Configure pre-commit hooks and configure black for tests also.

These include flake8 linting, black and isort formatting
as well as some general hooks with minor checks.

* .pre-commit-config.yaml

* pyproject.toml : Run black on test files also.

.pre-commit-config.yaml

@@ -0,0 +1,81 @@
+# pre-commit is a useful tool which can be setup  by contributors
+# per-repository in a few simple steps given that the
+# repository has a config file like this one.
+#
+# The configured hooks are run on `git commit`. If one of the hooks makes or
+# demands a change of the commits contents the commit process is aborted.
+# The hooks can also be run manually through `pre-commit run --all-files`.
+
+minimum_pre_commit_version: "1.15"
+
+# The following hooks will be run before a commit is created
+repos:
+  # general stuff
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      # check file system problems
+      - id: check-case-conflict
+      - id: check-symlinks
+      - id: destroyed-symlinks
+
+      # unify whitespace and line ending
+      - id: trailing-whitespace
+        args: [--markdown-linebreak-ext=md]
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+
+      # sort requirements.txt files
+      - id: requirements-txt-fixer
+
+  # format python files
+  - repo: https://github.com/psf/black
+    rev: 22.6.0
+    hooks:
+      - id: black
+        files: ^(src/vorta/|tests)
+
+  # sort python imports
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+
+  # # run black on code embedded in docstrings
+  # - repo: https://github.com/asottile/blacken-docs
+  #   rev: v1.12.1
+  #   hooks:
+  #     - id: blacken-docs
+  #       additional_dependencies: [black]
+  #       args:
+  #         [
+  #           --line-length,
+  #           "120",
+  #           --skip-string-normalization,
+  #           --target-version,
+  #           py39,
+  #         ]
+
+  # check pep8 conformity using flake8
+  - repo: https://github.com/PyCQA/flake8
+    rev: 5.0.4
+    hooks:
+      - id: flake8
+
+# configuration for the pre-commit.ci bot
+# only relevant when actually using the bot
+ci:
+  autofix_commit_msg: |
+    [pre-commit.ci] auto fixes from pre-commit.com hooks
+
+    for more information, see https://pre-commit.ci and
+    the `.pre-commit-config.yaml` file in this repository.
+
+  autofix_prs: true # default
+  autoupdate_commit_msg: |
+    [pre-commit.ci] Autoupdate pre-commit hook versions.
+
+    for more information, see https://pre-commit.ci and
+    the `.pre-commit-config.yaml` file in this repository.
+
+  submodules: false # default

pyproject.toml

@@ -2,7 +2,7 @@
 line-length = 120
 skip-string-normalization = true
 target-version = ['py39']
-include = "src/vorta/.*.py$"
+include = "(src/vorta/|tests).*.py$"
 
 [tool.isort]
 profile = "black"