Added Chooser handler.

Signed-off-by: Pavel Kirilin <win10@list.ru>

src/bot/handlers/fun/chooser.rs

@@ -0,0 +1,34 @@
+use grammers_client::{Client, Update};
+use rand::seq::SliceRandom;
+
+use crate::{bot::handlers::Handler, utils::messages::get_message};
+
+#[derive(Clone)]
+pub struct Chooser;
+
+#[async_trait::async_trait]
+impl Handler for Chooser {
+    async fn react(&self, _: &Client, update: &Update) -> anyhow::Result<()> {
+        let Some(input_message) = get_message(update) else {
+            return Ok(());
+        };
+        let response = input_message
+            .text()
+            .strip_prefix(".c")
+            // Check if string is not empty.
+            .filter(|a| !a.is_empty())
+            // Split by commas.
+            .map(|text| text.trim().split(',').collect::<Vec<_>>())
+            // Choose random variant.
+            .and_then(|collected| collected.choose(&mut rand::rngs::OsRng).copied());
+        // It the string is chosen, reply to message with it.
+        if let Some(answer) = response {
+            input_message.reply(answer).await?;
+        } else {
+            input_message
+                .reply("Я не смог понять из чего мне выбирать. Попробуй ещё раз.")
+                .await?;
+        }
+        Ok(())
+    }
+}

src/bot/handlers/fun/mod.rs

@@ -1,4 +1,5 @@
 pub mod blyaficator;
+pub mod chooser;
 pub mod greeter;
 pub mod magic_ball;
 pub mod repeator;