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//! Cursor.

use std::fmt;

derive_csi_sequence!("Hide the cursor.", Hide, "?25l");
derive_csi_sequence!("Show the cursor.", Show, "?25h");

/// Goto some position ((1,1)-based).
///
/// # Why one-based?
///
/// ANSI escapes are very poorly designed, and one of the many odd aspects is being one-based. This
/// can be quite strange at first, but it is not that big of an obstruction once you get used to
/// it.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Goto(pub u16, pub u16);

impl Default for Goto {
    fn default() -> Goto { Goto(1, 1) }
}

impl fmt::Display for Goto {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        debug_assert!(self != &Goto(0, 0), "Goto is one-based.");

        write!(f, csi!("{};{}H"), self.1, self.0)
    }
}

/// Move cursor left.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Left(pub u16);

impl fmt::Display for Left {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, csi!("{}D"), self.0)
    }
}

/// Move cursor right.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Right(pub u16);

impl fmt::Display for Right {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, csi!("{}C"), self.0)
    }
}

/// Move cursor up.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Up(pub u16);

impl fmt::Display for Up {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, csi!("{}A"), self.0)
    }
}

/// Move cursor down.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Down(pub u16);

impl fmt::Display for Down {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, csi!("{}B"), self.0)
    }
}