embassy/embassy-stm32/build.rs

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Rust
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use regex::Regex;
use std::fmt::Write as _;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
use std::{env, fs};
fn main() {
let chip = env::vars_os()
.map(|(a, _)| a.to_string_lossy().to_string())
.find(|x| x.starts_with("CARGO_FEATURE_STM32"))
.expect("No stm32xx Cargo feature enabled")
.strip_prefix("CARGO_FEATURE_")
.unwrap()
.to_ascii_lowercase();
let mut device_x = String::new();
let chip_rs = fs::read_to_string(format!("src/pac/{}.rs", chip)).unwrap();
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let re = Regex::new("declare!\\(([a-zA-Z0-9_]+)\\)").unwrap();
for c in re.captures_iter(&chip_rs) {
let name = c.get(1).unwrap().as_str();
write!(&mut device_x, "PROVIDE({} = DefaultHandler);\n", name).unwrap();
}
let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
File::create(out.join("device.x"))
.unwrap()
.write_all(device_x.as_bytes())
.unwrap();
println!("cargo:rustc-link-search={}", out.display());
println!("cargo:rerun-if-changed=src/pac/{}.rs", chip);
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println!("cargo:rerun-if-changed=build.rs");
}