funcfmt is a simple, lightweight templating library that allows templating using custom runtime context and function traits. It was originally created for exifrename, to allow efficiently processing a format and set of callbacks across thousands of EXIF objects.
Documentation is available on docs.rs, or through
cargo doc --open.
To add funcfmt to your dependencies:
cargo add funcfmt
The basic flow of funcfmt looks like this:
- Given a
FormatMap<T>calledformatters, callformatters.to_format_pieces(), which preprocesses everything into aFormatPieces<T>, where&Tis what your callback function will take as its only argument. This allows avoiding having to reparse the formatters and go through the template each time things are processed. - Call .render(data) on the
FormatPieces<T>.
A very small example with Strings passed in, although you can pass an object
of any type:
use funcfmt::{fm, FormatMap, Render, ToFormatPieces};
fn main() {
let formatters = FormatMap::from([
fm!("foo", |data| Some(format!("foo: {data}"))),
fm!("bar", |data| Some(format!("bar: {data}"))),
fm!("baz", |data| Some(format!("baz: {data}"))),
]);
let fp = formatters.to_format_pieces("{foo}, {bar}").unwrap();
// foo: some data, bar: some data
let data_one = String::from("some data");
println!("{}", fp.render(&data_one).unwrap());
// foo: other data, bar: other data
// note that this doesn't require processing the format again
let data_two = String::from("other data");
println!("{}", fp.render(&data_two).unwrap());
}
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