Add initial version of Latin locale

src/locale/la.js

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+// Latin [la]
+import dayjs from 'dayjs'
+
+const monthFormat = 'ianuarii_februarii_martii_aprilis_maii_iunii_iulii_augusti_septembris_octobris_novembris_decembris'.split('_')
+const monthStandalone = 'ianuarius_februarius_martius_aprilis_maius_iunius_iulius_augustus_september_october_november_december'.split('_')
+const MONTHS_IN_FORMAT = /D[oD.ᵒ]?(\[[^[\]]*\]|\s)+MMMM?|MMMM?(\[[^[\]]*\]|\s)+D[oD.ᵒ]?/
+const months = (dayjsInstance, format) => {
+  if (MONTHS_IN_FORMAT.test(format)) {
+    return monthFormat[dayjsInstance.month()]
+  }
+  return monthStandalone[dayjsInstance.month()]
+}
+months.s = monthStandalone
+months.f = monthFormat
+
+// src: https://stackoverflow.com/a/9083076
+function romanise(num) {
+  const key = [
+    '', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM',
+    '', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC',
+    '', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'
+  ]
+  const digits = String(+num).split('')
+  let roman = ''
+  let i = 3
+  while (i > 0) {
+    i -= 1
+    roman = (key[+digits.pop() + (i * 10)] || '') + roman
+  }
+  return Array(+digits.join('') + 1).join('M') + roman
+}
+
+const locale = {
+  name: 'la',
+  weekdays: 'dominica_feria secunda_feria tertia_feria quarta_feria quinta_feria sexta_sabbato'.split('_'),
+  weekdaysShort: 'dominica_feria II_feria III_feria IV_feria V_feria VI_sabbato'.split('_'),
+  weekdaysMin: 'dom._II_III_IV_V_VI_sab.'.split('_'),
+  months,
+  monthsShort: 'ian._feb._mar._apr._mai._iun._iul._aug._sep._oct._nov._dec.'.split('_'),
+  weekStart: 0,
+  yearStart: 4,
+  ordinal: n => romanise(n),
+  // The relative time variables are in nominative case only
+  relativeTime: {
+    future: 'ad %s',
+    past: 'abhinc %s',
+    s: 'paucæ secundæ',
+    m: 'minuta',
+    mm: '%d minutæ',
+    h: 'hora',
+    hh: '%d horæ',
+    d: 'dies',
+    dd: '%d dies',
+    M: 'mensis',
+    MM: '%d menses',
+    y: 'annus',
+    yy: '%d anni'
+  },
+  formats: {
+    LT: 'HH:mm',
+    LTS: 'HH:mm:ss',
+    L: 'D. MM. YYYY',
+    LL: 'D MMMM YYYY',
+    LLL: 'D MMMM YYYY, HH:mm',
+    LLLL: 'dddd, D MMMM YYYY, HH:mm'
+  }
+}
+
+dayjs.locale(locale, null, true)
+
+export default locale

test/locale/la.test.js

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+import MockDate from 'mockdate'
+import dayjs from '../../src'
+import advancedFormat from '../../src/plugin/advancedFormat'
+import localizedFormat from '../../src/plugin/localizedFormat'
+import relativeTime from '../../src/plugin/relativeTime'
+import '../../src/locale/la'
+
+dayjs.extend(advancedFormat)
+dayjs.extend(localizedFormat)
+dayjs.extend(relativeTime)
+dayjs.locale('la')
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+describe('Latin: Test output of month names:', () => {
+  const T = [
+    [1, 'ianuarius', 'ianuarii', 'ian.'],
+    [2, 'februarius', 'februarii', 'feb.'],
+    [3, 'martius', 'martii', 'mar.'],
+    [4, 'aprilis', 'aprilis', 'apr.'],
+    [5, 'maius', 'maii', 'mai.'],
+    [6, 'iunius', 'iunii', 'iun.'],
+    [7, 'iulius', 'iulii', 'iul.'],
+    [8, 'augustus', 'augusti', 'aug.'],
+    [9, 'september', 'septembris', 'sep.'],
+    [10, 'october', 'octobris', 'oct.'],
+    [11, 'november', 'novembris', 'nov.'],
+    [12, 'december', 'decembris', 'dec.']
+  ]
+
+  it('in genitive case if day of month is output', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(['2020-', t[0], '-01'].join('')).locale('la').format('D MMMM')
+      const expected = ['1 ', t[2]].join('')
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+
+  it('in nominative if day of month is not output', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(['2020-', t[0], '-01'].join('')).locale('la').format('MMMM')
+      const expected = t[1]
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+
+  it('also as a shortcut', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(['2020-', t[0], '-01'].join('')).locale('la').format('MMM')
+      const expected = t[3]
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+})
+
+it('Latin: Test relative time', () => {
+  const T = [
+    [44.4, 'second', 'paucæ secundæ'], // a few seconds
+    [89.5, 'second', 'minuta'], // a minute
+    [2, 'minute', '2 minutæ'], // 2 minutes
+    [43, 'minute', '43 minutæ'], // 43 minutes
+    [45, 'minute', 'hora'], // an hour
+    [3, 'hour', '3 horæ'], // 3 hours
+    [21, 'hour', '21 horæ'], // 21 hours
+    [1, 'day', 'dies'], // a day
+    [3, 'day', '3 dies'], // 3 day
+    [25, 'day', '25 dies'], // 25 days
+    [1, 'month', 'mensis'], // a month
+    [2, 'month', '2 menses'], // 2 month
+    [10, 'month', '10 menses'], // 10 month
+    [1, 'year', 'annus'], // a year
+    [2, 'year', '2 anni'], // 2 year
+    [5, 'year', '5 anni'], // 5 year
+    [18, 'month', '2 anni'] // 2 years
+  ]
+
+  T.forEach((t) => {
+    // dayjs.locale('la')
+    const dayjsDay = dayjs()
+    const dayjsCompare = dayjs().add(t[0], t[1])
+    const expectedFrom = ['abhinc ', t[2]].join('')
+    const expectedTo = ['ad ', t[2]].join('')
+    const expectedFromTrue = t[2]
+
+    expect(dayjsDay.from(dayjsCompare)).toBe(expectedFrom)
+    expect(dayjsDay.to(dayjsCompare)).toBe(expectedTo)
+    expect(dayjsDay.from(dayjsCompare, true)).toBe(expectedFromTrue)
+  })
+})
+
+it('Latin: Test ordinal numbers in day of months', () => {
+  const T = [
+    [1, 'I'],
+    [2, 'II'],
+    [3, 'III'],
+    [4, 'IV'],
+    [5, 'V'],
+    [6, 'VI'],
+    [7, 'VII'],
+    [8, 'VIII'],
+    [9, 'IX'],
+    [10, 'X'],
+    [20, 'XX'],
+    [30, 'XXX'],
+    [31, 'XXXI']
+  ]
+
+  T.forEach((t) => {
+    const dayjsDay = dayjs(['2020-01-', t[0]].join('')).locale('la').format('Do')
+    const expected = t[1]
+    expect(dayjsDay).toBe(expected)
+  })
+})
+
+describe('Latin: Test weeday names:', () => {
+  const T = [
+    ['2020-01-05', 'dominica', 'dominica', 'dom.'],
+    ['2020-01-06', 'feria secunda', 'feria II', 'II'],
+    ['2020-01-07', 'feria tertia', 'feria III', 'III'],
+    ['2020-01-01', 'feria quarta', 'feria IV', 'IV'],
+    ['2020-01-02', 'feria quinta', 'feria V', 'V'],
+    ['2020-01-03', 'feria sexta', 'feria VI', 'VI'],
+    ['2020-01-04', 'sabbato', 'sabbato', 'sab.']
+  ]
+
+  it('full weekday names', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(t[0]).format('dddd')
+      const expected = t[1]
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+
+  it('short weekday names', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(t[0]).format('ddd')
+      const expected = t[2]
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+
+  it('minimal weekday names', () => {
+    T.forEach((t) => {
+      const dayjsDay = dayjs(t[0]).format('dd')
+      const expected = t[3]
+      expect(dayjsDay).toBe(expected)
+    })
+  })
+})
+
+it('minimal weekday names', () => {
+  const T = [
+    ['LT', '15:15'],
+    ['LTS', '15:15:32'],
+    ['L', '1. 01. 2020'],
+    ['LL', '1 ianuarii 2020'],
+    ['LLL', '1 ianuarii 2020, 15:15'],
+    ['LLLL', 'feria quarta, 1 ianuarii 2020, 15:15']
+  ]
+
+  T.forEach((t) => {
+    const dayjsDay = dayjs('2020-01-01 15:15:32').format(t[0])
+    const expected = t[1]
+    expect(dayjsDay).toBe(expected)
+  })
+})