fix(valid-heading-anchor): collapse repeated spaces in normalized heading anchors (#24)

Author: NoiseFan

src/rules/valid-heading-anchor/index.test.ts

@@ -66,6 +66,12 @@ const invalid: InvalidTestCase[] = [
     output: '# 中文标题 {#foo_bar123}',
     errors: [{ messageId: 'invalidHeadingAnchor' }],
   },
+  {
+    description: 'should collapse multiple spaces in anchor fix',
+    code: '# 中文标题 {#Chinese   Title}',
+    output: '# 中文标题 {#chinese-title}',
+    errors: [{ messageId: 'missingAnchor' }],
+  },
 ]
 
 run({

src/utils/anchor.ts

@@ -61,7 +61,7 @@ export function hasChinese(str: string): boolean {
  */
 export function normalizeAnchor(anchor: string): string {
   const lowerCaseAnchor = anchor.toLowerCase()
-  const completeHyphen = lowerCaseAnchor.replace(/[\s.]/g, '-')
+  const completeHyphen = lowerCaseAnchor.replace(/[\s.]+/g, '-')
   const keepLegalCharacters = completeHyphen.replace(/[^a-z0-9_-]/g, '')
   return keepLegalCharacters.replace(/^-+|-+$/g, '')
 }

tests/utils/anchor.test.ts

@@ -85,6 +85,11 @@ describe('normalizeAnchor', () => {
     expect(normalizeAnchor('中文-title')).toBe('title')
   })
 
+  it('should collapse repeated spaces into a single hyphen', () => {
+    expect(normalizeAnchor('Your  first test')).toBe('your-first-test')
+    expect(normalizeAnchor('Your   first    test')).toBe('your-first-test')
+  })
+
   it('should preserve digits and hyphens', () => {
     expect(normalizeAnchor('intro-2')).toBe('intro-2')
     expect(normalizeAnchor('API-Reference_v2')).toBe('api-reference_v2')