Templating library integrations

[kazimuth]

• handlebars
• tera
• askama
• maud

http://www.arewewebyet.org/topics/templating/

[godofdream]

If you point me how you intended to include the localization into e.g. askama I may be of help.

[kazimuth]

That'd be great!

In general each templating library has a different method for integrating custom filters / external functions / whatever. Where possible, we should just supply implementations for those in this library, instead of modifying external libraries. e.g. in tera there's various register_xyz implementations; we could provide one of those in this crate, behind a feature flag.

In askama's case though, I think we need to at least add some sort of support for passing kwargs to templates; currently they only take ordered arguments. It might also be possible to just pass all the members of an askama template struct through to fluent. There's a design space there, explore it at your leisure.

The code in my old PR could give you a hint at where to start. https://github.com/djc/askama/pull/211; it's a little messy and bitrotted, but I added a parser for localize expressions to askama_derive/src/parser.rs, support for embedding a Localize impl in an askama template in askama_derive/src/input.rs, and support for generating calls to that impl in askama_derive/src/generator.rs. The rest of the code in that PR is in this crate.

Keep in mind this project isn't officially "released" yet and i'm going to do a little more iteration on the core design this week (like changing Localize::localize to take an &mut io::Write instead of returning a String).