Fix multiline GitHub admonitions

yardang/conf.py.j2

@@ -411,7 +411,9 @@ def run_convert_github_admonitions_to_rst(app, filename, lines):
                     break
             else:
                 # replace indent to match directive
-                if replacing and "> " in line:
+                if replacing and line == ">":
+                    line = ""
+                elif replacing and "> " in line:
                     line = line.replace("> ", "  ")
                 elif replacing:
                     # missing "> ", so stop replacing and terminate directive

yardang/tests/test_sphinx.py

@@ -1,3 +1,4 @@
+import importlib.util
 from pathlib import Path
 
 from yardang import __version__
@@ -22,3 +23,19 @@ def test_generated_configuration_enables_extension(tmp_path, monkeypatch):
         conf_content = (Path(conf_dir) / "conf.py").read_text()
 
     assert '"yardang.sphinx"' in conf_content
+
+
+def test_github_admonition_preserves_quoted_blank_lines(tmp_path, monkeypatch):
+    (tmp_path / "pyproject.toml").write_text('[project]\nname = "test-project"\nversion = "1.0.0"\n')
+    (tmp_path / "README.md").write_text("# Test Project\n")
+    monkeypatch.chdir(tmp_path)
+
+    with generate_docs_configuration() as conf_dir:
+        spec = importlib.util.spec_from_file_location("yardang_test_conf", Path(conf_dir) / "conf.py")
+        conf = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(conf)
+
+        lines = ["> [!NOTE]\n> First paragraph.\n>\n> Second paragraph."]
+        conf.run_convert_github_admonitions_to_rst(None, "index.md", lines)
+
+    assert lines == [":::{note}\n\n  First paragraph.\n\n  Second paragraph."]