git.r.bdr.sh - rbdr/corona-regeln/blob - lib/rule_generator.js

   1 const { readdir } = require('fs/promises');
   2 const { join, resolve } = require('path');
   3
   4 const internals = {
   5
   6   dates: [
   7     'today',
   8     'tomorrow',
   9     'next friday',
  10     'next wednesday',
  11     'last thursday',
  12     'last tuesday',
  13     'the next day divisible by 7',
  14     'this afternoon',
  15     'next fiscal quarter',
  16   ],
  17
  18   rules: null,
  19   currentIndex: 0,
  20
  21   kRulesDirectory: resolve(process.cwd(), 'rules'),
  22
  23   async readRules() {
  24
  25     const ruleFiles = await readdir(internals.kRulesDirectory);
  26     const rules = ruleFiles
  27       .filter((file) => file.match(/.js$/))
  28       .map((file) => require(join(internals.kRulesDirectory, file)));
  29
  30     internals.rules = rules.sort(() => Math.random() - 0.5)
  31   }
  32 }
  33
  34 module.exports = {
  35   async generate() {
  36
  37     if (!internals.rules) {
  38       await internals.readRules();
  39     }
  40
  41     const rule = internals.rules[internals.currentIndex];
  42     const time = internals.dates[Math.floor(Math.random() * internals.dates.length)];
  43     internals.currentIndex = (internals.currentIndex + 1) % internals.rules.length
  44     return {
  45       rule: rule(),
  46       time
  47     }
  48   }
  49 }