Add pr_number to outputs

As requested in #104

Also updated setting outputs to a new format.

README.md

@@ -78,9 +78,10 @@ Features:
 | title          | No       | *subject of the first commit* | Pull request title.                                                                                                      |
 
 
-| Outputs | Description      |
-| ------- | ---------------- |
-| url     | Pull request URL |
+| Outputs   | Description                   |
+| --------- | ----------------------------- |
+| url       | Pull request URL              |
+| pr_number | Number of GitHub pull request |
 
 
 ### How get_diff works

entrypoint.sh

@@ -165,7 +165,7 @@ if [[ -z "${PR_NUMBER}" ]]; then
   echo -e "\n${TEMPLATE}" >> /tmp/template
   echo -e "\nTemplate:"
   cat /tmp/template
-  # shellcheck disable=SC2016
+  # shellcheck disable=SC2016,SC2124
   COMMAND="hub pull-request -b ${TARGET_BRANCH} -h ${SOURCE_BRANCH} --no-edit ${ARG_LIST[@]}"
   echo -e "\nRunning: ${COMMAND}"
   URL=$(sh -c "${COMMAND}")
@@ -181,7 +181,10 @@ else
 fi
 
 # Finish
-echo "::set-output name=url::${URL}"
+{
+  echo "url=${URL}"
+  echo "pr_number=${PR_NUMBER}"
+} >> "$GITHUB_OUTPUT"
 if [[ ${RET_CODE} != "0" ]]; then
   echo -e "\n[ERROR] Check log for errors."
   exit 1