Add black-doc to pre-commit

.git-blame-ignore-revs

@@ -1,3 +1,6 @@
 # enforce unified code style with black
 28914fc2236cd5850f536b151d0ef383855d8519
 db0691cfb6b033e55664ffba25deb456a386a48c
+
+# enforce unified code style in our documentation with blackdoc
+a26a52d037a265774be0ca06bb141e3346e73ad0

.pre-commit-config.yaml

@@ -4,6 +4,13 @@ repos:
   hooks:
   - id: black
 
+- repo: https://github.com/keewis/blackdoc
+  rev: v0.3.8
+  hooks:
+  - id: blackdoc
+    files: '\.py$'
+    exclude: pyvista/plotting/charts.py
+
 - repo: https://github.com/pycqa/isort
   rev: 5.12.0
   hooks:

pyproject.toml

@@ -116,6 +116,13 @@ skip-string-normalization = true
 target-version = ['py39']
 exclude='\.eggs|\.git|\.mypy_cache|\.tox|\.venv|_build|buck-out|build|dist|node_modules'
 
+[tool.blackdoc]
+# From https://numpydoc.readthedocs.io/en/latest/format.html
+# Extended discussion: https://github.com/pyvista/pyvista/pull/4129
+# The length of docstring lines should be kept to 75 characters to facilitate
+# reading the docstrings in text terminals.
+line-length = 75
+
 [tool.build_sphinx]
 source-dir = 'doc'
 build-dir  = './doc/_build'

pyvista/examples/downloads.py

@@ -4676,7 +4676,9 @@ def download_fea_hertzian_contact_cylinder(load=True):  # pragma: no cover
     >>> import pyvista as pv
     >>> from pyvista import examples
     >>> grid = examples.download_fea_hertzian_contact_cylinder()
-    >>> grid.plot(scalars='PartID', cmap=['green', 'blue'], show_scalar_bar=False)
+    >>> grid.plot(
+    ...     scalars='PartID', cmap=['green', 'blue'], show_scalar_bar=False
+    ... )
 
     Plot the absolute value of the component stress in the Z direction.
 
@@ -4685,7 +4687,7 @@ def download_fea_hertzian_contact_cylinder(load=True):  # pragma: no cover
     >>> _ = pl.add_mesh(
     ...     grid,
     ...     scalars=z_stress,
-    ...     clim=[0, 1.2E9],
+    ...     clim=[0, 1.2e9],
     ...     cmap='jet',
     ...     lighting=True,
     ...     show_edges=False,