Split auto update workflow to only run updates if needed

Author: Dreeam-qwq

.github/workflows/auto-update.yml

@@ -6,10 +6,15 @@ on:
     - cron: "0 0 * * *"
 
 jobs:
-  build:
+  fetch_update:
+    name: Fetch Update
     # Run workflow only on main repo
     if: ${{ github.repository == 'Winds-Studio/Leaf' }}
     runs-on: ubuntu-latest
+    outputs:
+      update_needed: ${{ steps.checkUpdate.outputs.update_needed }}
+      paper_commit: ${{ steps.paperCommit.outputs.paper_commit }}
+      curr_paper_commit: ${{ steps.currPaperCommit.outputs.curr_paper_commit }}
     steps:
       - name: Checkout Leaf repository
         uses: actions/checkout@v6
@@ -22,33 +27,58 @@ jobs:
         with:
           path: 'Paper'
           repository: "PaperMC/Paper"
+          ref: "ver/1.21.8"
           token: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Get Paper latest commit Hash
+      - name: Get Paper latest commit hash
         id: paperCommit
         run: |
           cd Paper
-          echo "paperCommit=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+          echo "paper_commit=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
 
-      - name: Get Leaf Current Paper commit Hash
+      - name: Get Leaf current Paper commit hash
         id: currPaperCommit
         run: |
           cd Leaf
-          currPaperCommit=$(grep "^paperCommit\s*=" gradle.properties | sed 's/^paperCommit\s*=\s*//')
-          echo "currPaperCommit=$currPaperCommit" >> $GITHUB_OUTPUT
+          currPaperCommit=$(awk -F '= *' '/^paperCommit/ {print $2}' gradle.properties)
+          echo "curr_paper_commit=$currPaperCommit" >> $GITHUB_OUTPUT
+
+      - name: Check if update is needed
+        id: checkUpdate
+        run: |
+          if [ "$PAPER_COMMIT" != "$CURR_PAPER_COMMIT" ]; then
+            echo "update_needed=true" >> $GITHUB_OUTPUT
+          else
+            echo "update_needed=false" >> $GITHUB_OUTPUT
+          fi
+        env:
+          PAPER_COMMIT: ${{ steps.currPaperCommit.outputs.paper_commit }}
+          CURR_PAPER_COMMIT: ${{ steps.paperCommit.outputs.curr_paper_commit }}
+
+  build:
+    name: Update and Build Leaf
+    needs: fetch_update
+    if: ${{ needs.fetch_update.outputs.update_needed == 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Leaf repository
+        uses: actions/checkout@v6
+        with:
+          path: 'Leaf'
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Update paperCommit in Leaf
         run: |
           cd Leaf
           sed -i "s/\(paperCommit\s*=\s*\).*/\1$PAPER_COMMIT/" gradle.properties
         env:
-          PAPER_COMMIT: ${{ steps.paperCommit.outputs.paperCommit }}
+          PAPER_COMMIT: ${{ needs.fetch_update.outputs.paper_commit }}
 
       - name: Grant execute permission for gradlew
         run: |
           cd Leaf
-          git config --global user.name "Dreeam-qwq"
-          git config --global user.email [email protected]
+          git config --global user.email "[email protected]"
+          git config --global user.name "Github Actions"
           chmod +x gradlew
 
       - uses: actions/setup-java@v5
@@ -80,4 +110,4 @@ jobs:
             echo "No changes to commit."
           fi
         env:
-          CURR_PAPER_COMMIT: ${{ steps.currPaperCommit.outputs.currPaperCommit }}
+          CURR_PAPER_COMMIT: ${{ needs.fetch_update.outputs.curr_paper_commit }}