Added discord bot functionality through serenity

src/lib.rs

@@ -8,7 +8,7 @@ use thiserror::Error;
 mod lib_test;
 
 #[derive(Debug, PartialEq, Clone)]
-enum DiceFilter {
+pub enum DiceFilter {
     DropLowest(usize),
     DropHighest(usize),
     KeepLowest(usize),
@@ -16,7 +16,7 @@ enum DiceFilter {
 }
 
 #[derive(Debug, PartialEq, Clone)]
-enum Segment {
+pub enum Segment {
     DiceRoll {
         op: char,
         count: i32,
@@ -166,10 +166,10 @@ fn group_modifiers_to_dicerolls(segments: &[Segment]) -> Vec<RollWithModifier> {
 }
 
 #[derive(Debug, PartialEq, Clone)]
-struct Roll {
-    operator: char,
-    results: Vec<i32>,
-    total: i32,
+pub struct Roll {
+    pub operator: char,
+    pub results: Vec<i32>,
+    pub total: i32,
 }
 
 #[derive(Error, Debug, PartialEq, Clone)]
@@ -265,12 +265,12 @@ fn roll_dice_segments<R: Rng>(
 }
 
 #[derive(Debug, PartialEq, Clone)]
-struct RollSet {
-    total: i32,
-    rolls: Vec<(Roll, Vec<Segment>)>,
+pub struct RollSet {
+    pub total: i32,
+    pub rolls: Vec<(Roll, Vec<Segment>)>,
 }
 
-fn roll_dice<R: Rng>(s: &str, mut rng: R) -> Result<RollSet> {
+pub fn roll_dice<R: Rng>(s: &str, mut rng: R) -> Result<RollSet> {
     let segments = parse_dice_segments(s)?;
 
     let groups = group_modifiers_to_dicerolls(&segments);

src/main.rs

@@ -1,3 +1,86 @@
-fn main() {
-    println!("Hello, world!");
+mod lib;
+use rand::thread_rng;
+use serenity::{
+    client::{Context, EventHandler},
+    framework::{
+        standard::{
+            macros::{command, group},
+            CommandResult,
+        },
+        StandardFramework,
+    },
+    model::{prelude::Ready, channel::Message},
+    Client,
+};
+
+#[group]
+#[commands(hi, roll)]
+struct General;
+
+#[command]
+fn hi(ctx: &mut Context, msg: &Message) -> CommandResult {
+    msg.reply(ctx, "Hello world!")?;
+
+    Ok(())
+}
+
+#[command]
+fn roll(ctx: &mut Context, msg: &Message) -> CommandResult {
+    let content = msg.content_safe(&ctx.cache);
+    let mut rng = thread_rng();
+
+    let roll_result = lib::roll_dice(&content, &mut rng)?;
+
+    let result : String = roll_result.rolls.iter().map(|i| {
+        let operator = &i.0.operator;
+        let rolls = &i.0.results;
+        let modifiers : String = i.1.iter().map(|seg| {
+            match seg {
+                lib::Segment::Modifier {op, amount} => format!("{}{}", op, amount),
+                _ => unreachable!()
+            }
+        })
+        .collect::<Vec<_>>().join("");
+        
+        format!("{}{:?} {}", operator, rolls, modifiers)
+        
+    }).collect::<Vec<_>>().join(" ");
+
+    let total = roll_result.total;
+
+    let result = format!("{}= {}", result, total);
+    
+    if let Err(e)  = msg.reply(ctx, result) {
+        eprintln!("Failed to respond to command: {:?}", e)
+    }
+    
+    Ok(())
+}
+
+struct Handler;
+
+impl EventHandler for Handler {
+
+    fn ready(&self, ctx: Context, _: Ready) {
+        use serenity::model::{gateway::Activity, user::OnlineStatus};
+
+	ctx.set_presence(Some(Activity::playing("with dice | /roll")), OnlineStatus::Online);
+    }
+    
+}
+
+fn main() {
+    let discord_token = std::env::var("DISCORD_TOKEN").expect("failed to read DISCORD_TOKEN environment variable");  
+
+    let mut client = Client::new(&discord_token, Handler).expect("Error creating client");
+
+    client.with_framework(
+        StandardFramework::new()
+            .configure(|c| c.prefix("/"))
+            .group(&GENERAL_GROUP),
+    );
+
+    if let Err(e) = client.start() {
+        eprintln!("Error occured starting discord client: {:?}", e);
+    }
 }