added tryGetVersion method

[Meowhal]

fix #68
When launched from node, the version is obtained by reading package.json, and if package.json is not found, the version is displayed as 0.0.0.

[xayanide]

I think there should be a way of using 1 return statement on the tryGetVersion method though. I have thought of an optional alternative.

  private tryGetVersion(): string {
    let version = `${process.env.npm_package_version}`;
    if (!process.env.npm_package_version) {
      try {
        const packag = require("../package.json");
        version = packag.version;
      } catch {
        version = "0.0.0";
      }
    }
    // it is possible for package.json to exist but with no version field, so it can still return as undefined
    return version;
  }

The way it is implemented right now looks good to me, also yours doesn't waste any more resources if process.env.npm_package_version is defined which is nice.

---

Another implementation without using process.env.npm_package_version

This would return the version as 0.0.0 if

• Package.json file do not exist
• version field do not exist in the file.

Running !info or !version with this, version will be defined (0.0.0 if falsy) no matter if the process was run with npm script or node with this one. I hope.

  private tryGetVersion(): string {
    try {
      const packag = require("../package.json");
      // "version": "1.5.17" field missing
      if (!packag.version) return "0.0.0";
      return packag.version;
    } catch {
      // handle module not found error/crash
      return "0.0.0";
    }
  }

[Meowhal]

I looked at your pre-edited code and realized that it is possible the version does not exist in package.json. I will fix the code later.

[Meowhal]

Finally, I commited this code. Your insights were very helpful.

private tryGetVersion(): string {
  if (process.env.npm_package_version) return process.env.npm_package_version;
  try {
    return require("../package.json").version ?? "0.0.0";
  } catch {
    return "0.0.0";
  }
}

I prefer the early return style. But i'm not going to debate which style is better. What is more important with such a small code is whether we are achieving our objectives.😉