Add Telegram and Discord IM channels

src/channels/shared/editable-message-stream.mjs

@@ -0,0 +1,81 @@
+export function splitMessageText(value, limit) {
+  const text = typeof value === 'string' ? value.trim() : '';
+  if (!text) return [];
+  const chunks = [];
+  let remaining = text;
+  while (remaining.length > limit) {
+    let cut = remaining.lastIndexOf('\n', limit);
+    if (cut < Math.floor(limit * 0.55)) cut = remaining.lastIndexOf(' ', limit);
+    if (cut < Math.floor(limit * 0.55)) cut = limit;
+    chunks.push(remaining.slice(0, cut).trim());
+    remaining = remaining.slice(cut).trimStart();
+  }
+  if (remaining) chunks.push(remaining);
+  return chunks;
+}
+
+export function createEditableMessageStream({
+  initialText = '正在处理…',
+  limit,
+  updateIntervalMs = 800,
+  create,
+  edit,
+  sendRemainder,
+  logger = console,
+}) {
+  let messageId;
+  let pending = null;
+  let timer = null;
+  let inFlight = null;
+  let closed = false;
+  let lastSent = initialText;
+
+  const schedule = () => {
+    if (closed || timer !== null || inFlight || !pending) return;
+    timer = setTimeout(() => {
+      timer = null;
+      const text = pending;
+      pending = null;
+      const next = splitMessageText(text, limit)[0] ?? initialText;
+      inFlight = Promise.resolve(next === lastSent ? undefined : edit(messageId, next))
+        .then(() => { lastSent = next; })
+        .catch((error) => logger.warn?.('[dsh-im] streamed message update failed:', error))
+        .finally(() => {
+          inFlight = null;
+          schedule();
+        });
+    }, updateIntervalMs);
+    timer?.unref?.();
+  };
+
+  return {
+    async start() {
+      messageId = await create(initialText);
+      return this;
+    },
+    update(text) {
+      if (closed || typeof text !== 'string' || !text.trim()) return;
+      pending = text;
+      schedule();
+    },
+    async finish(text) {
+      if (closed) throw new Error('Message stream is already closed');
+      closed = true;
+      if (timer !== null) clearTimeout(timer);
+      timer = null;
+      pending = null;
+      await inFlight?.catch(() => undefined);
+      const chunks = splitMessageText(text, limit);
+      const first = chunks[0] ?? '处理完成。';
+      if (first !== lastSent) await edit(messageId, first);
+      lastSent = first;
+      for (const chunk of chunks.slice(1)) await sendRemainder(chunk);
+    },
+    cancel() {
+      closed = true;
+      pending = null;
+      if (timer !== null) clearTimeout(timer);
+      timer = null;
+    },
+  };
+}