Drop ScipBuildTool and related code

Removes the SCIP-specific build tool that consumed scip-java.json /
lsif-java.json config files, along with everything that only existed to
support it:

- ScipBuildTool and its test suite
- IndexDependencyCommand (only invoked the dropped 'scip' build tool)
- LibrarySnapshotGenerator + SemanticdbJavacSnapshotGenerator and the
  org.jetbrains.exposed snapshot fixtures (the generator only worked via
  index-dependency)
- TracingServer test helper (only used by ScipBuildToolSuite)
- Dependencies.kotlinMPPCommon (only used by ScipBuildTool)
- The scipConfig / scipIgnoredJavacOptionPrefixes /
  scipIgnoredAnnotationProcessors CLI flags
- The lsif-java.json JVM lookup in scip-java-docker-script.sh, and the
  now-unused jq install (Dockerfile, flake.nix, CONTRIBUTING.md)

Also fixes a pre-existing misplaced @description annotation in
IndexCommand so that the buildCommand description is actually attached
to buildCommand instead of leaking onto strictCompilation.

Author: jupblb

CONTRIBUTING.md

@@ -15,7 +15,7 @@ nix develop .#jdk21      # JDK 21
 ```
 
 This drops you into a shell with `sbt`, `cs` (coursier), `maven`, `gradle`,
-`bazelisk`, `scalafmt`, `nodejs`, `yarn`, `git`, `jq`, etc. all pinned to the
+`bazelisk`, `scalafmt`, `nodejs`, `yarn`, `git`, etc. all pinned to the
 versions used in CI.
 
 If you'd rather install tools manually, you'll need at least:
@@ -55,7 +55,6 @@ These are the main components of the project.
 | `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.                 |
 | `cli/run --cwd DIRECTORY`                                           | sbt      | Run `scip-java` command-line tool against a given Gradle/Maven build.               |

Dockerfile

@@ -1,6 +1,6 @@
 FROM eclipse-temurin:17@sha256:6eca72bb4cd5fb8cd215f2579a4dfffd24b0f47effb6c868b7e92b7f0422fa9f
 
-RUN apt-get update && apt-get install --yes jq wget curl zip unzip git python3 python3-pip autoconf automake libtool build-essential libtool make g++
+RUN apt-get update && apt-get install --yes wget curl zip unzip git python3 python3-pip autoconf automake libtool build-essential libtool make g++
 
 WORKDIR /workdir
 

bin/scip-java-docker-script.sh

@@ -4,13 +4,6 @@
 # `scip-java` binary is already installed at `/app/scip-java/bin/scip-java`.
 set -eu
 JVM_VERSION="${JVM_VERSION:-21,17,11,8}"
-FILE="$PWD/lsif-java.json"
-if test -f "$FILE"; then
-	FROM_CONFIG=$(jq -r '.jvm' "$FILE")
-	if [ "$FROM_CONFIG" != "null" ]; then
-		JVM_VERSION="$FROM_CONFIG"
-	fi
-fi
 
 JVM_VERSIONS=$(echo "$JVM_VERSION" | tr "," "\n")
 

flake.nix

@@ -27,7 +27,6 @@
               git
               (gradle.override ({ java = jdk; }))
               jdk
-              jq
               (maven.override ({ jdk_headless = jdk; }))
               nixfmt
               nodejs

scip-java/src/main/scala/com/sourcegraph/scip_java/Dependencies.scala

@@ -4,13 +4,11 @@ import java.io.File
 import java.nio.file.Path
 
 import scala.concurrent.duration.Duration
-import scala.util.Try
 import scala.xml.XML
 
 import coursier.Fetch
 import coursier.Repositories
 import coursier.Resolve
-import coursier.cache.Cache
 import coursier.cache.CachePolicy
 import coursier.cache.FileCache
 import coursier.core._
@@ -43,39 +41,6 @@ object Dependencies {
     Repositories.centralGcs
   )
 
-  /**
-   * Attempts to find the "common definitions" JAR for a potentially
-   * MultiPlatform Project. We only support JVM for now, native and JS are not
-   * supported. If it ends with '-jvm', we search for a JAR with the classifier
-   * truncated. If it does not end with -jvm, we search for a JAR with the
-   * -common classifier. This is non-exhaustive, and the classifiers are
-   * completely arbitrary.
-   */
-  def kotlinMPPCommon(
-      group: String,
-      artifact: String,
-      version: String
-  ): Option[Path] =
-    Try {
-      val task = Fetch[Task](Cache.default)
-        .withClassifiers(Set(Classifier.sources))
-        .addRepositories(defaultExtraRepositories: _*)
-
-      if (artifact.endsWith("-jvm")) {
-        val dependency = Dependencies.parseDependency(
-          s"$group:${artifact.stripSuffix("-jvm")}:$version"
-        )
-        val result = task.addDependencies(dependency).runResult()
-        return Some(result.files.head.toPath)
-      }
-
-      val dependency = Dependencies.parseDependency(
-        s"$group:$artifact-common:$version"
-      )
-      val result = task.addDependencies(dependency).runResult()
-      result.files.head.toPath
-    }.toOption
-
   def resolveDependencies(
       dependencies: List[String],
       transitive: Boolean = true

scip-java/src/main/scala/com/sourcegraph/scip_java/ScipJava.scala

@@ -3,7 +3,6 @@ package com.sourcegraph.scip_java
 import java.io.PrintStream
 
 import com.sourcegraph.scip_java.commands.IndexCommand
-import com.sourcegraph.scip_java.commands.IndexDependencyCommand
 import com.sourcegraph.scip_java.commands.IndexSemanticdbCommand
 import com.sourcegraph.scip_java.commands.SnapshotCommand
 import moped.cli.Application
@@ -21,7 +20,6 @@ object ScipJava {
       CommandParser[VersionCommand],
       CommandParser[IndexCommand],
       CommandParser[IndexSemanticdbCommand],
-      CommandParser[IndexDependencyCommand],
       CommandParser[SnapshotCommand]
     )
   )

scip-java/src/main/scala/com/sourcegraph/scip_java/buildtools/BuildTool.scala

@@ -27,8 +27,6 @@ object BuildTool {
     // first detected build tool will be used in `auto` mode
     // Bazel is missing because it isn't supported by auto-indexing
 
-    // first as it indicates user's intent to use SCIP auto-indexing
-    new ScipBuildTool(index),
     // Maven first, then Gradle
     // To match the order indicated in IntelliJ Java developer survey 2022:
     // https://www.jetbrains.com/lp/devecosystem-2022/java/#which-build-systems-do-you-regularly-use-if-any-