38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
 
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import { EventTimelineSet, MatrixEvent } from 'matrix-js-sdk';
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import { getEventEdits, trimReplyFromBody } from './room';
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import { DiffToken, wordDiff } from './wordDiff';
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const isPlainText = (content: Record<string, unknown> | undefined): content is { body: string } =>
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!!content &&
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typeof content.body === 'string' &&
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content.format === undefined &&
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content.formatted_body === undefined;
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/**
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* [Gitea #144] Word diff of the *last* edit to `mEvent`: the newest edit's body
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* against the one it replaced (an earlier edit, or the original). Only for
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* plain-text bodies — formatted edits return `undefined` and the caller falls
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* back to the history viewer.
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*/
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export function getLastEditDiff(
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mEvent: MatrixEvent,
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timelineSet: EventTimelineSet,
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): DiffToken[] | undefined {
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const eventId = mEvent.getId();
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if (!eventId) return undefined;
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const relations = getEventEdits(timelineSet, eventId, mEvent.getType());
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if (!relations) return undefined;
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const edits = relations
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.getRelations()
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.filter((e) => e.getSender() === mEvent.getSender())
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.sort((m1, m2) => m2.getTs() - m1.getTs());
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const latest = edits[0];
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if (!latest) return undefined;
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const after = latest.getContent()['m.new_content'] as Record<string, unknown> | undefined;
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const before = (edits[1]?.getContent()['m.new_content'] ?? mEvent.getContent()) as
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| Record<string, unknown>
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| undefined;
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if (!isPlainText(after) || !isPlainText(before)) return undefined;
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return wordDiff(trimReplyFromBody(before.body), trimReplyFromBody(after.body));
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}
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