Migrate build to Gradle

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: DeterminateSystems/magic-nix-cache-action@v13
 
       - name: Main project tests
-        run: nix develop .#jdk${{ matrix.java }} --command sbt test
+        run: nix develop .#jdk${{ matrix.java }} --command gradle test --no-daemon
 
   docker_test:
     runs-on: ubuntu-latest
@@ -83,8 +83,8 @@ jobs:
 
       - uses: DeterminateSystems/magic-nix-cache-action@v13
 
-      - run: nix develop --command sbt cli/pack
-      - run: echo "$PWD/scip-java/target/pack/bin" >> "$GITHUB_PATH"
+      - run: nix develop --command gradle :scip-java:installDist --no-daemon
+      - run: echo "$PWD/scip-java/build/install/scip-java/bin" >> "$GITHUB_PATH"
       - name: Auto-index scip-java codebase
         run: |
           # shellcheck disable=SC2016
@@ -113,10 +113,10 @@ jobs:
       - uses: DeterminateSystems/magic-nix-cache-action@v13
 
       - name: scip-kotlinc tests
-        run: nix develop --command sbt scipKotlinc/test
+        run: nix develop --command gradle :scip-kotlinc:test --no-daemon
 
       - name: Regenerate snapshots
-        run: nix develop --command sbt scipSnapshots/run
+        run: nix develop --command gradle :scip-snapshots:saveSnapshots --no-daemon
 
       - name: Check snapshot drift
         run: |
@@ -141,13 +141,13 @@ jobs:
 
       - run: |
           nix develop .#jdk${{ matrix.java }} --command \
-            sbt --error cli/pack publishM2 publishLocal
+            gradle --no-daemon :scip-java:installDist publishToMavenLocal
           SCIP_JAVA_VERSION="$(
-            sed -n 's/^version:=//p' scip-java/target/pack/VERSION
+            sed -n 's/^version:=//p' scip-java/build/install/scip-java/VERSION
           )"
           test -n "$SCIP_JAVA_VERSION"
           printf 'SCIP_JAVA_VERSION=%s\n' "$SCIP_JAVA_VERSION" >> "$GITHUB_ENV"
-          printf 'SCIP_JAVA_CLI=%s\n' "$PWD/scip-java/target/pack/bin/scip-java" >> "$GITHUB_ENV"
+          printf 'SCIP_JAVA_CLI=%s\n' "$PWD/scip-java/build/install/scip-java/bin/scip-java" >> "$GITHUB_ENV"
 
       - run: |
           nix develop "$GITHUB_WORKSPACE#jdk${{ matrix.java }}" --command \

.github/workflows/release-cli.yml

@@ -37,7 +37,7 @@ jobs:
           cd "$OUT_DIR"
 
           VERSION=${VERSION#v}
-          ARTIFACT="com.sourcegraph:scip-java_2.13:${VERSION}"
+          ARTIFACT="com.sourcegraph:scip-java:${VERSION}"
 
           for attempt in {1..10}; do
             if cs resolve "$ARTIFACT" >/dev/null 2>&1; then

.github/workflows/release-maven.yml

@@ -15,13 +15,25 @@ jobs:
         with:
           summarize: false
       - uses: DeterminateSystems/magic-nix-cache-action@v13
-      - name: Publish ${{ github.ref }}
-        run: nix develop --command sbt ci-release
+      - name: Publish snapshot ${{ github.ref }}
+        if: ${{ !startsWith(github.ref, 'refs/tags/') }}
+        run: nix develop --command gradle --no-daemon publishToMavenCentral
         env:
-          PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
-          PGP_SECRET: ${{ secrets.PGP_SECRET }}
-          SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
-          SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
+          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.SONATYPE_PASSWORD }}
+          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_USERNAME }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.PGP_SECRET }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.PGP_PASSPHRASE }}
+      - name: Publish release ${{ github.ref }}
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        run: |
+          version="${GITHUB_REF_NAME#v}"
+          nix develop --command gradle --no-daemon \
+            "-PreleaseVersion=$version" publishAndReleaseToMavenCentral
+        env:
+          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.SONATYPE_PASSWORD }}
+          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_USERNAME }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.PGP_SECRET }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.PGP_PASSPHRASE }}
 
   release-cli:
     if: ${{ startsWith(github.ref, 'refs/tags/') }}

.gitignore

@@ -5,16 +5,16 @@
 result
 result-*
 
-# sbt specific
+# build tool output
+.gradle/
+build/
 .cache
 .history
 .lib/
 dist/*
 target/
 lib_managed/
 src_managed/
-project/boot/
-project/plugins/project/
 .bloop
 
 _site/
@@ -79,7 +79,3 @@ scip-snapshots/META-INF/
 # writes META-INF/scip/sources/Test.kt.scip relative to the test
 # cwd.
 scip-kotlinc/META-INF/
-
-# Standard sbt project metadata directories.
-project/target/
-project/project/

CONTRIBUTING.md

@@ -14,8 +14,8 @@ nix develop .#jdk17      # JDK 17
 nix develop .#jdk21      # JDK 21
 ```
 
-This drops you into a shell with `sbt`, `maven`, `gradle`, `bazelisk`,
-`nodejs`, `yarn`, `git`, `jq`, etc. all pinned to the versions used in CI.
+This drops you into a shell with `gradle`, `maven`, `bazelisk`, `nodejs`,
+`yarn`, `git`, `jq`, etc. all pinned to the versions used in CI.
 
 If you'd rather install tools manually, you'll need at least:
 
@@ -43,25 +43,23 @@ These are the main components of the project.
   interface.
 - `scip-java/src/test`: build-tool integration tests and fixtures for the
   `scip-java` command-line interface.
-- `build.sbt`: the sbt build definition.
-- `project/plugins.sbt`: plugins for the sbt build.
+- `settings.gradle.kts`: Gradle project layout.
+- `build.gradle.kts`: Gradle build definition.
+- `gradle/libs.versions.toml`: dependency and plugin versions.
 
 ## Helpful commands
 
-| Command                                                             | Where    | Description                                                                         |
-| ------------------------------------------------------------------- | -------- | ----------------------------------------------------------------------------------- |
-| `sbt`                                                               | terminal | Start interactive sbt shell with Java 11 (run from `nix develop`). Takes a while to load on the first run. |
-| `unit/test`                                                         | sbt      | Run fast unit tests.                                                                |
-| `~unit/test`                                                        | sbt      | Start watch mode to run tests on file save, good for local edit-and-test workflows. |
-| `cli/test`                                                          | sbt      | Run slow build tool tests (Gradle, Maven).                                          |
-| `snapshots/testOnly tests.MinimizedSnapshotScipTest`                | sbt      | Runs fast snapshot tests. Indexes a small set of files under `tests/minimized`.     |
-| `snapshots/test`                                                    | sbt      | Runs all snapshot tests.                                                            |
-| `snapshots/run`                                                     | sbt      | Update only the Java snapshot goldens under `tests/snapshots`.                      |
-| `scipKotlincMinimized/kotlincSnapshots`                             | sbt      | Update only the Kotlin snapshot goldens under `scip-kotlinc/minimized`.             |
-| `regenerateSnapshots`                                               | sbt      | Regenerate ALL snapshot goldens (Java + Kotlin). Run after fixing a bug.            |
-| `cli/run --cwd DIRECTORY`                                           | sbt      | Run `scip-java` command-line tool against a given Gradle/Maven build.               |
-| `google-java-format --replace $(git ls-files '*.java')`             | terminal | Format Java sources (from `nix develop`). Enforced by `nix flake check`.            |
-| `ktfmt --kotlinlang-style $(git ls-files '*.kt')`                   | terminal | Format Kotlin sources (from `nix develop`). Enforced by `nix flake check`.          |
+| Command                                                 | Where    | Description                                                             |
+| ------------------------------------------------------- | -------- | ----------------------------------------------------------------------- |
+| `gradle test --no-daemon`                               | terminal | Run all Gradle tests.                                                    |
+| `gradle :scip-java:test --no-daemon`                    | terminal | Run CLI build-tool integration tests (Gradle, Maven, SCIP config).       |
+| `gradle :scip-kotlinc:test --no-daemon`                 | terminal | Run Kotlin compiler-plugin tests.                                        |
+| `gradle :scip-snapshots:test --no-daemon`               | terminal | Compare Java and Kotlin snapshot goldens.                                |
+| `gradle :scip-snapshots:saveSnapshots --no-daemon`      | terminal | Regenerate Java and Kotlin snapshot goldens.                             |
+| `gradle :scip-java:installDist --no-daemon`             | terminal | Build a local `scip-java` distribution under `scip-java/build/install/`. |
+| `gradle :scip-java:run --args='--cwd DIRECTORY'`        | terminal | Run `scip-java` against a given Gradle/Maven build.                      |
+| `google-java-format --replace $(git ls-files '*.java')` | terminal | Format Java sources (from `nix develop`). Enforced by `nix flake check`. |
+| `ktfmt --kotlinlang-style $(git ls-files '*.kt')`       | terminal | Format Kotlin sources (from `nix develop`). Enforced by `nix flake check`. |
 
 ## Import the project into IntelliJ
 
@@ -80,20 +78,16 @@ Next, follow
 [these instructions](https://github.com/HPI-Information-Systems/Metanome/wiki/Installing-the-google-styleguide-settings-in-intellij-and-eclipse)
 here to configure the Google Java formatter.
 
-Finally, run "File > Project From Existing Sources" to import the sbt build into
-IntelliJ. Select the "sbt" option if it asks you to choose between
-sbt/BSP/Bloop.
+Finally, run "File > Project From Existing Sources" to import the Gradle build
+into IntelliJ. Select the "Gradle" option if it asks you to choose a build
+model.
 
-It's best to run tests from the sbt shell, not from the IntelliJ UI.
+It's best to run tests from Gradle, not from the IntelliJ UI.
 
 ## Tests are written in Java with JUnit 5
 
-The unit tests (`tests/unit`) and snapshot tests (`tests/snapshots`) are plain
-Java using [JUnit 5](https://junit.org/junit5/), wired into sbt via
-[sbt-jupiter-interface](https://github.com/sbt/sbt-jupiter-interface). The
-snapshot suite is a JUnit `@TestFactory` that emits one dynamic test per
-generated document, comparing it against the committed goldens under
-`tests/snapshots/src/main/generated`
-([snapshot testing](https://jestjs.io/docs/en/snapshot-testing) is heavily used
-in this codebase). Build-tool tests (`scip-java/src/test`) are written in
-Kotlin.
+The Java tests use [JUnit 5](https://junit.org/junit5/) through Gradle's JUnit
+Platform support. The snapshot suite is a JUnit `@TestFactory` that emits one
+dynamic test per generated document, comparing it against the committed goldens
+under `scip-snapshots/expected`. Build-tool tests (`scip-java/src/test`) are
+written in Kotlin.

Dockerfile

@@ -17,7 +17,7 @@ RUN git config --global --add safe.directory *
 
 COPY . .
 
-RUN sbt cli/pack && mkdir -p /app/scip-java && cp -R scip-java/target/pack/. /app/scip-java/
+RUN gradle --no-daemon :scip-java:installDist && mkdir -p /app/scip-java && cp -R scip-java/build/install/scip-java/. /app/scip-java/
 
 COPY ./bin/scip-java-docker-script.sh /usr/bin/scip-java
 

bin/docker-setup.sh

@@ -3,14 +3,14 @@ set -eux
 curl -fLo /usr/local/bin/cs https://github.com/coursier/coursier/releases/download/v2.1.5/coursier
 chmod +x /usr/local/bin/cs
 ln -sf /usr/local/bin/cs /usr/local/bin/coursier
-cs setup --yes --apps cs,coursier,sbt
+cs setup --yes --apps cs,coursier
 
 curl -fLo maven.zip https://archive.apache.org/dist/maven/maven-3/3.9.1/binaries/apache-maven-3.9.1-bin.zip 
 unzip -d /opt/maven maven.zip
 rm maven.zip
 mv /opt/maven/*/* /opt/maven
 
-curl -fLo gradle.zip https://services.gradle.org/distributions/gradle-7.6.1-bin.zip
+curl -fLo gradle.zip https://services.gradle.org/distributions/gradle-8.14.4-bin.zip
 unzip -d /opt/gradle gradle.zip 
 rm gradle.zip
 mv /opt/gradle/*/* /opt/gradle