Support command line parameters

src/Tools/tool_helper/src/lib.rs

@@ -100,13 +100,13 @@ impl<T: ErrorString> std::convert::From<T> for Error {
     }
 }
 
-pub fn open_output_file(output_path: PathBuf) -> Result<BufWriter<std::fs::File>, Error> {
+pub fn open_output_file(output_path: &PathBuf) -> Result<BufWriter<std::fs::File>, Error> {
     Ok(std::io::BufWriter::new(std::fs::File::create(output_path)?))
 }
 
 pub fn open_output(output_file: Option<PathBuf>) -> Result<Output, Error> {
     match output_file {
-        Some(output_path) => Ok(Box::new(open_output_file(output_path)?)),
+        Some(output_path) => Ok(Box::new(open_output_file(&output_path)?)),
         None              => Ok(Box::new(BufWriter::new(std::io::stdout()))),
     }
 }