::env::var_os("CARGO_FEATURE_WEB_FRONTEND").is_none() {
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// Feature off — emit an empty placeholder so the `include_bytes!`
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// path in src/frontend/assets.rs still compiles if anything
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// references it (it should be cfg-gated, but belt-and-braces).
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std::fs::write(&output, b"").unwrap();
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return;
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}
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let manifest_dir = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
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let input = manifest_dir.join("style/input.css");
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println!("cargo:rerun-if-changed=style/input.css");
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println!("cargo:rerun-if-changed=src/frontend");
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println!("cargo:rerun-if-changed=src/service");
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let status = Command::new("tailwindcss")
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.arg("--input")
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.arg(&input)
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.arg("--output")
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.arg(&output)
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.arg("--minify")
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.status();
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match status {
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Ok(s) if s.success() => {}
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Ok(s) => {
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println!(
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"cargo:warning=tailwindcss exited with status {s}; embedded CSS will be empty. \
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Install the v4 standalone CLI \
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(https://github.com/tailwindlabs/tailwindcss/releases) for production builds, \
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or use `serve-web --css-from <path>` against a `tailwindcss --watch` sidecar in dev."
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);
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std::fs::write(&output, b"").unwrap();
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}
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Err(e) => {
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println!(
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"cargo:warning=tailwindcss not invocable ({e}); embedded CSS will be empty. \
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Install the v4 standalone CLI \
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(https://github.com/tailwindlabs/tailwindcss/releases) for production builds, \
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or use `serve-web --css-from <path>` against a `tailwindcss --watch` sidecar in dev."
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);
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std::fs::write(&output, b"").unwrap();
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}
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}
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}
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