add GameVars struct

src/var.rs

@@ -1,4 +1,5 @@
 use bevy::prelude::*;
+use std::collections::HashMap;
 use std::env;
 
 pub const DEFAULT_CHAT_SPEED: f32 = 10.0;
@@ -188,3 +189,41 @@ impl Settings {
         ];
     }
 }
+
+#[derive(Resource)]
+struct GameVars {
+    pub db: HashMap<String, String>,
+}
+
+impl GameVars {
+    #[allow(dead_code)]
+    fn get(&self, key: &str) -> Option<String> {
+        if let Some(value) = self.db.get(key) {
+            return Some(value.clone());
+        }
+        return None;
+    }
+
+    #[allow(dead_code)]
+    fn getf(&self, key: &str) -> Option<f64> {
+        if let Some(value) = self.db.get(key) {
+            if let Ok(float) = value.parse::<f64>() {
+                return Some(float);
+            }
+        }
+        return None;
+    }
+
+    #[allow(dead_code)]
+    fn getb(&self, key: &str) -> bool {
+        if let Some(value) = self.db.get(key) {
+            return value != "0";
+        }
+        return false;
+    }
+
+    #[allow(dead_code)]
+    fn set(&mut self, key: &str, value: String) {
+        self.db.insert(key.to_string(), value);
+    }
+}