Added code to get duration from a flac file

src/properties.rs

@@ -1,9 +1,23 @@
+use lofty::file::AudioFile;
 
 #[derive(Debug, Default, Clone)]
 pub struct Duration {
     pub val: i32
 }
 
-pub fn get_duration(song_path: &String) -> Duration {
-    Duration::default()
+pub fn get_duration(song_path: &String) -> Result<std::time::Duration,std::io::Error> {
+    match std::fs::File::open(song_path) {
+        Ok(mut content) => match lofty::flac::FlacFile::read_from(&mut content, lofty::config::ParseOptions::new(),) {
+            Ok(flac_file) => {
+                let properties = flac_file.properties();
+                Ok(properties.duration())
+            }
+            Err(err) => {
+                Err(std::io::Error::other(err.to_string()))
+            }
+        }
+        Err(err) => {
+            Err(err)
+        }
+    }
 }