use crate::common::*;

#[derive(StructOpt)]
pub(crate) struct Options {
  #[structopt(
    long = "unstable",
    short = "u",
    help = "Enable unstable features.",
    long_help = "Enable unstable features. To avoid premature stabilization and excessive version \
                 churn, unstable features are unavailable unless this flag is set. Unstable \
                 features are not bound by semantic versioning stability guarantees, and may be \
                 changed or removed at any time."
  )]
  unstable: bool,
  #[structopt(
    long = "color",
    default_value = use_color::AUTO,
    set = ArgSettings::CaseInsensitive,
    possible_values = use_color::VALUES,
    help = "Print colorful output.",
    long_help = "Print colorful output. When `auto`, the default, colored output is only enabled \
                 if imdl detects that it is connected to a terminal, the `NO_COLOR` environment \
                 variable is not set, and the `TERM` environment variable is not set with a \
                 value of `dumb`.",
  )]
  pub(crate) use_color: UseColor,
}

impl Options {
  pub(crate) fn require_unstable(&self, feature: &'static str) -> Result<(), Error> {
    if self.unstable {
      Ok(())
    } else {
      Err(Error::Unstable { feature })
    }
  }
}