Add atom package (#3709)

packages/atom.rb

+require 'package'
+
+class Atom < Package
+  description 'The hackable text editor'
+  homepage 'https://atom.io/'
+  version '1.42.0'
+  case ARCH
+  when 'x86_64'
+    source_url 'file:///dev/null'
+    source_sha256 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'
+  end
+
+  binary_url ({
+    x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/atom-1.42.0-chromeos-x86_64.tar.xz'
+  })
+  binary_sha256 ({
+    x86_64: '7835a7ba3e5a0cd9a02beb36e94fe41605535ab5fd073aa24306c1c60b087084'
+  })
+
+  depends_on 'alien' => :build
+  depends_on 'fakeroot'
+  depends_on 'gtk3'
+  depends_on 'libsecret'
+  depends_on 'sommelier'
+
+  def self.build
+    system "wget https://github.com/atom/atom/releases/download/v#{version}/atom-amd64.deb"
+    abort 'Checksum mismatch. :/ Try again.'.lightred unless Digest::SHA256.hexdigest( File.read('atom-amd64.deb') ) == '5e9a487da9d7d6530be61d4af2454b0bcfc907537447cf9d0423766e91282ac7'
+    system "alien -t -c atom-amd64.deb"
+    system "tar xvf atom-#{version}.tgz"
+  end
+
+  def self.install
+    FileUtils.mkdir_p "#{CREW_DEST_PREFIX}"
+    FileUtils.mv 'usr/bin', "#{CREW_DEST_PREFIX}"
+    FileUtils.mv 'usr/share', "#{CREW_DEST_PREFIX}"
+  end
+end