added calendar service

src/utils/date/__tests__/getDayMonthFromText.test.ts

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+import { getDayMonthFromText } from "../getDayMonthFromText";
+
+describe("getDayMonthFromText", () => {
+  const cases = [
+    {
+      text:
+        "Попытка номер два.\n\nСегодня. Старт в 19:32 от ГПНТБ. 80км. Асфальт. Темп бодрый. Две остановки на поесть и передохнуть. Маршрут тот же. Автоматическая отмена поката при граде размером более 0.5см.\n\nhttps://map.vault48.org/04092023_razmyatsya_po_asfaltu",
+      created: new Date("2023-09-06T04:24:53.000Z"),
+      expected: [6, 8],
+    },
+  ];
+
+  it.each(cases)("$text", ({ text, created, expected }) => {
+    expect(getDayMonthFromText(text, created)).toEqual(expected);
+  });
+});

src/utils/date/getDateFromText.ts

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+import { getDayMonthFromText } from "./getDayMonthFromText";
+import { getTimeFromString } from "./getTimeFromString";
+
+export const getDateFromText = (
+  val: string,
+  createdAt: Date
+): Date | undefined => {
+  const text = val.toLowerCase();
+
+  const time = getTimeFromString(text);
+  if (!time) {
+    return;
+  }
+
+  const dayMonth = getDayMonthFromText(text, createdAt);
+  if (!dayMonth) {
+    return;
+  }
+
+  const date = new Date(
+    createdAt.getFullYear(),
+    dayMonth[1],
+    dayMonth[0],
+    time[0],
+    time[1]
+  );
+
+  // TODO: handle jan and feb posts from december or november
+  // if createdAt is december and date is in January or February
+  // like this:
+  // if (isBefore(date, createdAt) && differenceInMonths(addYears(date, 1), createdAt) < 3) {
+  //   return addYears(date, 1) 
+  // }
+  // if (isBefore(date, createdAt)) {
+  //   const diff = differenceInMonths(date, createdAt);
+  //   return diff > 9 && dayMonth[1] >= 10
+  //     ? addYears(date, 1)
+  //     : undefined;
+  // }
+
+  return date;
+};

src/utils/date/getDayMonthFromText.ts

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+import { addDays } from "date-fns";
+
+const months = [
+  "янв",
+  "фев",
+  "мар",
+  "апр",
+  "мая",
+  "июн",
+  "июл",
+  "авг",
+  "сент",
+  "октя",
+  "нояб",
+];
+
+type DayMonth = [number, number];
+
+/** Searches for strings like 1 января */
+const byText = (val: string): DayMonth | undefined => {
+  const text = val.toLowerCase();
+  const match = text.match(
+    /(\d{1,2})\s?(янв|фев|мар|апр|мая|июн|июл|авг|сент|октя|нояб).*/
+  );
+
+  if (!match?.length) {
+    return;
+  }
+
+  const day = parseInt(match[1]);
+  const month = months.indexOf(match[2]);
+
+  if (
+    !Number.isFinite(day) ||
+    !Number.isFinite(month) ||
+    day < 0 ||
+    day > 31 ||
+    month < 0 ||
+    month >= months.length
+  ) {
+    return;
+  }
+
+  return [day, month];
+};
+
+const byNumber = (val: string): DayMonth | undefined => {
+  const text = val.toLowerCase();
+
+  const match = text.match(/\b([0-2]?[0-9]|31)\.([1]?[0-2]|0?[0-9])\b/);
+  if (!match?.length) {
+    return;
+  }
+
+  const day = parseInt(match[1]);
+  const month = parseInt(match[2]);
+  if (
+    !Number.isFinite(day) ||
+    !Number.isFinite(month) ||
+    day < 1 ||
+    day > 31 ||
+    month < 1 ||
+    month > 12
+  ) {
+    return;
+  }
+
+  return [day, month];
+};
+
+const byToday = (val: string, refDate: Date): DayMonth | undefined => {
+  const text = val.toLowerCase();
+  if (text.match(/сегодня/)) {
+    return [refDate.getDate(), refDate.getMonth()];
+  }
+
+  if (text.match(/завтра/)) {
+    const tomorrow = addDays(refDate, 1);
+    return [tomorrow.getDate(), tomorrow.getMonth()];
+  }
+
+  return;
+};
+export const getDayMonthFromText = (val: string, refDate: Date) =>
+  byText(val) || byNumber(val) || byToday(val, refDate);

src/utils/date/getTimeFromString.ts

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+export const getTimeFromString = (
+  val: string
+): [number, number] | undefined => {
+  const matches = val.match(/\b([01]?[0-9]|2[0-3])[:\-]([0-5][0-9])\b/);
+
+  if (!matches?.length) {
+    return;
+  }
+
+  const hours = parseInt(matches[1]);
+  const minutes = parseInt(matches[2]);
+
+  if (hours < 0 || hours > 24 || minutes < 0 || minutes > 60) {
+    return;
+  }
+
+  return [hours, minutes];
+};

src/utils/text/getSummaryFromText.ts

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+import { maybeTrim } from './maybeTrim';
+
+/** Makes summary from first 3 strings of text */
+export const getSummaryFromText = (text: string) => {
+  const match = text.match(/(.*\n?){0,3}/)
+
+  return match?.[0] ? maybeTrim(match[0].replace(/\n/gm, ''), 96) : '';
+}

src/utils/text/maybeTrim.ts

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+export const maybeTrim = (text: string, maxChars: number) => text.length > maxChars ? `${text.slice(0, maxChars)}...` : text;