initial version

.gitignore

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+/target
+**/*.rs.bk

Cargo.toml

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+[package]
+name = "rgbot"
+version = "0.1.0"
+authors = ["Robin Appelman <robin@icewind.nl>"]
+edition = "2018"
+
+[dependencies]
+serenity = { version = "0.6.0-rc.1", features = ["cache"], path = "../serenity" }
+regex = "1.1"
+err-derive = "0.1"
+env_logger = "~0.4"
+log = "~0.3"

src/main.rs

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+use std::env;
+
+use serenity::{
+    model::{channel::Message, gateway::Ready},
+    utils::Colour,
+    prelude::*,
+    Error as DiscordError,
+};
+use regex::Regex;
+use serenity::model::guild::{Role, Guild};
+use serenity::model::id::RoleId;
+use err_derive::Error;
+use serenity::model::user::User;
+use std::u8;
+use std::sync::Arc;
+
+#[derive(Debug, Error)]
+enum BotError {
+    #[error(display = "missing \"colors\" base role")]
+    NoColorRole,
+    #[error(display = "discord error: {}", _0)]
+    DiscordError(#[error(cause)] DiscordError),
+}
+
+impl From<DiscordError> for BotError {
+    fn from(f: DiscordError) -> Self {
+        BotError::DiscordError(f)
+    }
+}
+
+type Result<T> = std::result::Result<T, BotError>;
+
+struct Handler {
+    color_regex: Regex
+}
+
+impl Handler {
+    pub fn new() -> Self {
+        Handler {
+            color_regex: Regex::new(r"^#([A-Fa-f0-9]{2})([A-Fa-f0-9]{2})([A-Fa-f0-9]{2})$").unwrap()
+        }
+    }
+
+    fn parse_color(&self, msg: &str) -> Option<Colour> {
+        let captures = self.color_regex.captures(msg)?;
+        let r = u8::from_str_radix(captures.get(1).unwrap().as_str(), 16).unwrap();
+        let g = u8::from_str_radix(captures.get(2).unwrap().as_str(), 16).unwrap();
+        let b = u8::from_str_radix(captures.get(3).unwrap().as_str(), 16).unwrap();
+        Some(Colour::from_rgb(r, g, b))
+    }
+
+    fn get_color_role_position(&self, guild: &Guild) -> Result<u8> {
+        guild.role_by_name("colors").map(|r| r.position as u8)
+            .ok_or(BotError::NoColorRole)
+    }
+
+    fn get_or_create_role(&self, context: &Context, color: Colour, guild: &RwLock<Guild>) -> Result<Role> {
+        let name = format!("#{}", color.hex());
+        let color_position = self.get_color_role_position(&mut guild.read())?;
+        dbg!(&color_position);
+        if let Some(role) = guild.read().role_by_name(&name) {
+            return Ok(role.clone());
+        }
+
+        let role = guild.write().create_role(context, |r| r
+            .name(&name)
+            .colour(color.0 as u64)
+            .position(color_position),
+        )?;
+
+        Ok(role)
+    }
+
+    fn assign_color(&self, context: Context, user: User, guild: Arc<RwLock<Guild>>, color: Colour) -> Result<(String, String)> {
+        let role = self.get_or_create_role(&context, color, &guild)?;
+        let mut member = guild.read().member(&context, user.id)?;
+
+        println!("Adding role {} for {}", role.name, member.nick.clone().unwrap_or_default());
+
+        let old_colors: Vec<RoleId> = member.roles(context.cache.clone()).unwrap_or(vec![]).iter()
+            .filter(|r| self.color_regex.is_match(&r.name))
+            .map(|r| r.id)
+            .collect();
+        member.remove_roles(context.http.clone(), &old_colors)?;
+        member.add_role(context.http.clone(), role.id)?;
+        self.cleanup_roles(context, &guild, role.id)?;
+        Ok((role.name, user.name))
+    }
+
+    fn cleanup_roles(&self, context: Context, guild: &RwLock<Guild>, used: RoleId) -> Result<()> {
+        let used_roles: Vec<RoleId> = guild.read().members.values()
+            .flat_map(|member| member.roles.iter())
+            .map(|role| role.clone())
+            .collect();
+
+        let empty_roles: Vec<Role> = guild.read().roles
+            .values()
+            .filter(|role| self.color_regex.is_match(&role.name))
+            .filter(|role| !used_roles.contains(&role.id))
+            .filter(|role| role.id != used)
+            .map(|role| role.clone())
+            .collect();
+
+        let guild = guild.write();
+        for empty_role in empty_roles {
+            guild.delete_role(context.http.clone(), empty_role.id)?;
+        }
+        Ok(())
+    }
+}
+
+impl EventHandler for Handler {
+    // Set a handler for the `message` event - so that whenever a new message
+    // is received - the closure (or function) passed will be called.
+    //
+    // Event handlers are dispatched through a threadpool, and so multiple
+    // events can be dispatched simultaneously.
+    fn message(&self, context: Context, msg: Message) {
+        if let Some(color) = self.parse_color(&msg.content) {
+            if let Some(guild) = msg.guild(context.cache.clone()) {
+                match self.assign_color(context, msg.author, guild, color) {
+                    Ok((role, user)) => {
+                        println!("Assigned role {} for {}", role, user);
+                    }
+                    Err(err) => {
+                        println!("Error assigning color: {}", err);
+                    }
+                }
+            } else {
+                println!("Failed to get guild");
+            }
+        }
+    }
+
+    // Set a handler to be called on the `ready` event. This is called when a
+    // shard is booted, and a READY payload is sent by Discord. This payload
+    // contains data like the current user's guild Ids, current user data,
+    // private channels, and more.
+    //
+    // In this case, just print what the current user's username is.
+    fn ready(&self, _: Context, ready: Ready) {
+        println!("{} is connected!", ready.user.name);
+    }
+}
+
+fn main() {
+    env_logger::init().expect("Unable to init env_logger");
+
+    // Configure the client with your Discord bot token in the environment.
+    let token = env::var("DISCORD_TOKEN")
+        .expect("Expected a token in the environment");
+
+    // Create a new instance of the Client, logging in as a bot. This will
+    // automatically prepend your bot token with "Bot ", which is a requirement
+    // by Discord for bot users.
+    let mut client = Client::new(&token, Handler::new()).expect("Err creating client");
+
+    // Finally, start a single shard, and start listening to events.
+    //
+    // Shards will automatically attempt to reconnect, and will perform
+    // exponential backoff until it reconnects.
+    if let Err(why) = client.start() {
+        println!("Client error: {:?}", why);
+    }
+}