Created
August 6, 2021 14:51
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shiok shiok satay
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import { add, getDay, getMonth, getYear, isLastDayOfMonth, sub } from "date-fns"; | |
import { chunk } from "lodash"; | |
import { Dispatch, SetStateAction, useState } from "react"; | |
type CalendarView = "month"; | |
type UseCalendarOptions = { | |
view: CalendarView; | |
/** | |
* Indicates if the week should start on Monday instead of Sunday. Defaults to starting on Sunday. | |
* @default false | |
*/ | |
startWeekOnMonday?: boolean; | |
}; | |
type UseCalendarReturnValue = { | |
view: "month"; | |
days: number[]; | |
firstDateOfMonth: Date; | |
dates: Date[]; | |
datesByWeek: Date[][]; | |
date: Date; | |
setDate: Dispatch<SetStateAction<Date>>; | |
}; | |
export function useCalendar({ | |
view = "month", | |
startWeekOnMonday = false, | |
}: UseCalendarOptions): UseCalendarReturnValue { | |
const [date, setDate] = useState(new Date()); | |
const firstDateOfMonth = new Date(date); | |
firstDateOfMonth.setDate(1); | |
const dates: Date[] = [firstDateOfMonth]; | |
// Create array containing all the dates in the month. | |
while (!isLastDayOfMonth(dates[dates.length - 1])) { | |
const lastDateAdded = dates[dates.length - 1]; | |
dates.push(add(lastDateAdded, { days: 1 })); | |
} | |
// Then, pad the front to start the dates with sunday/monday depending on startWeekOnMonday. | |
while (getDay(dates[0]) !== (startWeekOnMonday ? 1 : 0)) { | |
const firstDateAdded = dates[0]; | |
dates.unshift(sub(firstDateAdded, { days: 1 })); | |
} | |
// Then, pad the end to make sure we have a total of 6 weeks in the array. | |
while (dates.length < 7 * 6) { | |
const lastDateAdded = dates[dates.length - 1]; | |
dates.push(add(lastDateAdded, { days: 1 })); | |
} | |
return { | |
view: "month", | |
date, | |
setDate, | |
days: startWeekOnMonday ? [1, 2, 3, 4, 5, 6, 0] : [0, 1, 2, 3, 4, 5, 6], | |
firstDateOfMonth, | |
dates, | |
datesByWeek: chunk(dates, 7), | |
}; | |
} |
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