CommandsKeyboard improvements (#302)

- add `commands` button to `/start` message
- disable `/commands` in groups and channels

src/bot/commands.rs

@@ -557,10 +557,20 @@ impl CommandProcessor {
 
     fn process_regular_command(&self) {
         match BotCommand::from_str(&self.text).unwrap() {
-            BotCommand::CommandsKeyboard => CommandsKeyboard::builder()
-                .message(self.message.clone())
-                .build()
-                .run(),
+            BotCommand::CommandsKeyboard => {
+                if let ChatType::Private = self.message.chat.type_field {
+                    CommandsKeyboard::builder()
+                        .message(self.message.clone())
+                        .build()
+                        .run()
+                } else {
+                    UnknownCommand::builder()
+                        .message(self.message.clone())
+                        .args("/commands".to_string())
+                        .build()
+                        .run()
+                }
+            }
 
             BotCommand::Subscribe(args) => Subscribe::builder()
                 .message(self.message.clone())

src/bot/commands/start.rs

@@ -1,6 +1,12 @@
 use super::Command;
+use super::CommandsKeyboard;
 use super::Message;
 use super::Response;
+use frankenstein::ChatType;
+use frankenstein::InlineKeyboardButton;
+use frankenstein::InlineKeyboardMarkup;
+use frankenstein::ReplyMarkup;
+use frankenstein::SendMessageParams;
 use typed_builder::TypedBuilder;
 
 static START: &str =
@@ -33,6 +39,34 @@ impl Start {
 
 impl Command for Start {
     fn response(&self) -> Response {
-        Response::Simple(START.to_string())
+        let response = START.to_string();
+
+        if let ChatType::Private = self.message.chat.type_field {
+            let mut buttons: Vec<Vec<InlineKeyboardButton>> = Vec::new();
+            let mut row: Vec<InlineKeyboardButton> = Vec::new();
+
+            let button = InlineKeyboardButton::builder()
+                .text("Commands")
+                .callback_data(CommandsKeyboard::command())
+                .build();
+
+            row.push(button);
+            buttons.push(row);
+
+            let keyboard = InlineKeyboardMarkup::builder()
+                .inline_keyboard(buttons)
+                .build();
+
+            let params = SendMessageParams::builder()
+                .chat_id(self.message.chat.id)
+                .disable_web_page_preview(true)
+                .text(response)
+                .reply_markup(ReplyMarkup::InlineKeyboardMarkup(keyboard))
+                .build();
+
+            Response::Params(params)
+        } else {
+            Response::Simple(START.to_string())
+        }
     }
 }