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pub struct HelpText<'a> {
    pub name: &'a str,
    pub version: &'a str,
    pub syntax: &'a str,
    pub summary: &'a str,
    pub long_help: &'a str,
    pub display_usage: bool,
}

pub struct CoreOptions<'a> {
    options: getopts::Options,
    help_text: HelpText<'a>,
}

impl<'a> CoreOptions<'a> {
    pub fn new(help_text: HelpText<'a>) -> Self {
        let mut ret = CoreOptions {
            options: getopts::Options::new(),
            help_text,
        };
        ret.options
            .optflag("", "help", "print usage information")
            .optflag("", "version", "print name and version number");
        ret
    }
    pub fn optflagopt(
        &mut self,
        short_name: &str,
        long_name: &str,
        desc: &str,
        hint: &str,
    ) -> &mut CoreOptions<'a> {
        self.options.optflagopt(short_name, long_name, desc, hint);
        self
    }
    pub fn optflag(
        &mut self,
        short_name: &str,
        long_name: &str,
        desc: &str,
    ) -> &mut CoreOptions<'a> {
        self.options.optflag(short_name, long_name, desc);
        self
    }
    pub fn optflagmulti(
        &mut self,
        short_name: &str,
        long_name: &str,
        desc: &str,
    ) -> &mut CoreOptions<'a> {
        self.options.optflagmulti(short_name, long_name, desc);
        self
    }
    pub fn optopt(
        &mut self,
        short_name: &str,
        long_name: &str,
        desc: &str,
        hint: &str,
    ) -> &mut CoreOptions<'a> {
        self.options.optopt(short_name, long_name, desc, hint);
        self
    }
    pub fn optmulti(
        &mut self,
        short_name: &str,
        long_name: &str,
        desc: &str,
        hint: &str,
    ) -> &mut CoreOptions<'a> {
        self.options.optmulti(short_name, long_name, desc, hint);
        self
    }
    pub fn usage(&self, summary: &str) -> String {
        self.options.usage(summary)
    }
    pub fn parse(&mut self, args: Vec<String>) -> getopts::Matches {
        let matches = match self.options.parse(&args[1..]) {
            Ok(m) => Some(m),
            Err(f) => {
                eprint!("{}: error: ", self.help_text.name);
                eprintln!("{}", f);
                ::std::process::exit(1);
            }
        }
        .unwrap();
        if matches.opt_present("help") {
            let usage_str = if self.help_text.display_usage {
                format!(
                    "\n {}\n\n Reference\n",
                    self.options.usage(self.help_text.summary)
                )
                .replace("Options:", " Options:")
            } else {
                String::new()
            };
            print!(
                "
 {0} {1}

 {0} {2}
{3}{4}
",
                self.help_text.name,
                self.help_text.version,
                self.help_text.syntax,
                usage_str,
                self.help_text.long_help
            );
            crate::exit!(0);
        } else if matches.opt_present("version") {
            println!("{} {}", self.help_text.name, self.help_text.version);
            crate::exit!(0);
        }
        matches
    }
}

#[macro_export]
macro_rules! app {
    ($syntax: expr, $summary: expr, $long_help: expr) => {
        uucore::coreopts::CoreOptions::new(uucore::coreopts::HelpText {
            name: executable!(),
            version: env!("CARGO_PKG_VERSION"),
            syntax: $syntax,
            summary: $summary,
            long_help: $long_help,
            display_usage: true,
        })
    };
    ($syntax: expr, $summary: expr, $long_help: expr, $display_usage: expr) => {
        uucore::coreopts::CoreOptions::new(uucore::coreopts::HelpText {
            name: executable!(),
            version: env!("CARGO_PKG_VERSION"),
            syntax: $syntax,
            summary: $summary,
            long_help: $long_help,
            display_usage: $display_usage,
        })
    };
}