mutagen VS template-benchmarks-rs

There are two testing techniques you didn't mention: Snapshot tests (which are greatly simplified using the insta crate and mutation testing (which can be done on nightly with my mutagen crate.

How does this compare to mutagen?

Do you mean as part of build.rs? Yes, that's certainly doable, and has been done in the past. You can use env!("OUT_DIR") for that. Examples you may want to refer to include my mutagen crate and criterion.

Would be great if this could include mutation testing.

I wrote a good number of macros though, both macro_rules! and various proc_macros. The latest iteration of overflower has both, for example. mutagen is a mutation testing tool built as a proc macro, and it's helper library has a bunch of macros, too. compact_arena uses macros to tie unique lifetime tags to arenas.

Also there are far more mutation testing frameworks. I maintain the rust-based mutagen one. There are also LLVM-based ones (etc. mull) that can cover multiple languages (but may yield mutations not expressible in your preferred one).

Cargo (and Rust) makes it so easy to write test cases that you should really use it to find these kinds of bugs. And there are other good test crates available: mutagen, quickcheck, etc.

I had a student completely reachitecture my mutagen tool, and saw some working on various clippy contributions.

Any recommendations for rust template engines? I'd like something that can easily render labeled fragments of a template instead of requiring me to split a page into a dozen little files. Kinda like inline {{block}} definitions in Go's html/template. Speed is also nice.

From template-benchmark-rs [0] I found sailfish [1] (fast, but no fragments(?)). render-rs [2] and syn-rsx [3] (2022) both let you write html in rust macros which is cool (maybe that can substitute for fragments?). Then there's gtmpl-rust [4] which is just Go templates reimplemented in rust.

[0]: https://github.com/rosetta-rs/template-benchmarks-rs

[1]: https://github.com/rust-sailfish/sailfish

[2]: https://github.com/render-rs/render.rs last updated Jul 2020

[3]: https://github.com/stoically/syn-rsx last updated Nov 2022

[4]: https://github.com/fiji-flo/gtmpl-rust

Personally, I'd recommend Maud if you don't need something with runtime reloading. Not only is it much faster, it implements a template language that is effectively the Rust-syntax equivalent to Slim or Haml using a procedural macro, so you get compile-time verification that your HTML output is well-formed.

I've been maintaining several benchmark repos based off of template-benchmarks-rs. I've noticed there are several other benchmark repos that are hard to know about.

I'm tempted to collect all of these benchmark repos into a github org to make them easier to find. So far I know of parser, md, argparse, and template languages.

Simple and straightforward. The only thing I'd change personally is using sailfish over markup. Seems to be the fastest templating engine?

As I said in my other post, runtime performance wasn't a concern for me except to catch anything egregious, like mini_markdown hanging. If people want to expand on this with different representative cases and criterion like template-benchmarks-rs, they are welcome to!

That's why I use Sailfish for server-side templating in my Rust web projects. It's ridiculously fast.

As for templating, here's a benchmark that can double as a list of candidates to choose from... though, again, Rust stuff tends to be fast, so don't assume that the slowest templating engine on a Rust-vs-Rust benchmark is going to be slow.

Yeah. You're much better off worrying about template rendering performance or database query optimization than the framework itself.