create log and patch directories if they're missing

src/bin/main.rs

@@ -15,6 +15,17 @@ use elseware::entity::item::{NewItemEntity, ItemDetail, InventoryItemEntity};
 use elseware::entity::item;
 
 fn setup_logger() {
+    match std::fs::create_dir("log") {
+        Ok(()) => {},
+        Err(e) => {
+            match e.kind() {
+                std::io::ErrorKind::AlreadyExists => {}, // false error
+                _ => { // real error
+                    panic!("Failed to create \"log\" directory.\n{:?}", e);
+                },
+            }
+        },
+    };
     let colors = fern::colors::ColoredLevelConfig::new()
         .error(fern::colors::Color::Red)
         .warn(fern::colors::Color::Yellow)

src/patch/patch.rs

@@ -217,7 +217,22 @@ impl ServerState for PatchServerState {
 }
 
 fn load_patch_dir(basedir: &str, patchbase: &str, file_ids: &mut HashMap<u32, PatchFile>) -> PatchFileTree {
-    let paths = fs::read_dir(basedir).expect("could not read directory");
+    let paths = {
+        match fs::read_dir(basedir) {
+            Ok(p) => p,
+            Err(e) => {
+                match e.kind() {
+                    std::io::ErrorKind::NotFound => { // attempt to create the missing directory
+                        match std::fs::create_dir(basedir) {
+                            Ok(_) => fs::read_dir(basedir).expect("could not read newly created directory"), // created patch directory successfully. return it to paths
+                            Err(ee) => panic!("Failed to create directory \"{}\".\n{:?}", basedir, ee), // we already know the path doesnt exist so no need to check for AlreadyExists error. panic
+                        }
+                    },
+                    _ => panic!("Unable to read directory \"{}\".\n{:?}", basedir, e),
+                }
+            },
+        }
+    };
 
     let mut files = Vec::new();
     let mut dirs = Vec::new();