holidayconifer.ts

holidayconifer.ts

import { Console } from "node:console";

const BALL = '⏺'
const COLOR = {
    'blue': '\\033[94m',
    'yellow': '\\033[93m',
    'cyan': '\\033[96m',
    'green': '\\033[92m',
    'magenta': '\\033[95m',
    'white': '\\033[97m',
    'red': '\\033[91m'
}
const STAR = '★'

const getRandomIndexes = (string: string, count: number) => {
  const indexes: Record<number, true> = {};

  let length = 0
  while (length < count) {
    const randomIndex = Math.floor(Math.random() * string.length);
    if (!indexes[randomIndex]) {
      indexes[randomIndex] = true;
    }
  }
  return Object.keys(indexes);
}

const randomChangeChar = (string, count) => {
    const indexes = getRandomIndexes(string, count)
    const arr = string.split('')
    for (const idx in indexes) {
      if (arr[idx] === '_') {
        arr[idx] = BALL
      }
    }
    return arr.join('')
}

const tree = (height: number = 13, screenWidth: number = 80) => {
    const star = [STAR, STAR, STAR, STAR] 
    if (height % 2 !== 0) {
        height += 1
    }
    const body = ['/_\\', '/_\_\\']
    const trunk = '[___]'
    const begin = '/'
    const end = '\\'
    const pattern = '_/'
    let j = 5
    for (let i = 7; i < height + 1; i += 2) {
        let middle = pattern
        for (let k = 0; k < i - j; k++) {
          middle += pattern
        }
        let line = [begin, middle.slice(-1), end].join('')
        body.push(line)
        middle = middle.replace('/', '\\')
        line = [begin, middle.slice(-1), end].join('')
        body.push(line)
        j += 1
    }

    const ret: string[] = []

    for (const line in [...star, ...body, trunk]) {
      // center the tree based on screen width
      const spaces = ' '.repeat((screenWidth - line.length) / 2)
      ret.push(spaces + line)
    }

    return ret
}

const balls = (tree: string[]) => {
    for (let idx = 0; idx < tree.length - 3; idx++) {
        tree[idx] = randomChangeChar(tree[idx], tree[idx].length)
    }
    return tree
}

const coloredStarsBalls = (tree: string[]) => {
    for (const idx in tree) {
        const string = tree[idx].split('')
        for (const pos in string) {
            if (string[pos] === STAR) {
                string[pos] = [COLOR['yellow'], STAR, '\\033[0m'].join('')
            }
            else if (string[pos] === BALL) {
                string[pos] = [Object.values(COLOR)[Math.random() * Object.values(COLOR).length], BALL, '\\033[0m'].join('')  
            }
        }
        tree[idx] = string.join('')
    }
    return tree
}

const cli = () => {
    const {columns, rows} = Deno.consoleSize(Deno.stdout.rid)
    const height = rows - 2
    const console = new Console(Deno.stdout)
    setInterval(() => {
      console.clear()
      console.log(coloredStarsBalls(balls(tree(height, columns))).join('\n'))
    }, 1000)
}