Added a utils file

Wanted to separate the higher level config folder stuff from just db module

Because the download module will also want to find cache

scryfall_deser/src/db.rs

@@ -1,23 +1,8 @@
-use dir_spec::Dir;
 use sqlite;
 use std::fs;
 use std::path::PathBuf;
 
-const DATA_FOLDER: &str = "scryfall";
-const SQLITE_FILENAME: &str = "scryfall_db.sqlite3";
-
-fn get_local_data_folder() -> PathBuf {
-    let cache_folder = Dir::data_home();
-    match cache_folder {
-        None => {
-            panic!("Can't find a cache folder - really don't know what the problem is sorry");
-        }
-        Some(mut f) => {
-            f.push(DATA_FOLDER);
-            f
-        }
-    }
-}
+use super::utils::{create_cache_folder, get_local_data_folder, SQLITE_FILENAME};
 
 fn get_local_data_sqlite_file() -> PathBuf {
     let mut folder = get_local_data_folder();
@@ -25,27 +10,6 @@ fn get_local_data_sqlite_file() -> PathBuf {
     folder
 }
 
-// NOTE: this should be idempotent - creating a dir always is... right?
-pub fn create_cache_folder() {
-    let f = get_local_data_folder();
-    let ret = fs::create_dir(&f);
-    match ret {
-        Ok(_) => (),
-        Err(e) => {
-            if e.raw_os_error().unwrap() == 17 {
-                // This is folder already exists - which is fine for us
-                // TODO probably should use e.kind() for better readability
-                return;
-            }
-            panic!(
-                "Couldn't create folder within your cache folder: {}. Error is {}",
-                f.display(),
-                e
-            );
-        }
-    }
-}
-
 fn create_db_sql() -> String {
     "
 CREATE TABLE cards (