nsrun.js

#!/usr/bin/env node
"use strict";

const cp = require("child_process");
const find = require("lodash.find");
const fs = require("fs");
const minimist = require("minimist");
const path = require("path");

let pkgPath = process.cwd();
let pkgJsonFile = null;
let pkgJson = null;

/** ***************** FIND PACKAGE.JSON ******************/
while (pkgJson === null && path.dirname(pkgPath) !== pkgPath) {
  try {
    pkgJsonFile = path.join(pkgPath, "package.json");
    pkgJson = require(pkgJsonFile);
  } catch (e) {
    pkgPath = path.dirname(pkgPath);
  }
}
if (pkgJson === null) {
  console.log(
    "Could not find a package.json in the current directory or any parent directories."
  );
  console.log("Are you in a node project?");
  process.exit(1);
}
const humanReadablePkgPath = `./${path.relative(process.cwd(), pkgJsonFile)}`;

/** **************** PARSE OUT SCRIPTS FROM PACKAGE.JSON ***********/
const scripts = Object.keys(pkgJson.scripts || {}).map(function(name) {
  return {
    name,
    script: pkgJson.scripts[name]
  };
});
if (scripts.length === 0) {
  console.log(`${pkgJsonFile}: no scripts listed.`);
  process.exit(1);
}

/** ************** FIGURE OUT WHAT SCRIPT TO RUN *****************/
const currentProcessPath = process.argv.slice(0, 2).join(" ");
const argv = minimist(process.argv.slice(2));
let args = argv._ || [];
const scriptName = args.shift();
const scriptToRun = find(scripts, { name: scriptName });

/** ************* LIST ALL SCRIPTS ON NO INPUT *******************/
if (!scriptName) {
  console.log(`${scripts.length} scripts in ${humanReadablePkgPath}:`);
  scripts.forEach(function(script) {
    console.log(` * ${script.name}`);
  });
  process.exit(0);
}

/** ************* ERROR ******************************************/
if (!scriptToRun) {
  console.log(
    `${humanReadablePkgPath}: No script found with name "${scriptName}"`
  );
  process.exit(1);
}

/** ************* RUN SCRIPT *************************************/
process.env.PATH =
  path.join(pkgPath, "node_modules", ".bin") + ":" + process.env.PATH;

// convert npm run-script (and all aliases) to nsrun
scriptToRun.script = scriptToRun.script
  .replace(/npm run-script/g, currentProcessPath)
  .replace(/npm run/g, currentProcessPath)
  .replace(/npm test/g, currentProcessPath + " test")
  .replace(/npm start/g, currentProcessPath + " start")
  .replace(/npm stop/g, currentProcessPath + " stop")
  .replace(/npm restart/g, currentProcessPath + " restart");

args = args.map(function(arg) {
  return `'${arg}'`;
});
let command = "";

if (/\$[0-9]|\$\*/.test(scriptToRun.script)) {
  let found = [];

  command = scriptToRun.script.replace(/(\$[0-9])/g, function(v) {
    v = v.substr(1) - 1;
    if (typeof args[v] === "undefined") return "$" + v++;
    found.push(v);
    return args[v];
  });

  // TODO : Add a --nsrun-no-clear to preserve arguments
  found.map(function(v) {
    args[v] = "";
  });

  command = command.replace(/(\$\*)/, args.join(" "));

  if (/\$[0-9]/.test(command)) {
    console.error(
      `The script (${scriptName}) expected additional positional arguments!`
    );
    process.exit(1);
  }
} else {
  command = scriptToRun.script + " " + args.join(" ");
}

const child = cp.spawn(command, {
  cwd: process.cwd(),
  env: process.env,
  stdio: "inherit",
  shell: true
});
child.on("error", function(err) {
  console.error(err.stack);
});
child.on("exit", function(code, signal) {
  process.exit(code);
});

[
  "SIGUSR1",
  "SIGTERM",
  "SIGINT",
  "SIGPIPE",
  "SIGHUP",
  "SIGBREAK",
  "SIGWINCH"
].map(function(signal) {
  process.on(signal, function() {
    child.kill(signal);
  });
});