Add challenge command

.env.example

@@ -1,2 +1,3 @@
 DISCORD_TOKEN=
-PREFIX="-h "
+PREFIX="-h "
+CHALLENGE_DIR=/path/to/challenge/content/folder

src/commands/challenge.rs

@@ -0,0 +1,25 @@
+use serenity::framework::standard::{macros::command, Args, CommandResult};
+use serenity::model::prelude::*;
+use serenity::prelude::*;
+
+use std::env;
+use std::fs;
+
+#[command]
+async fn challenge(ctx: &Context, msg: &Message) -> CommandResult {
+	println!("Command received");
+	let challenge_dir = env::var("CHALLENGE_DIR").unwrap();
+	let paths = fs::read_dir(challenge_dir).unwrap();
+	let challenge = {
+		let mut max = 0;
+		for path in paths {
+			let number = path.unwrap().path().file_stem().unwrap().to_str().unwrap().parse::<i32>().unwrap();
+			if number > max {
+				max = number;
+			}
+		}
+		max
+	};
+	msg.reply(&ctx.http, format!("Tegaki Tuesday #{n}: https://tegakituesday.com/{n}", n = challenge)).await?;
+	Ok(())
+}

src/commands/mod.rs

@@ -1,2 +1,3 @@
 pub mod kanji;
 pub mod owner;
+pub mod challenge;

src/main.rs

@@ -12,7 +12,7 @@ mod commands;
 
 use std::{collections::HashSet, env, sync::Arc};
 
-use commands::{kanji::*, owner::*};
+use commands::{kanji::*, owner::*, challenge::*};
 use serenity::{
     async_trait,
     client::bridge::gateway::ShardManager,
@@ -43,7 +43,7 @@ impl EventHandler for Handler {
 }
 
 #[group]
-#[commands(joyo, jinmeiyo, kyoiku, jlpt, hyogai, so, sleep)]
+#[commands(joyo, jinmeiyo, kyoiku, jlpt, hyogai, so, challenge, sleep)]
 struct General;
 
 #[tokio::main]