fix: frontmatter headline

If one wrote a frontmatter the incomplete ending dashes where interpreted as a headline and therefore the last line in the frontmatter was handled as the first heading of the document.

Signed-off-by: Philip Molares <philip.molares@udo.edu>

commons/src/frontmatter-extractor/extractor.spec.ts

@@ -96,4 +96,17 @@ describe('frontmatter extraction', () => {
       expect(extraction?.rawText).toEqual('multi\nline')
     })
   })
+
+  describe('is incomplete', () => {
+    it('if frontmatter is closed with one dash', () => {
+      const testNote = ['---', 'type: document', '-', 'content']
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction?.incomplete).toBeTruthy()
+    })
+    it('if frontmatter is closed with two dash', () => {
+      const testNote = ['---', 'type: document', '-', 'content']
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction?.incomplete).toBeTruthy()
+    })
+  })
 })

commons/src/frontmatter-extractor/extractor.ts

@@ -7,6 +7,7 @@ import type { FrontmatterExtractionResult } from './types.js'
 
 const FRONTMATTER_BEGIN_REGEX = /^-{3,}$/
 const FRONTMATTER_END_REGEX = /^(?:-{3,}|\.{3,})$/
+const FRONTMATTER_INCOMPLETE_END_REGEX = /^-{1,2}$/
 
 /**
  * Extracts a frontmatter block from a given multiline string.
@@ -25,13 +26,21 @@ export const extractFrontmatter = (
     return undefined
   }
   for (let i = 1; i < lines.length; i++) {
+    if (FRONTMATTER_INCOMPLETE_END_REGEX.test(lines[i])) {
+      return {
+        rawText: '',
+        lineOffset: i + 1,
+        incomplete: true
+      }
+    }
     if (
       lines[i].length === lines[0].length &&
       FRONTMATTER_END_REGEX.test(lines[i])
     ) {
       return {
         rawText: lines.slice(1, i).join('\n'),
-        lineOffset: i + 1
+        lineOffset: i + 1,
+        incomplete: false
       }
     }
   }

commons/src/frontmatter-extractor/types.ts

@@ -7,4 +7,5 @@
 export interface FrontmatterExtractionResult {
   rawText: string
   lineOffset: number
+  incomplete: boolean
 }