feat(markdown): flag that the excerpt is a copy of the body

docs/content/3.guide/1.writing/2.markdown.md

@@ -87,6 +87,8 @@ Full amount of content beyond the more divider.
 
 Description property will contain the excerpt content unless defined within the Front Matter props.
 
+If there is no `<!--more-->` divider in the text then excerpt is a copy of full content. And boolean variable `excerptIsBody` will be added into the document next to `excerpt`.
+
 Example variables will be injected into the document:
 
 ```json

src/runtime/markdown-parser/index.ts

@@ -67,7 +67,12 @@ export async function parse (file: string, userOptions: Partial<MarkdownOptions>
     toc = generateToc(body, tocOption)
   }
 
-  const excerptString = useExcerpt(content)
+  let excerptIsBody = undefined;
+  let excerptString = useExcerpt(content)
+  if (!excerptString) {
+    excerptString = content;
+    excerptIsBody = true;
+  }
   const excerpt = excerptString
     ? await generateBody(excerptString, { ...options, data })
     : undefined
@@ -86,6 +91,7 @@ export async function parse (file: string, userOptions: Partial<MarkdownOptions>
       _empty: content.trim().length === 0,
       title: heading.title,
       description: heading.description,
+      excerptIsBody,
       excerpt,
       ...data
     }
@@ -105,5 +111,5 @@ function useExcerpt (content: string, delimiter = /<!--\s*?more\s*?-->/i) {
   if (idx !== -1) {
     return content.slice(0, idx)
   }
-  return content
+  return null;
 }

src/runtime/types.d.ts

@@ -129,6 +129,10 @@ export interface MarkdownParsedContent extends ParsedContent {
    * Content excerpt, generated from content
    */
   excerpt?: MarkdownRoot
+  /**
+   * Content excerpt equals content
+   */
+  excerptIsBody?: Boolean
   /**
    * Parsed Markdown body with included table of contents.
    */

test/features/parser-markdown-excerpt.ts

@@ -57,5 +57,43 @@ export const testMarkdownParserExcerpt = () => {
         }
       `)
     })
+
+    test('When no <!--more--> then excerpt = content', async () => {
+      const parsed = await $fetch('/api/parse', {
+        method: 'POST',
+        body: {
+          id: 'content:index.md',
+          content: [
+            '# Index',
+            'First paragraph',
+            '',
+            'Second paragraph'
+          ].join('\n')
+        }
+      })
+
+      expect(parsed).toHaveProperty('body')
+      expect(parsed).toHaveProperty('excerpt')
+      expect(parsed.excerpt).toBeDefined()
+      expect(parsed.excerpt.children).toEqual(parsed.body.children)
+    })
+
+    test('Keep info that excerpt equals body', async () => {
+      const parsed = await $fetch('/api/parse', {
+        method: 'POST',
+        body: {
+          id: 'content:index.md',
+          content: [
+            '# Index',
+            'First paragraph',
+            '',
+            'Second paragraph'
+          ].join('\n')
+        }
+      })
+
+      expect(parsed).toHaveProperty('excerptIsBody')
+      expect(parsed.excerptIsBody).toBe(true)
+    })
   })
 }