refactor: replaced build and test scripts with gulpfile

Note: You may need to install gulp-cli (`npm install -g gulp-cli`)
This is much faster, especially for `npm test`, because stuff happens
in parallel. Also, this adds watch functionality for static project
files (the lack of which has annoyed me quite a bit).

bin/bootstrap-osx

@@ -19,7 +19,7 @@ nvm install 9.4
 nvm alias default 9.4
 
 # install/update global packages
-npm install -g tslint typescript-formatter
+npm install -g [email protected]
 gem install copyright-header
 
 # install CircleCI CLI

gulpfile.js

@@ -0,0 +1,160 @@
+const _spawn = require("child_process").spawn
+const { join } = require("path")
+
+const gulp = require("gulp")
+const cached = require("gulp-cached")
+// const debug = require("gulp-debug")
+// const exec = require("gulp-exec")
+const pegjs = require("gulp-pegjs")
+const sourcemaps = require("gulp-sourcemaps")
+const gulpTslint = require("gulp-tslint")
+const tslint = require("tslint")
+const ts = require("gulp-typescript")
+
+const tsProject = ts.createProject("tsconfig.json", {
+  declaration: true,
+})
+const reporter = ts.reporter.longReporter()
+
+const tsSources = "src/**/*.ts"
+const testTsSources = "test/**/*.ts"
+const pegjsSources = "src/*.pegjs"
+
+const staticFiles = ["package.json", "package-lock.json", "static/**", ".snyk"]
+
+let destDir = "build"
+
+class TaskError extends Error {
+  toString() {
+    return this.messsage
+  }
+}
+
+function setDestDir(path) {
+  destDir = path
+}
+
+const children = []
+
+process.env.FORCE_COLOR = true
+
+function spawn(cmd, args, cb) {
+  const child = _spawn(cmd, args, { stdio: "pipe", shell: true, env: process.env })
+  children.push(child)
+
+  const output = []
+  child.stdout.on("data", (data) => output.push(data))
+  child.stderr.on("data", (data) => output.push(data))
+
+  child.on("exit", (code) => {
+    if (code !== 0) {
+      console.log(output.join(""))
+      die()
+    }
+    cb()
+  })
+
+  return child
+}
+
+function die() {
+  for (const child of children) {
+    !child.killed && child.kill()
+  }
+  process.exit(1)
+}
+
+gulp.task("check-licenses", (cb) =>
+  spawn("./bin/check-licenses", [], cb)
+)
+
+gulp.task("mocha", (cb) =>
+  spawn("node_modules/.bin/nyc", ["node_modules/.bin/mocha"], cb)
+)
+
+gulp.task("pegjs", () =>
+  gulp.src(pegjsSources)
+    .pipe(pegjs({ format: "commonjs" }))
+    .pipe(gulp.dest(join(destDir, "src")))
+)
+
+gulp.task("pegjs-watch", () =>
+  gulp.watch(pegjsSources, gulp.parallel("pegjs"))
+)
+
+gulp.task("static", () => {
+  return gulp.src(staticFiles, { base: "./" })
+    .pipe(cached("static"))
+    .pipe(gulp.dest(destDir))
+})
+
+gulp.task("static-watch", () => {
+  return gulp.watch(staticFiles, gulp.parallel("static"))
+})
+
+gulp.task("tsc", () =>
+  tsProject.src()
+    .pipe(sourcemaps.init())
+    .pipe(tsProject(reporter))
+    .on("error", die)
+    .pipe(sourcemaps.write())
+    .pipe(gulp.dest(join(destDir, "src")))
+)
+
+gulp.task("tsc-watch", () =>
+  _spawn("tsc", [
+      "-w",
+      "--pretty",
+      "--declaration",
+      "-p", __dirname,
+      "--outDir", join(destDir, "src"),
+    ],
+    { stdio: "inherit" },
+  )
+)
+
+gulp.task("tsfmt", (cb) => {
+  spawn("node_modules/.bin/tsfmt", ["--verify"], cb)
+})
+
+gulp.task("tsfmt-watch", () => {
+  const verify = (path) => {
+    try {
+      _spawn("node_modules/.bin/tsfmt", ["--verify", path], { stdio: "inherit" })
+    } catch (_) { }
+  }
+
+  return gulp.watch([tsSources, testTsSources])
+    .on("add", verify)
+    .on("change", verify)
+})
+
+gulp.task("tslint", () =>
+  gulp.src(tsSources)
+    .pipe(cached("tslint"))
+    .pipe(gulpTslint({
+      program: tslint.Linter.createProgram("./tsconfig.json"),
+      formatter: "verbose"
+    }))
+    .pipe(gulpTslint.report())
+)
+
+gulp.task("tslint-tests", () =>
+  gulp.src(testTsSources)
+    .pipe(cached("tslint-tests"))
+    .pipe(gulpTslint({
+      formatter: "verbose"
+    }))
+    .pipe(gulpTslint.report())
+)
+
+gulp.task("tslint-watch", () =>
+  gulp.watch([tsSources, testTsSources], gulp.parallel("tslint", "tslint-tests"))
+)
+
+gulp.task("lint", gulp.parallel("check-licenses", "tslint", "tslint-tests", "tsfmt"))
+gulp.task("build", gulp.parallel("pegjs", "static", "tsc"))
+gulp.task("dist", gulp.series((done) => { setDestDir("dist"); done() }, "lint", "build"))
+gulp.task("test", gulp.parallel("build", "lint", "mocha"))
+gulp.task("watch", gulp.parallel("pegjs-watch", "static-watch", "tsc-watch", "tsfmt-watch", "tslint-watch"))
+gulp.task("default", gulp.series("watch"))