Add sass function

src/lib.rs

@@ -46,6 +46,22 @@ pub fn lessc (infile: &str, outfile: &str) -> PathBuf {
     full_outfile
 }
 
+pub fn sass (infile: &str, outfile: &str) -> PathBuf {
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let out_dir = Path::new(&out_dir);
+    let full_outfile = out_dir.join(outfile);
+    let status = Command::new("node_modules/.bin/sass")
+            .args(&[infile, full_outfile.to_str().expect("failed to build output path")])
+            .status()
+            .expect("failed to build css bundle");
+
+    if !status.success() {
+        panic!("Failed to sass input file {}", infile);
+    }
+
+    full_outfile
+}
+
 pub struct ResourcesGenerator {
     resources: Vec<Resource>
 }