parameters 0.2.7

Automatic replace variables in configuration file templates from environment variables.
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use std::env::var_os;
use std::fs::write;
use std::path::Path;

fn main() {
    let content = format!(
r#"
const APP_NAME: &'static str = env!("CARGO_PKG_NAME");
const APP_VERSION: &'static str = env!("CARGO_PKG_VERSION");
const APP_AUTHORS: &'static str = env!("CARGO_PKG_AUTHORS");
const APP_HOMEPAGE: &'static str = env!("CARGO_PKG_HOMEPAGE");
const APP_BUILD_AT: &'static str = "{}";
"#, chrono::Utc::now().format("%Y-%m-%d %H:%M:%S %Z"));

    let out_dir = var_os("OUT_DIR").unwrap();
    let dest_path = Path::new(&out_dir).join("config.rs");
    write(&dest_path, content).unwrap();

    println!("cargo:rerun-if-changed=build.rs");
}