64 lines
3.1 KiB
Rust
64 lines
3.1 KiB
Rust
//! Optional craft-fonts build input (see storytold/craft-fonts `docs/integration.md` and
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//! craftrules `standards/fonts.md`).
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//!
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//! With `CRAFT_FONTS_DIR=<craft-fonts checkout>` this embeds every font listed in its
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//! `fonts/manifest.txt` as [`CRAFT_FONTS`](crate::fonts::CRAFT_FONTS); unset, `CRAFT_FONTS` is
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//! empty and nothing else changes. A `CRAFT_FONTS_DIR` that is not a checkout is a warning, or an
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//! error with `CRAFT_FONTS_REQUIRED=1` (release builds).
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//!
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//! Native builds embed every font. The web (wasm32) build embeds only the UI font (BIZ UDPGothic
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//! Regular, ~4.5 MB) to stay under the web size budget (Cloudflare serves files up to 25 MiB).
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//! Only the local directory is read: no network.
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use std::fmt::Write as _;
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use std::path::PathBuf;
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fn main() {
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println!("cargo::rerun-if-changed=build.rs");
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println!("cargo::rerun-if-env-changed=CRAFT_FONTS_DIR");
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println!("cargo::rerun-if-env-changed=CRAFT_FONTS_REQUIRED");
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let mut src = String::from("pub static CRAFT_FONTS: &[CraftFont] = &[\n");
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if let Some(dir) = std::env::var_os("CRAFT_FONTS_DIR").map(PathBuf::from) {
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match craft_fonts(&dir) {
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Ok(entries) => src.push_str(&entries),
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Err(e) if std::env::var_os("CRAFT_FONTS_REQUIRED").is_some() => {
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println!("cargo::error=CRAFT_FONTS_DIR={}: {e}", dir.display());
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}
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Err(e) => println!("cargo::warning=building without craft-fonts: CRAFT_FONTS_DIR={}: {e}", dir.display()),
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}
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}
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src.push_str("];\n");
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let out = PathBuf::from(std::env::var_os("OUT_DIR").unwrap_or_default()).join("craft_fonts.rs");
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if let Err(e) = std::fs::write(&out, src) {
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println!("cargo::error=writing {}: {e}", out.display());
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}
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}
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/// One `CraftFont { .. }` initialiser per manifest line.
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fn craft_fonts(dir: &std::path::Path) -> Result<String, String> {
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let manifest = dir.join("fonts/manifest.txt");
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println!("cargo::rerun-if-changed={}", manifest.display());
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let text = std::fs::read_to_string(&manifest).map_err(|e| format!("{}: {e}", manifest.display()))?;
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let wasm = std::env::var("CARGO_CFG_TARGET_ARCH").as_deref() == Ok("wasm32");
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let mut out = String::new();
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for line in text.lines().map(str::trim).filter(|l| !l.is_empty() && !l.starts_with('#')) {
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let f: Vec<&str> = line.split(" | ").map(str::trim).collect();
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let [family, style, file, scripts, ..] = f.as_slice() else {
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return Err(format!("malformed manifest line: {line}"));
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};
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if wasm && !(*family == "BIZ UDPGothic" && *style == "Regular") {
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continue;
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}
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let path = dir.join(file).canonicalize().map_err(|e| format!("{file}: {e}"))?;
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println!("cargo::rerun-if-changed={}", path.display());
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let scripts: Vec<String> = scripts.split(',').map(|s| format!("{:?}", s.trim())).collect();
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let _ = writeln!(
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out,
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" CraftFont {{ family: {family:?}, style: {style:?}, scripts: &[{}], bytes: include_bytes!({:?}) }},",
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scripts.join(", "),
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path.display().to_string(),
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);
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}
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Ok(out)
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}
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