extern crate mdbook;
#[macro_use]
extern crate clap;

use clap::{App, Arg, SubCommand, ArgMatches};
use mdbook::preprocess::{Preprocessor, PreprocessorContext};

fn main() {
    let matches = app().get_matches();

    if let Some(sub_args) = matches.subcommand_matches("supports") {
        handle_supports(sub_args);
    } else {
        handle_preprocessing(&matches);
    }
}

fn handle_preprocessing(args: &ArgMatches) {

}

fn handle_supports(sub_args: &ArgMatches) {
        let renderer = sub_args.value_of("renderer").expect("Required argument");
        let supported = renderer_is_supported(&renderer);
}

fn renderer_is_supported(renderer: &str) -> bool {
    true
}

fn app() -> App<'static, 'static> {
    app_from_crate!().subcommand(
        SubCommand::with_name("supports")
            .arg(Arg::with_name("renderer").required(true))
            .about(
                "Check whether a renderer is supported by this preprocessor",
            ),
    )
}