BUG: missing plugin flake8 after upgrade from 3.0.0 to 3.2.0

Checklist

• Same issue occurs when reproducing the MWE below: new virtualenv, clean folder, minimal additional libs, etc.
• Same issue occurs when running without cache (eg by setting the env var FLAKEHEAVEN_CACHE_TIMEOUT=0)

Bug Description

if you change version from 3.0.0 to 3.x.0 it does not run; it complains about lacking of flake8 plugin

Expected behavior

it runs as before

Bug Repro

1. OS, arch 12.6, intel based
2. python --version Python 3.9.6
3. pyproject.toml (and / or all other config files that apply, eg .pylintrc, stc)

[tool.black]
line-length = 120
target-version = ['py37']
exclude = '''
/(
    \.git
  | \.github
  | \.mypy_cache
  | \.pytest_cache
  | \.idea
  | venv
  | venv_linter
  | venv_tests
  | \.local
  | makefile\.inc
  | build
  | dist
)/
'''

[tool.isort]
profile = 'black'
line_length = 120
skip_glob = [
    ".history",
    "venv",
    "venv_linter",
    "venv_tests",
]
use_parentheses = true
multi_line_output = 3
include_trailing_comma = true

[tool.flakeheaven]
exclude = [
    ".history",
    "venv",
    "venv_linter",
    "venv_tests",
]
format = "grouped"
max_line_length = 120
show_source = true
extended_default_ignore = []

[tool.flakeheaven.plugins]
# default plugins
pyflakes = ["+*"]
pycodestyle = ["+*"]
# additional plugins
flake8 = ["+*"]
# enable everything that starts from `flake8-`
"flake8-*" = ["+*"]
pylint = [
    "+*", # include everything
    "-C0114", # disable Missing module docstring (missing-module-docstring)
    "-C0116", # disable Missing function or method docstring  (missing-function-docstring)
    "-E0401", # disable Unable to import 'library' (import-error)
]

# match by prefix
[tool.flakeheaven.exceptions."dags/"]
pycodestyle = [
    "-W503" # disable line break before binary operator
]
pylint = [
    "-W0104" # disable statement seems to have no effect (pointless-statement)
]

1. pip freeze

astroid==2.12.12
black==22.8.0
click==8.1.3
colorama==0.4.6
dill==0.3.6
entrypoints==0.4
flake8==4.0.1
flakeheaven==3.2.0
isort==5.10.1
lazy-object-proxy==1.8.0
mccabe==0.6.1
mypy-extensions==0.4.3
pathspec==0.10.1
platformdirs==2.5.2
pycodestyle==2.8.0
pyflakes==2.4.0
Pygments==2.13.0
pylint==2.15.5
toml==0.10.2
tomli==2.0.1
tomlkit==0.11.6
typing_extensions==4.4.0
urllib3==1.26.12
wrapt==1.14.1

1. flakeheaven plugins
2. Contents of any additional files (eg sample .py file(s) to be linted)
3. Any additional env vars setup
4. [If available] contents of flakeheaven config -vvv

NAME        | VERSION  | CODES            | RULES
mccabe      | 0.6.1    | C90              | 
pycodestyle | 2.8.0    | E, W             | +*
pyflakes    | 2.4.0    | F                | +*
pylint      | 2.15.5   | C, E, F, I, R, W | +*, -C0114, -C0116, -E0401

Steps to reproduce the behavior:

1. run flakeheaven lint .
2. …

Additional context

[pwoolvett]

Not quite.

Flake8 is not a checker itself but instead a framework where plugins can register linting checks. By default, when you install flake8 those three mentioned plugins are installed.

So if you only install flake8, when you run flake8, it will internally call those three plugins and merge their reports.

When you install a package in your python environment, if that package registers itself as a flake8 plugin, its automatically added to the list of checks which are run each time you run flake8.

So if you install flake8 and additionally other flake8 plugins, when you run flake8, it will internally call all those plugins and merge their reports (I think a plugin can define itself as “disabled by default”, but that doesn’t concern this discussion…)

flakeheaven is just a flake8 wrapper for custom configuration etc. It inherits everything from flake8 and adds the config mentioned in the README. Worthy mention is the departure from automatically activating all plugins to only activate explicitly required plugins from the config.

So if you only install flakeheaven (which has flake8 as a dependency), when you run flakeheaven lint, it will internally call those three plugins and merge their reports, BUT ONLY REPORT THE ACTIVATED PLUGINS from the config.

• if you have no plugins section -> only pyflakes and pycodestyle are activated docs

• if your config is

...
[tool.flakeheaven.plugins]
mccabe = ["+*"]

then -> only mccabe is activated

• if your config is

...
[tool.flakeheaven.plugins]
pyflakes = ["+*"]
pycodestyle = ["+*"]
mccabe = ["+*"]

then -> only mccabe, pyflakes, and pycodestyle are activated

anything else you want to activate, you must (1) pip install it, (2) enable it explicitly or with a glob in the plugins section

[iamtodor]

@pwoolvett yeah, seems like I thought that by adding a plugin in a config file it will be automatically installed and activated. So basically, flakeheaven checks the code against the following:

• flake8
• PyFlakes
• pycodestyle
• McCabe

Right?