binance-cli-watcher

binance-cli-watcher.ts

import { plot } from "https://deno.land/x/[email protected]/mod.ts";
import { parse } from "https://deno.land/[email protected]/flags/mod.ts";
import { sleep } from "https://deno.land/x/[email protected]/mod.ts";
import {
  blue,
  green,
  red,
  yellow,
} from "https://deno.land/[email protected]/fmt/colors.ts";
import { writeAll } from "https://deno.land/[email protected]/streams/conversion.ts";

function colorize(n: string, c = 0): string {
  return +n > c ? green(`${n}`) : +n < c ? red(`${n}`) : `${n}`;
}

const winSymbols = ["+", "+", "-", "-", "-", "\\", "/", "\\", "/", "|"];

function format(padding: string) {
  return (num: number) => (padding + num.toFixed(flags.p)).slice(-padding.length);
}

const flags = parse(Deno.args, {
  default: { t: 5, s: "XLMUSDT", p: 6 },
  alias: {
    "h": "help",
  },
});

if (flags.h) {
  console.log(`\
Usage: binance-cli-watcher [-tmxswhp]
  -h, --help
    this message
  -t
    update interval in seconds
    default: 5
  -m
    min value
  -x
    max value
  -s
    symbol
    default: XLMUSDT (to the moon!)
  -w
    windows-compatible characters - for use in cmd
powered by deno, deno.land/x/chart, and binance's api
  -p
    decimal precision
    default: 4
`);
  Deno.exit();
}

async function getData(s: string): Promise<number> {
  let tries = 10;
  let err: Error | undefined;
  while (tries-- > 0) {
    try {
      return fetch(`https://api.binance.com/api/v1/ticker/price?symbol=${s}`)
        .then((r) => r.json())
        .then((r) => +r.price);
    } catch (e) {
      err = e;
    }
    await sleep(1);
  }
  throw err;
}

const priceData: number[] = [];

async function print(txt: string) {
  await writeAll(Deno.stdout, new TextEncoder().encode(txt));
}

console.clear();
while (true) {
  const { rows, columns } = Deno.consoleSize(Deno.stdout.rid);
  const price = await getData(flags.s);
  const padding = price.toFixed(flags.p).replace(/./g, ' ');
  const [prevPrice] = priceData.slice(-1);
  priceData.push(price);
  while (priceData.length > columns - padding.length - 3) priceData.shift();
  if (priceData.length === 0) continue;
  if ([...new Set(priceData)].length == 1) console.clear();
  await print("\n");
  await print(
    `${yellow(flags.s)}${
      blue("".padStart(columns - flags.s.length - price.toFixed(flags.p).length, "="))
    }${colorize(price.toFixed(flags.p), prevPrice)}\n`,
  );
  await print(
    plot(priceData, {
      min: flags.m,
      max: flags.x,
      height: rows - 2,
      format: format(padding),
      padding,
      symbols: flags.w && winSymbols,
      colors: (price > prevPrice
        ? ["green"]
        : price < prevPrice
        ? ["red"]
        : ["blue"]),
    }),
  );
  await sleep(flags.t);
}

how to run:
deno run --allow-net --unstable https://gist.githubusercontent.com/ngruychev/e9319da0daaeb39c39a87d26d1fbd74a/raw/a72bcf39cf3333e275cb99cc6635859929ad788d/binance-cli-watcher.ts -s ETHUSDT -t 30
how to install:
deno install -qf --allow-net --unstable -n binance-cli-watcher https://gist.github.com/ngruychev/e9319da0daaeb39c39a87d26d1fbd74a