Add/remove '(ST)' prefix for nickname

src/main.rs

@@ -1,12 +1,16 @@
 use std::{future::Future, io, path::Path};
 
-use ::serenity::all::{ChannelId, GuildId, UserId};
+use ::serenity::all::{ChannelId, EditMember, GuildId, UserId};
 use eyre::{Context as _, Error, OptionExt, Result};
 use futures::{FutureExt, StreamExt, TryStreamExt};
 use poise::serenity_prelude as serenity;
 use rand::seq::SliceRandom;
 use rusqlite::OptionalExtension;
-use tracing_subscriber::{fmt::{self, format::FmtSpan}, layer::SubscriberExt, EnvFilter};
+use tracing_subscriber::{
+    fmt::{self, format::FmtSpan},
+    layer::SubscriberExt,
+    EnvFilter,
+};
 
 #[derive(Copy, Clone)]
 struct GuildData {
@@ -175,7 +179,12 @@ async fn collect(
         .flatten()
         .collect::<Vec<_>>();
 
-    move_users(ctx, guild, users.iter().map(|user| (to, user.user.id)).collect()).await?;
+    move_users(
+        ctx,
+        guild,
+        users.iter().map(|user| (to, user.user.id)).collect(),
+    )
+    .await?;
     futures::future::try_join_all(users.iter().map(|user| guild.move_member(&ctx, user, to)))
         .await?;
 
@@ -253,33 +262,46 @@ async fn join(
 
 #[poise::command(slash_command, ephemeral)]
 #[tracing::instrument]
-async fn st(ctx: Context<'_>, mut spectators: Vec<serenity::UserId>) -> Result<()> {
+async fn st(ctx: Context<'_>) -> Result<()> {
     let guild = ctx
         .guild_id()
         .ok_or_eyre("This bot only works in servers")?;
     let GuildData { st, .. } = ctx.data().get(guild).await?;
-    spectators.push(ctx.author().id);
 
     futures::future::try_join_all(guild.members(&ctx, None, None).await?.into_iter().map(
-        |member| {
-            let spectators = &spectators;
-            async move {
-                match (
-                    spectators.contains(&member.user.id),
-                    member.roles.contains(&st),
-                ) {
-                    (true, true) | (false, false) => Ok(()),
-                    (true, false) => member.add_role(&ctx, st).await,
-                    (false, true) => member.remove_role(&ctx, st).await,
+        |mut member| async move {
+            match (&member.user == ctx.author(), member.roles.contains(&st)) {
+                (true, true) | (false, false) => Ok(()),
+                (true, false) => {
+                    member
+                        .edit(
+                            &ctx,
+                            EditMember::new().nickname(format!("(ST) {}", member.display_name())),
+                        )
+                        .await?;
+                    member.add_role(&ctx, st).await
+                }
+                (false, true) => {
+                    member
+                        .edit(
+                            &ctx,
+                            EditMember::new().nickname(
+                                member
+                                    .display_name()
+                                    .strip_prefix("(ST) ")
+                                    .unwrap_or(member.display_name()),
+                            ),
+                        )
+                        .await?;
+
+                    member.remove_role(&ctx, st).await
                 }
             }
         },
     ))
     .await?;
 
-    ctx.reply(format!("{} members given ST", spectators.len()))
-        .await?;
-
+    ctx.reply("You have been granted ST").await?;
     Ok(())
 }