Blackify

.flake8

@@ -5,8 +5,12 @@
 #   https://pycodestyle.readthedocs.io/en/latest/intro.html#error-codes
 
 ignore =
+    # E203: whitespace before ':'
+    E203,
     # E402: module level imports at top of file
     E402,
+    # E501: line too long
+    E501,
     # W503: line break before binary operator
     W503,
     # W504: line break after binary operator

.pre-commit-config.yaml

@@ -0,0 +1,27 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: 'v3.2.0'
+    hooks:
+        # Prevent giant files from being committed.
+    -   id: check-added-large-files
+        # Check for files that contain merge conflict strings.
+    -   id: check-merge-conflict
+        # Check for debugger imports and py37+ `breakpoint()` calls in python source.
+    -   id: debug-statements
+        # Don't commit to master branch.
+    -   id: no-commit-to-branch
+-   repo: https://github.com/psf/black
+    rev: '19.10b0'
+    hooks:
+    -   id: black
+        # Force black to run on whole repo, using settings from pyproject.toml
+        pass_filenames: false
+        args: [--config=./pyproject.toml, .]
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: '3.8.3'
+    hooks:
+        # Run flake8.
+    -   id: flake8
+        args: [--config=./.flake8]

.travis.yml

@@ -60,7 +60,7 @@ install:
     conda install --quiet -n ${ENV_NAME} --file ${CONDA_REQS_FILE};
 
   # Conda-install our own additional dependencies.
-  - conda install --file conda_requirements.txt
+  - conda install --file requirements/conda_requirements.txt
 
   # Output environment debug info
   - >
@@ -90,4 +90,8 @@ install:
 
 script:
 
+  - >
+    echo $(black --version);
+    black --check $(INSTALL_DIR);
+
   - pytest -v ./iris_ugrid/tests

README.md

@@ -1,2 +1,9 @@
+<p align="center">
+<!-- https://shields.io/ is a good source of these -->
+<a href="https://github.com/psf/black">
+<img src="https://img.shields.io/badge/code%20style-black-000000.svg"
+     alt="black" /></a>
+</p>
+
 # iris-ugrid
 Unstructured mesh library for Iris

iris_ugrid/tests/test_install.py

@@ -14,7 +14,6 @@
 def test_iris_installation():
     # Check that iris cf loader includes 'exclude' functionality.
     # Import a ugrid-specific test, that ought to exist on the branch.
-    from iris.tests.unit.fileformats.cf.test_CFReader \
-        import Test_exclude_vars
+    from iris.tests.unit.fileformats.cf.test_CFReader import Test_exclude_vars
 
-    assert hasattr(Test_exclude_vars, 'test_exclude_vars')
+    assert hasattr(Test_exclude_vars, "test_exclude_vars")

pyproject.toml

@@ -0,0 +1,2 @@
+[tool.black]
+line-length = 79

conda_requirements.txt → requirements/conda_requirements.txt

@@ -1,2 +1,3 @@
+black=19.10b0
 gridded
 pytest