renovate/lib/config/migrations/custom/schedule-migration.ts

import later from '@breejs/later';
import { isArray, isString } from '@sindresorhus/is';
import { regEx } from '../../../util/regex.ts';
import { AbstractMigration } from '../base/abstract-migration.ts';

const shortHoursRegex = regEx(/(?<hours> \d?\d)(?<meridiem>(?:a|p)m)/g);
const afterBeforeRegex = regEx(
  /^(?<pre>.*?)(?<afterBefore1>after|before) (?<mid1>.*?) and (?<afterBefore2>after|before) (?<mid2>.*?)(?: |$)(?<rest>.*)/,
);
const dayRegex1 = regEx(/every (?:mon|tues|wednes|thurs|fri|satur|sun)day$/);
const dayRegex2 = regEx(/every (?<day>[a-z]*day)$/);
export class ScheduleMigration extends AbstractMigration {
  override readonly propertyName = 'schedule';

  override run(value: unknown): void {
    if (value) {
      // massage to array first
      let schedules: string[] = [];
      if (isString(value)) {
        schedules = [value];
      }
      if (isArray<string>(value)) {
        schedules = [...value];
      }
      // split 'and'
      const schedulesLength = schedules.length;
      for (let i = 0; i < schedulesLength; i += 1) {
        if (
          schedules[i].includes(' and ') &&
          schedules[i].includes('before ') &&
          schedules[i].includes('after ')
        ) {
          const parsedSchedule = later.parse.text(
            // We need to massage short hours first before we can parse it
            schedules[i].replace(shortHoursRegex, '$<hours>:00$<meridiem>'),
          ).schedules[0];
          // Only migrate if the after time is greater than before, e.g. "after 10pm and before 5am"
          if (!parsedSchedule?.t_a || !parsedSchedule.t_b) {
            continue;
          }

          if (parsedSchedule.t_a[0] > parsedSchedule.t_b[0]) {
            const toSplit = schedules[i];
            schedules[i] = toSplit
              .replace(
                afterBeforeRegex,
                '$<pre>$<afterBefore1> $<mid1> $<rest>',
              )
              .trim();
            schedules.push(
              toSplit
                .replace(
                  afterBeforeRegex,
                  '$<pre>$<afterBefore2> $<mid2> $<rest>',
                )
                .trim(),
            );
          }
        }
      }
      for (let i = 0; i < schedules.length; i += 1) {
        if (schedules[i].includes('on the last day of the month')) {
          schedules[i] = schedules[i].replace(
            'on the last day of the month',
            'on the first day of the month',
          );
        }
        if (schedules[i].includes('on every weekday')) {
          schedules[i] = schedules[i].replace(
            'on every weekday',
            'every weekday',
          );
        }
        if (schedules[i].endsWith(' every day')) {
          schedules[i] = schedules[i].replace(' every day', '');
        }
        if (dayRegex1.test(schedules[i])) {
          schedules[i] = schedules[i].replace(dayRegex2, 'on $<day>');
        }
        if (schedules[i].endsWith('days')) {
          schedules[i] = schedules[i].replace('days', 'day');
        }
      }
      if (isString(value) && schedules.length === 1) {
        this.rewrite(schedules[0]);
      } else {
        this.rewrite(schedules);
      }
    }
  }
}