Fix automatic generation of changelog entries with markdown backticks

Co-authored-by: saulshanabrook <[email protected]>

Author: Copilot

.github/workflows/update-changelog.yml

@@ -31,7 +31,7 @@ jobs:
         run: |
           python modify_changelog.py update_changelog \
             "${{ github.event.pull_request.number }}" \
-            "${{ github.event.pull_request.title }}"
+            '${{ github.event.pull_request.title }}'
       
       - name: Check for changes
         id: changes

python/tests/test_modify_changelog.py

@@ -295,3 +295,102 @@ def test_custom_changelog_path():
         # Check changelog was updated
         updated_changelog = custom_changelog_path.read_text()
         assert "- Add new feature [#456](https://github.com/egraphs-good/egglog-python/pull/456)" in updated_changelog
+
+
+def test_update_changelog_with_markdown_backticks():
+    """Test that PR titles with markdown backticks are preserved correctly."""
+    with tempfile.TemporaryDirectory() as temp_dir:
+        temp_path = Path(temp_dir)
+
+        # Create mock changelog
+        changelog_content = """# Changelog
+
+## UNRELEASED
+
+## 1.2.3 (2024-01-01)
+
+- Some old change
+"""
+        docs_dir = temp_path / "docs"
+        docs_dir.mkdir()
+        changelog_path = docs_dir / "changelog.md"
+        changelog_path.write_text(changelog_content)
+
+        # Test with title containing markdown backticks
+        pr_title_with_backticks = "Support methods like `__array_function__` on expressions"
+
+        # Run the script
+        result = subprocess.run(
+            [
+                sys.executable,
+                str(Path(__file__).parent.parent.parent / "modify_changelog.py"),
+                "update_changelog",
+                "315",
+                pr_title_with_backticks,
+            ],
+            capture_output=True,
+            text=True,
+            cwd=temp_path,
+            check=False,
+        )
+
+        assert result.returncode == 0
+        assert f"Added changelog entry for PR #315: {pr_title_with_backticks}" in result.stdout
+
+        # Check that backticks are preserved in the changelog
+        updated_changelog = changelog_path.read_text()
+        expected_entry = f"- {pr_title_with_backticks} [#315](https://github.com/egraphs-good/egglog-python/pull/315)"
+        assert expected_entry in updated_changelog
+        
+        # Specifically check that the backticks around __array_function__ are preserved
+        assert "`__array_function__`" in updated_changelog
+
+
+def test_update_changelog_multiple_backticks():
+    """Test that PR titles with multiple markdown elements are preserved correctly."""
+    with tempfile.TemporaryDirectory() as temp_dir:
+        temp_path = Path(temp_dir)
+
+        # Create mock changelog
+        changelog_content = """# Changelog
+
+## UNRELEASED
+
+## 1.2.3 (2024-01-01)
+
+- Some old change
+"""
+        docs_dir = temp_path / "docs"
+        docs_dir.mkdir()
+        changelog_path = docs_dir / "changelog.md"
+        changelog_path.write_text(changelog_content)
+
+        # Test with title containing multiple markdown elements
+        pr_title_complex = "Fix `__getattr__` and add support for `__setitem__` methods"
+
+        # Run the script
+        result = subprocess.run(
+            [
+                sys.executable,
+                str(Path(__file__).parent.parent.parent / "modify_changelog.py"),
+                "update_changelog",
+                "999",
+                pr_title_complex,
+            ],
+            capture_output=True,
+            text=True,
+            cwd=temp_path,
+            check=False,
+        )
+
+        assert result.returncode == 0
+        assert f"Added changelog entry for PR #999: {pr_title_complex}" in result.stdout
+
+        # Check that all backticks are preserved in the changelog
+        updated_changelog = changelog_path.read_text()
+        expected_entry = f"- {pr_title_complex} [#999](https://github.com/egraphs-good/egglog-python/pull/999)"
+        assert expected_entry in updated_changelog
+        
+        # Specifically check that both sets of backticks are preserved
+        assert "`__getattr__`" in updated_changelog
+        assert "`__setitem__`" in updated_changelog