Crate far

Expand description

Provided with a template and a map, FAR will attempt to find all the keys (delimited with {{ and }}) in the template and replace them with the corresponding value in the map. By default, map values are rendered by their Display impl. For example:

let template = "{{specific}} are my favorite {{category}}.";

#[derive(Render)]
struct Replacements {
    specific: String,
    category: String,
}

let found = find(template)?;

let replacements = Replacements {
    specific: "Cats".to_owned(),
    category: "animal".to_owned(),
};

let s = found.replace(&replacements);

assert_eq!(s, "Cats are my favorite animal.");

If it fails for some reason, an explanation of why will be returned:

// Note the typo ----------------------------> vvvvvvvv
let template = "{{specific}} are my favorite {{catglory}}.";

#[derive(Debug, Render)]
struct Replacements {
    specific: String,
    category: String,
}

let errors = find::<_, Replacements>(template).unwrap_err();

assert_eq!(
    format!("{}", errors),
    r#"missing key "category", extraneous key "catglory""#
);