enso/lib/rust/ensogl/component/text/msdf-sys/build.rs

53 lines
1.9 KiB
Rust

//! Downloader and patch for msdfgen library.
mod msdfgen_wasm {
use enso_build_utilities::GithubRelease;
use std::fs;
use std::io::Write;
use std::path;
pub const PACKAGE: GithubRelease<&str> = GithubRelease {
project_url: "https://github.com/enso-org/msdfgen-wasm",
version: "v1.1",
filename: "msdfgen_wasm.js",
};
/// Downloads the msdfgen package.
///
/// **Note**
/// In theory, build.rs scripts should create and modify files in OUT_DIR only, but we haven't
/// found any way to make `#[wasm_bindgen(module="...")]` taking a file from OUT_DIR (except by
/// providing a full system path, which is obviously awful).
///
/// If you find and implement a better way to downloading js snippets, please
/// remember to remove msdfgen_wasm.js entry from the .gitignore file.
pub fn download() {
PACKAGE.download(path::Path::new("."))
}
const PATCH_LINE: &str = "; export { ccall, getValue, _msdfgen_getKerning,\
_msdfgen_generateAutoframedMSDF, _msdfgen_result_getMSDFData,\
_msdfgen_result_getAdvance, _msdfgen_result_getTranslation,\
_msdfgen_result_getScale, _msdfgen_freeResult, _msdfgen_freeFont,\
addInitializationCb, isInitialized }";
/// Patches downloaded msdfgen_wasm.js file.
///
/// For some reason, for wasm-bindgen test on browsers the function must be explicitly exported.
/// Examples works without this perfectly.
pub fn patch_for_wasm_bindgen_test() {
let path = path::Path::new(&PACKAGE.filename);
let mut open_options = fs::OpenOptions::new();
open_options.append(true);
let mut file = open_options.open(path).unwrap();
file.write_all(PATCH_LINE.as_bytes()).unwrap();
}
}
fn main() {
println!("cargo:rerun-if-changed=build.rs");
msdfgen_wasm::download();
msdfgen_wasm::patch_for_wasm_bindgen_test();
}