Print available bots for telegram botfather

src/bot.rs

@@ -6,6 +6,9 @@ use diesel::Connection;
 use diesel::ExpressionMethods;
 use diesel::QueryDsl;
 use diesel::RunQueryDsl;
+use strum::Display;
+use strum::EnumIter;
+use strum::IntoEnumIterator;
 use teloxide::adaptors::Throttle;
 use teloxide::dispatching::dialogue;
 use teloxide::dispatching::dialogue::InMemStorage;
@@ -28,7 +31,7 @@ use crate::db::ChatInfo;
 use crate::db::DbChat;
 use crate::{schema, Database};
 
-#[derive(BotCommands, Clone)]
+#[derive(BotCommands, Clone, EnumIter, Display)]
 #[command(rename_rule = "lowercase")]
 pub enum Command {
 	#[command()]
@@ -37,6 +40,23 @@ pub enum Command {
 	RemindDaysAhead,
 }
 
+impl Command {
+	pub fn print_commands() {
+		for command in Command::iter() {
+			let description = match command {
+				Command::SetCalendar => {
+					"Specify an URL to an ical file from which this bot will poll for events"
+				}
+				Command::SetLocale => "Choose between the languages \"de\" and \"en\"",
+				Command::RemindDaysAhead => {
+					"Choose how many days ahead of the event you'd like to be reminded"
+				}
+			};
+			println!("{} - {}", command.to_string().to_lowercase(), description);
+		}
+	}
+}
+
 pub async fn spawn(bot: Throttle<Bot>, db: Database) {
 	Dispatcher::builder(bot, build_handler_chain())
 		.dependencies(deps![db, InMemStorage::<()>::new()])

src/main.rs

@@ -4,6 +4,7 @@ mod db;
 mod error;
 mod schema;
 
+use std::env::args;
 use std::time::Duration;
 use std::{env, fs::File, io::BufReader, sync::Arc};
 
@@ -27,6 +28,7 @@ use teloxide::types::ChatId;
 use teloxide::{adaptors::throttle::Limits, Bot};
 use tokio::time::sleep;
 
+use crate::bot::Command;
 use crate::db::DbChat;
 
 #[macro_use]
@@ -74,6 +76,12 @@ pub type Database = Arc<Mutex<SqliteConnection>>;
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() {
+	if let Some(arg1) = args().nth(1) {
+		if arg1 == "commands" {
+			Command::print_commands();
+			return;
+		}
+	}
 	pretty_env_logger::init();
 	let config = Config::load().unwrap();
 	info!("Connecting to database {}", config.data_path);