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traQ上のメッセージの投稿・編集日時に年月日を適宜省略しつつ付け足す #4338

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Jul 22, 2024
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traQ上のメッセージの投稿・編集日時に年月日を適宜省略しつつ付け足す #4338

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c9ae32b
traQ上のメッセージの投稿・編集日時に年月日を適宜省略しつつ付け足す
kitsne241 Jul 1, 2024
8e949db
コードのミスを修正
kitsne241 Jul 1, 2024
6c40343
テストケースを新しい実装に対応させた
kitsne241 Jul 4, 2024
0fb8434
テストケースの日付設定のミスを修正
kitsne241 Jul 4, 2024
1704661
faketimersを用いてtestを書き直しました
kitsne241 Jul 4, 2024
a35b1b0
フォーマットしました
kitsne241 Jul 4, 2024
292f68a
常にupdatedAtを使用・yesterdayの再定義の解消
kitsne241 Jul 7, 2024
3480347
フォーマットの場合分けにgetFullDayStringを不使用
kitsne241 Jul 7, 2024
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27 changes: 22 additions & 5 deletions src/lib/basic/date.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -42,12 +42,29 @@ export const getDateRepresentationWithoutSameDate = (
}

export const getDisplayDate = (createdAt: string, updatedAt: string) => {
const createdDate = new Date(createdAt)
if (createdAt === updatedAt) {
return getTimeString(createdDate)
const displayDate = new Date(updatedAt)
const today = new Date()
const timeString = getTimeString(displayDate)
const yesterday = new Date(today.getTime() - 1000 * 60 * 60 * 24)

if (
displayDate.getFullYear() === today.getFullYear() &&
displayDate.getMonth() === today.getMonth() &&
displayDate.getDate() === today.getDate()
) {
return '今日' + ' ' + timeString
}
if (
displayDate.getFullYear() === yesterday.getFullYear() &&
displayDate.getMonth() === yesterday.getMonth() &&
displayDate.getDate() === yesterday.getDate()
) {
return '昨日' + ' ' + timeString
}
if (displayDate.getFullYear() === today.getFullYear()) {
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ここから上は年が同じである条件はおなじなのでネストは増えるけど条件をまとめられそうです

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文意をうまく汲み取れていないかもですが、こういうことですか…？

if (
  displayDate.getFullYear() === yesterday.getFullYear() &&
  displayDate.getMonth() === yesterday.getMonth() &&
  displayDate.getDate() === yesterday.getDate()
) {
  return '昨日' + ' ' + timeString
}
if (displayDate.getFullYear() === today.getFullYear()) {
  if (
    displayDate.getMonth() === today.getMonth() &&
    displayDate.getDate() === today.getDate()
  ) {
    return '今日' + ' ' + timeString
  }
  return getDayString(displayDate) + ' ' + timeString
}
return getFullDayString(displayDate) + ' ' + timeString

大晦日のメッセージを元日に閲覧する時には『20XX/12/31』ではなく『昨日』と表示されてほしいので、年が同じである条件をまとめるならばそれより先に『昨日』の判定を書くことになります。

しかし個人的には、メッセージの投稿日時が
『今日』かどうか →『昨日』かどうか →『今年』かどうか
と順に遡りつつ判定していく構造を保った方が整理された実装に見えるような気がします…。どうでしょうか？

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↑のコードの想定でした
todayとyesterday混同しててもう少し単純なコードになると勘違いしてました🙏

それを踏まえても個人的にはtodayの比較とyesterdayの比較が交互に来るよりもyesterdayの比較→todayの比較の順に比較できる↑の実装が見やすいと感じますが、さっきの文字列で比較しないで欲しいという指摘ほど強い思いはないので任せます

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や、共通化のことだけを考えてたんですが拡張性が低くなるのでやっぱり現在に近い順に記述するままでいいです🙇🙇🙇

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了解です。レビューありがとうございます！

return getDayString(displayDate) + ' ' + timeString
} else {
const updatedDate = new Date(updatedAt)
return getDateRepresentationWithoutSameDate(updatedDate, createdDate)
return getFullDayString(displayDate) + ' ' + timeString
}
}

Expand Down
35 changes: 25 additions & 10 deletions tests/unit/lib/basic/date.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -94,18 +94,33 @@ describe('getDateRepresentationWithoutSameDate', () => {
})

describe('getDisplayDate', () => {
const dateISO = '2001-04-04T05:20:34'

it('should get time string when not modified', () => {
expect(getDisplayDate(dateISO, dateISO)).toBe('05:20')
beforeEach(() => {
vi.useFakeTimers()
})
it('should get time string when same date', () => {
const dateISO2 = '2001-04-04T08:25:34'
expect(getDisplayDate(dateISO, dateISO2)).toBe('08:25')
afterEach(() => {
vi.useRealTimers()
})
it('should get date string when not same date', () => {
const dateISO2 = '2001-06-04T08:25:34'
expect(getDisplayDate(dateISO, dateISO2)).toBe('06/04 08:25')

const createdDateISO = '2010-04-01T12:34:56'
const updatedDateISO = '2010-05-02T14:28:57'

it('should say 今日 when updated today', () => {
vi.setSystemTime('2010-05-02T15:00:00')
expect(getDisplayDate(createdDateISO, updatedDateISO)).toBe('今日 14:28')
})
it('should say 昨日 when updated yesterday', () => {
vi.setSystemTime('2010-05-03T15:00:00')
expect(getDisplayDate(createdDateISO, updatedDateISO)).toBe('昨日 14:28')
})
it('should get MM/DD when updated in the same year', () => {
vi.setSystemTime('2010-07-07T15:00:00')
expect(getDisplayDate(createdDateISO, updatedDateISO)).toBe('05/02 14:28')
})
it('should get YYYY/MM/DD when updated before last year', () => {
vi.setSystemTime('2015-10-10T15:00:00')
expect(getDisplayDate(createdDateISO, updatedDateISO)).toBe(
'2010/05/02 14:28'
)
})
})

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