make a better env parser

src/main.rs

@@ -1,15 +1,35 @@
-use poise::serenity_prelude as serenity;
+use poise::serenity_prelude::{self as serenity, GatewayIntents};
 use dotenv;
 mod command;
 
 pub struct Data {} // User data, which is stored and accessible in all command invocations
 type Context<'a> = poise::Context<'a, Data, anyhow::Error>;
 
+const DISCORD_INTENTS: &'static str = "DISCORD_INTENTS";
+const DISCORD_TOKEN: &'static str = "DISCORD_TOKEN";
+const DISCORD_ID: &'static str = "DISCORD_ID";
+
 #[tokio::main]
 async fn main() {
+    // ======================================== READ ENV ======================================== 
     dotenv::dotenv().ok();
-    let token = std::env::var("DISCORD_TOKEN").expect("missing DISCORD_TOKEN");
-
+    let id: String = std::env::var(DISCORD_ID).expect(&format!("ERROR: Missing {DISCORD_ID}"));
+    let token: String = std::env::var(DISCORD_TOKEN).expect(&format!("ERROR: Missing {DISCORD_TOKEN}"));
+    let perm_env: String = std::env::var(DISCORD_INTENTS)
+        .unwrap_or_else(|msg| {
+            println!("DEBUG: what is: {msg}");
+            println!("ERROR: Missing {DISCORD_INTENTS}");
+            "0".to_string()
+        });
+    // parse into u64, then into GatewayIntents
+    let perm_u64 = perm_env.parse::<u64>().unwrap_or(0u64);
+    let intents: GatewayIntents = GatewayIntents::from_bits(perm_u64).unwrap_or(GatewayIntents::empty());
+    // Re-build into string, just incase it has changed
+    let perm_string = intents.bits().to_string();
+    // ======================================== ENV DONE ======================================== 
+     
+    // Generate sick text like this: 
+    // http://www.patorjk.com/software/taag/#p=testall&f=Graffiti&t=hello%20world
     println!(r#"
 
      /$$$$$$$$                                /$$             /$$                     /$$$$$$$              /$$    
@@ -26,12 +46,15 @@ async fn main() {
                                                                                                                         
     Template Bot.
     Invite this bot with:
+
+    https://discord.com/api/oauth2/authorize?client_id={id}&permissions={perm_string}&scope=bot
     
     "#);
     
+    // Use bitlogic "OR" to combine different intents.
     let intents =
-        serenity::GatewayIntents::GUILD_VOICE_STATES |
-        serenity::GatewayIntents::non_privileged();
+        intents |
+        GatewayIntents::non_privileged();
 
 
     let framework = poise::Framework::builder()