fix only process one file.

src/main.rs

@@ -41,7 +41,7 @@ fn process_compressed_files(path: &Path) -> io::Result<()> {
             process_compressed_files(&entry_path)?;
         } else if let Some(ext) = entry_path.extension().and_then(|e| e.to_str()) {
             if ext == "rar" || ext == "zip" {
-                return unar_file(&entry_path);
+                unar_file(&entry_path).expect("UNAR Error.");
             }
         }
     }
@@ -58,6 +58,10 @@ fn main() -> io::Result<()> {
         PathBuf::from(".")
     };
 
+    if start_path.is_file() {
+        return unar_file(&start_path);
+    }
+
     process_compressed_files(&start_path)?;
 
     Ok(())