Set title and description written in line-openapi PR (#633)

line/line-openapi#74

Author: Yang-33

.github/workflows/diff-check.yml

@@ -57,18 +57,34 @@ jobs:
           echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
       - if: ${{ env.DIFF_IS_EMPTY != 'true' }}
         run: |
+          BRANCH_NAME="update-diff-${{ env.CURRENT_DATETIME }}"
+          
           git config user.name github-actions
           git config user.email github-actions@github.com
-          git checkout -b update-diff-${{ env.CURRENT_DATETIME }}
+          git checkout -b $BRANCH_NAME
           
           git add line-openapi
           git add src/**
           git commit --allow-empty -m "Codes are generated by openapi generator"
           
           git add docs/**
-          git commit --allow-empty -m "Update document"     
+          git commit --allow-empty -m "Update document"
+          
+          git push origin $BRANCH_NAME
           
-          git push origin update-diff-${{ env.CURRENT_DATETIME }}
-          gh pr create -B ${{ github.ref_name }} -t "Codes are generated by openapi generator" -b "" --label "line-openapi-update"
+          # Determine PR title and body
+          if [ "$CHANGE_TYPE" == "submodule-update" ]; then
+            # Fetch PR info from submodule
+            npx zx ./line-openapi/tools/get-pr-info.mjs
+            PR_INFO=$(cat pr_info.json)
+            TITLE=$(echo "$PR_INFO" | jq -r '.title')
+            BODY=$(echo "$PR_INFO" | jq -r '.url')$'\n\n'$(echo "$PR_INFO" | jq -r '.body')
+          else
+            # Default PR title and body
+            TITLE="Codes are generated by openapi generator"
+            BODY="⚠Reviewer: Please edit this description to include relevant information about the changes.⚠"
+          fi
+
+          gh pr create -B ${{ github.ref_name }} -H $BRANCH_NAME -t "$TITLE" -b "$BODY" --label "line-openapi-update"
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}