Add lsif-java command-line tool with Gradle and Maven support.

.devcontainer/Dockerfile

@@ -0,0 +1,12 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.158.0/containers/ubuntu/.devcontainer/base.Dockerfile
+
+# [Choice] Ubuntu version: bionic, focal
+ARG VARIANT="focal"
+FROM mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
+
+# [Optional] Uncomment this section to install additional OS packages.
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends default-jdk gradle maven golang-go \
+    && go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb
+
+

.devcontainer/devcontainer.json

@@ -0,0 +1,27 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.158.0/containers/ubuntu
+{
+	"name": "Ubuntu",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick an Ubuntu version: focal, bionic
+		"args": { "VARIANT": "focal" }
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": { 
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.github/workflows/ci.yml

@@ -10,14 +10,14 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: olafurpg/setup-scala@v10
+      - uses: actions/setup-go@v2
         with:
-          java-version: [email protected]
+          go-version: '^1.13.1'
+      - run: go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb
       - run: sbt test
   check:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: olafurpg/setup-scala@v10
-        with:
-          java-version: [email protected]
       - run: sbt checkAll

.github/workflows/native.yml

@@ -0,0 +1,58 @@
+name: Native Image
+on:
+  push:
+    branches:
+      - master
+  release:
+    types: [published]
+jobs:
+  unix:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macOS-latest, ubuntu-latest, windows-latest]
+        include:
+          - os: macOS-latest
+            uploaded_filename: lsif-java-x86_64-apple-darwin
+            local_path: lsif-java/target/native-image/lsif-java
+          - os: ubuntu-latest
+            uploaded_filename: lsif-java-x86_64-pc-linux
+            local_path: lsif-java/target/native-image/lsif-java
+          - os: windows-latest
+            uploaded_filename: lsif-java-x86_64-pc-win32.exe
+            local_path: lsif-java\target\native-image\lsif-java.exe
+    steps:
+      - uses: actions/checkout@v2
+      - uses: olafurpg/setup-scala@v10
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '^1.13.1'
+      - run: go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb
+      - run: git fetch --tags || true
+      - name: sbt nativeImage
+        shell: bash
+        if: ${{ matrix.os != 'windows-latest' }}
+        run: |
+          sbt cli/nativeImage "cli/nativeImageRun --cwd tests/gradle-example"
+      - name: sbt nativeImage
+        shell: cmd
+        if: ${{ matrix.os == 'windows-latest' }}
+        run: >-
+          "C:\Program Files (x86)\Microsoft Visual
+          Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat" && sbt
+          cli/nativeImage
+      - uses: actions/upload-artifact@master
+        with:
+          path: ${{ matrix.local_path }}
+          name: ${{ matrix.uploaded_filename }}
+      - name: Upload release
+        if: github.event_name == 'release'
+        uses: actions/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ github.event.release.upload_url }}
+          asset_path: ${{ matrix.local_path }}
+          asset_name: ${{ matrix.uploaded_filename }}
+          asset_content_type: application/zip

README.md

@@ -13,17 +13,24 @@ Currently, only Java 8 with the build tool sbt is supported. We hope to increase
 compatibility with more Java language versions and build tools as the project
 evolves.
 
-| Language version | Support |
-| ---------------- | ------- |
-| Java 7           | ❌      |
-| Java 8           | ✅      |
-| Java 11+         | ❌      |
+| Language version | Support                           |
+| ---------------- | --------------------------------- |
+| Java 7           | ❌                                |
+| Java 8           | ✅                                |
+| Java 11          | ✅                                |
+| Java 12          | Not tested in CI, but should work |
+| Java 13          | Not tested in CI, but should work |
+| Java 14          | Not tested in CI, but should work |
+| Java 15          | ✅                                |
+| Java 16          | Not tested in CI, but should work |
+| Java 17          | Not tested in CI, but should work |
 
 | Build tool | Support |
 | ---------- | ------- |
-| Gradle     | ❌      |
-| Maven      | ❌      |
+| Gradle     | ✅      |
+| Maven      | ✅      |
 | Bazel      | ❌      |
+| Buck       | ❌      |
 | sbt        | ✅      |
 
 ## Overview
@@ -82,6 +89,17 @@ using SemanticDB as an intermediary representation for LSIF:
 
 The following sections provide tips on how to contribute to this codebase.
 
+### System dependencies
+
+- `java`: any version should work
+- `git`: any version should work
+- `lsif-semanticdb`:
+  `go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb`
+- `gradle`: `brew install gradle`, or see
+  [general installation guide](https://gradle.org/install/).
+- `mvn`: `brew install maven`, or see
+  [general installation guide](https://www.baeldung.com/install-maven-on-windows-linux-mac).
+
 ### Project structure
 
 These are the main components of the project.
@@ -100,17 +118,19 @@ These are the main components of the project.
 
 ### Helpful commands
 
-| Command                                                            | Where    | Description                                                                         |
-| ------------------------------------------------------------------ | -------- | ----------------------------------------------------------------------------------- |
-| `./sbt`                                                            | terminal | Start interactive sbt shell with Java 8. 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. |
+| Command                                                             | Where    | Description                                                                         |
+| ------------------------------------------------------------------- | -------- | ----------------------------------------------------------------------------------- |
+| `./sbt`                                                             | terminal | Start interactive sbt shell with Java 11. 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. |
+| `buildTools/test`                                                   | sbt      | Run slow build tool tests (Gradle, Maven).                                          |
 | `snapshots/testOnly tests.MinimizedSnapshotSuite`                   | sbt      | Runs fast snapshot tests. Indexes a small set of files under `tests/minimized`.     |
 | `snapshots/testOnly tests.MinimizedSnapshotSuite -- *InnerClasses*` | sbt      | Runs only individual tests cases matching the name "InnerClasses".                  |
 | `snapshots/testOnly tests.LibrarySnapshotSuite`                     | sbt      | Runs slow snapshot tests. Indexes a corpus of external Java libraries.              |
 | `snapshots/test`                                                    | sbt      | Runs all snapshot tests.                                                            |
 | `snapshots/run`                                                     | sbt      | Update snapshot tests. Use this command after you have fixed a bug.                 |
-| `fixAll`                                                           | sbt      | Run Scalafmt, Scalafix and Javafmt on all sources. Run this before opening a PR.    |
+| `cli/run --cwd DIRECTORY`                                           | sbt      | Run `lsif-java` command-line tool against a given Gradle/Maven build.               |
+| `fixAll`                                                            | sbt      | Run Scalafmt, Scalafix and Javafmt on all sources. Run this before opening a PR.    |
 
 ### Import the project into IntelliJ