Support for customizing the BUILT_TIME_UTC format

[vstojkovic-mongodb]

Would it be possible to add an option that controls how the BUILT_TIME_UTC string is formatted?

[lukaslueg]

No, because it already is guaranteed to be RFC 2822. But you can feed it through built::util::strptime, and format the resulting object.

[vstojkovic-mongodb]

Thank you for the quick response. The reason why I asked is because I was hoping to use built as a build dependency only, without having to include it as a runtime dependency.

I would be happy to contribute a PR for this, if you don't have the time to implement it. However, if it goes against what you want for the API of this crate, feel free to close the issue.

[lukaslueg]

We could add another item (like DEPENDENCIES: [&str, _] and DEPDENDENCIES_STR: &str), if there is a convincing use case and format.

[vstojkovic-mongodb]

I apologize, I didn't explain what I mean properly. The reason I asked whether it's possible to customize the format for the BUILT_TIME_UTC is because my use case requires a different format. To get that format, I would have to do what you said and feed the BUILT_TIME_UTC to the built::util::strptime function and then format the result. In order to do that, I have to add built as a runtime dependency.

If I had the option to customize the BUILT_TIME_UTC format inside my build script, I would be able to keep built as a build dependency only and not have to add it as a runtime dependency too.

[lukaslueg]

A custom formatter is technically possible - it's just a callback - yet I don't see much use for the API. Your's seems to be a niche case. If your desired format is generic enough, we could add it as a standard-item to built as described above. However, since the whole time-keeping code is extremely small, I'd recommend to simply copy&paste built's krono module into your own build-script and customize the format that way.