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Update doc for theme module
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src/theme/mod.rs
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src/theme/mod.rs
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//! Handle colors and themes in the UI.
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//!
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//! # Color palette
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//! # Colors
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//!
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//! Characters can be printed in the terminal with a specific color.
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//! The [`Color`] enum represents the ways this can be set.
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//!
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//! [`Color`]: enum.Color.html
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//!
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//! # Palette
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//!
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//! To achieve a customizable, yet unified look, Cursive uses a configurable
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//! palette of colors to be used through the entire application.
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//!
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//! These colors are:
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//! The [`PaletteColor`] enum defines possible entries in this palette.
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//!
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//! * **`background`**: used to color the application background
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//! [`PaletteColor`]: enum.PaletteColor.html
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//!
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//! These entries are:
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//!
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//! * **`Background`**: used to color the application background
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//! (around views).
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//! Defaults to **blue**.
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//! * **`shadow`**: used to color shadow around views.
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//! * **`Shadow`**: used to color shadow around views.
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//! Defaults to **black**.
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//! * **`view`**: used to color the background for views.
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//! * **`View`**: used to color the background for views.
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//! Defaults to **white**.
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//! * **`primary`**: used to print primary text.
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//! * **`Primary`**: used to print primary text.
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//! Defaults to **black**.
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//! * **`secondary`**: used to print secondary text.
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//! * **`Secondary`**: used to print secondary text.
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//! Defaults to **blue**.
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//! * **`tertiary`**: used to print tertiary text.
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//! * **`Tertiary`**: used to print tertiary text.
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//! Defaults to **white**.
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//! * **`title_primary`**: used to print primary titles.
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//! * **`TitlePrimary`**: used to print primary titles.
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//! Defaults to **red**.
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//! * **`title_secondary`**: used to print secondary titles.
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//! * **`TitleSecondary`**: used to print secondary titles.
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//! Defaults to **yellow**.
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//! * **`highlight`**: used to highlight selected items.
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//! * **`Highlight`**: used to highlight selected items.
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//! Defaults to **red**.
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//! * **`highlight_inactive`**: used to highlight selected but inactive items.
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//! * **`HighlightInactive`**: used to highlight selected but inactive items.
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//! Defaults to **blue**.
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//!
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//! A [`Palette`] then maps each of these to an actual [`Color`].
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//!
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//! [`Palette`]: struct.Palette.html
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//! [`Color`]: enum.Color.html
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//!
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//! # Color Types
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//!
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//! When drawing views, color can be picked in two way:
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//!
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//! * An exact [`Color`] can be given directly
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//! * A [`PaletteColor`] entry can be given, which will fetch whatever color
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//! is currently defined for this.
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//!
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//! The [`ColorType`] enum abstract over these two choices.
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//!
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//! [`ColorType`]: enum.ColorType.html
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//!
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//! # Color Styles
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//!
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//! Each cell of the terminal uses two colors: *foreground* and *background*.
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//! To actually print anything, two colors must be picked: one for the
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//! foreground, and one for the background.
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//!
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//! Color styles are defined to easily refer to a pair of colors from the
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//! palette.
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//! As such, a [`ColorStyle`] is made of a pair of `ColorType`.
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//!
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//! * **`Background`**: style used to print the application background.
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//! * Its *background* color is `background`.
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//! Since some pairs are frequently used, `ColorStyle` defines some methods to
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//! create these usual values:
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//!
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//! * **`ColorStyle::background()`**: style used to print the application background.
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//! * Its *background* color is `Background`.
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//! * Its *foreground* color is unimportant as no characters are ever
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//! printed in the background.
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//! * **`Shadow`**: style used to print shadows behind views.
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//! * Its *background* color is `shadow`.
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//! * **`ColorStyle::shadow()`**: style used to print shadows behind views.
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//! * Its *background* color is `Shadow`.
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//! * Here again, the *foreground* color is unimportant.
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//! * **`Primary`**: style used to print primary text.
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//! * Its *background* color is `view`.
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//! * Its *foreground* color is `primary`.
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//! * **`Secondary`**: style used to print secondary text.
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//! * Its *background* color is `view`.
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//! * Its *foreground* color is `secondary`.
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//! * **`Tertiary`**: style used to print tertiary text.
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//! * Its *background* color is `view`.
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//! * Its *foreground* color is `tertiary`.
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//! * **`TitlePrimary`**: style used to print titles.
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//! * Its *background* color is `view`.
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//! * Its *foreground* color is `title_primary`.
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//! * **`TitleSecondary`**: style used to print secondary titles.
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//! * Its *background* color is `view`.
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//! * Its *foreground* color is `title_secondary`.
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//! * **`Highlight`**: style used to print selected items.
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//! * Its *background* color is `highlight`.
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//! * Its *foreground* color is `view`.
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//! * **`HighlightInactive`**: style used to print selected,
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//! * **`ColorStyle::primary()`**: style used to print primary text.
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//! * Its *background* color is `View`.
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//! * Its *foreground* color is `Primary`.
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//! * **`ColorStyle::secondary()`**: style used to print secondary text.
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//! * Its *background* color is `View`.
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//! * Its *foreground* color is `Secondary`.
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//! * **`ColorStyle::tertiary()`**: style used to print tertiary text.
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//! * Its *background* color is `View`.
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//! * Its *foreground* color is `Tertiary`.
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//! * **`ColorStyle::title_primary()`**: style used to print titles.
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//! * Its *background* color is `View`.
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//! * Its *foreground* color is `TitlePrimary`.
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//! * **`ColorStyle::title_secondary()`**: style used to print secondary titles.
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//! * Its *background* color is `View`.
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//! * Its *foreground* color is `TitleSecondary`.
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//! * **`ColorStyle::highlight()`**: style used to print selected items.
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//! * Its *background* color is `Highlight`.
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//! * Its *foreground* color is `View`.
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//! * **`ColorStyle::highlight_inactive()`**: style used to print selected,
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//! but inactive items.
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//! * Its *background* color is `highlight_inactive`.
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//! * Its *foreground* color is `view`.
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//! * Its *background* color is `HighlightInactive`.
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//! * Its *foreground* color is `View`.
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//!
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//! Using one of these pairs when styling your application helps give it a
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//! coherent look.
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//!
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//! [`ColorStyle`]: struct.ColorStyle.html
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//!
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//! # Effects
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//!
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//! On top of a color style, some effects can be applied on cells: `Reverse`,
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//! for instance, swaps the foreground and background colors of a cell.
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//!
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//! # Style
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//!
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//! Finally, a style combine a [`ColorType`] and a set of [`Effect`]s, to
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//! represent any way text should be printed on screen.
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//!
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//! # Themes
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//!
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//! A theme defines the color palette an application will use, as well as
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