modify pre-preview to show correct url in preview page

Author: yuanyl630

.github/workflows/pr-preview.yml

@@ -46,13 +46,22 @@ jobs:
       - name: Modify Antora Playbooks for Local PR Build
         working-directory: ./ivory-doc-builder
         env:
-          DETECTED_VERSION: 'master'
+          PR_BASE_REF: ${{ github.event.pull_request.base.ref }}
           START_PAGE_COMPONENT_NAME: "ivorysql-doc"
           START_PAGE_FILE_PATH: "welcome.adoc"
         run: |
           PLAYBOOK_FILES=("antora-playbook-CN.yml" "antora-playbook-EN.yml")
           NEW_LOCAL_URL="../ivorysql_doc"
 
+          # Extract version from PR base branch (e.g., v5.1 -> 5.1)
+          if [[ "$PR_BASE_REF" =~ ^v([0-9]+\.[0-9]+) ]]; then
+            DETECTED_VERSION="${BASH_REMATCH[1]}"
+            echo "Detected version from PR base branch $PR_BASE_REF: $DETECTED_VERSION"
+          else
+            DETECTED_VERSION="master"
+            echo "Using default version: master (PR base: $PR_BASE_REF)"
+          fi
+
           for PLAYBOOK_FILE in "${PLAYBOOK_FILES[@]}"; do
             if [ -f "$PLAYBOOK_FILE" ]; then
               echo "--- Modifying Playbook: $PLAYBOOK_FILE ---"
@@ -65,13 +74,27 @@ jobs:
               yq -i ".content.sources[0].branches = [\"HEAD\"]" "$PLAYBOOK_FILE"
               
               yq -i ".content.sources[0].edit_url = false" "$PLAYBOOK_FILE"
+              
               if [[ -n "$DETECTED_VERSION" ]]; then
-                NEW_START_PAGE="${START_PAGE_COMPONENT_NAME}::${DETECTED_VERSION}/${START_PAGE_FILE_PATH}"
+                # v5.1+ uses flat structure (no version prefix in path)
+                # v5.0 and earlier use nested structure (version prefix in path)
+                # Use version comparison: if DETECTED_VERSION >= 5.1, use flat structure
+                if [[ "$DETECTED_VERSION" == "master" ]]; then
+                  # Master branch uses nested structure with 'master' prefix
+                  NEW_START_PAGE="${START_PAGE_COMPONENT_NAME}:${DETECTED_VERSION}:${DETECTED_VERSION}/${START_PAGE_FILE_PATH}"
+                elif [[ "$(printf '%s\n' "5.1" "$DETECTED_VERSION" | sort -V | head -n1)" == "5.1" ]]; then
+                  # For v5.1+: ivorysql-doc:v5.1:welcome.adoc (no version prefix in path)
+                  NEW_START_PAGE="${START_PAGE_COMPONENT_NAME}:v${DETECTED_VERSION}:${START_PAGE_FILE_PATH}"
+                else
+                  # For v5.0 and earlier: ivorysql-doc:v5.0:v5.0/welcome.adoc (with version prefix)
+                  NEW_START_PAGE="${START_PAGE_COMPONENT_NAME}:v${DETECTED_VERSION}:v${DETECTED_VERSION}/${START_PAGE_FILE_PATH}"
+                fi
                 yq -i ".site.start_page = \"$NEW_START_PAGE\"" "$PLAYBOOK_FILE"
                 echo "Updated .site.start_page in $PLAYBOOK_FILE to: $NEW_START_PAGE"
               else
                 echo "WARNING: DETECTED_VERSION is empty. Skipping start_page update for $PLAYBOOK_FILE."
               fi
+              
               yq -i ".site.title = .site.title + \" (PR Preview)\"" "$PLAYBOOK_FILE"
               echo "Modified content of $PLAYBOOK_FILE:"
               cat "$PLAYBOOK_FILE"