Don't attempt inline plots in the Windows console

changelog.md

@@ -6,6 +6,7 @@ Features
 * Subcommand completions for the `/dsn` command.
 * Allow file target of `$>` redirection to be quoted.
 * Display of inline plots returned from `.|` operations.
+* Don't attempt inline plots in the Windows console.
 
 
 Bug Fixes

mycli/compat.py

@@ -1,5 +1,27 @@
 """Platform and Python version compatibility support."""
 
+from importlib import import_module
 import sys
 
 WIN: bool = sys.platform in ("win32", "cygwin")
+
+
+def _is_win32() -> bool:
+    return sys.platform == 'win32'
+
+
+def is_windows_console(output: object | None) -> bool:
+    """Return whether output uses a native Windows console backend."""
+    if not _is_win32() or output is None:
+        return False
+
+    output_types = tuple(
+        getattr(import_module(module_name), class_name)
+        for module_name, class_name in (
+            ('prompt_toolkit.output.conemu', 'ConEmuOutput'),
+            ('prompt_toolkit.output.win32', 'Win32Output'),
+            ('prompt_toolkit.output.windows10', 'Windows10_Output'),
+        )
+    )
+
+    return isinstance(output, output_types)

mycli/output.py

@@ -29,7 +29,7 @@
 from pygments.style import Style as PygmentsStyle
 from pymysql.cursors import Cursor
 
-from mycli.compat import WIN
+from mycli.compat import WIN, is_windows_console
 from mycli.constants import DEFAULT_HEIGHT, DEFAULT_WIDTH
 import mycli.main_modes.repl as repl_mode
 from mycli.packages import special
@@ -116,7 +116,8 @@ def output(
         is_warnings_style: bool = False,
     ) -> None:
         """Output text to stdout or a pager command."""
-        if result.image is not None:
+        prompt_output = self.prompt_session.output if self.prompt_session is not None else None
+        if result.image is not None and not is_windows_console(prompt_output):
             if result.image_protocol == 'iterm2':
                 click.secho('')
                 self.output_iterm2_image(result.image)

test/pytests/test_output.py

@@ -2,7 +2,8 @@
 
 import itertools
 import shutil
-from types import SimpleNamespace
+import sys
+from types import ModuleType, SimpleNamespace
 from typing import Any, cast
 
 import click
@@ -11,9 +12,11 @@
 from prompt_toolkit.formatted_text import ANSI, FormattedText, to_plain_text
 import pytest
 
+from mycli import compat
 from mycli import output as output_module
 from mycli.output import OutputMixin
 from mycli.packages.sqlresult import SQLResult
+from mycli.types import ImageProtocol
 from test.utils import DummyFormatter, FakeCursorBase, make_bare_mycli  # type: ignore[attr-defined]
 
 
@@ -112,6 +115,59 @@ def test_output_emits_kitty_image_in_base64_chunks(monkeypatch: pytest.MonkeyPat
     ]
 
 
+@pytest.mark.parametrize('image_protocol', ['iterm2', 'kitty'])
+def test_output_suppresses_images_in_windows_console(
+    monkeypatch: pytest.MonkeyPatch,
+    image_protocol: ImageProtocol,
+) -> None:
+    cli = make_bare_mycli()
+    cli.prompt_session = cast(
+        Any,
+        SimpleNamespace(output=SimpleNamespace(get_size=lambda: SimpleNamespace(columns=80, rows=24))),
+    )
+    cli.get_output_margin = lambda status=None: 1  # type: ignore[assignment]
+    emitted: list[str | None] = []
+    monkeypatch.setattr(output_module, 'is_windows_console', lambda output: True)
+    monkeypatch.setattr(click, 'echo', lambda value=None, **_kwargs: emitted.append(value))
+
+    OutputMixin.output(cli, itertools.chain(), SQLResult(image=b'png', image_protocol=image_protocol))
+
+    assert emitted == []
+
+
+def test_is_windows_console_detects_prompt_toolkit_backends(monkeypatch: pytest.MonkeyPatch) -> None:
+    class FakeWin32Output:
+        pass
+
+    class FakeWindows10Output:
+        pass
+
+    class FakeConEmuOutput:
+        pass
+
+    modules = (
+        ('prompt_toolkit.output.win32', 'Win32Output', FakeWin32Output),
+        ('prompt_toolkit.output.windows10', 'Windows10_Output', FakeWindows10Output),
+        ('prompt_toolkit.output.conemu', 'ConEmuOutput', FakeConEmuOutput),
+    )
+    for module_name, class_name, output_class in modules:
+        module = ModuleType(module_name)
+        setattr(module, class_name, output_class)
+        monkeypatch.setitem(sys.modules, module_name, module)
+    monkeypatch.setattr(compat.sys, 'platform', 'win32')
+
+    assert compat.is_windows_console(FakeWin32Output())
+    assert compat.is_windows_console(FakeWindows10Output())
+    assert compat.is_windows_console(FakeConEmuOutput())
+    assert not compat.is_windows_console(object())
+
+
+def test_is_windows_console_ignores_non_windows_platform(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(compat.sys, 'platform', 'cygwin')
+
+    assert not compat.is_windows_console(object())
+
+
 def test_get_output_margin_renders_prompt_once_and_counts_status_lines(monkeypatch: pytest.MonkeyPatch) -> None:
     cli = make_bare_mycli()
     cli.prompt_lines = 0