feat(core): make frontmatter available in markdown env

Author: meteorlxy

packages/@vuepress/core/src/page/createPage.ts

@@ -39,7 +39,12 @@ export const createPage = async (
   const frontmatter = resolvePageFrontmatter({ frontmatterRaw, options })
 
   // resolve excerpt from raw excerpt
-  const excerpt = resolvePageExcerpt({ excerptRaw, app, filePathRelative })
+  const excerpt = resolvePageExcerpt({
+    app,
+    excerptRaw,
+    filePathRelative,
+    frontmatter,
+  })
 
   // resolve slug from file path
   const slug = resolvePageSlug({ filePathRelative })
@@ -86,6 +91,7 @@ export const createPage = async (
     app,
     content,
     filePathRelative,
+    frontmatter,
     htmlFilePathRelative,
     key,
   })

packages/@vuepress/core/src/page/resolvePageComponentInfo.ts

@@ -4,20 +4,22 @@ import type {
   MarkdownLink,
 } from '@vuepress/markdown'
 import { path } from '@vuepress/utils'
-import type { App } from '../types'
+import type { App, PageFrontmatter } from '../types'
 
 /**
  * Resolve page component and related info
  */
 export const resolvePageComponentInfo = async ({
   app,
   content,
+  frontmatter,
   filePathRelative,
   htmlFilePathRelative,
   key,
 }: {
   app: App
   content: string
+  frontmatter: PageFrontmatter
   filePathRelative: string | null
   htmlFilePathRelative: string | null
   key: string
@@ -32,6 +34,7 @@ export const resolvePageComponentInfo = async ({
   const markdownEnv: MarkdownEnv = {
     base: app.options.base,
     filePathRelative,
+    frontmatter,
   }
 
   const rendered = app.markdown.render(content, markdownEnv)

packages/@vuepress/core/src/page/resolvePageExcerpt.ts

@@ -1,21 +1,24 @@
 import type { MarkdownEnv } from '@vuepress/markdown'
-import type { App } from '../types'
+import type { App, PageFrontmatter } from '../types'
 
 /**
  * Resolve page excerpt from raw excerpt
  */
 export const resolvePageExcerpt = ({
-  excerptRaw,
   app,
+  excerptRaw,
+  frontmatter,
   filePathRelative,
 }: {
-  excerptRaw: string
   app: App
+  excerptRaw: string
+  frontmatter: PageFrontmatter
   filePathRelative: string | null
 }): string => {
   const markdownEnv: MarkdownEnv = {
     base: app.options.base,
     filePathRelative,
+    frontmatter,
   }
   const html = app.markdown.render(excerptRaw, markdownEnv)
   return html

packages/@vuepress/markdown/src/types.ts

@@ -1,5 +1,5 @@
 import * as MarkdownIt from 'markdown-it'
-import type { PageHeader } from '@vuepress/shared'
+import type { PageFrontmatter, PageHeader } from '@vuepress/shared'
 import type {
   AnchorPluginOptions,
   AssetsPluginOptions,
@@ -61,6 +61,11 @@ export interface MarkdownEnv {
    */
   filePathRelative?: string | null
 
+  /**
+   * Frontmatter of the markdown file
+   */
+  frontmatter?: PageFrontmatter
+
   // Output
 
   /**