fix: bug retrieving diff with custom a base sha (#945)

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

.github/workflows/test.yml

@@ -950,18 +950,6 @@ jobs:
           fi
         shell:
           bash
-      - name: Run changed-files with custom sha
-        id: changed-files-custom-sha
-        if: github.event_name == 'pull_request' && github.event.action != 'closed'
-        uses: ./
-        with:
-          sha: ${{ github.event.pull_request.head.sha }}
-      - name: Show output
-        if: github.event.action != 'closed'
-        run: |
-          echo '${{ toJSON(steps.changed-files-custom-sha.outputs) }}'
-        shell:
-          bash
       - name: Get branch name
         id: branch-name
         uses: tj-actions/branch-names@v6
@@ -984,6 +972,31 @@ jobs:
           echo '${{ toJSON(steps.changed-files-custom-base-sha.outputs) }}'
         shell:
           bash
+      - name: Run changed-files with custom sha
+        id: changed-files-custom-sha
+        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        uses: ./
+        with:
+          sha: ${{ github.event.pull_request.head.sha }}
+      - name: Show output
+        if: github.event.action != 'closed'
+        run: |
+          echo '${{ toJSON(steps.changed-files-custom-sha.outputs) }}'
+        shell:
+          bash
+      - name: Run changed-files with the pull request base sha and head sha
+        id: changed-files-pull-request-base-sha-head-sha
+        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        uses: ./
+        with:
+          base_sha: ${{ github.event.pull_request.base.sha }}
+          sha: ${{ github.event.pull_request.head.sha }}
+      - name: Show output
+        if: github.event.action != 'closed'
+        run: |
+          echo '${{ toJSON(steps.changed-files-pull-request-base-sha-head-sha.outputs) }}'
+        shell:
+          bash
       - name: Run changed-files with specific files (only-changed)
         id: changed-files-specific-only-changed
         uses: ./

diff-sha.sh

@@ -223,6 +223,10 @@ else
     echo "::debug::Previous SHA: $PREVIOUS_SHA"
   else
     PREVIOUS_SHA=$INPUT_BASE_SHA && exit_status=$? || exit_status=$?
+
+    if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
+        DIFF=".."
+    fi
   fi
 
   echo "::debug::Target branch: $TARGET_BRANCH"