Cloud9 has a command under Tools called "Strip Trailing Space". I want to automatically run this command before every time I save a file, so I can be sure my files never contain trailing spaces. How is that done?
After frustratedly Googling for quite a while, I can find no documentation on how to achieve stuff like this. They claim Cloud9 is the most hackable IDE in the world though, so it ought to be possible.
Well this is embarrassing, but I combed through the preferences again and found the option On Save, Strip Whitespace under Cloud9 -> Preferences -> Code Editor (Ace).