Updating README.

README.md

@@ -1,12 +1,14 @@
 # PR Commenter Diff-Aware Action
 
-A GitHub Action to automatically post comments to pull requests on **GitHub** or **Gitea**, based on a `git diff`. Supports:
+A GitHub/Gitea Action to automatically post comments to pull requests based on a `git diff`. Supports:
 
 - Inline comments per changed line
 - Multiline comment templates
 - Cross-platform support (GitHub and Gitea)
 - Diff-aware commenting, automatically detecting added lines
-- Default comment template with optional overrides
+- Default values for repository info
+- Optional `diff` input — can post general PR comments without a diff
+- Remote URL usage for Gitea Actions
 
 ---
 
@@ -15,8 +17,10 @@ A GitHub Action to automatically post comments to pull requests on **GitHub** or
 - **GitHub & Gitea support**: Works seamlessly on both platforms.
 - **Diff-aware**: Parses a `git diff` to determine which lines were added.
 - **Inline comments**: Comments appear directly on changed lines in PRs.
-- **Multiline templates**: Supports `{line}` for single line and `{lines}` for all added lines in a file.
-- **Reusable**: Works as a composite action and can be called from any workflow.
+- **Multiline templates**: Supports `{line}` for a single line and `{lines}` for all added lines in a file.
+- **Optional diff**: If no diff is provided, posts a general PR comment.
+- **Default repository values**: `repo_name`, `repo_owner`, and `api_url` default to GitHub environment variables if not provided.
+- **Remote URL usage**: Can reference the action directly from a Git repository URL for Gitea.
 
 ---
 
@@ -26,17 +30,19 @@ A GitHub Action to automatically post comments to pull requests on **GitHub** or
 |-------|-------------|----------|---------|
 | `platform` | Target platform: `github` or `gitea` | yes | `github` |
 | `token` | API token for authentication | yes | - |
-| `api_url` | Gitea API URL (only required for Gitea, e.g., `https://gitea.example.com/api/v1`) | no | - |
-| `repo_owner` | Repository owner (user/org) | yes | - |
-| `repo_name` | Repository name | yes | - |
+| `api_url` | Gitea API URL (only required for Gitea, e.g., `https://gitea.example.com/api/v1`) | no | `${{ github.api_url }}` |
+| `repo_owner` | Repository owner (user/org) | no | `${{ github.repository_owner }}` |
+| `repo_name` | Repository name | no | `${{ github.repository }}` |
 | `pr_index` | PR number (GitHub) or index (Gitea) | yes | - |
-| `diff` | Git diff to parse (generated via `git diff`) | yes | - |
-| `comment_template` | Multiline template for comment body. Use `{line}` for a single line and `{lines}` for all added lines in the file | yes | `Auto-comment: changed line -> {line}` |
+| `diff` | Git diff to parse (optional). If empty, posts only a general PR comment. | no | - |
+| `comment_template` | Multiline template for comment body. Use placeholders `{line}` and `{lines}` | no | `Auto-comment: changed line -> {line}` |
 
 ---
 
 ## Example Usage
 
+### GitHub PR
+
 ```yaml
 jobs:
   comment-pr-diff:
@@ -44,11 +50,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.11"
-
       - name: Generate git diff
         id: gitdiff
         run: |
@@ -56,12 +57,10 @@ jobs:
           git diff origin/main > diff.txt
 
       - name: Post diff-aware comments to GitHub PR
-        uses: ./  # path to this action
+        uses: "https://gitea.example.com/your-org/pr-commenter-action@main"
         with:
           platform: github
           token: ${{ secrets.GITHUB_TOKEN }}
-          repo_owner: ${{ github.repository_owner }}
-          repo_name: ${{ github.event.repository.name }}
           pr_index: ${{ github.event.pull_request.number }}
           diff: ${{ steps.gitdiff.outputs.diff }}
           comment_template: |
@@ -70,3 +69,35 @@ jobs:
             Changed line: {line}
             Full added lines in this file:
             {lines}
+```
+
+### Gitea PR
+
+```yaml
+jobs:
+  comment-pr-diff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Generate git diff
+        id: gitdiff
+        run: |
+          git fetch origin main
+          git diff origin/main > diff.txt
+
+      - name: Post diff-aware comments to Gitea PR
+        uses: "https://gitea.example.com/your-org/pr-commenter-action@main"
+        with:
+          platform: gitea
+          token: ${{ secrets.GITEA_TOKEN }}
+          api_url: "https://gitea.example.com/api/v1"
+          pr_index: 42
+          diff: ${{ steps.gitdiff.outputs.diff }}
+          comment_template: |
+            Auto-comment on file:
+            ---
+            Changed line: {line}
+            Full added lines in this file:
+            {lines}
+```