perf: improve prepare output

plugins/plugin-blog-data/src/node/prepareBlogData.ts

@@ -1,3 +1,4 @@
+import { createHash } from 'node:crypto'
 import type { App, Page } from 'vuepress/core'
 import { colors, logger } from 'vuepress/utils'
 import type { BlogPostData, BlogPostDataItem } from '../shared/index.js'
@@ -20,11 +21,8 @@ if (import.meta.hot) {
 
 const headingRe = /<h(\d)[^>]*>.*?<\/h\1>/gi
 
-function getTimestamp(time: Date): number {
-  return new Date(time).getTime()
-}
-
 const EXCERPT_SPLIT = '<!-- more -->'
+let contentHash: string | undefined
 
 export async function preparedBlogData(app: App, pageFilter: (id: string) => boolean, options: PluginOption): Promise<void> {
   const start = performance.now()
@@ -84,8 +82,20 @@ export const blogPostData = JSON.parse(${JSON.stringify(
   if (app.env.isDev)
     content += HMR_CODE
 
-  await app.writeTemp('internal/blogData.js', content)
+  const currentHash = hash(content)
+  if (!contentHash || contentHash !== currentHash) {
+    contentHash = currentHash
+    await app.writeTemp('internal/blogData.js', content)
+  }
 
   if (app.env.isDebug)
     logger.info(`\n[${colors.green('@vuepress-plume/plugin-blog-data')}] prepare blog data time spent: ${(performance.now() - start).toFixed(2)}ms`)
 }
+
+function getTimestamp(time: Date): number {
+  return new Date(time).getTime()
+}
+
+function hash(content: string): string {
+  return createHash('md5').update(content).digest('hex')
+}

plugins/plugin-notes-data/src/node/prepareNotesData.ts

@@ -9,7 +9,7 @@ import type {
   NotesSidebar,
   NotesSidebarItem,
 } from '../shared/index.js'
-import { ensureArray, normalizePath } from './utils.js'
+import { ensureArray, hash, normalizePath } from './utils.js'
 
 const HMR_CODE = `
 if (import.meta.webpackHot) {
@@ -65,6 +65,7 @@ function resolvedNotesData(app: App, options: NotesDataOptions, result: NotesDat
   })
 }
 
+let contentHash: string | undefined
 export async function prepareNotesData(app: App, options: NotesDataOptions | NotesDataOptions[]) {
   const start = performance.now()
   const notesData: NotesData = {}
@@ -78,7 +79,11 @@ export const notesData = ${JSON.stringify(notesData, null, 2)}
   if (app.env.isDev)
     content += HMR_CODE
 
-  await app.writeTemp('internal/notesData.js', content)
+  const currentHash = hash(content)
+  if (!contentHash || contentHash !== currentHash) {
+    contentHash = currentHash
+    await app.writeTemp('internal/notesData.js', content)
+  }
 
   if (app.env.isDebug) {
     logger.info(

plugins/plugin-notes-data/src/node/utils.ts

@@ -1,3 +1,5 @@
+import { createHash } from 'node:crypto'
+
 export function ensureArray<T>(thing: T | T[] | null | undefined): T[] {
   if (Array.isArray(thing))
     return thing
@@ -13,3 +15,7 @@ export function normalizePath(str: string) {
 export function wait(time: number) {
   return new Promise(resolve => setTimeout(resolve, time))
 }
+
+export function hash(content: string): string {
+  return createHash('md5').update(content).digest('hex')
+}

theme/src/node/prepare/index.ts

@@ -1,6 +1,6 @@
 import type { App } from 'vuepress'
 import { watch } from 'chokidar'
-import { prepareArticleTagColors } from './prepareArticleTagColor.js'
+import { prepareArticleTagColors, updateArticleTagColor } from './prepareArticleTagColor.js'
 
 export async function setupPrepare(app: App): Promise<void> {
   await prepareArticleTagColors(app)
@@ -12,9 +12,9 @@ export function watchPrepare(app: App, watchers: any[]): void {
     ignoreInitial: true,
   })
 
-  watcher.on('change', () => prepareArticleTagColors(app))
-  watcher.on('add', () => prepareArticleTagColors(app))
-  watcher.on('unlink', () => prepareArticleTagColors(app))
+  watcher.on('change', () => updateArticleTagColor(app))
+  watcher.on('add', () => updateArticleTagColor(app))
+  watcher.on('unlink', () => updateArticleTagColor(app))
 
   watchers.push(watcher)
 }

theme/src/node/prepare/prepareArticleTagColor.ts

@@ -1,6 +1,7 @@
 import { toArray } from '@pengzhanbo/utils'
 import type { App } from 'vuepress'
-import { nanoid } from '../utils.js'
+import { fs } from 'vuepress/utils'
+import { hash, nanoid } from '../utils.js'
 
 export type TagsColorsItem = readonly [
   string, // normal color
@@ -8,6 +9,9 @@ export type TagsColorsItem = readonly [
   string, // background color
 ]
 
+const TEMP_JS = 'internal/articleTagColors.js'
+const TEMP_CSS = 'internal/articleTagColors.css'
+
 export const PRESET: TagsColorsItem[] = [
   ['#6aa1b7', '#5086a1', 'rgba(131, 208, 218, 0.314)'],
   ['#299764', '#18794e', 'rgba(16, 185, 129, 0.14)'],
@@ -46,8 +50,45 @@ if (import.meta.hot) {
 
 // { index: className }
 const cache: Record<number, string> = {}
+const hashMap: {
+  js: string
+  css: string
+} = { js: '', css: '' }
 
 export async function prepareArticleTagColors(app: App): Promise<void> {
+  const [tempJS, tempCSS] = await Promise.all([
+    readFile(app.dir.temp(TEMP_JS)),
+    readFile(app.dir.temp(TEMP_CSS)),
+  ])
+
+  if (tempJS) {
+    hashMap.js = hash(tempJS)
+  }
+
+  if (tempCSS) {
+    hashMap.css = hash(tempCSS)
+  }
+
+  await updateArticleTagColor(app)
+}
+
+export async function updateArticleTagColor(app: App): Promise<void> {
+  const { js, css } = genCode(app)
+
+  const cssHash = hash(css)
+  if (!css || hashMap.css !== cssHash) {
+    hashMap.css = cssHash
+    await app.writeTemp(TEMP_CSS, css)
+  }
+
+  const jsHash = hash(js)
+  if (hashMap.js !== jsHash) {
+    hashMap.js = jsHash
+    await app.writeTemp(TEMP_JS, js)
+  }
+}
+
+export function genCode(app: App): { js: string, css: string } {
   const articleTagColors: Record<string, string> = {}
   const tagList = new Set<string>()
 
@@ -70,16 +111,16 @@ export async function prepareArticleTagColors(app: App): Promise<void> {
     }
   })
 
-  let code = `\
+  let js = `\
 import './articleTagColors.css'
 export const articleTagColors = ${JSON.stringify(articleTagColors)}
 `
   if (app.env.isDev) {
-    code += HMR_CODE
+    js += HMR_CODE
   }
+  const css = genCSS()
 
-  await app.writeTemp('internal/articleTagColors.css', genTagColorsStyle())
-  await app.writeTemp('internal/articleTagColors.ts', code)
+  return { js, css }
 }
 
 function getTagCode(tag: string): number {
@@ -91,7 +132,7 @@ function getTagCode(tag: string): number {
   return code % PRESET.length
 }
 
-function genTagColorsStyle(): string {
+function genCSS(): string {
   let css = ''
 
   for (const [code, className] of Object.entries(cache)) {
@@ -109,3 +150,11 @@ function genTagColorsStyle(): string {
 
   return css
 }
+
+async function readFile(filepath: string): Promise<string> {
+  try {
+    return await fs.readFile(filepath, 'utf-8')
+  }
+  catch {}
+  return ''
+}

theme/src/node/utils.ts

@@ -1,4 +1,5 @@
 import process from 'node:process'
+import { createHash } from 'node:crypto'
 import { customAlphabet } from 'nanoid'
 import { fs, getDirname, path } from 'vuepress/utils'
 import { Logger, ensureEndingSlash, ensureLeadingSlash } from '@vuepress/helper'
@@ -12,6 +13,8 @@ export const templates = (url: string) => resolve('../templates', url)
 
 export const nanoid = customAlphabet('0123456789abcdefghijklmnopqrstuvwxyz', 8)
 
+export const hash = (content: string) => createHash('md5').update(content).digest('hex')
+
 export const logger = new Logger(THEME_NAME)
 
 export function getPackage() {