Run flake8 via pre-commit

.pre-commit-config.yaml

@@ -1,6 +1,20 @@
 repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+    - id: debug-statements
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.6.2
+    rev: v2.7.2
     hooks:
     - id: pyupgrade
       args: [--py36-plus]
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.3
+    hooks:
+    - id: flake8
+      additional_dependencies:
+      - flake8-coding==1.3.2
+      - flake8-html==0.4.1
+      - flake8-deprecated==1.3
+      - flake8-todo==0.7
+      - mccabe==0.6.1

.travis.yml

@@ -3,7 +3,7 @@ language: python
 matrix:
     include:
         - python: "3.6"
-          env: TOXENV=lint
+          env: TOXENV=isort
           after_success:
         - python: "3.6"
           env: TOXENV=py36

tox.ini

@@ -6,7 +6,7 @@ envlist =
     py37,
     py38,
     py39,
-    lint,
+    isort,
     pre-commit,
     coverage-report
 
@@ -66,37 +66,16 @@ commands =
     autopep8 --verbose --in-place --recursive --aggressive --aggressive {toxinidir}/src setup.py
     docformatter --in-place --recursive {toxinidir}/src setup.py
 
-[testenv:lint]
+[testenv:isort]
 basepython = python3.6
 skip_install = true
 
 deps =
     -cconstraints.txt
     isort <5
-    flake8
-    # helper to generate HTML reports:
-    flake8-html
-    # Useful flake8 plugins that are Python and Plone specific:
-    flake8-coding
-    flake8-debugger
-    flake8-deprecated
-    flake8-todo
-    flake8-isort
-    mccabe
-    # Potential flake8 plugins that should be used:  # TBD
-    #flake8-blind-except
-    #flake8-commas
-    #flake8-docstrings
-    #flake8-mypy
-    #flake8-pep3101
-    #flake8-plone-hasattr
-    #flake8-string-format
-    #flake8_strict
-    #flake8-quotes
 
 commands =
     - isort --check-only --recursive --diff {toxinidir}/src setup.py
-    flake8 src docs setup.py
 
 [testenv:pre-commit]
 basepython = python3.6