build: update how changelogs work

.github/workflows/modrinth-publish.yml

@@ -16,12 +16,50 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Checkout main branch from GitHub
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Restore last workflow commit from cache
+        id: cache-last-commit
+        uses: actions/cache@v4
+        with:
+          path: .last_workflow_commit
+          key: last-workflow-commit
+
+      - name: Get last workflow run commit
+        id: last_run
+        run: |
+          if [ -f .last_workflow_commit ]; then
+            LAST_COMMIT=$(cat .last_workflow_commit)
+          else
+            LAST_COMMIT=$(git rev-list --max-parents=0 HEAD)
+          fi
+          echo "LAST_COMMIT=$LAST_COMMIT" >> $GITHUB_ENV
+
+      - name: Count commits since last run
+        id: count_commits
+        run: |
+          COMMITS=$(git rev-list $LAST_COMMIT..HEAD --count)
+          echo "commits_count=$COMMITS" >> $GITHUB_ENV
+          echo "Number of commits since last run: $COMMITS"
+
+      - name: Use environment variables
+        run: |
+          echo "Last commit: $LAST_COMMIT"
+          echo "Number of commits: $commits_count"
+
+      - name: Store current commit for next run
+        run: |
+          git rev-parse HEAD > .last_workflow_commit
+          echo "Storing current commit: $(cat .last_workflow_commit)"
+
       # Runs a single command using the runners shell
       - name: Setting up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
           java-version: 21
+
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
@@ -30,4 +68,10 @@ jobs:
           MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
         run: |
           chmod +x gradlew
-          ./gradlew :modrinth
+          ./gradlew :modrinth
+
+      - name: Store current commit for next run
+        uses: actions/cache@v4
+        with:
+          path: .last_workflow_commit
+          key: last-workflow-commit

build.gradle.kts

@@ -142,25 +142,27 @@ modrinth {
 }
 
 fun getChangeLog(): String {
-  val currentBranch = grgit.branch.current().name
-  val remoteBranch = "origin/$currentBranch"
+  val lastCommitEnv = System.getenv("LAST_COMMIT")
+    ?: return "The environment variable \$LAST_COMMIT is not defined."
 
-  val lastRemoteCommit = grgit.log {
-    range(remoteBranch, currentBranch)
-  }.lastOrNull()?.id ?: return "No se encontraron cambios desde el remoto."
+  val commitExists = grgit.log().any { it.id == lastCommitEnv }
+  if (!commitExists) {
+    return "The commit specified in \$LAST_COMMIT does not exist in this repository."
+  }
 
   val changeLog = grgit.log {
-    range(lastRemoteCommit, currentBranch)
+    range(lastCommitEnv, "HEAD")
   }
 
   return if (changeLog.isNotEmpty()) {
     changeLog.joinToString("\n") { commit ->
       "- ${commit.shortMessage} (${commit.id})"
     }
   } else {
-    "No changes found."
+    "There are no changes since the commit specified in \$LAST_COMMIT."
   }
 }
+
 tasks.modrinth {
   dependsOn(tasks.shadowJar)
   dependsOn(tasks.modrinthSyncBody)