Release gh action (#1909)

* Gets gh-action ready for marketplace release

* Updates documentation and removes redundant gh-action input argument

* Fixes gh-action bug

This commit fixes a bug which caused not all input arguments were forwarder to the black formatter.

* Update README.md

Co-authored-by: Cooper Lees <me@cooperlees.com>

Co-authored-by: Cooper Lees <me@cooperlees.com>

README.md

@@ -411,8 +411,16 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
       - uses: psf/black@stable
+        with:
+          black_args: ". --check"
 ```
 
+### Inputs
+
+#### `black_args`
+
+**optional**: Black input arguments. Defaults to `. --check --diff`.
+
 ## Ignoring unmodified files
 
 _Black_ remembers files it has already formatted, unless the `--diff` flag is used or

action.yml

@@ -1,6 +1,11 @@
 name: "Black"
 description: "The uncompromising Python code formatter."
 author: "Łukasz Langa and contributors to Black"
+inputs:
+  black_args:
+    description: "Black input arguments."
+    required: false
+    default: ""
 branding:
   color: "black"
   icon: "check-circle"

action/entrypoint.sh

@@ -1,10 +1,17 @@
 #!/bin/sh
 set -e
 
-if [ $# -eq 0 ]; then
-    # Default (if no args provided).
-    sh -c "black . --check --diff"
+# If no arguments are given use current working directory
+black_args=(".")
+if [ "$#" -eq 0 ] && [ "${INPUT_BLACK_ARGS}" != "" ]; then
+  black_args+=(${INPUT_BLACK_ARGS})
+elif [ "$#" -ne 0 ] && [ "${INPUT_BLACK_ARGS}" != "" ]; then
+  black_args+=($* ${INPUT_BLACK_ARGS})
+elif [ "$#" -ne 0 ] && [ "${INPUT_BLACK_ARGS}" == "" ]; then
+  black_args+=($*)
 else
-    # Custom args.
-    sh -c "black $*"
+  # Default (if no args provided).
+  black_args+=("--check" "--diff")
 fi
+
+sh -c "black . ${black_args[*]}"