fix: throw error instead of panicking when expected minitdf file form…

…ats are not found in provided path.

src/file_readers/spectrum_readers/mini_tdf_reader.rs

@@ -14,6 +14,7 @@ use {
     rayon::prelude::*,
     std::path::PathBuf,
 };
+use crate::file_readers::FileFormatError;
 
 #[derive(Debug, Default, Clone)]
 pub struct MiniTDFReader {
@@ -24,15 +25,21 @@ pub struct MiniTDFReader {
     frame_reader: BinFileReader,
 }
 
-fn find_ms2spectrum_file(ms2_dir_path: &str, extension: String) -> String {
+fn find_ms2spectrum_file(ms2_dir_path: &str, extension: String) -> Result<String, FileFormatError> {
     let files = fs::read_dir(ms2_dir_path).unwrap();
     for file in files {
         let filename = file.unwrap().path().file_name().unwrap().to_str().unwrap().to_owned();
         if filename.ends_with( std::format!("ms2spectrum.{}", extension).as_str()) {
-            return filename
+            return Ok(filename)
         }
     }
-    panic!("No '*.ms2spectrum.{}' file found in '{}'", extension, ms2_dir_path)
+    let err =  match extension.as_str() {
+        "parquet" => FileFormatError::MetadataFilesAreMissing,
+        "bin" => FileFormatError::BinaryFilesAreMissing,
+        _ => FileFormatError::BinaryFilesAreMissing
+    };
+    println!("{}", format!("No '*.ms2spectrum.{}' file found in '{}'", extension, ms2_dir_path));
+    return Err(err);
 }
 
 
@@ -48,7 +55,7 @@ impl MiniTDFReader {
 
     fn read_parquet_file_name(&mut self) {
         let mut path: PathBuf = PathBuf::from(&self.path_name);
-        let ms2_parquet_file = find_ms2spectrum_file(&self.path_name, "parquet".to_owned());
+        let ms2_parquet_file = find_ms2spectrum_file(&self.path_name, "parquet".to_owned()).unwrap();
         path.push(ms2_parquet_file);
         self.parquet_file_name = path.to_string_lossy().into_owned();
     }
@@ -59,7 +66,7 @@ impl MiniTDFReader {
     }
     fn set_spectrum_reader(&mut self) {
         let mut path: PathBuf = PathBuf::from(&self.path_name);
-        let ms2_bin_file = find_ms2spectrum_file(&self.path_name, "bin".to_owned());
+        let ms2_bin_file = find_ms2spectrum_file(&self.path_name, "bin".to_owned()).unwrap();
         path.push(ms2_bin_file);
         let file_name: String = path.to_string_lossy().into_owned();
         self.frame_reader =