Ruby script to toggle night-mode hack on Slack Desktop app - Mac only, maybe linux

README.md

- IMPORTANT

For security, since this script injects CSS via AJAX, first fork the main slack night mode repo. The reason is explained here

Installation

• save this script wherever you keep your ruby scripts for example ~/lacostenycoder/scripts/ruby/
• change the URL in the ruby script to use YOUR repo. The rawgit.com file is created when you fork the repo.
• For non-MacOS, find where the slack files are and replace line 17 to point to correct path, thanks simbalinux so you would change line 17 for ubuntu like this
  • @file_target = '/usr/lib/slack/resources/app.asar.unpacked/src/static/ssb-interop.js'
• make script executable sudo chmod +x nightslack
• symlink to a PATH load for example: ln -s /Users/lacostenycoder/dev/ruby/nightslack.rb /usr/local/bin/nightslack
• Or if you prefer just drop the .rb from the filename and move it directly to /usr/local/bin/nightslack

How to use this

From a terminal simply type nightslack to start desktop app in night-mode.

To toggle back to day mode, simpley run nightslack -d to pass the day mode option. This will start or restart a running slack desktop in the desired mode!

Keeping your forked repo up to date

• To update styles, sync your forked repo with upstream but be sure to inspect the css to insure it doesn't contain js code injeciton.

nightslack.rb

#!/usr/bin/env ruby
slack_pid = `ps -axcf -S -O%cpu | grep Slack | awk '{print $2}' | head -n 1`.strip
unless slack_pid.empty?
  `kill -9 #{slack_pid}`
end
js_code = <<-JS
document.addEventListener('DOMContentLoaded', function() {
 $.ajax({
   url: 'https://rawgit.com/lacostenyc/slack-night-mode/master/css/raw/black.css',
   success: function(css) {
     $("<style></style>").appendTo('head').html(css);
   }
 });
});
JS

@file_target = '/Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js'
`cp #{@file_target} #{@file_target}.bak`
@current_file = File.read(@file_target) 
@normal_mode = @day_mode_set ? @current_file : @current_file.split(js_code).first
@night_mode = @normal_mode + js_code

use_day_mode = ARGV[0] == '-d'
def set_mode(mode)
  if mode == 'd'
    File.open(@file_target, 'w'){|f| f.puts @normal_mode}
		puts "Slack Normal (day) mode has been set!"
  else
    File.open(@file_target, 'w'){|f| f.puts @night_mode}
		puts "Slack Normal night mode has been set!"
  end
end

use_day_mode ? set_mode('d') : set_mode('n')

`open -a "Slack"`