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/**
* Theme loader - loads theme JSON files and applies them to the DOM.
*/
import type { DesktopTheme, ResolvedTheme } from "./types"
import { resolveThemeVariant, themeToCss } from "./resolve"
/** Currently active theme */
let activeTheme: DesktopTheme | null = null
const THEME_STYLE_ID = "opencode-theme"
function ensureLoaderStyleElement(): HTMLStyleElement {
const existing = document.getElementById(THEME_STYLE_ID) as HTMLStyleElement | null
if (existing) {
return existing
}
const element = document.createElement("style")
element.id = THEME_STYLE_ID
document.head.appendChild(element)
return element
}
/**
* Load and apply a theme to the document.
* Creates or updates a <style> element with the theme's CSS custom properties.
*
* @param theme - The desktop theme to apply
* @param themeId - Optional theme ID for the data-theme attribute
*/
export function applyTheme(theme: DesktopTheme, themeId?: string): void {
activeTheme = theme
// Resolve both variants
const lightTokens = resolveThemeVariant(theme.light, false)
const darkTokens = resolveThemeVariant(theme.dark, true)
const targetThemeId = themeId ?? theme.id
// Build the CSS
const css = buildThemeCss(lightTokens, darkTokens, targetThemeId)
const themeStyleElement = ensureLoaderStyleElement()
themeStyleElement.textContent = css
document.documentElement.setAttribute("data-theme", targetThemeId)
}
/**
* Build CSS string from resolved theme tokens
*/
function buildThemeCss(light: ResolvedTheme, dark: ResolvedTheme, themeId: string): string {
const isDefaultTheme = themeId === "oc-1"
// Static tokens that don't change between themes
const staticTokens = `
--font-family-sans: "Inter", "Inter Fallback";
--font-family-sans--font-feature-settings: "ss03" 1;
--font-family-mono: "IBM Plex Mono", "IBM Plex Mono Fallback";
--font-family-mono--font-feature-settings: "ss01" 1;
--font-size-small: 13px;
--font-size-base: 14px;
--font-size-large: 16px;
--font-size-x-large: 20px;
--font-weight-regular: 400;
--font-weight-medium: 500;
--line-height-large: 150%;
--line-height-x-large: 180%;
--line-height-2x-large: 200%;
--letter-spacing-normal: 0;
--letter-spacing-tight: -0.1599999964237213;
--letter-spacing-tightest: -0.3199999928474426;
--paragraph-spacing-base: 0;
--spacing: 0.25rem;
--breakpoint-sm: 40rem;
--breakpoint-md: 48rem;
--breakpoint-lg: 64rem;
--breakpoint-xl: 80rem;
--breakpoint-2xl: 96rem;
--container-3xs: 16rem;
--container-2xs: 18rem;
--container-xs: 20rem;
--container-sm: 24rem;
--container-md: 28rem;
--container-lg: 32rem;
--container-xl: 36rem;
--container-2xl: 42rem;
--container-3xl: 48rem;
--container-4xl: 56rem;
--container-5xl: 64rem;
--container-6xl: 72rem;
--container-7xl: 80rem;
--radius-xs: 0.125rem;
--radius-sm: 0.25rem;
--radius-md: 0.375rem;
--radius-lg: 0.5rem;
--radius-xl: 0.625rem;
--shadow-xs:
0 1px 2px -1px rgba(19, 16, 16, 0.04), 0 1px 2px 0 rgba(19, 16, 16, 0.06), 0 1px 3px 0 rgba(19, 16, 16, 0.08);
--shadow-md:
0 6px 8px -4px rgba(19, 16, 16, 0.12), 0 4px 3px -2px rgba(19, 16, 16, 0.12), 0 1px 2px -1px rgba(19, 16, 16, 0.12);
--shadow-xs-border:
0 0 0 1px var(--border-base, rgba(11, 6, 0, 0.2)), 0 1px 2px -1px rgba(19, 16, 16, 0.04),
0 1px 2px 0 rgba(19, 16, 16, 0.06), 0 1px 3px 0 rgba(19, 16, 16, 0.08);
--shadow-xs-border-base:
0 0 0 1px var(--border-weak-base, rgba(17, 0, 0, 0.12)), 0 1px 2px -1px rgba(19, 16, 16, 0.04),
0 1px 2px 0 rgba(19, 16, 16, 0.06), 0 1px 3px 0 rgba(19, 16, 16, 0.08);
--shadow-xs-border-select:
0 0 0 3px var(--border-weak-selected, rgba(1, 103, 255, 0.29)),
0 0 0 1px var(--border-selected, rgba(0, 74, 255, 0.99)), 0 1px 2px -1px rgba(19, 16, 16, 0.25),
0 1px 2px 0 rgba(19, 16, 16, 0.08), 0 1px 3px 0 rgba(19, 16, 16, 0.12);
--shadow-xs-border-focus:
0 0 0 1px var(--border-base, rgba(11, 6, 0, 0.2)), 0 1px 2px -1px rgba(19, 16, 16, 0.25),
0 1px 2px 0 rgba(19, 16, 16, 0.08), 0 1px 3px 0 rgba(19, 16, 16, 0.12), 0 0 0 2px var(--background-weak, #f1f0f0),
0 0 0 3px var(--border-selected, rgba(0, 74, 255, 0.99));`
const lightCss = themeToCss(light)
const darkCss = themeToCss(dark)
// For the default theme, we use :root directly
// For named themes, we use the [data-theme] selector
if (isDefaultTheme) {
return `
:root {
${staticTokens}
color-scheme: light;
--text-mix-blend-mode: multiply;
${lightCss}
@media (prefers-color-scheme: dark) {
color-scheme: dark;
--text-mix-blend-mode: plus-lighter;
${darkCss}
}
}
`
}
return `
html[data-theme="${themeId}"] {
${staticTokens}
color-scheme: light;
--text-mix-blend-mode: multiply;
${lightCss}
@media (prefers-color-scheme: dark) {
color-scheme: dark;
--text-mix-blend-mode: plus-lighter;
${darkCss}
}
}
`
}
/**
* Load a theme from a JSON file URL
*/
export async function loadThemeFromUrl(url: string): Promise<DesktopTheme> {
const response = await fetch(url)
if (!response.ok) {
throw new Error(`Failed to load theme from ${url}: ${response.statusText}`)
}
return response.json()
}
/**
* Get the currently active theme
*/
export function getActiveTheme(): DesktopTheme | null {
const activeId = document.documentElement.getAttribute("data-theme")
if (!activeId) {
return null
}
if (activeTheme?.id === activeId) {
return activeTheme
}
return null
}
/**
* Remove the current theme and clean up
*/
export function removeTheme(): void {
activeTheme = null
const existingElement = document.getElementById(THEME_STYLE_ID)
if (existingElement) {
existingElement.remove()
}
document.documentElement.removeAttribute("data-theme")
}
/**
* Force a specific color scheme (light/dark) regardless of system preference
*/
export function setColorScheme(scheme: "light" | "dark" | "auto"): void {
if (scheme === "auto") {
document.documentElement.style.removeProperty("color-scheme")
} else {
document.documentElement.style.setProperty("color-scheme", scheme)
}
}
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