try

.github/workflows/test.yml

@@ -16,9 +16,39 @@ jobs:
     steps:
       - name: Check out repository
         uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+      - name: Update Pip
+        run: pip install -U pip
+      - name: Install required dependencies
+        run: pip install py2puml
+      - name: Build Class Diagram
+        id: build_class_diagram
+        run: |
+          if test -f ${INPUT_PUML_OUTPUT_PATH}; then
+              py2puml ${INPUT_PATH} ${INPUT_MODULE} > ${INPUT_PUML_OUTPUT_PATH}_staging
+              update_class_diagram=$(
+                if [[ $(diff ${INPUT_PUML_OUTPUT_PATH}_staging ${INPUT_PUML_OUTPUT_PATH}) ]]; then
+                  echo "true"
+                else
+                  echo "false"
+                fi
+              )
+              if [ $update_class_diagram = "true" ]; then
+                mv ${INPUT_PUML_OUTPUT_PATH}_staging ${INPUT_PUML_OUTPUT_PATH}
+              else
+                rm ${INPUT_PUML_OUTPUT_PATH}_staging
+              fi
+          else
+              py2puml ${INPUT_PATH} ${INPUT_MODULE} > ${INPUT_PUML_OUTPUT_PATH}
+              update_class_diagram="true"
+          fi
+          echo "update_class_diagram=${update_class_diagram}" >> "$GITHUB_OUTPUT"
       - name: Render diagram
         uses: ./
         with:
-          args: "-tpng test_diagram.puml"
+          args: "-tpng "${INPUT_PNG_OUTPUT_PATH}
       - name: Display diagram
         run: cat test_diagram.png

action.yml

@@ -3,6 +3,21 @@ description: GitHub Action for drawing UML diagrams with PlantUML
 inputs:
   version:
     description: PlantUML software version
+    required: false
+  path:
+    description: the filepath to the domain following the py2puml definition
+    required: true
+  module:
+    description: the module name of the domain following the py2puml definition
+    required: true
+  png_output_path:
+    description: the filepath to the output PNG
+    default: class_diagram.png
+    required: false
+  puml_output_path:
+    description: the filepath to the output PUML
+    default: class_diagram.puml
+    required: false
 runs:
   using: docker
   image: Dockerfile