It may have a somewhat different focus (extensive and quickly accessible clipboard history), but you might find Ditto (Windows) interesting to have a look at.<p><a href="http://ditto-cp.sourceforge.net/" rel="nofollow">http://ditto-cp.sourceforge.net/</a><p>I've missed having something similar on this Ubuntu machine I'm using. I'll have a look at CopyQ when my time frees up.<p>P.S. I seem to recall reading that Ditto allowed at least some level of hooking/triggering based upon content, but I never used it and I may be mis-remembering.
Hopefully there is some consideration (somehow) for <i>not</i> monitoring the many passwords and passphrases that flow through clipboards. I took a quick look, but couldn't find acknowledgment.<p>Maybe we need a secure clipboard that guarantees (again, somehow) purging 1) immediately after a paste, and 2) after a specified time period such as 30 seconds.
It may be worth adding a section to your readme with the dependencies you use / how it works.<p>I had a look at the code because I was curious about how Javascript could interact with the clipboard. I can see that you use "clipboard-watcher" which in turn uses "NodObjC" - which also explains why this is OSX only.