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::{
   9     env,
  10     path::Path,
  11     process::{Command, Output},
  12 };
  13
  14 fn exists_in_path<P>(filename: P) -> bool
  15 where
  16     P: AsRef<Path>,
  17 {
  18     for path in env::split_paths(&env::var_os("PATH").unwrap()) {
  19         if path.join(&filename).is_file() {
  20             return true;
  21         }
  22     }
  23     false
  24 }
  25
  26 fn main() {
  27     println!("cargo:rerun-if-changed=style.scss");
  28
  29     fn run_sass(command: &mut Command) -> Output {
  30         command
  31             .arg("style.scss")
  32             .arg("static/style.css")
  33             .output()
  34             .expect("Unable to compile SASS file, install SASS, see https://sass-lang.com/")
  35     }
  36
  37     let output = if exists_in_path("sass.bat") {
  38         run_sass(Command::new("cmd").args(&["/C", "sass.bat"]))
  39     } else {
  40         run_sass(&mut Command::new("sass"))
  41     };
  42
  43     if !output.status.success() {
  44         // SASS will put the error in the file.
  45         let error =
  46             std::fs::read_to_string("./static/style.css").expect("unable to read style.css");
  47         panic!("{}", error);
  48     }
  49 }