Consider switching from TOML to KDL for the config file

[tmke8]

Would look like this

pretty-print always
xml-namespace #true
continue-on-error #false

inline-delimiters $ $
block-delimiters $$ $$

newcommand bb #"\mathbb{#1}"#
newcommand d #"\mathrm{d}"#
definecolor blue { RGB 75 120 255 }

[tmke8]

With knus:

#[derive(knus::Decode)]
struct NewCommand {
    #[knus(argument)]
    name: String,
    #[knus(argument)]
    definition: String,
    #[knus(property)]
    default: Option<String>,
}

#[derive(knus::Decode)]
enum Color {
    Rgb(
        #[knus(argument)] u8,
        #[knus(argument)] u8,
        #[knus(argument)] u8,
    ),
}

#[derive(knus::Decode)]
struct DefineColor {
    #[knus(argument)]
    name: String,
    // #[knus(children)]
    // color: Vec<Color>,
    #[knus(child)]
    color: Color,
}

#[derive(knus::DecodeScalar)]
enum PrettyPrint {
    Always,
    Never,
    Auto,
}

#[derive(knus::Decode)]
struct Document {
    #[knus(child, unwrap(argument))]
    pretty_print: Option<PrettyPrint>,
    #[knus(child, unwrap(argument))]
    xml_namespace: Option<bool>,
    #[knus(child, unwrap(argument))]
    continue_on_error: Option<bool>,
    #[knus(children(name = "newcommand"))]
    commands: Vec<NewCommand>,
    #[knus(children(name = "definecolor"))]
    colors: Vec<DefineColor>,
}

[tmke8]

This is blocked on TheLostLambda/knus#30.

[tmke8]

Though, it's only blocked for colors, which we didn't support in TOML either...