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packages/frontend/src/utility/timeline-date-separate.ts

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+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { computed } from 'vue';
+import type { Ref } from 'vue';
+
+function getDateText(dateInstance: Date) {
+	const date = dateInstance.getDate();
+	const month = dateInstance.getMonth() + 1;
+	return `${month.toString()}/${date.toString()}`;
+}
+
+export type DateSeparetedTimelineItem<T> = {
+	id: string;
+	type: 'item';
+	data: T;
+} | {
+	id: string;
+	type: 'date';
+	prev: Date;
+	prevText: string;
+	next: Date;
+	nextText: string;
+};
+
+export function makeDateSeparatedTimelineComputedRef<T extends { id: string; createdAt: string; }>(items: Ref<T[]>) {
+	return computed<DateSeparetedTimelineItem<T>[]>(() => {
+		const tl: DateSeparetedTimelineItem<T>[] = [];
+		for (let i = 0; i < items.value.length; i++) {
+			const item = items.value[i];
+
+			const date = new Date(item.createdAt);
+			const nextDate = items.value[i + 1] ? new Date(items.value[i + 1].createdAt) : null;
+
+			tl.push({
+				id: item.id,
+				type: 'item',
+				data: item,
+			});
+
+			if (
+				i !== items.value.length - 1 &&
+					nextDate != null && (
+					date.getFullYear() !== nextDate.getFullYear() ||
+						date.getMonth() !== nextDate.getMonth() ||
+						date.getDate() !== nextDate.getDate()
+				)
+			) {
+				tl.push({
+					id: `date-${item.id}`,
+					type: 'date',
+					prev: date,
+					prevText: getDateText(date),
+					next: nextDate,
+					nextText: getDateText(nextDate),
+				});
+			}
+		}
+		return tl;
+	});
+}