gulp-iconutil/gulp-iconutil.js

gulp-iconutil creates .icns from .iconset

const fs = require("fs");
const { join, basename } = require("path");
const { spawn } = require("child_process");
const through = require("through2");
const temporary = require("temporary");
const del = require("del");
const Vinyl = require("vinyl");
const PluginError = require("plugin-error");

const PLUGIN_NAME = "gulp-iconutil";

module.exports = function iconUtil(icnsName) {
  if (!icnsName) {
    throw new PluginError(PLUGIN_NAME, "Missing icns name");
  }

  const icons = [];

  const bufferContents = function(file, encoding, callback) {
    if (file.isNull()) {
      return callback();
    }

    if (file.isStream()) {
      this.emit(
        "error",
        new PluginError(PLUGIN_NAME),
        "Streams are not supported"
      );
      return callback();
    }

    icons.push(file);
    callback();
  };

  const endStream = function(callback) {
    if (!icons.length) {
      return callback();
    }

    const tmpDir = new temporary.Dir();
    const iconsetPath = join(tmpDir.path, "tmp.iconset");
    const outputPath = join(tmpDir.path, "tmp.icns");

    fs.mkdirSync(iconsetPath);

    for (const icon of icons) {
      fs.writeFileSync(join(iconsetPath, basename(icon.path)), icon.contents);
    }

    const program = spawn("/usr/bin/iconutil", ["-c", "icns", iconsetPath]);
    program.stdout.on("end", () => {
      const icns = new Vinyl({
        cwd: icons[0].cwd,
        base: icons[0].base,
        path: join(icons[0].base, icnsName),
        contents: fs.readFileSync(outputPath)
      });
      this.push(icns);
      del(tmpDir.path, { force: true }).then(() => callback());
    });
  };

  return through.obj(bufferContents, endStream);
};