Add option to format Jupyter Notebooks in GitHub Action (#3282)

To run the formatter on Jupyter Notebooks, Black must be installed
with an extra dependency (`black[jupyter]`). This commit adds an
optional argument to install Black with this dependency when using the
official GitHub Action [1]. To enable the formatter on Jupyter
Notebooks, just add `jupyter: true` as an argument. Feature requested
at [2].

[1]: https://black.readthedocs.io/en/stable/integrations/github_actions.html
[2]: https://github.com/psf/black/issues/3280

Signed-off-by: Antonio Ossa Guerra <aaossa@uc.cl>

AUTHORS.md

@@ -29,6 +29,7 @@ Multiple contributions by:
 - [Andrey](mailto:dyuuus@yandex.ru)
 - [Andy Freeland](mailto:andy@andyfreeland.net)
 - [Anthony Sottile](mailto:asottile@umich.edu)
+- [Antonio Ossa Guerra](mailto:aaossa+black@uc.cl)
 - [Arjaan Buijk](mailto:arjaan.buijk@gmail.com)
 - [Arnav Borbornah](mailto:arnavborborah11@gmail.com)
 - [Artem Malyshev](mailto:proofit404@gmail.com)

CHANGES.md

@@ -58,6 +58,8 @@
 
 <!-- For example, Docker, GitHub Actions, pre-commit, editors -->
 
+- Update GitHub Action to support formatting of Jupyter Notebook files via a `jupyter`
+  option (#3282)
 - Update GitHub Action to support use of version specifiers (e.g. `<23`) for Black
   version (#3265)
 

action.yml

@@ -12,6 +12,11 @@ inputs:
     description: "Source to run Black. Default: '.'"
     required: false
     default: "."
+  jupyter:
+    description:
+      "Set this option to true to include Jupyter Notebook files. Default: false"
+    required: false
+    default: false
   black_args:
     description: "[DEPRECATED] Black input arguments."
     required: false
@@ -38,6 +43,7 @@ runs:
         # TODO: Remove once https://github.com/actions/runner/issues/665 is fixed.
         INPUT_OPTIONS: ${{ inputs.options }}
         INPUT_SRC: ${{ inputs.src }}
+        INPUT_JUPYTER: ${{ inputs.jupyter }}
         INPUT_BLACK_ARGS: ${{ inputs.black_args }}
         INPUT_VERSION: ${{ inputs.version }}
         pythonioencoding: utf-8

action/main.py

@@ -9,6 +9,7 @@
 ENV_BIN = ENV_PATH / ("Scripts" if sys.platform == "win32" else "bin")
 OPTIONS = os.getenv("INPUT_OPTIONS", default="")
 SRC = os.getenv("INPUT_SRC", default="")
+JUPYTER = os.getenv("INPUT_JUPYTER") == "true"
 BLACK_ARGS = os.getenv("INPUT_BLACK_ARGS", default="")
 VERSION = os.getenv("INPUT_VERSION", default="")
 
@@ -17,7 +18,11 @@
 version_specifier = VERSION
 if VERSION and VERSION[0] in "0123456789":
     version_specifier = f"=={VERSION}"
-req = f"black[colorama]{version_specifier}"
+if JUPYTER:
+    extra_deps = "[colorama,jupyter]"
+else:
+    extra_deps = "[colorama]"
+req = f"black{extra_deps}{version_specifier}"
 pip_proc = run(
     [str(ENV_BIN / "python"), "-m", "pip", "install", req],
     stdout=PIPE,

docs/integrations/github_actions.md

@@ -39,6 +39,10 @@ or just the version number if you want an exact version. The action defaults to
 latest release available on PyPI. Only versions available from PyPI are supported, so no
 commit SHAs or branch names.
 
+If you want to include Jupyter Notebooks, _Black_ must be installed with the `jupyter`
+extra. Installing the extra and including Jupyter Notebook files can be configured via
+`jupyter` (default is `false`).
+
 You can also configure the arguments passed to _Black_ via `options` (defaults to
 `'--check --diff'`) and `src` (default is `'.'`)
 
@@ -49,6 +53,7 @@ Here's an example configuration:
   with:
     options: "--check --verbose"
     src: "./src"
+    jupyter: true
     version: "21.5b1"
 ```