pick up existing pr url

README.md

@@ -11,7 +11,7 @@ A GitHub Action for creating pull requests.
  * Create pull requests
  * Add reviewers, assignees, labels, or milestones
  * Customize pull request title and body
- * Fail silently when a pull request already exists
+ * Retrieve the existing pull request URL in case pull request already exists
 
 
 ## Usage

entrypoint.sh

@@ -84,16 +84,33 @@ if [[ "$INPUT_PR_DRAFT" ==  "true" ]]; then
 fi
 
 COMMAND="GITHUB_TOKEN=\"$GITHUB_TOKEN\" hub pull-request \
-  -b $DESTINATION_BRANCH \
   -h $SOURCE_BRANCH \
+  -b $DESTINATION_BRANCH \
   --no-edit \
   $PR_ARG \
   || true"
 
 echo "$COMMAND"
 
 PR_URL=$(sh -c "$COMMAND")
-if [[ "$?" != "0" ]]; then
+
+
+if [[ -z "$PR_URL" ]]; then
+  # in case PR already exists, get its url
+  COMMAND="GITHUB_TOKEN=\"$GITHUB_TOKEN\" hub pr list \
+    -h $SOURCE_BRANCH \
+    -b $DESTINATION_BRANCH \
+    -f \"%U\" \
+    | head -n 1 \
+    || true"
+
+  echo "$COMMAND"
+
+  PR_URL=$(sh -c "$COMMAND")
+fi
+
+if [[ -z "$PR_URL" ]]; then
+  echo "Failed to create or retrieve existing pull request."
   exit 1
 fi