clego-app/build.rs

use std::error::Error;
use std::fs::{self, File};
use std::io::Write;
use std::path::Path;

use lightningcss::bundler::{Bundler, FileProvider};
use lightningcss::printer::PrinterOptions;
use lightningcss::stylesheet::{MinifyOptions, ParserOptions};

fn main() -> Result<(), Box<dyn Error>> {
    let input_path = Path::new("styles/global.css");
    let output_path = Path::new("public/styles/global.css");

    if let Some(parent) = output_path.parent() {
        fs::create_dir_all(parent)?;
    }

    let fs = FileProvider::new();
    let mut bundler = Bundler::new(&fs, None, ParserOptions::default());

    let mut stylesheet = bundler.bundle(input_path).unwrap();
    let _ = stylesheet.minify(MinifyOptions::default());
    let minified_css = stylesheet.to_css(PrinterOptions {
        minify: true,
        ..PrinterOptions::default()
    });

    let mut output_file = File::create(output_path)?;
    output_file.write_all(minified_css.unwrap().code.as_bytes())?;

    Ok(())
}