fix(#74): headings are not picked up after a one-line code snippet

src/markdownHeaders.test.ts

@@ -0,0 +1,52 @@
+/* eslint-disable no-undef */
+import markdownHeaders from './markdownHeaders';
+
+test('get markdown headers with backticks', () => {
+  const headersWithBackticks = markdownHeaders(`# heading 1
+\`plaintext
+\`\`\`one line 3ticks\`\`\`
+
+plaintext
+
+# heading 1
+plaintext
+\`inline one-tick\`
+\`\`\`one line 3ticks\`\`\`
+
+# heading 1
+
+\`\`\`bash
+# heading 1
+\`\`\`
+
+# heading 1
+
+\`\`\`\`\`\`
+# heading 1
+\`\`\`\`\`\`
+
+# heading 1
+
+\`\`\`
+# heading 1
+\`\`\`\`\`\`
+
+# heading 1
+
+\`\`\`\`\`\`
+# heading 1
+\`\`\`
+
+# heading 1
+
+plaintext`);
+
+  expect(headersWithBackticks.length).toBe(7);
+  expect(headersWithBackticks[0].lineno).toBe(0);
+  expect(headersWithBackticks[1].lineno).toBe(6);
+  expect(headersWithBackticks[2].lineno).toBe(11);
+  expect(headersWithBackticks[3].lineno).toBe(17);
+  expect(headersWithBackticks[4].lineno).toBe(23);
+  expect(headersWithBackticks[5].lineno).toBe(29);
+  expect(headersWithBackticks[6].lineno).toBe(35);
+});

src/markdownHeaders.ts

@@ -5,9 +5,11 @@ const markdownit = require('markdown-it')({ html: true });
 
 function isHeader(line: string, context: any) {
   // check code block
-  if (line.match(/(?:```)/)) {
-    context.flagBlock = !context.flagBlock;
-    return false;
+  if (!line.match(/(?:```)(?:.+?)(?:```)/)) {
+    if (line.match(/(?:```)/)) {
+      context.flagBlock = !context.flagBlock;
+      return false;
+    }
   }
   // check comment block
   if (line.match(/(?:<!--)/) && !line.match(/(?:-->)/)) {