feat(conversation): replicate in-place user message editing (TODO 03)

src/main/workspace-revert.ts

@@ -2,6 +2,8 @@ import { promises as fs } from 'node:fs'
 import { dirname, isAbsolute, relative, resolve, sep, join } from 'node:path'
 import { randomUUID } from 'node:crypto'
 import type { RevertChange } from '@shared/revert'
+import { getRevertChanges } from '@shared/revert'
+import type { ChatMessage } from '@shared/types'
 
 async function replaceFile(path: string, content: string | null): Promise<void> {
   if (content === null) { await fs.unlink(path); return }
@@ -33,3 +35,14 @@ export async function restoreWorkspaceFiles(workspace: string, changes: RevertCh
   } catch (error) { await undo(); throw error }
   return undo
 }
+
+/**
+ * 编辑提交前的产物回退（原版 userMessage.edit.hint：产物回退至此消息前版本）。
+ * 返回撤销函数；该消息之后没有可回退的写入时返回 undefined。
+ * 记录不完整时由 getRevertChanges 抛错，调用方应中止提交而不是静默保留文件修改。
+ */
+export async function rollbackEditedArtifacts(workspace: string, messages: ChatMessage[], userMessageId: string): Promise<(() => Promise<void>) | undefined> {
+  const changes = getRevertChanges(messages, userMessageId)
+  if (!changes.length) return undefined
+  return restoreWorkspaceFiles(workspace, changes)
+}