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feat: support media query #42

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feat: support media query #42

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55 changes: 38 additions & 17 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,10 @@ export interface PresetThemeOptions<Theme extends Record<string, any>> {
* Multiple themes
*/
theme: Record<string, Theme>
/**
* Themes for different media queries
*/
mediaThemes?: Record<string, Theme>
/**
* The prefix of the generated css variables
* @default --un-preset-theme
Expand All @@ -38,8 +42,17 @@ interface ThemeValue {
name: string
}

const defaultBreakpoints = {
'sm': '640px',
'md': '768px',
'lg': '1024px',
'xl': '1280px',
'2xl': '1536px',

}

export function presetTheme<T extends Record<string, any>>(options: PresetThemeOptions<T>): Preset<T> {
const { prefix = '--un-preset-theme', theme } = options
const { prefix = '--un-preset-theme', theme, mediaThemes = {} } = options
const selectors: Selectors = { light: ':root', ...options.selectors }
if (!theme.light)
theme.light = {} as T
Expand Down Expand Up @@ -151,26 +164,34 @@ export function presetTheme<T extends Record<string, any>>(options: PresetThemeO
{
layer: 'theme',
async getCSS(context) {
const { css } = await context.generator.generate(
// Add Date.now() to avoid cache
keys.map(key => `${defaultThemeNames.includes(key) ? `${key}:` : ''}${PRESET_THEME_RULE}:${key}:${Date.now()}`),
{ preflights: false },
)
return css.split('\n').slice(1).map((line, index, lines) => {
const prevLine = index > 0 ? lines[index - 1] : ''
if (prevLine.includes('@media')) {
// convert .light{} to :root{}
line = line.replace(/.*?{/, ':root{')
}
else {
// convert .light .themename{} to .themename{}
line = line.replace(/\..*?\s(.*\{)/, '$1')
let cssOutput = ''
for (const key of keys) {
const { css } = await context.generator.generate(
`${defaultThemeNames.includes(key) ? `${key}:` : ''}${PRESET_THEME_RULE}:${key}:${Date.now()}`,
{ preflights: false },
)
const cssLines = css.split('\n').slice(1)
for (const mediaKey of Object.keys(mediaThemes)) {
const mediaCssLines = cssLines.map((line) => {
const prevLine = cssLines[cssLines.indexOf(line) - 1] || ''
if (prevLine.includes('@media')) {
// convert .light{} to :root{}
line = line.replace(/.*?{/, ':root{')
}
else {
// convert .light .themename{} to .themename{}
line = line.replace(/\..*?\s(.*\{)/, '$1')
}
return `@media (min-width: ${(defaultBreakpoints as any)[mediaKey]}) { ${line} }`
}).join('\n')
cssOutput += mediaCssLines
}
return line
}).join('\n')
}
return cssOutput
},
},
],

postprocess(util) {
util.entries.forEach(([, val]) => {
if (typeof val === 'string') {
Expand Down
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