Highlight

We have two features left to implement: searching and syntax highlighting. Both of them require the ability to apply a different highlight to our text, so we'll do that.

We'll do everything in the types module, but first we must define the color codes that we'll be using. In ansi define these namespaced constants:

/// Codes for 16-colors terminal escape sequences (foreground)
pub const FgColor = struct {
    pub const default: u8 = 39;
    pub const black: u8 = 30;
    pub const red: u8 = 31;
    pub const green: u8 = 32;
    pub const yellow: u8 = 33;
    pub const blue: u8 = 34;
    pub const magenta: u8 = 35;
    pub const cyan: u8 = 36;
    pub const white: u8 = 37;
    pub const black_bright: u8 = 90;
    pub const red_bright: u8 = 91;
    pub const green_bright: u8 = 92;
    pub const yellow_bright: u8 = 93;
    pub const blue_bright: u8 = 94;
    pub const magenta_bright: u8 = 95;
    pub const cyan_bright: u8 = 96;
    pub const white_bright: u8 = 97;
};

/// Codes for 16-colors terminal escape sequences (background)
pub const BgColor = struct {
    pub const default: u8 = 49;
    pub const black: u8 = 40;
    pub const red: u8 = 41;
    pub const green: u8 = 42;
    pub const yellow: u8 = 43;
    pub const blue: u8 = 44;
    pub const magenta: u8 = 45;
    pub const cyan: u8 = 46;
    pub const white: u8 = 47;
    pub const black_bright: u8 = 100;
    pub const red_bright: u8 = 101;
    pub const green_bright: u8 = 102;
    pub const yellow_bright: u8 = 103;
    pub const blue_bright: u8 = 104;
    pub const magenta_bright: u8 = 105;
    pub const cyan_bright: u8 = 106;
    pub const white_bright: u8 = 107;
};