fix(tooling-api): remove usage of hardcoded root project path

subprojects/projects/src/main/java/com/itsaky/androidide/projects/util/ProjectTransformer.kt

@@ -45,9 +45,9 @@ class ProjectTransformer {
   fun transform(project: IProject): Project? {
     try {
       val allProjects = project.getProjects().get()
-      val selectionResult = project.selectProject(StringParameter(IProject.ROOT_PROJECT_PATH)).get()
+      val selectionResult = project.selectProject(StringParameter("")).get()
       check(selectionResult.isSuccessful) {
-        "Cannot find root project with path '${IProject.ROOT_PROJECT_PATH}'"
+        "Cannot find root project"
       }
 
       val rootProject = when (project.getType().get()) {

subprojects/tooling-api-impl/src/main/java/com/itsaky/androidide/tooling/impl/ToolingApiServerImpl.kt

@@ -148,7 +148,11 @@ internal class ToolingApiServerImpl(private val project: ProjectImpl) :
 
       var projectPath = message.projectPath
       if (projectPath == null) {
-        projectPath = IProject.ROOT_PROJECT_PATH
+        projectPath = project.rootProjectPath
+      }
+
+      checkNotNull(projectPath) {
+        "Unable to determine root project path"
       }
 
       val project = this.project.run {

subprojects/tooling-api-impl/src/main/java/com/itsaky/androidide/tooling/impl/internal/ProjectImpl.kt

@@ -34,8 +34,11 @@ import java.util.concurrent.CompletableFuture
  * @author Akash Yadav
  */
 @Suppress("JoinDeclarationAndAssignment")
-internal class ProjectImpl(var rootProject: IGradleProject? = null,
-  var projects: List<IGradleProject> = emptyList()) : IProject, Serializable {
+internal class ProjectImpl(
+  var rootProject: IGradleProject? = null,
+  var rootProjectPath: String? = null,
+  var projects: List<IGradleProject> = emptyList()
+) : IProject, Serializable {
 
   private val serialVersionUID = 1L
 
@@ -48,11 +51,14 @@ internal class ProjectImpl(var rootProject: IGradleProject? = null,
   private val selectedProject: ForwardingProject
 
   init {
+    require((rootProject == null) == (rootProjectPath == null)) {
+      "rootProject, rootProjectPath: both must be specified or null"
+    }
     this.selectedProject = ForwardingProject()
   }
 
   private fun getProject(path: String): IGradleProject? {
-    return if (IProject.ROOT_PROJECT_PATH == path) rootProject else projects.find {
+    return if (path.isBlank()) rootProject else projects.find {
       it.getMetadata().get().projectPath == path
     }
   }

subprojects/tooling-api-impl/src/main/java/com/itsaky/androidide/tooling/impl/sync/RootModelBuilder.kt

@@ -49,9 +49,9 @@ class RootModelBuilder(initializationParams: InitializeProjectParams) :
 
       val ideaModules = ideaProject.modules
       val modulePaths = mapOf(*ideaModules.map { it.name to it.gradleProject.path }.toTypedArray())
-      val rootModule = ideaModules.find { it.gradleProject.path == IProject.ROOT_PROJECT_PATH }
+      val rootModule = ideaModules.find { it.gradleProject.parent == null }
         ?: throw ModelBuilderException(
-          "No GradleProject model is associated with project path: '${IProject.ROOT_PROJECT_PATH}'")
+          "Unable to find root project")
 
       val rootProjectVersions = getAndroidVersions(rootModule, controller)
 
@@ -68,7 +68,7 @@ class RootModelBuilder(initializationParams: InitializeProjectParams) :
           ModuleProjectModelBuilderParams(controller, ideaProject, ideaModule, modulePaths))
       }
 
-      return@action ProjectImpl(rootProject, projects)
+      return@action ProjectImpl(rootProject, rootModule.gradleProject.path, projects)
     }
 
     finalizeLauncher(executor)

subprojects/tooling-api-impl/src/test/java/com/itsaky/androidide/tooling/impl/MultiModuleAndroidProjectTest.kt

@@ -118,7 +118,7 @@ class MultiModuleAndroidProjectTest {
     val isInitialized = server.isServerInitialized().get()
     assertThat(isInitialized).isTrue()
 
-    var selectionResult = project.selectProject(StringParameter(IProject.ROOT_PROJECT_PATH)).get()
+    var selectionResult = project.selectProject(StringParameter("")).get()
     assertThat(selectionResult.isSuccessful).isTrue()
     assertThat(project.getType().get()).isEqualTo(ProjectType.Gradle)
 

subprojects/tooling-api-model/src/main/java/com/itsaky/androidide/tooling/api/IProject.kt

@@ -47,11 +47,6 @@ interface IProject : IProjectQueries {
 
   companion object {
 
-    /**
-     * Gradle project path for the root project.
-     */
-    const val ROOT_PROJECT_PATH = ":"
-
     /**
      * Name that can be used for project whose [BasicProjectMetadata.name] property is null.
      */

subprojects/tooling-api-model/src/main/java/com/itsaky/androidide/tooling/api/IProjectQueries.kt

@@ -50,7 +50,7 @@ interface IProjectQueries {
   /**
    * Select the project to work with. This overwrites the existing selection.
    *
-   * @param param A [StringParameter] with the project's path as the value.
+   * @param param A [StringParameter] with the project's path as the value. If the value is an empty string, the root project will be selected.
    */
   @JsonRequest
   fun selectProject(param: StringParameter): CompletableFuture<SelectProjectResult>