feat: support compact command across IM channels

src/channels/shared/compact-command.mjs

@@ -0,0 +1,95 @@
+import { WORKSPACE_SESSION_STALE } from './workspace-session.mjs';
+
+const COMPACT_COMMAND = /^\/compact(?=$|\s)([\s\S]*)$/i;
+const COMPACT_USAGE = '用法：/compact（不带参数）';
+
+const COMPACT_RESULT_TEXT = new Map([
+  ['No compactable history yet.', '暂无可压缩的历史记录。'],
+  [
+    'Compaction is unavailable because this process has an active compaction, or the agent is not idle.',
+    '当前会话正在生成回复或执行压缩，请稍后重试。',
+  ],
+  ['Compaction cancelled.', '上下文压缩已取消。'],
+  [
+    'The history selected for compaction changed before it could be replaced. The conversation is unchanged; the attempt is recorded in the session log.',
+    '压缩期间会话历史发生变化，本次未修改会话，请重试。',
+  ],
+  [
+    'Compaction could not produce a useful summary. The conversation is unchanged; the attempt is recorded in the session log.',
+    '未能生成有效的压缩摘要，本次未修改会话。',
+  ],
+  [
+    'Compaction did not finish cleanly; some session history may have changed. Inspect the current session state before retrying.',
+    '上下文压缩未正常完成，部分会话历史可能已变化，请检查会话后再重试。',
+  ],
+  [
+    'Compaction finished, but the session could not be saved.',
+    '上下文已压缩，但会话保存失败。',
+  ],
+]);
+
+function commandResult(message) {
+  return { handled: true, message, messages: [message] };
+}
+
+function compactResultText(result) {
+  if (!result || typeof result !== 'object'
+    || !['success', 'error'].includes(result.kind)
+    || (result.text !== undefined && typeof result.text !== 'string')) {
+    throw new TypeError('Harness returned an invalid /compact result');
+  }
+  const text = result.text?.trim() ?? '';
+  const compacted = /^Compacted (\d+) history items \(~(\d+) tokens\)\.$/u.exec(text);
+  if (compacted) {
+    return `已压缩 ${compacted[1]} 条历史记录（约 ${compacted[2]} 个 token）。`;
+  }
+  if (COMPACT_RESULT_TEXT.has(text)) return COMPACT_RESULT_TEXT.get(text);
+  if (text) return text;
+  return result.kind === 'success' ? '上下文压缩完成。' : '上下文压缩失败。';
+}
+
+function compactErrorMessage(error) {
+  const code = error?.code ?? error?.failure?.code;
+  if (code === 'session-not-found') {
+    return '当前聊天绑定的会话已不存在，请发送新消息开启会话。';
+  }
+  if (code === 'agent-busy') return '当前会话正在生成回复，请稍后重试。';
+  if (code === 'cancelled' || error?.name === 'AbortError') return '上下文压缩已取消。';
+  if (code === WORKSPACE_SESSION_STALE || code === 'workspace-bot-not-found') {
+    return '工作区或机器人状态已发生变化，请重试。';
+  }
+  if (code === 'commands-unavailable') {
+    return '当前 Harness 暂不支持从机器人执行上下文压缩。';
+  }
+  return '上下文压缩失败，请稍后重试。';
+}
+
+/**
+ * Execute the explicit Harness compaction command for an existing IM conversation Session.
+ * Unknown input returns null so the caller may continue ordinary message routing.
+ */
+export async function runCompactCommand(text, harness, state, conversationKey, options = {}) {
+  if (typeof text !== 'string') return null;
+  const match = COMPACT_COMMAND.exec(text.trim());
+  if (!match) return null;
+  if (match[1].trim()) return commandResult(COMPACT_USAGE);
+  if (typeof state?.sessionFor !== 'function') {
+    return commandResult('当前机器人没有可用的会话状态。');
+  }
+  const sessionId = state.sessionFor(conversationKey);
+  if (typeof sessionId !== 'string' || !sessionId) {
+    return commandResult('当前聊天还没有可压缩的会话，请先发送一条消息。');
+  }
+  if (typeof harness?.executeCommand !== 'function') {
+    return commandResult('当前机器人暂不支持上下文压缩。');
+  }
+  try {
+    const execution = await harness.executeCommand(sessionId, '/compact', options);
+    if (execution === undefined) {
+      return commandResult('当前 Harness 未注册 /compact 命令，请确认上下文压缩组件已启用。');
+    }
+    return commandResult(compactResultText(execution?.result));
+  } catch (error) {
+    return commandResult(compactErrorMessage(error));
+  }
+}