Default values for inputs; diff is optional.

action.yml

@@ -15,18 +15,17 @@ runs:
         python-version: "3.11"
 
     - name: Install dependencies
-      shell: bash
       run: pip install requests
 
     - name: Run PR commenter
-      run: python git-auto-comment.py
+      run: python comment_pr_diff.py
       shell: python
       env:
         PLATFORM: ${{ inputs.platform }}
         TOKEN: ${{ inputs.token }}
-        API_URL: ${{ inputs.api_url }}
-        REPO_OWNER: ${{ inputs.repo_owner }}
-        REPO_NAME: ${{ inputs.repo_name }}
+        API_URL: ${{ inputs.api_url || github.api_url }}
+        REPO_OWNER: ${{ inputs.repo_owner || github.repository_owner }}
+        REPO_NAME: ${{ inputs.repo_name || github.repository }}
         PR_INDEX: ${{ inputs.pr_index }}
         DIFF: ${{ inputs.diff }}
         COMMENT_TEMPLATE: ${{ inputs.comment_template }}
@@ -44,21 +43,21 @@ inputs:
     required: false
   repo_owner:
     description: "Repository owner (user/org)"
-    required: true
+    required: false
   repo_name:
     description: "Repository name"
-    required: true
+    required: false
   pr_index:
     description: "PR number (GitHub) or index (Gitea)"
     required: true
   diff:
-    description: "Git diff to parse, in standard format (generated via git diff)"
-    required: true
+    description: "Git diff to parse (optional). If empty, posts only a general PR comment."
+    required: false
   comment_template:
     description: |
       Multiline template for comment body.
       Use placeholders:
         - {line}  → replaced by single changed line
         - {lines} → replaced by all added lines in the file
-    required: true
-    default: "Auto-comment: changed line -> {line}"
+    required: false
+    default: "Auto-comment: changed line -> {line}"