backend/build.rs

   1 /*
   2 Additionnal build, doc: https://doc.rust-lang.org/cargo/reference/build-scripts.html
   3
   4 What is build here:
   5  - Compile the SASS file to CSS file.
   6 */
   7
   8 use std::{ env, process::{ Command, Output }, path::Path };
   9
  10 fn exists_in_path<P>(filename: P) -> bool
  11     where P: AsRef<Path> {
  12         for path in env::split_paths(&env::var_os("PATH").unwrap()) {
  13             if path.join(&filename).is_file() { return true; }
  14         }
  15     false
  16 }
  17
  18 fn main() {
  19     println!("cargo:rerun-if-changed=style.scss");
  20
  21     fn run_sass(command: &mut Command) -> Output {
  22         command
  23             .arg("style.scss")
  24             .arg("static/style.css")
  25             .output()
  26             .expect("Unable to compile SASS file, install SASS, see https://sass-lang.com/")
  27     }
  28
  29     let output =
  30         if exists_in_path("sass.bat") {
  31             run_sass(Command::new("cmd").args(&["/C", "sass.bat"]))
  32         } else {
  33             run_sass(&mut Command::new("sass"))
  34         };
  35
  36     if !output.status.success() {
  37         // SASS will put the error in the file.
  38         let error = std::fs::read_to_string("./static/style.css").expect("unable to read style.css");
  39         panic!(error);
  40     }
  41 }