

Yeah, I’m building more-or-less an alternative to make
. Major difference is that I’m not using shell commands, but rather users will define their build code in Rust …because it’s intended to be a build tool for Rust applications (beyond what cargo
does).
Thanks for the comment, though. So far, I haven’t limited inputs to just be files, so I don’t actually assume to have a last-modified timestamp. Rather, my assumption is that I can get some value which changes when the input changes. In the case of a file, that’s the last-modified timestamp, but theoretically, it could also be a hash. But that means I have to store these values to be able to detect a change. Being able to just say that one thing is newer than the other without storing anything, that is pretty cool and might be worth changing my assumption for.
Yeah, good point. It also doesn’t update when the content of a file changes. So, in order to detect a change in a directory, you have to walk all the files and sub-directories and the directory itself to get the last-modified timestamp for each of them. Then determine the highest last-modified and compare it to what you measured in a previous run. If they differ, a change happened.