From 5fada031b4d946f7d35d8ef5cf7640ad96ff5877 Mon Sep 17 00:00:00 2001
From: Felix Fontein <felix@fontein.de>
Date: Tue, 28 Oct 2025 06:18:58 +0100
Subject: [PATCH] Add ruff check to CI.

---
 antsibull-nox.toml |  2 ++
 ruff.toml          | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 ruff.toml

diff --git a/antsibull-nox.toml b/antsibull-nox.toml
index 36fd080e..9fb3f3ba 100644
--- a/antsibull-nox.toml
+++ b/antsibull-nox.toml
@@ -19,6 +19,8 @@ stable_branches = [ "stable-*" ]
 run_isort = true
 isort_config = ".isort.cfg"
 run_black = true
+run_ruff_check = true
+ruff_check_config = "ruff.toml"
 run_flake8 = true
 flake8_config = ".flake8"
 run_pylint = true
diff --git a/ruff.toml b/ruff.toml
new file mode 100644
index 00000000..dca70302
--- /dev/null
+++ b/ruff.toml
@@ -0,0 +1,31 @@
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: 2025 Felix Fontein <felix@fontein.de>
+
+line-length = 160
+
+[lint]
+# https://docs.astral.sh/ruff/rules/
+
+select = ["A", "B", "E", "F", "FA", "FLY", "UP", "SIM"]
+ignore = [
+    # Better keep ignored (for now)
+    "F811",  # Redefinition of unused `xxx` (happens a lot for fixtures in unit tests)
+    "E402",  # Module level import not at top of file
+    "E741",  # Ambiguous variable name
+    "UP012",  # unnecessary-encode-utf8
+    "UP015",  # Unnecessary mode argument
+    "SIM105",  # suppressible-exception
+    "SIM108",  # if-else-block-instead-of-if-exp
+    # To fix later:
+    "B905",  # zip-without-explicit-strict - needs Python 3.10+
+    # To fix:
+    "UP024",  # Replace aliased errors with `OSError`
+]
+
+# Allow fix for all enabled rules (when `--fix`) is provided.
+fixable = ["ALL"]
+unfixable = []
+
+# Allow unused variables when underscore-prefixed or starting with dummy
+dummy-variable-rgx = "^(_|dummy).*$"