mono-runner/lib/utils/out.ts

A script runner for mono repos that just works. Use Mono to run separate compilers and dev servers for your packages at once, build only dependent packages or format everything at once.

import type { StreamInfo } from "./execute";

const MAX_WIDTH = process.stdout.columns || 160;
const getWidthRegex = (pcg: string) => {
  const width = MAX_WIDTH - pcg.length - 2;
  return new RegExp(`.{1,${width}}`, "g");
};

const packageToColor = (name: string) => {
  const hash = name.split("").reduce((acc, cur) => {
    return acc + cur.charCodeAt(0);
  }, 0);
  const idx = hash % 6;
  const colors = [
    "\x1b[31m",
    "\x1b[32m",
    "\x1b[33m",
    "\x1b[34m",
    "\x1b[35m",
    "\x1b[35m",
  ];
  return colors[idx];
};

export const drawConsole = (streams: StreamInfo[], quiet?: boolean) => {
  streams.forEach((s) => {
    const { stream, level, package: pcg } = s;
    const encoder = new TextDecoder();
    const color = packageToColor(pcg);
    const regex = getWidthRegex(pcg);

    const push = (chunk: Uint8Array) => {
      const current = encoder.decode(chunk);
      const lines = current.split("\n").flatMap((line) => {
        const m = line.match(regex);
        if (m) {
          return m;
        } else {
          return [line];
        }
      });
      if (quiet && level == "err") {
        console.error(`${pcg}\: \n`);
      }
      lines.forEach((line, i) => {
        if (level == "err") {
          if (quiet) {
            console.error(`${line}`);
          } else {
            console.error(`${color}${pcg}\x1b[0m: ${line}`);
          }
        } else if (!quiet) {
          console.log(`${color}${pcg}\x1b[0m: ${line}`);
        }
      });
      if (quiet && level == "err") {
        console.error(`\n\n`);
      }
    };
    (stream as any).on("data", push);
  });
};