`quote`-compatible example

[rambip]

I think it would be very valuable to have an example in the root documentation showing how to use with the quote crate.

Something like this:

fn main() {
    let rust_snippet = quote!{
        fn hello_world() {println!("hello world !")}
    };

    let abstract_file : File = syn::parse2(rust_snippet);
    let pretty_rust = prettyplease::unparse(abstract_file);

    println!(pretty_rust);
}

[inferiorhumanorgans]

This seems to be a really common theme (without an explicitly spelled out answer) for prettyplease issues. In short the answer is to manually construct a File object and use syn::parse2 to convert the TokenStream into Items that File wants.

[tamaro-skaljic]

I currently use https://crates.io/crates/rust-format (which is 3 years old) to do that.