FAR

Find And Replace string template engine

Provided with a template and a map, Find And Replace will attempt to find all the keys (delimited with ${}) in the template and replace them with the corresponding value in the map. For example:

```rust let template = "${capitalized specific} are my favorite ${category}.";

let mut args = HashMap::new();

args.insert("capitalized specific", "Cats"); args.insert("category", "animal");

let s = far(&template, &args)?;

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

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

```rust let template = "${capitalized specific} are my favorite ${category}.";

let mut args = HashMap::new();

args.insert("capitalized specific", "Cats"); // Note the typo here args.insert("catglory", "animal");

match far(&template, &args) { Ok() => panic!(), Err(e) => { asserteq!( format!("{}", e), r#"missing key: "category"; extraneous key: "catglory""# ); } } ```

Additional examples and weird edge-case behaviors can be found in src/tests.