feat: Proper error handling

- Bump version to 0.8.0
- Added discord error struct
- All errors now implement std::error::Error
- Implemented error handler instead of relying on default
- Fixed bug where you could send answer on a completed quest

discord/src/commands/answer.rs

@@ -21,11 +21,15 @@ pub async fn answer(
     #[description = "Attachment answer to the quest"]
     file3: Option<Attachment>,
 ) -> Result<(), Error> {
+    let mut account = fetch_or_init_account(&ctx.data().config, ctx.author().id.to_string());
+
+    if let Some(_) = account.quests_completed.iter().find(|qid| **qid == quest_id) {
+        return Err(Error::QuestIsCompleted(quest_id));
+    }
+
     let quests = ctx.data().config.load_quests();
     let Some(quest) = quests.iter().find(|q| q.id == quest_id) else {
-        let reply_string = format!("Quest #{quest_id} not found.");
-        ctx.reply(reply_string).await?;
-        return Ok(());
+        return Err(Error::QuestNotFound(quest_id));
     };
     
     let mut files: Vec<Attachment> = Vec::new();
@@ -36,9 +40,7 @@ pub async fn answer(
     }
 
     if text.is_none() && files.len() == 0 {
-        let reply_string = "Please specify text or at least one attachment.".to_string();
-        ctx.reply(reply_string).await?;
-        return Ok(());
+        return Err(Error::NoContent);
     }
 
     let text_ans = match text {
@@ -90,7 +92,7 @@ pub async fn answer(
     let reply_string = "Your answer has been posted.".to_string();
     ctx.reply(reply_string).await?;
 
-    while let Some(press) = ComponentInteractionCollector::new(ctx)
+    if let Some(press) = ComponentInteractionCollector::new(ctx)
         .filter(move |press| press.data.custom_id.starts_with(&ctx_id.to_string()))
         .await
     {
@@ -108,7 +110,6 @@ pub async fn answer(
         let content: String;
         if is_approved {
             let mut no_errors = true;
-            let mut account = fetch_or_init_account(&ctx.data().config, ctx.author().id.to_string());
             if let Err(error) = quest.complete_for_account(&mut account) {
                 eprintln!("{error}");
                 no_errors = false;
@@ -137,9 +138,6 @@ pub async fn answer(
         };
         let dm_builder = CreateMessage::new().content(content);
         ctx.author().dm(ctx, dm_builder).await?;
-
-
-        return Ok(());
     }
 
     Ok(())