Add configuration option

tests/test_integration.py

@@ -1,6 +1,8 @@
 """Integration tests for sphinx-llms-txt."""
 
+import sys
 from pathlib import Path
+from sphinx.testing.util import _clean_up_global_state
 
 
 def test_build_html_with_llms_txt(basic_sphinx_app):
@@ -68,3 +70,37 @@ def test_custom_filename(temp_dir, rootdir):
     # Safe unlink that works with older Python versions
     if hasattr(app, "docutils_conf_path") and app.docutils_conf_path.exists():
         app.docutils_conf_path.unlink()
+
+
+def test_max_lines_limit(temp_dir, rootdir):
+    """Test that the max lines limit works correctly."""
+    from sphinx.testing.util import SphinxTestApp
+
+    src_dir = rootdir / "basic"
+
+    # Create a new test app with a small line limit
+    app = SphinxTestApp(
+        srcdir=src_dir,
+        builddir=temp_dir,
+        buildername="html",
+        freshenv=True,
+        confoverrides={
+            "llms_txt_filename": "limited.txt",
+            "llms_txt_max_lines": 10,  # Set a small limit to trigger the warning
+            "llms_txt_verbose": True,
+        },
+    )
+
+    app.build()
+
+    # Check that the output file was NOT created (since it would exceed the limit)
+    output_file = Path(app.outdir) / "limited.txt"
+    assert not output_file.exists(), f"Output file {output_file} exists but should not when limit is exceeded"
+
+    # Custom cleanup to avoid missing_ok issue
+    sys.path[:] = app._saved_path
+    _clean_up_global_state()
+
+    # Safe unlink
+    if hasattr(app, "docutils_conf_path") and app.docutils_conf_path.exists():
+        app.docutils_conf_path.unlink()