fix(cli): allow Document Intelligence conversion from stdin

packages/markitdown/src/markitdown/__main__.py

@@ -210,8 +210,6 @@ def main():
                 "Document Intelligence Endpoint is required when using Document Intelligence. "
                 "Pass -e/--endpoint or set MARKITDOWN_DOCINTEL_ENDPOINT."
             )
-        elif args.filename is None:
-            _exit_with_error("Filename is required when using Document Intelligence.")
 
         markitdown = MarkItDown(
             enable_plugins=args.use_plugins, docintel_endpoint=args.endpoint

packages/markitdown/tests/test_cli_docintel.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3 -m pytest
+"""--use-docintel must keep the CLI's filename-optional stdin mode."""
+
+import io
+import sys
+from types import SimpleNamespace
+from unittest.mock import MagicMock, patch
+
+from markitdown.__main__ import main
+
+DOC_INTEL = "markitdown.converters._doc_intel_converter"
+
+
+def test_use_docintel_reads_from_stdin(monkeypatch, capsys) -> None:
+    pdf_bytes = b"%PDF-1.4 fake pdf"
+    monkeypatch.setattr(sys, "stdin", SimpleNamespace(buffer=io.BytesIO(pdf_bytes)))
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["markitdown", "--use-docintel", "-e", "https://fake-di", "-x", "pdf"],
+    )
+    monkeypatch.delenv("AZURE_API_KEY", raising=False)
+
+    client = MagicMock()
+    client.begin_analyze_document.return_value.result.return_value.content = (
+        "# Converted by Document Intelligence"
+    )
+    request = MagicMock()
+
+    with patch(f"{DOC_INTEL}._dependency_exc_info", None), patch(
+        f"{DOC_INTEL}.DocumentIntelligenceClient", return_value=client
+    ), patch(f"{DOC_INTEL}.DefaultAzureCredential"), patch(
+        f"{DOC_INTEL}.DocumentAnalysisFeature"
+    ), patch(
+        f"{DOC_INTEL}.AnalyzeDocumentRequest", request
+    ):
+        main()
+
+    # The bytes read from stdin are what gets sent to Document Intelligence
+    request.assert_called_once_with(bytes_source=pdf_bytes)
+    assert capsys.readouterr().out.strip() == "# Converted by Document Intelligence"