This is a cool utility, but I feel that its existence is entirely predicated on not having a proper build system. A proper build system should be able to be in

This is a cool utility, but I feel that its existence is entirely predicated on not having a proper build system. A proper build system should be able to be integrated with your editor or IDE, and whenever a save happens, a plugin for your editor/IDE, or a filesystem scan by the build system server, should activate a "quick build" using the list of changed files. Of course, entr fills the niche where you want something to happen but don't want to go to the trouble of setting up a build system, so it had that going for it as well. Disclaimer: I'm building such a build system. And now I wonder if I can design it such that it fulfills all of the roles entr does...