tasks.js

//@ts-check

process.env["BS_VSCODE"] = "1";

var fs = require("fs");
var path = require("path");
var cp = require("child_process");
var sourceDirs = [
  "ext",
  "common",
  "syntax",
  "depends",
  "core",
  "super_errors",
  "outcome_printer",
  "bsb",
  "main",
  "others",
  "stdlib-406",
  "runtime",
  "test",
  "ounit_tests",
  "bsb_helper"
];

var buildAppending = false;
var isBuilding = false;
var ninjaFile = require("./ninja.js");
var jscompDir = path.join("..", "jscomp");
function rebuild() {
  console.log(">>>> Start compiling");
  if (isBuilding) {
    buildAppending = true;
  } else {
    isBuilding = true;
    var p = cp.spawn(ninjaFile.vendorNinjaPath, [], {
      stdio: ["inherit", "inherit", "pipe"]
    });
    p.on("exit", buildFinished);
  }
}
/**
 *
 * @param {number} code
 * @param {string} signal
 */
function buildFinished(code, signal) {
  isBuilding = false;
  if (buildAppending) {
    buildAppending = false;
    rebuild();
  } else {
    if (code !== 0) {
      console.log(`File "BUILD", line 1, characters 1-1:`);
      console.log(`Error: Failed to build`);
    }
    console.log(">>>> Finish compiling");
    // TODO: check ninja exit error code
    if (code === 0) {
      // This is not always correct
      ninjaFile.updateDev();
    }
  }
}
/**
 *
 * @param {string} eventType
 * @param {string} filename
 */
function onSourceChange(eventType, filename) {
  // console.log('event ', eventType,filename)
  if (filename.endsWith(".ml") || filename.endsWith(".mli")) {
    rebuild();
  }
}

sourceDirs.forEach(x => {
  fs.watch(path.join(jscompDir, x), "utf8", onSourceChange);
});
rebuild();