Add SBT in cache managers.

README.md

@@ -25,7 +25,7 @@ Inputs `java-version` and `distribution` are mandatory. See [Supported distribut
 **Eclipse Temurin**
 ```yaml
 steps:
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
 - uses: actions/setup-java@v2
   with:
     distribution: 'temurin' # See 'Supported distributions' for available options
@@ -36,7 +36,7 @@ steps:
 **Zulu OpenJDK**
 ```yaml
 steps:
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
 - uses: actions/setup-java@v2
   with:
     distribution: 'zulu' # See 'Supported distributions' for available options
@@ -69,13 +69,14 @@ Currently, the following distributions are supported:
 The action has a built-in functionality for caching and restoring dependencies. It uses [actions/cache](https://github.com/actions/cache) under hood for caching dependencies but requires less configuration settings. Supported package managers are gradle and maven. The format of the used cache key is `setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}`, where the hash is based on the following files:
 - gradle: `**/*.gradle*`, `**/gradle-wrapper.properties`
 - maven: `**/pom.xml`
+- sbt:  `**/build.sbt`
 
 The cache input is optional, and caching is turned off by default.
 
 #### Caching gradle dependencies
 ```yaml
 steps:
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
 - uses: actions/setup-java@v2
   with:
     distribution: 'temurin'
@@ -87,7 +88,7 @@ steps:
 #### Caching maven dependencies
 ```yaml
 steps:
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
 - uses: actions/setup-java@v2
   with:
     distribution: 'temurin'
@@ -97,6 +98,19 @@ steps:
   run: mvn -B package --file pom.xml
 ```
 
+#### Caching sbt dependencies
+```yaml
+steps:
+- uses: actions/checkout@v3
+- uses: actions/setup-java@v2
+  with:
+    distribution: 'temurin'
+    java-version: '11'
+    cache: 'sbt'
+- name: Build with SBT
+  run: sbt package
+```
+
 ### Check latest
 In the basic examples above, the `check-latest` flag defaults to `false`. When set to `false`, the action tries to first resolve a version of Java from the local tool cache on the runner. If unable to find a specific version in the cache, the action will download a version of Java. Use the default or set `check-latest` to `false` if you prefer a faster more consistent setup experience that prioritizes trying to use the cached versions at the expense of newer versions sometimes being available for download.
 
@@ -107,7 +121,7 @@ For Java distributions that are not cached on Hosted images, `check-latest` alwa
 
 ```yaml
 steps:
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
 - uses: actions/setup-java@v2
   with:
     distribution: 'adopt'
@@ -126,7 +140,7 @@ jobs:
         java: [ '8', '11', '13', '15' ]
     name: Java ${{ matrix.Java }} sample
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup java
         uses: actions/setup-java@v2
         with:

__tests__/cache.test.ts

@@ -118,6 +118,23 @@ describe('dependency cache', () => {
         expect(spyInfo).toBeCalledWith('gradle cache is not found');
       });
     });
+    describe('for sbt', () => {
+      it('throws error if no build.sbt found', async () => {
+        await expect(restore('sbt')).rejects.toThrowError(
+          `No file in ${projectRoot(
+            workspace
+          )} matched to [**/build.sbt], make sure you have checked out the target repository`
+        );
+      });
+      it('downloads cache', async () => {
+        createFile(join(workspace, 'build.sbt'));
+
+        await restore('sbt');
+        expect(spyCacheRestore).toBeCalled();
+        expect(spyWarning).not.toBeCalled();
+        expect(spyInfo).toBeCalledWith('sbt cache is not found');
+      });
+    });
   });
   describe('save', () => {
     let spyCacheSave: jest.SpyInstance<
@@ -194,6 +211,30 @@ describe('dependency cache', () => {
         expect(spyInfo).toBeCalledWith(expect.stringMatching(/^Cache saved with the key:.*/));
       });
     });
+    describe('for sbt', () => {
+      it('uploads cache even if no build.sbt found', async () => {
+        createStateForMissingBuildFile();
+        await save('sbt');
+        expect(spyCacheSave).toBeCalled();
+        expect(spyWarning).not.toBeCalled();
+      });
+      it('does not upload cache if no restore run before', async () => {
+        createFile(join(workspace, 'build.sbt'));
+
+        await save('sbt');
+        expect(spyCacheSave).not.toBeCalled();
+        expect(spyWarning).toBeCalledWith('Error retrieving key from state.');
+      });
+      it('uploads cache', async () => {
+        createFile(join(workspace, 'build.sbt'));
+        createStateForSuccessfulRestore();
+
+        await save('sbt');
+        expect(spyCacheSave).toBeCalled();
+        expect(spyWarning).not.toBeCalled();
+        expect(spyInfo).toBeCalledWith(expect.stringMatching(/^Cache saved with the key:.*/));
+      });
+    });
   });
 });
 

__tests__/cache/sbt/build.sbt

@@ -0,0 +1 @@
+ThisBuild / scalaVersion := "3.1.1"

src/cache.ts

@@ -13,7 +13,7 @@ const CACHE_MATCHED_KEY = 'cache-matched-key';
 const CACHE_KEY_PREFIX = 'setup-java';
 
 interface PackageManager {
-  id: 'maven' | 'gradle';
+  id: 'maven' | 'gradle' | 'sbt';
   /**
    * Paths of the file that specify the files to cache.
    */
@@ -32,6 +32,12 @@ const supportedPackageManager: PackageManager[] = [
     path: [join(os.homedir(), '.gradle', 'caches'), join(os.homedir(), '.gradle', 'wrapper')],
     // https://github.com/actions/cache/blob/0638051e9af2c23d10bb70fa9beffcad6cff9ce3/examples.md#java---gradle
     pattern: ['**/*.gradle*', '**/gradle-wrapper.properties']
+  },
+  {
+    id: 'sbt',
+    path: [join(os.homedir(), '.ivy2', 'cache'), join(os.homedir(), '.sbt')],
+    // https://github.com/actions/cache/blob/0638051e9af2c23d10bb70fa9beffcad6cff9ce3/examples.md#scala---sbt
+    pattern: ['**/build.sbt']
   }
 ];