tui-nuances

Shared theming for ratatui widget libraries. Build one Theme, style every component of your app from it: tui-chart, tui-slider, tui-spinner, tui-rating, tui-piechart, tui-checkbox, tui-file-explorer and your own widgets.

gallery

Features

One Theme with ~30 named slots: UI (foreground, muted, border, border_focused, primary, selection_bg/fg …), status (success, warning, error, info) and data-viz (palette, bull, bear, axis, grid, crosshair, tooltip).
47 built-in themes (the 12 editor classics plus 31 ported from gitkraft): default, catppuccin-mocha, catppuccin-latte, dracula, nord, gruvbox, tokyo-night, solarized-dark, solarized-light, one-dark, rose-pine, monokai, default-light, grape, ocean, sunset, forest, rose, neon, gruvbox-light, catppuccin-frappe, catppuccin-macchiato, tokyo-night-storm, tokyo-night-light, kanagawa-wave, kanagawa-dragon, kanagawa-lotus, moonfly, nightfly, oxocarbon, cyberpunk, rose-pine-moon, rose-pine-dawn, ayu-mirage, everforest-dark, atom-one-light, night-owl, poimandres, flexoki-dark, flexoki-light, carbonfox, andromeda, synthwave, porsche, colorblind, high-contrast, mono. Every theme (except the terminal-native default/mono) passes WCAG AA for text.
Derive a theme from what you have: Theme::from_base(..), Theme::from_palette(..).
Semantic styles: style(), muted_style(), border_style(focused), title_style(), selected_style(), disabled_style(), status_style(Status).
Color math (tui_nuances::color): mix / lighten / darken, relative luminance, contrast ratio, readable_on, ensure_contrast, 256/16-color quantisation.
Terminal aware: ColorSupport::detect() (COLORTERM, TERM, NO_COLOR) and Theme::downgrade(support).
Glue traits: Themed (widgets) and ThemeProvider (your app theme type).
ThemeSwitcher for demos and settings screens.
Optional serde feature: themes load from flat JSON/TOML-style maps of color strings.

Installation

cargo add tui-nuances
# with serde support:
cargo add tui-nuances --features serde

or in Cargo.toml:

[dependencies]
tui-nuances = "0.1"
# with serde support:
# tui-nuances = { version = "0.1", features = ["serde"] }

Quick start

use ratatui::widgets::{Block, Borders, Paragraph};
use tui_nuances::{Status, Theme};

let theme = Theme::by_name("tokyo-night").unwrap_or_default();

let panel = Block::default()
    .borders(Borders::ALL)
    .border_style(theme.border_style(true))      // focused border
    .title_style(theme.title_style())
    .style(theme.style());                       // fg + bg
let status = Paragraph::new("deploy ok").style(theme.status_style(Status::Success));

Derive from your own colors

use ratatui::style::Color;
use tui_nuances::Theme;

let theme = Theme::from_base(
    "app",
    Some(Color::Rgb(16, 16, 24)),   // background
    Color::Rgb(230, 230, 240),      // foreground
    Color::Rgb(213, 0, 28),         // accent
    Color::Green,                   // bull / success
    Color::Red,                     // bear / error
)
.warning(Color::Yellow);            // every slot has a builder setter

Plug in your app's theme type

use tui_nuances::{Theme, ThemeProvider};

struct AppTheme { /* ... */ }
impl ThemeProvider for AppTheme {
    fn nuance_theme(&self) -> Theme { Theme::nord() }
}

Widget crates implement Themed { fn apply_theme(self, &Theme) -> Self }; then widget.themed(&app_theme) or widget.apply_theme(&theme) works everywhere.

Adapt to the terminal

use tui_nuances::Theme;

let theme = Theme::dracula().downgrade_for_terminal(); // honours NO_COLOR / COLORTERM / TERM

Examples

Example	Run	Demo
`gallery` – swatches of every theme, `t`/`T` cycle	`cargo run --example gallery`
`semantic` – mock UI using only semantic styles	`cargo run --example semantic`
`switcher` – `ThemeSwitcher` + color downgrade	`cargo run --example switcher`

Regenerate the GIFs with nu scripts/generate_all_tapes.nu (vhs required).

Migrating from `tui-chart`'s `Theme`

All chart fields keep their names (background, foreground, muted, axis, grid, border, title, palette, bull, bear, neutral, accent, crosshair, tooltip_fg, tooltip_bg) and the helpers base_style, axis_style, label_style, grid_style, fill, color(i), next/prev, all are available.

Development

just test-all   # cargo test --all-features + nushell script tests
just fuzz-build # needs nightly + cargo-fuzz

See CONTRIBUTING.md. Licensed under MIT.

tui-nuances 0.1.9