Support gulp-generated files

[notpushkin]

Ones that don't exist on disk (i. e. when files are concatenated or renamed in the current pipe, or when).

This would probably require rewriting the asar/lib/filesystem module in such a way that it doesn't deal with fs directly. Even better would be to make a backend for node-archiver (that's what I'm doing now) or something.

Branch: generated-files

[notpushkin]

Current implementation is flawed. For example, see the asar branch of Songbee/desktop. Everything works well, except that it outputs original files somehow (instead of compiled ones) and they're shifted a bit:

$ gulp
$ cd dist
$ asar e songbee.asar .
$ head -n 8 src/main.js
ort electron, { app, BrowserWindow, Menu, Tray } from "electron";
import path from "path";
import url from "url";

import Manager from "./backend";
global.backend = new Manager();

let mainWindow, tray; // keep a reference

$ tail -n 4 src/main.js
app.on("will-quit", () => {
  global.backend.quit();
});
imp

Here's the gulp task for reference:

gulp.task("build", () => {
  const f = {
    noModules: filter(["!node_modules/**/*"], { restore: true }),
    js: filter(["**/*.js"], { restore: true })
  };

  gulp.src([
    "./package.json",
    "./node_modules*/**",
    "./src*/**",

    // Do not include Electron and READMEs (which are surprisingly big)
    "!./node_modules/.bin/**",
    "!./node_modules/electron*/**",
    "!./node_modules/gulp*/**",
    "!./node_modules/gulp*",
    "!./**/README*",
  ]).pipe(f.noModules)
    .pipe(f.js)
      .pipe(sourcemaps.init())
        .pipe(babel())
      .pipe(sourcemaps.write())
    .pipe(f.js.restore)
    .pipe(f.noModules.restore)
    .pipe(asar("songbee.asar"))
    .pipe(gulp.dest("./dist"));
});