ji-chan/src/commands/meta.rs

use serenity::framework::standard::macros::hook;
use serenity::framework::standard::{macros::command, CommandResult};
use serenity::model::prelude::*;
use serenity::prelude::*;

use std::env;

#[command]
async fn help(ctx: &Context, msg: &Message) -> CommandResult {
    let prefix = env::var("PREFIX").unwrap();
    let message = format!(
"<:jichan:943336845637480478> Hello! I'm 字【じ】ちゃん (Ji-chan), the Tegaki Tuesday bot (and mascot!).
For more information about the challenge, check out the website at <https://tegakituesday.com>

__**Tegaki Tuesday 手書きの火曜日**__
:ballot_box: `{p}submit` Submit to the latest handwriting challenge.
:pencil: `{p}challenge` View the latest handwriting challenge info.
:frame_photo: `{p}images` List images in your current submission, if available.
:wastebasket: `{p}imageDelete <image number>` Delete images from your current submission using image numbers from -h images.
:bulb: `{p}suggest <suggestion>` Make a suggestion for future challenge prompts!

__**Kanji 漢字**__
:information_source: `{p}i <text>` Get category information and links to Jisho for character(s), along with with stroke a order diagram for single characters.
:paintbrush: `{p}so <text>` Get stroke order diagrams for character(s), maximum 4
:game_die: `{p}jinmeiyo` Random Jinmeiyō kanji
:game_die: `{p}joyo` Random Jōyō kanji
:game_die: `{p}kyoiku <grade|all>` Random Kyōiku kanji
:game_die: `{p}jlpt <level|all>` Random JLPT kanji
:game_die: `{p}hyogai <group|all>` Random Hyōgai kanji",
        p = prefix
    );
    msg.reply(&ctx.http, message).await?;
    Ok(())
}

#[hook]
pub async fn unrecognised_command_hook(
    ctx: &Context,
    msg: &Message,
    unrecognised_command_name: &str,
) {
    msg.reply(&ctx.http, &format!("I don't understand the command '{}'. For a list of commands, see `{}help`. Commands are case-sensitive.", unrecognised_command_name, env::var("PREFIX").unwrap())).await.unwrap();
}