made util function for finding files with index

src/utils.rs

@@ -3,6 +3,7 @@ use std::{
     fs,
     io::{self, Write},
     path::Path,
+    process,
 };
 use xdg::BaseDirectories;
 
@@ -118,3 +119,23 @@ pub fn match_file_name(file_name: &str, shelf: &mut Shelf) -> Result<usize, std:
         format!("File not Found in Shelf \"{}\": {file_name}", shelf.name),
     ))
 }
+
+pub fn match_file_name_or_index(file: &str, shelf: &mut Shelf) -> Result<usize, std::io::Error> {
+    let index: usize = match file.parse::<usize>() {
+        Ok(index) => {
+            println!("path is: {}", &shelf.content[*&index]);
+            index
+        }
+        Err(_) => match match_file_name(&file, shelf) {
+            Ok(index) => {
+                println!("path is: {}", &shelf.content[*&index as usize]);
+                index
+            }
+            Err(e) => {
+                eprintln!("{e}");
+                process::exit(1)
+            }
+        },
+    };
+    Ok(index)
+}