GitHub Actions: cache buildSrc/build to speed up Gradle builds by ~40 seconds

Author: DevCharly

.editorconfig

@@ -7,6 +7,11 @@ charset = latin1
 indent_style = tab
 indent_size = 4
 
+[{*.yaml,*.yml}]
+end_of_line = lf
+indent_style = space
+indent_size = 2
+
 [*.java]
 indent_style = tab
 ij_continuation_indent_size = 4

.github/actions/cache-gradle/action.yml

@@ -0,0 +1,32 @@
+# https://docs.github.com/en/actions/tutorials/create-actions/create-a-composite-action#creating-a-composite-action-within-the-same-repository
+
+# cache uses two files:
+#
+#   - gradle-wrapper-<os>-<arch>-<hash>:
+#       contains the Gradle wrapper/distribution (~/.gradle/wrapper)
+#       and is updated when the Gradle version changed
+#   - gradle-caches-<os>-<arch>-<hash>:
+#       contains the Gradle caches (~/.gradle/caches), buildSrc/build and buildSrc/.gradle
+#       and is updated when Gradle related files were changed
+#       buildSrc/.gradle is needed so that buildSrc tasks are UP-TO-DATE
+
+name: 'Cache Gradle'
+runs:
+  using: "composite"
+  steps:
+
+    - name: Cache '.gradle/wrapper'
+      uses: actions/cache@v4
+      with:
+        key: gradle-wrapper-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles( 'gradle/wrapper/gradle-wrapper.properties' ) }}
+        path: |
+          ~/.gradle/wrapper
+
+    - name: Cache '.gradle/caches' and 'buildSrc/build'
+      uses: actions/cache@v4
+      with:
+        key: gradle-caches-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles( '**/*.gradle*', 'gradle/**', 'gradle.properties', 'buildSrc/src/**' ) }}
+        path: |
+          ~/.gradle/caches
+          buildSrc/build
+          buildSrc/.gradle

.github/workflows/ci.yml

@@ -14,6 +14,7 @@ on:
       - '.*'
       - '**/.settings/**'
       - 'flatlaf-core/svg/**'
+      - 'flatlaf-natives/**'
       - 'flatlaf-testing/dumps/**'
       - 'flatlaf-testing/misc/**'
       - 'images/**'
@@ -32,7 +33,9 @@ jobs:
         with:
           java-version: 21
           distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
+
+      - name: Cache Gradle
+        uses: ./.github/actions/cache-gradle
 
 
         # test against
@@ -100,7 +103,9 @@ jobs:
         with:
           java-version: 21
           distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
+
+      - name: Cache Gradle
+        uses: ./.github/actions/cache-gradle
 
       - name: Release a new stable version to Maven Central
         run: ./gradlew publishToSonatype closeSonatypeStagingRepository :flatlaf-demo:build :flatlaf-theme-editor:build -PskipFonts -Prelease -Dorg.gradle.parallel=false

.github/workflows/error-prone.yml

@@ -14,6 +14,7 @@ on:
       - '.*'
       - '**/.settings/**'
       - 'flatlaf-core/svg/**'
+      - 'flatlaf-natives/**'
       - 'flatlaf-testing/dumps/**'
       - 'flatlaf-testing/misc/**'
       - 'images/**'
@@ -31,7 +32,9 @@ jobs:
         with:
           java-version: 21
           distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
+
+      - name: Cache Gradle
+        uses: ./.github/actions/cache-gradle
 
       - name: Check with Error Prone
         run: ./gradlew errorprone

.github/workflows/fonts.yml

@@ -39,7 +39,9 @@ jobs:
               with:
                   java-version: 21
                   distribution: temurin  # pre-installed on ubuntu-latest
-                  cache: gradle
+
+            - name: Cache Gradle
+              uses: ./.github/actions/cache-gradle
 
             - name: Build with Gradle
               run: ./gradlew :flatlaf-fonts-${{ matrix.font }}:build

.github/workflows/natives.yml

@@ -63,7 +63,9 @@ jobs:
               with:
                   java-version: 21
                   distribution: temurin
-                  cache: gradle
+
+            - name: Cache Gradle
+              uses: ./.github/actions/cache-gradle
 
             - name: Build with Gradle
               # --no-daemon is necessary on Windows otherwise caching Gradle would fail with:

.github/workflows/pr-snapshots.yml

@@ -26,7 +26,9 @@ jobs:
         with:
           java-version: 21
           distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
+
+      - name: Cache Gradle
+        uses: ./.github/actions/cache-gradle
 
       - name: Publish PR snapshot to Sonatype Central
         run: >