27 lines
749 B
Rust
27 lines
749 B
Rust
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use std::{env, fs::File, io::Write};
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const WRITE_ERROR: &str = "cannot write to `config.rs`";
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fn main() {
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// Tell Cargo that if the given environment variable changes, to rerun this build script.
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println!("cargo:rerun-if-env-changed=RHAI_AHASH_SEED");
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let mut f = File::create("src/config.rs").expect("cannot create `config.rs`");
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f.write_fmt(format_args!(
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"//! Configuration settings for this Rhai build
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"
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))
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.expect(WRITE_ERROR);
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let seed = env::var("RHAI_AHASH_SEED").map_or_else(|_| "None".into(), |s| format!("Some({s})"));
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f.write_fmt(format_args!(
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"pub const AHASH_SEED: Option<[u64; 4]> = {seed};\n"
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))
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.expect(WRITE_ERROR);
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f.flush().expect("cannot flush `config.rs`");
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}
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