clap 1.0.0

A simple to use, efficient, and full featured Command Line Argument Parser
Documentation 
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use std::collections::HashSet;
use std::collections::BTreeSet;
use std::fmt::{ Display, Formatter, Result };

pub struct PosBuilder<'n> {
    pub name: &'n str,
    /// The string of text that will displayed to the user when the application's
    /// `help` text is displayed
    pub help: Option<&'n str>,
    /// If this is a required by default when using the command line program
    /// i.e. a configuration file that's required for the program to function
    /// **NOTE:** required by default means, it is required *until* mutually
    /// exclusive arguments are evaluated.
    pub required: bool,
    /// Allow multiple occurrences of an option argument such as "-c some -c other"
    pub multiple: bool,
    /// A list of names of other arguments that are *required* to be used when
    /// this flag is used
    pub requires: Option<HashSet<&'n str>>,
    /// A list of names for other arguments that *may not* be used with this flag
    pub blacklist: Option<HashSet<&'n str>>,
    /// A list of possible values for this argument
    pub possible_vals: Option<BTreeSet<&'n str>>,
    /// The index of the argument
    pub index: u8,
    pub num_vals: Option<u8>,
    pub max_vals: Option<u8>,
    pub min_vals: Option<u8>,
    pub empty_vals: bool,
    pub global: bool
}

impl<'n> Display for PosBuilder<'n> {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{}{}{}{}",
                if self.required { "<" } else {"["},
                self.name,
                if self.required { ">" } else {"]"},
                if self.multiple {"..."}else{""})
    }
}