fix(export): resolve edits into the original row; mark media rows

m.replace events no longer appear as their own "* text" line — the original row gets m.new_content and an (edited) marker. Media rows carry a [Image]/[Video]/[Audio]/[File] prefix and the JSON export includes mediaUrl; the UI notes attachments aren't included. Unit-tested. Fixes #50 Fixes #81 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
2026-09-12 20:28:42 -04:00
parent 7e64ea398b
commit 9f8fae964d
3 changed files with 220 additions and 13 deletions
@@ -0,0 +1,76 @@
+// Pure helpers for ExportRoomHistory.tsx, kept SDK/DOM-free so they're easy to
+// unit test in isolation.
+
+export type RawExportRecord = {
+  eventId: string;
+  ts: number;
+  sender: string;
+  body: string;
+  msgtype: string;
+  // Set when this record IS an m.replace edit event, to the event id it targets.
+  editsEventId?: string;
+  // The m.new_content.body carried by an m.replace edit event.
+  newBody?: string;
+};
+
+export type ResolvedExportRecord = {
+  eventId: string;
+  ts: number;
+  sender: string;
+  body: string;
+  msgtype: string;
+  edited: boolean;
+};
+
+// Human-readable label for media msgtypes, used to prefix txt/html export rows
+// so a media message isn't indistinguishable from a plain-text one.
+export const MEDIA_TYPE_LABELS: Partial<Record<string, string>> = {
+  'm.image': 'Image',
+  'm.video': 'Video',
+  'm.audio': 'Audio',
+  'm.file': 'File',
+};
+
+/**
+ * Resolves m.replace (edit) events against the original message they target:
+ * the edit event is dropped from the output (it should not appear as its own
+ * row), and the original message's body is replaced with the edit's
+ * `m.new_content.body`, marked `edited: true`.
+ *
+ * Order-independent: edits may appear before or after their target in the
+ * input (e.g. across separate back-pagination batches).
+ */
+export function resolveMessageEdits(records: RawExportRecord[]): ResolvedExportRecord[] {
+  const edits = new Map<string, string>();
+  for (const record of records) {
+    if (record.editsEventId && record.newBody) {
+      edits.set(record.editsEventId, record.newBody);
+    }
+  }
+
+  const resolved: ResolvedExportRecord[] = [];
+  for (const record of records) {
+    // Edit events never become their own row.
+    if (record.editsEventId) continue;
+    const editedBody = edits.get(record.eventId);
+    resolved.push({
+      eventId: record.eventId,
+      ts: record.ts,
+      sender: record.sender,
+      body: editedBody ?? record.body,
+      msgtype: record.msgtype,
+      edited: editedBody !== undefined,
+    });
+  }
+  return resolved;
+}
+
+// Prefixes a media message's body with a "[Image]"-style marker for txt/html
+// export output, and appends an "(edited)" suffix when applicable. Plain-text
+// messages are returned unchanged (aside from the edited suffix).
+export function formatExportBody(record: ResolvedExportRecord): string {
+  const label = MEDIA_TYPE_LABELS[record.msgtype];
+  const mediaPrefix = label ? `[${label}] ` : '';
+  const editedSuffix = record.edited ? ' (edited)' : '';
+  return `${mediaPrefix}${record.body}${editedSuffix}`;
+}