Fix color output logic

[studyingegret]

Fixes #18746

Implements @hepcat72's ideas.

• --color-output: Enable color regardless of the environment
• --no-color-output: Disable color regardless of the environment
• --color-output=auto or flags not given: Detect the environment to decide (note: currently enables color if stdout.isatty() and stderr.isatty()*)
• MYPY_FORCE_COLOR: When enabled (see docs/source/command_line.rst), enable colored output regardless of --color-output and --no-color-output
• However, all of the above falls to no color if mypy.util.FancyFormatter.detect_terminal_colors cannot detect a terminal color scheme

--color-output=auto is my addition. Also MYPY_FORCE_COLOR is previously undocumented(?), so I documented it.

* Not my addition, it's pre-existing code

Tested python runtests.py self pytest-fast. I added a test mypy/test/test_color_output.py but don't know how to run it.

[studyingegret]

Considering the breakage in mypy's tests & primer due to color output changes, I'd like opinions about if a "color legacy mode" (use old color behavior) is required, or if that feels redundant

Note: mypy_primer hardcodes MYPY_FORCE_COLOR

[studyingegret]

I plan to test the failing run in my fork repo, and clean up the changes made for it afterwards

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

git-revise (https://github.com/mystor/git-revise)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

beartype (https://github.com/beartype/beartype)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

bidict (https://github.com/jab/bidict)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

spack (https://github.com/spack/spack)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mypy_primer (https://github.com/hauntsaninja/mypy_primer)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

attrs (https://github.com/python-attrs/attrs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mypy-protobuf (https://github.com/dropbox/mypy-protobuf)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

bandersnatch (https://github.com/pypa/bandersnatch)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

cibuildwheel (https://github.com/pypa/cibuildwheel)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

typeshed-stats (https://github.com/AlexWaygood/typeshed-stats)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pydantic (https://github.com/pydantic/pydantic)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

PyGithub (https://github.com/PyGithub/PyGithub)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

optuna (https://github.com/optuna/optuna)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

check-jsonschema (https://github.com/python-jsonschema/check-jsonschema)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mkosi (https://github.com/systemd/mkosi)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

psycopg (https://github.com/psycopg/psycopg)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

tornado (https://github.com/tornadoweb/tornado)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pylox (https://github.com/sco1/pylox)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

spark (https://github.com/apache/spark)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

ppb-vector (https://github.com/ppb/ppb-vector)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

hydpy (https://github.com/hydpy-dev/hydpy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

prefect (https://github.com/PrefectHQ/prefect)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

aiohttp (https://github.com/aio-libs/aiohttp)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

colour (https://github.com/colour-science/colour)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

dacite (https://github.com/konradhalas/dacite)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

python-chess (https://github.com/niklasf/python-chess)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyinstrument (https://github.com/joerick/pyinstrument)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

anyio (https://github.com/agronholm/anyio)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

parso (https://github.com/davidhalter/parso)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

flake8-pyi (https://github.com/PyCQA/flake8-pyi)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

operator (https://github.com/canonical/operator)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

schemathesis (https://github.com/schemathesis/schemathesis)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

meson (https://github.com/mesonbuild/meson)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

sockeye (https://github.com/awslabs/sockeye)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

paasta (https://github.com/yelp/paasta)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

altair (https://github.com/vega/altair)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

xarray-dataclasses (https://github.com/astropenguin/xarray-dataclasses)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

core (https://github.com/home-assistant/core)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

strawberry (https://github.com/strawberry-graphql/strawberry)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

zulip (https://github.com/zulip/zulip)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

build (https://github.com/pypa/build)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

Tanjun (https://github.com/FasterSpeeding/Tanjun)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

starlette (https://github.com/encode/starlette)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

flake8 (https://github.com/pycqa/flake8)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

scrapy (https://github.com/scrapy/scrapy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

graphql-core (https://github.com/graphql-python/graphql-core)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

cki-lib (https://gitlab.com/cki-project/cki-lib)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

speedrun.com_global_scoreboard_webapp (https://github.com/Avasam/speedrun.com_global_scoreboard_webapp)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mypy (https://github.com/python/mypy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

janus (https://github.com/aio-libs/janus)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

python-sop (https://gitlab.com/dkg/python-sop)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pegen (https://github.com/we-like-parsers/pegen)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

nionutils (https://github.com/nion-software/nionutils)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

DateType (https://github.com/glyph/DateType)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyjwt (https://github.com/jpadilla/pyjwt)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

downforeveryone (https://github.com/rpdelaney/downforeveryone)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

asynq (https://github.com/quora/asynq)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

comtypes (https://github.com/enthought/comtypes)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

imagehash (https://github.com/JohannesBuchner/imagehash)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

rich (https://github.com/Textualize/rich)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

urllib3 (https://github.com/urllib3/urllib3)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

aiortc (https://github.com/aiortc/aiortc)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

hydra-zen (https://github.com/mit-ll-responsible-ai/hydra-zen)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

sphinx (https://github.com/sphinx-doc/sphinx)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

setuptools (https://github.com/pypa/setuptools)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pytest (https://github.com/pytest-dev/pytest)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

rclip (https://github.com/yurijmikhalevich/rclip)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

alectryon (https://github.com/cpitclaudel/alectryon)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

porcupine (https://github.com/Akuli/porcupine)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

sympy (https://github.com/sympy/sympy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pandas (https://github.com/pandas-dev/pandas)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

steam.py (https://github.com/Gobot1234/steam.py)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

django-stubs (https://github.com/typeddjango/django-stubs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

svcs (https://github.com/hynek/svcs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

more-itertools (https://github.com/more-itertools/more-itertools)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pytest-robotframework (https://github.com/detachhead/pytest-robotframework)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

aioredis (https://github.com/aio-libs/aioredis)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

CPython (Argument Clinic) (https://github.com/python/cpython)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pybind11 (https://github.com/pybind/pybind11)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyproject-metadata (https://github.com/pypa/pyproject-metadata)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

koda-validate (https://github.com/keithasaurus/koda-validate)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

dulwich (https://github.com/dulwich/dulwich)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

CPython (peg_generator) (https://github.com/python/cpython)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

werkzeug (https://github.com/pallets/werkzeug)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pycryptodome (https://github.com/Legrandin/pycryptodome)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

SinbadCogs (https://github.com/mikeshardmind/SinbadCogs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

black (https://github.com/psf/black)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

arviz (https://github.com/arviz-devs/arviz)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

trio (https://github.com/python-trio/trio)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyodide (https://github.com/pyodide/pyodide)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

Expression (https://github.com/cognitedata/Expression)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

discord.py (https://github.com/Rapptz/discord.py)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

jax (https://github.com/google/jax)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

aiohttp-devtools (https://github.com/aio-libs/aiohttp-devtools)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

scipy (https://github.com/scipy/scipy)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

alerta (https://github.com/alerta/alerta)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pylint (https://github.com/pycqa/pylint)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

ibis (https://github.com/ibis-project/ibis)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pandas-stubs (https://github.com/pandas-dev/pandas-stubs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

CPython (cases_generator) (https://github.com/python/cpython)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

com2ann (https://github.com/ilevkivskyi/com2ann)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

packaging (https://github.com/pypa/packaging)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyp (https://github.com/hauntsaninja/pyp)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

kornia (https://github.com/kornia/kornia)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

dedupe (https://github.com/dedupeio/dedupe)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

websockets (https://github.com/aaugustin/websockets)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

kopf (https://github.com/nolar/kopf)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

stone (https://github.com/dropbox/stone)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

manticore (https://github.com/trailofbits/manticore)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

archinstall (https://github.com/archlinux/archinstall)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pywin32 (https://github.com/mhammond/pywin32)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

jinja (https://github.com/pallets/jinja)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

scikit-learn (https://github.com/scikit-learn/scikit-learn)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

zope.interface (https://github.com/zopefoundation/zope.interface)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

mkdocs (https://github.com/mkdocs/mkdocs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

apprise (https://github.com/caronc/apprise)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

PyWinCtl (https://github.com/Kalmat/PyWinCtl)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

scipy-stubs (https://github.com/scipy/scipy-stubs)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pwndbg (https://github.com/pwndbg/pwndbg)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pandera (https://github.com/pandera-dev/pandera)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

yarl (https://github.com/aio-libs/yarl)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

httpx-caching (https://github.com/johtso/httpx-caching)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

poetry (https://github.com/python-poetry/poetry)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

materialize (https://github.com/MaterializeInc/materialize)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

paroxython (https://github.com/laowantong/paroxython)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

zipp (https://github.com/jaraco/zipp)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

async-utils (https://github.com/mikeshardmind/async-utils)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pip (https://github.com/pypa/pip)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

ignite (https://github.com/pytorch/ignite)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

openlibrary (https://github.com/internetarchive/openlibrary)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

rotki (https://github.com/rotki/rotki)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

nox (https://github.com/wntrblm/nox)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

cloud-init (https://github.com/canonical/cloud-init)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

schema_salad (https://github.com/common-workflow-language/schema_salad)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

itsdangerous (https://github.com/pallets/itsdangerous)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

isort (https://github.com/pycqa/isort)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

antidote (https://github.com/Finistere/antidote)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

pyppeteer (https://github.com/pyppeteer/pyppeteer)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

static-frame (https://github.com/static-frame/static-frame)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

freqtrade (https://github.com/freqtrade/freqtrade)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

python-htmlgen (https://github.com/srittau/python-htmlgen)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

dragonchain (https://github.com/dragonchain/dragonchain)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

boostedblob (https://github.com/hauntsaninja/boostedblob)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

artigraph (https://github.com/artigraph/artigraph)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

xarray (https://github.com/pydata/xarray)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

scikit-build-core (https://github.com/scikit-build/scikit-build-core)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

bokeh (https://github.com/bokeh/bokeh)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

twine (https://github.com/pypa/twine)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

AutoSplit (https://github.com/Toufool/AutoSplit)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

cwltool (https://github.com/common-workflow-language/cwltool)
+ warning: failed to detect a suitable terminal color scheme but colored output is requested
+ warning: failed to detect a suitable terminal color scheme but colored output is requested

[studyingegret]

This PR is now ready for review.

[cdce8p]

Haven't had the time to check it but how do these options interact with FORCE_COLOR / NO_COLOR env vars from Python itself? https://docs.python.org/3.13/using/cmdline.html#controlling-color

[studyingegret]

@cdce8p FORCE_COLOR is used as a fallback of MYPY_FORCE_COLOR when it isn't set (in which case it is treated in the same way as MYPY_FORCE_COLOR). It's legacy logic.
NO_COLOR is not checked.

[ilevkivskyi]

LOL, are you serious?

[ilevkivskyi]

The fact that few people don't like how it works now is not a reason to make breaking changes.

[studyingegret]

@ilevkivskyi Just for your opinion, what do you think about requiring an option to use the color output behavior in this PR? (or maybe adding --color-output=force will be enough to address the use case in #18746)

[ilevkivskyi]

@studyingegret FWIW I think the best option would be to simply improve the documentation (including flag help in argparse, it should specifically say about being auto by default and mention MYPY_FORCE_COLOR).