Implement volume control

discord-tts-bot/src/main.rs

@@ -14,10 +14,16 @@ pub struct Data {
 }
 
 lazy_static! {
-    static ref NARRATOR: GTTSClient = GTTSClient {
-        volume: 1.0,
+    static ref NARRATOR: GTTSClient = {
+        dotenv::dotenv().expect("Failed to load .env file");
+        GTTSClient {
+            volume: std::env::var("VOLUME")
+                .ok()
+                .and_then(|str| Some(str.parse().unwrap()))
+                .unwrap_or(1.0),
             language: Languages::English,
             tld: "com",
+        }
     };
 }