evar 0.2.0

Modern ergonomic math calculator inspired by eva
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use bpaf::Bpaf;

#[derive(Debug, Clone)]
pub enum AngleUnit {
    Radian,
    Degrees,
}

#[derive(Bpaf, Debug)]
#[bpaf(options, version)]
/// Modern ergonomic math calculator inspired by eva
pub struct Args {
    /// Use degrees instead of radians
    #[bpaf(short('d'), long("degrees"), switch, map(|b| if b {AngleUnit::Degrees} else {AngleUnit::Radian}))]
    pub angle_unit: AngleUnit,

    /// Number of decimal places in output (0-63) [default: None]
    #[bpaf(
        short,
        long,
        guard(fix_in_range, "fix must be in range 0-63"),
        fallback(None)
    )]
    pub fix: Option<usize>,

    /// Disable colored output
    #[bpaf(long, fallback(false))]
    pub no_color: bool,

    /// Print parsed expression for debug purpose
    #[bpaf(long)]
    pub debug: bool,
}

fn fix_in_range(fix: &Option<usize>) -> bool {
    match fix {
        None => true,
        Some(fix) => (0..64).contains(fix),
    }
}