Move `Theme` type to `iced_core`

5 files changed, 849 insertions, 8 deletions

diff --git a/core/Cargo.toml b/core/Cargo.toml
index 2360e822..e71b75ae 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -19,9 +19,8 @@ smol_str.workspace = true
 thiserror.workspace = true
 web-time.workspace = true
 xxhash-rust.workspace = true
-
 palette.workspace = true
-palette.optional = true
+once_cell.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 raw-window-handle.workspace = true
diff --git a/core/src/color.rs b/core/src/color.rs
index 6526e220..da40ca15 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -1,4 +1,3 @@
-#[cfg(feature = "palette")]
 use palette::rgb::{Srgb, Srgba};
 
 /// A color in the `sRGB` color space.
@@ -210,7 +209,6 @@ macro_rules! color {
     }};
 }
 
-#[cfg(feature = "palette")]
 /// Converts from palette's `Rgba` type to a [`Color`].
 impl From<Srgba> for Color {
     fn from(rgba: Srgba) -> Self {
@@ -218,7 +216,6 @@ impl From<Srgba> for Color {
     }
 }
 
-#[cfg(feature = "palette")]
 /// Converts from [`Color`] to palette's `Rgba` type.
 impl From<Color> for Srgba {
     fn from(c: Color) -> Self {
@@ -226,7 +223,6 @@ impl From<Color> for Srgba {
     }
 }
 
-#[cfg(feature = "palette")]
 /// Converts from palette's `Rgb` type to a [`Color`].
 impl From<Srgb> for Color {
     fn from(rgb: Srgb) -> Self {
@@ -234,7 +230,6 @@ impl From<Srgb> for Color {
     }
 }
 
-#[cfg(feature = "palette")]
 /// Converts from [`Color`] to palette's `Rgb` type.
 impl From<Color> for Srgb {
     fn from(c: Color) -> Self {
@@ -242,7 +237,6 @@ impl From<Color> for Srgb {
     }
 }
 
-#[cfg(feature = "palette")]
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 002336ee..d076413e 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -30,6 +30,7 @@ pub mod overlay;
 pub mod renderer;
 pub mod svg;
 pub mod text;
+pub mod theme;
 pub mod time;
 pub mod touch;
 pub mod widget;
@@ -76,6 +77,7 @@ pub use shadow::Shadow;
 pub use shell::Shell;
 pub use size::Size;
 pub use text::Text;
+pub use theme::Theme;
 pub use transformation::Transformation;
 pub use vector::Vector;
 pub use widget::Widget;
diff --git a/core/src/theme.rs b/core/src/theme.rs
new file mode 100644
index 00000000..21ba2a37
--- /dev/null
+++ b/core/src/theme.rs
@@ -0,0 +1,221 @@
+//! Use the built-in theme and styles.
+pub mod palette;
+
+pub use palette::Palette;
+
+use std::fmt;
+use std::sync::Arc;
+
+/// A built-in theme.
+#[derive(Debug, Clone, PartialEq, Default)]
+pub enum Theme {
+    /// The built-in light variant.
+    #[default]
+    Light,
+    /// The built-in dark variant.
+    Dark,
+    /// The built-in Dracula variant.
+    Dracula,
+    /// The built-in Nord variant.
+    Nord,
+    /// The built-in Solarized Light variant.
+    SolarizedLight,
+    /// The built-in Solarized Dark variant.
+    SolarizedDark,
+    /// The built-in Gruvbox Light variant.
+    GruvboxLight,
+    /// The built-in Gruvbox Dark variant.
+    GruvboxDark,
+    /// The built-in Catppuccin Latte variant.
+    CatppuccinLatte,
+    /// The built-in Catppuccin Frappé variant.
+    CatppuccinFrappe,
+    /// The built-in Catppuccin Macchiato variant.
+    CatppuccinMacchiato,
+    /// The built-in Catppuccin Mocha variant.
+    CatppuccinMocha,
+    /// The built-in Tokyo Night variant.
+    TokyoNight,
+    /// The built-in Tokyo Night Storm variant.
+    TokyoNightStorm,
+    /// The built-in Tokyo Night Light variant.
+    TokyoNightLight,
+    /// The built-in Kanagawa Wave variant.
+    KanagawaWave,
+    /// The built-in Kanagawa Dragon variant.
+    KanagawaDragon,
+    /// The built-in Kanagawa Lotus variant.
+    KanagawaLotus,
+    /// The built-in Moonfly variant.
+    Moonfly,
+    /// The built-in Nightfly variant.
+    Nightfly,
+    /// The built-in Oxocarbon variant.
+    Oxocarbon,
+    /// A [`Theme`] that uses a [`Custom`] palette.
+    Custom(Arc<Custom>),
+}
+
+impl Theme {
+    /// A list with all the defined themes.
+    pub const ALL: &'static [Self] = &[
+        Self::Light,
+        Self::Dark,
+        Self::Dracula,
+        Self::Nord,
+        Self::SolarizedLight,
+        Self::SolarizedDark,
+        Self::GruvboxLight,
+        Self::GruvboxDark,
+        Self::CatppuccinLatte,
+        Self::CatppuccinFrappe,
+        Self::CatppuccinMacchiato,
+        Self::CatppuccinMocha,
+        Self::TokyoNight,
+        Self::TokyoNightStorm,
+        Self::TokyoNightLight,
+        Self::KanagawaWave,
+        Self::KanagawaDragon,
+        Self::KanagawaLotus,
+        Self::Moonfly,
+        Self::Nightfly,
+        Self::Oxocarbon,
+    ];
+
+    /// Creates a new custom [`Theme`] from the given [`Palette`].
+    pub fn custom(name: String, palette: Palette) -> Self {
+        Self::custom_with_fn(name, palette, palette::Extended::generate)
+    }
+
+    /// Creates a new custom [`Theme`] from the given [`Palette`], with
+    /// a custom generator of a [`palette::Extended`].
+    pub fn custom_with_fn(
+        name: String,
+        palette: Palette,
+        generate: impl FnOnce(Palette) -> palette::Extended,
+    ) -> Self {
+        Self::Custom(Arc::new(Custom::with_fn(name, palette, generate)))
+    }
+
+    /// Returns the [`Palette`] of the [`Theme`].
+    pub fn palette(&self) -> Palette {
+        match self {
+            Self::Light => Palette::LIGHT,
+            Self::Dark => Palette::DARK,
+            Self::Dracula => Palette::DRACULA,
+            Self::Nord => Palette::NORD,
+            Self::SolarizedLight => Palette::SOLARIZED_LIGHT,
+            Self::SolarizedDark => Palette::SOLARIZED_DARK,
+            Self::GruvboxLight => Palette::GRUVBOX_LIGHT,
+            Self::GruvboxDark => Palette::GRUVBOX_DARK,
+            Self::CatppuccinLatte => Palette::CATPPUCCIN_LATTE,
+            Self::CatppuccinFrappe => Palette::CATPPUCCIN_FRAPPE,
+            Self::CatppuccinMacchiato => Palette::CATPPUCCIN_MACCHIATO,
+            Self::CatppuccinMocha => Palette::CATPPUCCIN_MOCHA,
+            Self::TokyoNight => Palette::TOKYO_NIGHT,
+            Self::TokyoNightStorm => Palette::TOKYO_NIGHT_STORM,
+            Self::TokyoNightLight => Palette::TOKYO_NIGHT_LIGHT,
+            Self::KanagawaWave => Palette::KANAGAWA_WAVE,
+            Self::KanagawaDragon => Palette::KANAGAWA_DRAGON,
+            Self::KanagawaLotus => Palette::KANAGAWA_LOTUS,
+            Self::Moonfly => Palette::MOONFLY,
+            Self::Nightfly => Palette::NIGHTFLY,
+            Self::Oxocarbon => Palette::OXOCARBON,
+            Self::Custom(custom) => custom.palette,
+        }
+    }
+
+    /// Returns the [`palette::Extended`] of the [`Theme`].
+    pub fn extended_palette(&self) -> &palette::Extended {
+        match self {
+            Self::Light => &palette::EXTENDED_LIGHT,
+            Self::Dark => &palette::EXTENDED_DARK,
+            Self::Dracula => &palette::EXTENDED_DRACULA,
+            Self::Nord => &palette::EXTENDED_NORD,
+            Self::SolarizedLight => &palette::EXTENDED_SOLARIZED_LIGHT,
+            Self::SolarizedDark => &palette::EXTENDED_SOLARIZED_DARK,
+            Self::GruvboxLight => &palette::EXTENDED_GRUVBOX_LIGHT,
+            Self::GruvboxDark => &palette::EXTENDED_GRUVBOX_DARK,
+            Self::CatppuccinLatte => &palette::EXTENDED_CATPPUCCIN_LATTE,
+            Self::CatppuccinFrappe => &palette::EXTENDED_CATPPUCCIN_FRAPPE,
+            Self::CatppuccinMacchiato => {
+                &palette::EXTENDED_CATPPUCCIN_MACCHIATO
+            }
+            Self::CatppuccinMocha => &palette::EXTENDED_CATPPUCCIN_MOCHA,
+            Self::TokyoNight => &palette::EXTENDED_TOKYO_NIGHT,
+            Self::TokyoNightStorm => &palette::EXTENDED_TOKYO_NIGHT_STORM,
+            Self::TokyoNightLight => &palette::EXTENDED_TOKYO_NIGHT_LIGHT,
+            Self::KanagawaWave => &palette::EXTENDED_KANAGAWA_WAVE,
+            Self::KanagawaDragon => &palette::EXTENDED_KANAGAWA_DRAGON,
+            Self::KanagawaLotus => &palette::EXTENDED_KANAGAWA_LOTUS,
+            Self::Moonfly => &palette::EXTENDED_MOONFLY,
+            Self::Nightfly => &palette::EXTENDED_NIGHTFLY,
+            Self::Oxocarbon => &palette::EXTENDED_OXOCARBON,
+            Self::Custom(custom) => &custom.extended,
+        }
+    }
+}
+
+impl fmt::Display for Theme {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Light => write!(f, "Light"),
+            Self::Dark => write!(f, "Dark"),
+            Self::Dracula => write!(f, "Dracula"),
+            Self::Nord => write!(f, "Nord"),
+            Self::SolarizedLight => write!(f, "Solarized Light"),
+            Self::SolarizedDark => write!(f, "Solarized Dark"),
+            Self::GruvboxLight => write!(f, "Gruvbox Light"),
+            Self::GruvboxDark => write!(f, "Gruvbox Dark"),
+            Self::CatppuccinLatte => write!(f, "Catppuccin Latte"),
+            Self::CatppuccinFrappe => write!(f, "Catppuccin Frappé"),
+            Self::CatppuccinMacchiato => write!(f, "Catppuccin Macchiato"),
+            Self::CatppuccinMocha => write!(f, "Catppuccin Mocha"),
+            Self::TokyoNight => write!(f, "Tokyo Night"),
+            Self::TokyoNightStorm => write!(f, "Tokyo Night Storm"),
+            Self::TokyoNightLight => write!(f, "Tokyo Night Light"),
+            Self::KanagawaWave => write!(f, "Kanagawa Wave"),
+            Self::KanagawaDragon => write!(f, "Kanagawa Dragon"),
+            Self::KanagawaLotus => write!(f, "Kanagawa Lotus"),
+            Self::Moonfly => write!(f, "Moonfly"),
+            Self::Nightfly => write!(f, "Nightfly"),
+            Self::Oxocarbon => write!(f, "Oxocarbon"),
+            Self::Custom(custom) => custom.fmt(f),
+        }
+    }
+}
+
+/// A [`Theme`] with a customized [`Palette`].
+#[derive(Debug, Clone, PartialEq)]
+pub struct Custom {
+    name: String,
+    palette: Palette,
+    extended: palette::Extended,
+}
+
+impl Custom {
+    /// Creates a [`Custom`] theme from the given [`Palette`].
+    pub fn new(name: String, palette: Palette) -> Self {
+        Self::with_fn(name, palette, palette::Extended::generate)
+    }
+
+    /// Creates a [`Custom`] theme from the given [`Palette`] with
+    /// a custom generator of a [`palette::Extended`].
+    pub fn with_fn(
+        name: String,
+        palette: Palette,
+        generate: impl FnOnce(Palette) -> palette::Extended,
+    ) -> Self {
+        Self {
+            name,
+            palette,
+            extended: generate(palette),
+        }
+    }
+}
+
+impl fmt::Display for Custom {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.name)
+    }
+}
diff --git a/core/src/theme/palette.rs b/core/src/theme/palette.rs
new file mode 100644
index 00000000..985a54a8
--- /dev/null
+++ b/core/src/theme/palette.rs
@@ -0,0 +1,625 @@
+//! Define the colors of a theme.
+use crate::{color, Color};
+
+use once_cell::sync::Lazy;
+use palette::color_difference::Wcag21RelativeContrast;
+use palette::rgb::Rgb;
+use palette::{FromColor, Hsl, Mix};
+
+/// A color palette.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Palette {
+    /// The background [`Color`] of the [`Palette`].
+    pub background: Color,
+    /// The text [`Color`] of the [`Palette`].
+    pub text: Color,
+    /// The primary [`Color`] of the [`Palette`].
+    pub primary: Color,
+    /// The success [`Color`] of the [`Palette`].
+    pub success: Color,
+    /// The danger [`Color`] of the [`Palette`].
+    pub danger: Color,
+}
+
+impl Palette {
+    /// The built-in light variant of a [`Palette`].
+    pub const LIGHT: Self = Self {
+        background: Color::WHITE,
+        text: Color::BLACK,
+        primary: Color::from_rgb(
+            0x5E as f32 / 255.0,
+            0x7C as f32 / 255.0,
+            0xE2 as f32 / 255.0,
+        ),
+        success: Color::from_rgb(
+            0x12 as f32 / 255.0,
+            0x66 as f32 / 255.0,
+            0x4F as f32 / 255.0,
+        ),
+        danger: Color::from_rgb(
+            0xC3 as f32 / 255.0,
+            0x42 as f32 / 255.0,
+            0x3F as f32 / 255.0,
+        ),
+    };
+
+    /// The built-in dark variant of a [`Palette`].
+    pub const DARK: Self = Self {
+        background: Color::from_rgb(
+            0x20 as f32 / 255.0,
+            0x22 as f32 / 255.0,
+            0x25 as f32 / 255.0,
+        ),
+        text: Color::from_rgb(0.90, 0.90, 0.90),
+        primary: Color::from_rgb(
+            0x5E as f32 / 255.0,
+            0x7C as f32 / 255.0,
+            0xE2 as f32 / 255.0,
+        ),
+        success: Color::from_rgb(
+            0x12 as f32 / 255.0,
+            0x66 as f32 / 255.0,
+            0x4F as f32 / 255.0,
+        ),
+        danger: Color::from_rgb(
+            0xC3 as f32 / 255.0,
+            0x42 as f32 / 255.0,
+            0x3F as f32 / 255.0,
+        ),
+    };
+
+    /// The built-in [Dracula] variant of a [`Palette`].
+    ///
+    /// [Dracula]: https://draculatheme.com
+    pub const DRACULA: Self = Self {
+        background: color!(0x282A36), // BACKGROUND
+        text: color!(0xf8f8f2),       // FOREGROUND
+        primary: color!(0xbd93f9),    // PURPLE
+        success: color!(0x50fa7b),    // GREEN
+        danger: color!(0xff5555),     // RED
+    };
+
+    /// The built-in [Nord] variant of a [`Palette`].
+    ///
+    /// [Nord]: https://www.nordtheme.com/docs/colors-and-palettes
+    pub const NORD: Self = Self {
+        background: color!(0x2e3440), // nord0
+        text: color!(0xeceff4),       // nord6
+        primary: color!(0x8fbcbb),    // nord7
+        success: color!(0xa3be8c),    // nord14
+        danger: color!(0xbf616a),     // nord11
+    };
+
+    /// The built-in [Solarized] Light variant of a [`Palette`].
+    ///
+    /// [Solarized]: https://ethanschoonover.com/solarized
+    pub const SOLARIZED_LIGHT: Self = Self {
+        background: color!(0xfdf6e3), // base3
+        text: color!(0x657b83),       // base00
+        primary: color!(0x2aa198),    // cyan
+        success: color!(0x859900),    // green
+        danger: color!(0xdc322f),     // red
+    };
+
+    /// The built-in [Solarized] Dark variant of a [`Palette`].
+    ///
+    /// [Solarized]: https://ethanschoonover.com/solarized
+    pub const SOLARIZED_DARK: Self = Self {
+        background: color!(0x002b36), // base03
+        text: color!(0x839496),       // base0
+        primary: color!(0x2aa198),    // cyan
+        success: color!(0x859900),    // green
+        danger: color!(0xdc322f),     // red
+    };
+
+    /// The built-in [Gruvbox] Light variant of a [`Palette`].
+    ///
+    /// [Gruvbox]: https://github.com/morhetz/gruvbox
+    pub const GRUVBOX_LIGHT: Self = Self {
+        background: color!(0xfbf1c7), // light BG_0
+        text: color!(0x282828),       // light FG0_29
+        primary: color!(0x458588),    // light BLUE_4
+        success: color!(0x98971a),    // light GREEN_2
+        danger: color!(0xcc241d),     // light RED_1
+    };
+
+    /// The built-in [Gruvbox] Dark variant of a [`Palette`].
+    ///
+    /// [Gruvbox]: https://github.com/morhetz/gruvbox
+    pub const GRUVBOX_DARK: Self = Self {
+        background: color!(0x282828), // dark BG_0
+        text: color!(0xfbf1c7),       // dark FG0_29
+        primary: color!(0x458588),    // dark BLUE_4
+        success: color!(0x98971a),    // dark GREEN_2
+        danger: color!(0xcc241d),     // dark RED_1
+    };
+
+    /// The built-in [Catppuccin] Latte variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_LATTE: Self = Self {
+        background: color!(0xeff1f5), // Base
+        text: color!(0x4c4f69),       // Text
+        primary: color!(0x1e66f5),    // Blue
+        success: color!(0x40a02b),    // Green
+        danger: color!(0xd20f39),     // Red
+    };
+
+    /// The built-in [Catppuccin] Frappé variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_FRAPPE: Self = Self {
+        background: color!(0x303446), // Base
+        text: color!(0xc6d0f5),       // Text
+        primary: color!(0x8caaee),    // Blue
+        success: color!(0xa6d189),    // Green
+        danger: color!(0xe78284),     // Red
+    };
+
+    /// The built-in [Catppuccin] Macchiato variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_MACCHIATO: Self = Self {
+        background: color!(0x24273a), // Base
+        text: color!(0xcad3f5),       // Text
+        primary: color!(0x8aadf4),    // Blue
+        success: color!(0xa6da95),    // Green
+        danger: color!(0xed8796),     // Red
+    };
+
+    /// The built-in [Catppuccin] Mocha variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_MOCHA: Self = Self {
+        background: color!(0x1e1e2e), // Base
+        text: color!(0xcdd6f4),       // Text
+        primary: color!(0x89b4fa),    // Blue
+        success: color!(0xa6e3a1),    // Green
+        danger: color!(0xf38ba8),     // Red
+    };
+
+    /// The built-in [Tokyo Night] variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT: Self = Self {
+        background: color!(0x1a1b26), // Background (Night)
+        text: color!(0x9aa5ce),       // Text
+        primary: color!(0x2ac3de),    // Blue
+        success: color!(0x9ece6a),    // Green
+        danger: color!(0xf7768e),     // Red
+    };
+
+    /// The built-in [Tokyo Night] Storm variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT_STORM: Self = Self {
+        background: color!(0x24283b), // Background (Storm)
+        text: color!(0x9aa5ce),       // Text
+        primary: color!(0x2ac3de),    // Blue
+        success: color!(0x9ece6a),    // Green
+        danger: color!(0xf7768e),     // Red
+    };
+
+    /// The built-in [Tokyo Night] Light variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT_LIGHT: Self = Self {
+        background: color!(0xd5d6db), // Background
+        text: color!(0x565a6e),       // Text
+        primary: color!(0x166775),    // Blue
+        success: color!(0x485e30),    // Green
+        danger: color!(0x8c4351),     // Red
+    };
+
+    /// The built-in [Kanagawa] Wave variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_WAVE: Self = Self {
+        background: color!(0x363646), // Sumi Ink 3
+        text: color!(0xCD7BA),        // Fuji White
+        primary: color!(0x2D4F67),    // Wave Blue 2
+        success: color!(0x76946A),    // Autumn Green
+        danger: color!(0xC34043),     // Autumn Red
+    };
+
+    /// The built-in [Kanagawa] Dragon variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_DRAGON: Self = Self {
+        background: color!(0x181616), // Dragon Black 3
+        text: color!(0xc5c9c5),       // Dragon White
+        primary: color!(0x223249),    // Wave Blue 1
+        success: color!(0x8a9a7b),    // Dragon Green 2
+        danger: color!(0xc4746e),     // Dragon Red
+    };
+
+    /// The built-in [Kanagawa] Lotus variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_LOTUS: Self = Self {
+        background: color!(0xf2ecbc), // Lotus White 3
+        text: color!(0x545464),       // Lotus Ink 1
+        primary: color!(0xc9cbd1),    // Lotus Violet 3
+        success: color!(0x6f894e),    // Lotus Green
+        danger: color!(0xc84053),     // Lotus Red
+    };
+
+    /// The built-in [Moonfly] variant of a [`Palette`].
+    ///
+    /// [Moonfly]: https://github.com/bluz71/vim-moonfly-colors
+    pub const MOONFLY: Self = Self {
+        background: color!(0x080808), // Background
+        text: color!(0xbdbdbd),       // Foreground
+        primary: color!(0x80a0ff),    // Blue (normal)
+        success: color!(0x8cc85f),    // Green (normal)
+        danger: color!(0xff5454),     // Red (normal)
+    };
+
+    /// The built-in [Nightfly] variant of a [`Palette`].
+    ///
+    /// [Nightfly]: https://github.com/bluz71/vim-nightfly-colors
+    pub const NIGHTFLY: Self = Self {
+        background: color!(0x011627), // Background
+        text: color!(0xbdc1c6),       // Foreground
+        primary: color!(0x82aaff),    // Blue (normal)
+        success: color!(0xa1cd5e),    // Green (normal)
+        danger: color!(0xfc514e),     // Red (normal)
+    };
+
+    /// The built-in [Oxocarbon] variant of a [`Palette`].
+    ///
+    /// [Oxocarbon]: https://github.com/nyoom-engineering/oxocarbon.nvim
+    pub const OXOCARBON: Self = Self {
+        background: color!(0x232323),
+        text: color!(0xd0d0d0),
+        primary: color!(0x00b4ff),
+        success: color!(0x00c15a),
+        danger: color!(0xf62d0f),
+    };
+}
+
+/// An extended set of colors generated from a [`Palette`].
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Extended {
+    /// The set of background colors.
+    pub background: Background,
+    /// The set of primary colors.
+    pub primary: Primary,
+    /// The set of secondary colors.
+    pub secondary: Secondary,
+    /// The set of success colors.
+    pub success: Success,
+    /// The set of danger colors.
+    pub danger: Danger,
+    /// Whether the palette is dark or not.
+    pub is_dark: bool,
+}
+
+/// The built-in light variant of an [`Extended`] palette.
+pub static EXTENDED_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::LIGHT));
+
+/// The built-in dark variant of an [`Extended`] palette.
+pub static EXTENDED_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::DARK));
+
+/// The built-in Dracula variant of an [`Extended`] palette.
+pub static EXTENDED_DRACULA: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::DRACULA));
+
+/// The built-in Nord variant of an [`Extended`] palette.
+pub static EXTENDED_NORD: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::NORD));
+
+/// The built-in Solarized Light variant of an [`Extended`] palette.
+pub static EXTENDED_SOLARIZED_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::SOLARIZED_LIGHT));
+
+/// The built-in Solarized Dark variant of an [`Extended`] palette.
+pub static EXTENDED_SOLARIZED_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::SOLARIZED_DARK));
+
+/// The built-in Gruvbox Light variant of an [`Extended`] palette.
+pub static EXTENDED_GRUVBOX_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::GRUVBOX_LIGHT));
+
+/// The built-in Gruvbox Dark variant of an [`Extended`] palette.
+pub static EXTENDED_GRUVBOX_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::GRUVBOX_DARK));
+
+/// The built-in Catppuccin Latte variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_LATTE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_LATTE));
+
+/// The built-in Catppuccin Frappé variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_FRAPPE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_FRAPPE));
+
+/// The built-in Catppuccin Macchiato variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_MACCHIATO: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_MACCHIATO));
+
+/// The built-in Catppuccin Mocha variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_MOCHA: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_MOCHA));
+
+/// The built-in Tokyo Night variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT));
+
+/// The built-in Tokyo Night Storm variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT_STORM: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT_STORM));
+
+/// The built-in Tokyo Night variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT_LIGHT));
+
+/// The built-in Kanagawa Wave variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_WAVE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_WAVE));
+
+/// The built-in Kanagawa Dragon variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_DRAGON: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_DRAGON));
+
+/// The built-in Kanagawa Lotus variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_LOTUS: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_LOTUS));
+
+/// The built-in Moonfly variant of an [`Extended`] palette.
+pub static EXTENDED_MOONFLY: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::MOONFLY));
+
+/// The built-in Nightfly variant of an [`Extended`] palette.
+pub static EXTENDED_NIGHTFLY: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::NIGHTFLY));
+
+/// The built-in Oxocarbon variant of an [`Extended`] palette.
+pub static EXTENDED_OXOCARBON: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::OXOCARBON));
+
+impl Extended {
+    /// Generates an [`Extended`] palette from a simple [`Palette`].
+    pub fn generate(palette: Palette) -> Self {
+        Self {
+            background: Background::new(palette.background, palette.text),
+            primary: Primary::generate(
+                palette.primary,
+                palette.background,
+                palette.text,
+            ),
+            secondary: Secondary::generate(palette.background, palette.text),
+            success: Success::generate(
+                palette.success,
+                palette.background,
+                palette.text,
+            ),
+            danger: Danger::generate(
+                palette.danger,
+                palette.background,
+                palette.text,
+            ),
+            is_dark: is_dark(palette.background),
+        }
+    }
+}
+
+/// A pair of background and text colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Pair {
+    /// The background color.
+    pub color: Color,
+
+    /// The text color.
+    ///
+    /// It's guaranteed to be readable on top of the background [`color`].
+    ///
+    /// [`color`]: Self::color
+    pub text: Color,
+}
+
+impl Pair {
+    /// Creates a new [`Pair`] from a background [`Color`] and some text [`Color`].
+    pub fn new(color: Color, text: Color) -> Self {
+        Self {
+            color,
+            text: readable(color, text),
+        }
+    }
+}
+
+/// A set of background colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Background {
+    /// The base background color.
+    pub base: Pair,
+    /// A weaker version of the base background color.
+    pub weak: Pair,
+    /// A stronger version of the base background color.
+    pub strong: Pair,
+}
+
+impl Background {
+    /// Generates a set of [`Background`] colors from the base and text colors.
+    pub fn new(base: Color, text: Color) -> Self {
+        let weak = mix(base, text, 0.15);
+        let strong = mix(base, text, 0.40);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of primary colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Primary {
+    /// The base primary color.
+    pub base: Pair,
+    /// A weaker version of the base primary color.
+    pub weak: Pair,
+    /// A stronger version of the base primary color.
+    pub strong: Pair,
+}
+
+impl Primary {
+    /// Generates a set of [`Primary`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of secondary colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Secondary {
+    /// The base secondary color.
+    pub base: Pair,
+    /// A weaker version of the base secondary color.
+    pub weak: Pair,
+    /// A stronger version of the base secondary color.
+    pub strong: Pair,
+}
+
+impl Secondary {
+    /// Generates a set of [`Secondary`] colors from the base and text colors.
+    pub fn generate(base: Color, text: Color) -> Self {
+        let base = mix(base, text, 0.2);
+        let weak = mix(base, text, 0.1);
+        let strong = mix(base, text, 0.3);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of success colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Success {
+    /// The base success color.
+    pub base: Pair,
+    /// A weaker version of the base success color.
+    pub weak: Pair,
+    /// A stronger version of the base success color.
+    pub strong: Pair,
+}
+
+impl Success {
+    /// Generates a set of [`Success`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of danger colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Danger {
+    /// The base danger color.
+    pub base: Pair,
+    /// A weaker version of the base danger color.
+    pub weak: Pair,
+    /// A stronger version of the base danger color.
+    pub strong: Pair,
+}
+
+impl Danger {
+    /// Generates a set of [`Danger`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+fn darken(color: Color, amount: f32) -> Color {
+    let mut hsl = to_hsl(color);
+
+    hsl.lightness = if hsl.lightness - amount < 0.0 {
+        0.0
+    } else {
+        hsl.lightness - amount
+    };
+
+    from_hsl(hsl)
+}
+
+fn lighten(color: Color, amount: f32) -> Color {
+    let mut hsl = to_hsl(color);
+
+    hsl.lightness = if hsl.lightness + amount > 1.0 {
+        1.0
+    } else {
+        hsl.lightness + amount
+    };
+
+    from_hsl(hsl)
+}
+
+fn deviate(color: Color, amount: f32) -> Color {
+    if is_dark(color) {
+        lighten(color, amount)
+    } else {
+        darken(color, amount)
+    }
+}
+
+fn mix(a: Color, b: Color, factor: f32) -> Color {
+    let a_lin = Rgb::from(a).into_linear();
+    let b_lin = Rgb::from(b).into_linear();
+
+    let mixed = a_lin.mix(b_lin, factor);
+    Rgb::from_linear(mixed).into()
+}
+
+fn readable(background: Color, text: Color) -> Color {
+    if is_readable(background, text) {
+        text
+    } else if is_dark(background) {
+        Color::WHITE
+    } else {
+        Color::BLACK
+    }
+}
+
+fn is_dark(color: Color) -> bool {
+    to_hsl(color).lightness < 0.6
+}
+
+fn is_readable(a: Color, b: Color) -> bool {
+    let a_srgb = Rgb::from(a);
+    let b_srgb = Rgb::from(b);
+
+    a_srgb.has_enhanced_contrast_text(b_srgb)
+}
+
+fn to_hsl(color: Color) -> Hsl {
+    Hsl::from_color(Rgb::from(color))
+}
+
+fn from_hsl(hsl: Hsl) -> Color {
+    Rgb::from_color(hsl).into()
+}