Tahinli/forge

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1	//! Compiles style/main.scss into OUT_DIR and emits FORGE_BUILD_SHA for the binary. Each static
2	//! asset also gets a content hash (FORGE_MAIN_CSS_V, FORGE_NAV_JS_V) that the page links use as
3	//! their cache-busting query, so an unchanged file keeps its URL and a changed one gets a new one.
4
5	use std::{env, fs, path::PathBuf};
6
7	use hex::encode;
8	use sha2::{Digest, Sha256};
9
10	/// First 12 hex characters of the SHA-256 of `bytes`.
11	fn content_version(bytes: &[u8]) -> String {
12	encode(Sha256::digest(bytes))[..12].to_string()
13	}
14
15	fn main() {
16	println!("cargo:rerun-if-env-changed=FORGE_BUILD_SHA");
17	println!("cargo:rerun-if-changed=../../style");
18	println!("cargo:rerun-if-changed=assets/nav.js");
19
20	let sha = env::var("FORGE_BUILD_SHA").unwrap_or_else(\|_\| "dev".to_string());
21	println!("cargo:rustc-env=FORGE_BUILD_SHA={sha}");
22
23	let manifest =
24	PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR is set by cargo"));
25	let out = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR is set by cargo"));
26	let css = grass::from_path(
27	manifest.join("../../style/main.scss"),
28	&grass::Options::default(),
29	)
30	.unwrap_or_else(\|e\| panic!("compiling style/main.scss: {e}"));
31	println!(
32	"cargo:rustc-env=FORGE_MAIN_CSS_V={}",
33	content_version(css.as_bytes())
34	);
35	fs::write(out.join("main.css"), css).expect("writing compiled stylesheet to OUT_DIR");
36
37	let nav = fs::read(manifest.join("assets/nav.js")).expect("reading assets/nav.js");
38	println!("cargo:rustc-env=FORGE_NAV_JS_V={}", content_version(&nav));
39	}