* Sanity refactor to clean up common warnings

! ALso using the new common module

api/src/category.rs

@@ -1,7 +1,8 @@
 use serde::Serialize;
 use std::fs::DirEntry;
-use std::{io, env};
+use std::io;
 use rocket::serde::json::Json;
+use crate::common::get_clips_dir;
 
 #[derive(Serialize)]
 pub struct Category {
@@ -15,7 +16,7 @@ pub struct Category {
 struct List {
     categories: Vec<Category>
 }
-fn get_category_dirs(path: &str) -> std::io::Result<Vec<DirEntry>> {
+pub fn get_category_dirs(path: &str) -> std::io::Result<Vec<DirEntry>> {
     let path = std::path::Path::new(path);
     if !path.is_dir() {
         let e = io::Error::new(io::ErrorKind::NotFound, "Unable to open");
@@ -35,10 +36,7 @@ fn get_category_dirs(path: &str) -> std::io::Result<Vec<DirEntry>> {
 pub fn list() -> Json<Vec<Category>> {
     // WARN: misconfigured servers are just going to get shafted and serve up
     // a tonne of 500's
-    let dir = match env::var("CLIPS_DIR") {
-        Ok(val) => val,
-        Err(_) => "/media/clips/".to_string()
-    };
+    let dir = get_clips_dir();
 
     let mut cats: Vec<Category> = Vec::new();
     if let Ok(dirs) = get_category_dirs(&dir) {