small fixes, rename

src/main.rs

@@ -4,10 +4,7 @@ mod parsing;
 use anyhow::bail;
 use dotenv::dotenv;
 use rand::{Rng, SeedableRng};
-use serenity::all::{
-    Command, CommandInteraction, CommandOptionType, CreateCommandOption, CreateComponent,
-    FullEvent, Interaction, MessageFlags, ResolvedOption, ResolvedValue,
-};
+use serenity::all::{Command, CommandInteraction, CommandOptionType, CreateCommandOption, CreateComponent, FullEvent, Interaction, InteractionContext, MessageFlags, ResolvedOption, ResolvedValue};
 use serenity::builder::{
     CreateCommand, CreateContainer, CreateContainerComponent, CreateInteractionResponse,
     CreateInteractionResponseFollowup, CreateInteractionResponseMessage, CreateTextDisplay,
@@ -96,7 +93,10 @@ impl EventHandler for Handler {
                             CommandOptionType::String,
                             "seed",
                             "Roll with a fixed seed. This bot uses xoshiro256++.",
-                        )),
+                        ))
+                        .add_context(InteractionContext::Guild)
+                        .add_context(InteractionContext::BotDm)
+                        .add_context(InteractionContext::PrivateChannel),
                 )
                 .await;
 
@@ -189,7 +189,19 @@ pub async fn roll(ctx: &Context, command: &CommandInteraction) -> anyhow::Result
     let seed = fixed_seed.unwrap_or_else(|| rand::rng().next_u64());
     let mut rng = rand_xoshiro::Xoshiro256PlusPlus::seed_from_u64(seed);
 
-    let ev = (expression.average(&mut rng)? * 10.0).round() / 10.0;
+    let average = match expression.average(&mut rng) {
+        Ok(res) => res,
+        Err(err) => {
+            command
+                .create_followup(
+                    &ctx.http,
+                    CreateInteractionResponseFollowup::new().content(format!("{}", err)),
+                )
+                .await?;
+            return Err(err);
+        }
+    };
+    let ev = (average * 10.0).round() / 10.0;
 
     let mut text_components = Vec::with_capacity((repeat + 2) as usize);
     if let Some(description) = description {