Enable pre-commit

.github/workflows/tox.yml

@@ -22,6 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - tox_env: lint
           - tox_env: py36
           - tox_env: py37
           - tox_env: py38

.pre-commit-config.yaml

@@ -0,0 +1,13 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks.git
+    rev: v3.2.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: mixed-line-ending
+      - id: check-byte-order-marker
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: debug-statements
+        language_version: python3

tests/ansicolor_eix.html

@@ -69,6 +69,7 @@
 
 <span class="ansi38-252 ansi40">Found 5 matches.</span>
 
+
 </pre>
 </body>
 

tests/ansicolor_eix.txt

@@ -31,4 +31,4 @@
 [1] "betagarden" /home/sping/__playground/betagarden
 
 Found 5 matches.
-
+

tox.ini

@@ -1,6 +1,7 @@
 [tox]
 minversion = 3.9.0
 envlist =
+    lint
     py{36,37,38,39}
     packaging
 
@@ -15,6 +16,16 @@ sitepackages = False
 commands =
     python -m unittest tests/test_ansi2html.py
 
+[testenv:lint]
+description = Runs all linting tasks
+commands =
+    # to run a single linter you can do "pre-commit run flake8"
+    python -m pre_commit run {posargs:--all}
+deps = pre-commit>=1.18.1
+extras =
+skip_install = true
+usedevelop = false
+
 [testenv:packaging]
 description =
     Do packaging/distribution. If tag is not present or PEP440 compliant upload to