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update-css-vars.ts
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update-css-vars.ts
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import { promises as fs } from "fs"
import path from "path"
import { Config } from "@/src/utils/get-config"
import { highlighter } from "@/src/utils/highlighter"
import { registryItemCssVarsSchema } from "@/src/utils/registry/schema"
import { spinner } from "@/src/utils/spinner"
import postcss from "postcss"
import AtRule from "postcss/lib/at-rule"
import Root from "postcss/lib/root"
import Rule from "postcss/lib/rule"
import { z } from "zod"
export async function updateCssVars(
cssVars: z.infer<typeof registryItemCssVarsSchema> | undefined,
config: Config,
options: {
cleanupDefaultNextStyles?: boolean
silent?: boolean
}
) {
if (
!cssVars ||
!Object.keys(cssVars).length ||
!config.resolvedPaths.tailwindCss
) {
return
}
options = {
cleanupDefaultNextStyles: false,
silent: false,
...options,
}
const cssFilepath = config.resolvedPaths.tailwindCss
const cssFilepathRelative = path.relative(
config.resolvedPaths.cwd,
cssFilepath
)
const cssVarsSpinner = spinner(
`Updating ${highlighter.info(cssFilepathRelative)}`,
{
silent: options.silent,
}
).start()
const raw = await fs.readFile(cssFilepath, "utf8")
let output = await transformCssVars(raw, cssVars, config, {
cleanupDefaultNextStyles: options.cleanupDefaultNextStyles,
})
await fs.writeFile(cssFilepath, output, "utf8")
cssVarsSpinner.succeed()
}
export async function transformCssVars(
input: string,
cssVars: z.infer<typeof registryItemCssVarsSchema>,
config: Config,
options: {
cleanupDefaultNextStyles?: boolean
}
) {
options = {
cleanupDefaultNextStyles: false,
...options,
}
const plugins = [updateCssVarsPlugin(cssVars)]
if (options.cleanupDefaultNextStyles) {
plugins.push(cleanupDefaultNextStylesPlugin())
}
// Only add the base layer plugin if we're using css variables.
if (config.tailwind.cssVariables) {
plugins.push(updateBaseLayerPlugin())
}
const result = await postcss(plugins).process(input, {
from: undefined,
})
return result.css
}
function updateBaseLayerPlugin() {
return {
postcssPlugin: "update-base-layer",
Once(root: Root) {
const requiredRules = [
{ selector: "*", apply: "border-border" },
{ selector: "body", apply: "bg-background text-foreground" },
]
let baseLayer = root.nodes.find(
(node): node is AtRule =>
node.type === "atrule" &&
node.name === "layer" &&
node.params === "base" &&
requiredRules.every(({ selector, apply }) =>
node.nodes?.some(
(rule): rule is Rule =>
rule.type === "rule" &&
rule.selector === selector &&
rule.nodes.some(
(applyRule): applyRule is AtRule =>
applyRule.type === "atrule" &&
applyRule.name === "apply" &&
applyRule.params === apply
)
)
)
) as AtRule | undefined
if (!baseLayer) {
baseLayer = postcss.atRule({
name: "layer",
params: "base",
raws: { semicolon: true, between: " ", before: "\n" },
})
root.append(baseLayer)
}
requiredRules.forEach(({ selector, apply }) => {
const existingRule = baseLayer?.nodes?.find(
(node): node is Rule =>
node.type === "rule" && node.selector === selector
)
if (!existingRule) {
baseLayer?.append(
postcss.rule({
selector,
nodes: [
postcss.atRule({
name: "apply",
params: apply,
raws: { semicolon: true, before: "\n " },
}),
],
raws: { semicolon: true, between: " ", before: "\n " },
})
)
}
})
},
}
}
function updateCssVarsPlugin(
cssVars: z.infer<typeof registryItemCssVarsSchema>
) {
return {
postcssPlugin: "update-css-vars",
Once(root: Root) {
let baseLayer = root.nodes.find(
(node) =>
node.type === "atrule" &&
node.name === "layer" &&
node.params === "base"
) as AtRule | undefined
if (!(baseLayer instanceof AtRule)) {
baseLayer = postcss.atRule({
name: "layer",
params: "base",
nodes: [],
raws: {
semicolon: true,
before: "\n",
between: " ",
},
})
root.append(baseLayer)
}
if (baseLayer !== undefined) {
// Add variables for each key in cssVars
Object.entries(cssVars).forEach(([key, vars]) => {
const selector = key === "light" ? ":root" : `.${key}`
// TODO: Fix typecheck.
addOrUpdateVars(baseLayer as AtRule, selector, vars)
})
}
},
}
}
function cleanupDefaultNextStylesPlugin() {
return {
postcssPlugin: "cleanup-default-next-styles",
Once(root: Root) {
const bodyRule = root.nodes.find(
(node): node is Rule => node.type === "rule" && node.selector === "body"
)
if (bodyRule) {
// Remove color from the body node.
bodyRule.nodes
.find(
(node): node is postcss.Declaration =>
node.type === "decl" &&
node.prop === "color" &&
node.value === "rgb(var(--foreground-rgb))"
)
?.remove()
// Remove background: linear-gradient.
bodyRule.nodes
.find((node): node is postcss.Declaration => {
return (
node.type === "decl" &&
node.prop === "background" &&
// This is only going to run on create project, so all good.
node.value.startsWith("linear-gradient")
)
})
?.remove()
// If the body rule is empty, remove it.
if (bodyRule.nodes.length === 0) {
bodyRule.remove()
}
}
},
}
}
function addOrUpdateVars(
baseLayer: AtRule,
selector: string,
vars: Record<string, string>
) {
let ruleNode = baseLayer.nodes?.find(
(node): node is Rule => node.type === "rule" && node.selector === selector
)
if (!ruleNode) {
if (Object.keys(vars).length > 0) {
ruleNode = postcss.rule({
selector,
raws: { between: " ", before: "\n " },
})
baseLayer.append(ruleNode)
}
}
Object.entries(vars).forEach(([key, value]) => {
const prop = `--${key.replace(/^--/, "")}`
const newDecl = postcss.decl({
prop,
value,
raws: { semicolon: true },
})
const existingDecl = ruleNode?.nodes.find(
(node): node is postcss.Declaration =>
node.type === "decl" && node.prop === prop
)
existingDecl ? existingDecl.replaceWith(newDecl) : ruleNode?.append(newDecl)
})
}