Skip to content

feat(twitch): truncate messages to 500-char limit instead of splitting #118

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
PyRo1121 wants to merge 1 commit into
base: main
Choose a base branch
from
Open

feat(twitch): truncate messages to 500-char limit instead of splitting #118

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
107 changes: 41 additions & 66 deletions src/messaging/twitch.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -220,53 +220,46 @@ impl Messaging for TwitchAdapter {

match response {
OutboundResponse::Text(text) => {
for chunk in split_message(&text, MAX_MESSAGE_LENGTH) {
client
.say(channel.to_owned(), chunk)
.await
.context("failed to send twitch message")?;
}
client
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to send twitch message")?;
}
OutboundResponse::RichMessage { text, .. } => {
for chunk in split_message(&text, MAX_MESSAGE_LENGTH) {
client
.say(channel.to_owned(), chunk)
.await
.context("failed to send twitch message")?;
}
client
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to send twitch message")?;
}
OutboundResponse::ThreadReply { text, .. } => {
// Twitch has no threads — reply to the source message instead
let truncated = truncate_message(&text, MAX_MESSAGE_LENGTH);
let reply_to_id = message
.metadata
.get("twitch_message_id")
.and_then(|v| v.as_str());

for chunk in split_message(&text, MAX_MESSAGE_LENGTH) {
if let Some(parent_id) = reply_to_id {
let reply_ref = (channel, parent_id);
client
.say_in_reply_to(&reply_ref, chunk)
.await
.context("failed to send twitch reply")?;
} else {
client
.say(channel.to_owned(), chunk)
.await
.context("failed to send twitch message")?;
}
if let Some(parent_id) = reply_to_id {
let reply_ref = (channel, parent_id);
client
.say_in_reply_to(&reply_ref, truncated)
.await
.context("failed to send twitch reply")?;
} else {
client
.say(channel.to_owned(), truncated)
.await
.context("failed to send twitch message")?;
}
}
OutboundResponse::File {
filename, caption, ..
} => {
// Twitch is text-only — send a note about the file
let text = match caption {
Some(caption) => format!("[File: {filename}] {caption}"),
None => format!("[File: {filename}]"),
};
client
.say(channel.to_owned(), text)
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to send twitch file notice")?;
}
Expand All @@ -283,16 +276,14 @@ impl Messaging for TwitchAdapter {
| OutboundResponse::RemoveReaction(_)
| OutboundResponse::Status(_) => {}
OutboundResponse::Ephemeral { text, .. } => {
// No ephemeral concept in Twitch — send as regular chat message
client
.say(channel.to_owned(), text)
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to send ephemeral fallback on twitch")?;
}
OutboundResponse::ScheduledMessage { text, .. } => {
// No scheduled messages on Twitch — send immediately
client
.say(channel.to_owned(), text)
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to send scheduled message fallback on twitch")?;
}
Expand All @@ -309,20 +300,16 @@ impl Messaging for TwitchAdapter {

if let OutboundResponse::Text(text) = response {
let channel = target.strip_prefix('#').unwrap_or(target);
for chunk in split_message(&text, MAX_MESSAGE_LENGTH) {
client
.say(channel.to_owned(), chunk)
.await
.context("failed to broadcast twitch message")?;
}
client
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to broadcast twitch message")?;
} else if let OutboundResponse::RichMessage { text, .. } = response {
let channel = target.strip_prefix('#').unwrap_or(target);
for chunk in split_message(&text, MAX_MESSAGE_LENGTH) {
client
.say(channel.to_owned(), chunk)
.await
.context("failed to broadcast twitch message")?;
}
client
.say(channel.to_owned(), truncate_message(&text, MAX_MESSAGE_LENGTH))
.await
.context("failed to broadcast twitch message")?;
}

Ok(())
Expand Down Expand Up @@ -350,30 +337,18 @@ impl Messaging for TwitchAdapter {
}
}

/// Split a message into chunks that fit within Twitch's character limit.
/// Tries to split at newlines, then spaces, then hard-cuts.
fn split_message(text: &str, max_len: usize) -> Vec<String> {
/// Truncate a message to fit within Twitch's single-message character limit.
/// Cuts at the last word boundary before the limit and appends "…" when truncated.
fn truncate_message(text: &str, max_len: usize) -> String {
if text.len() <= max_len {
return vec![text.to_string()];
return text.to_string();
}
let budget = max_len.saturating_sub("…".len());
let candidate = &text[..text.floor_char_boundary(budget)];

let mut chunks = Vec::new();
let mut remaining = text;

while !remaining.is_empty() {
if remaining.len() <= max_len {
chunks.push(remaining.to_string());
break;
}

let split_at = remaining[..max_len]
.rfind('\n')
.or_else(|| remaining[..max_len].rfind(' '))
.unwrap_or(max_len);

chunks.push(remaining[..split_at].to_string());
remaining = remaining[split_at..].trim_start();
}
let cut = candidate
.rfind(|c: char| c.is_whitespace())
.unwrap_or(candidate.len());

chunks
format!("{}…", candidate[..cut].trim_end())
}