[IJ Plugin] Rover: always pass path to supergraph.yaml if present

intellij-plugin/src/main/kotlin/com/apollographql/ijplugin/lsp/ApolloLspAppService.kt

@@ -12,6 +12,10 @@ import com.intellij.openapi.application.runWriteAction
 import com.intellij.openapi.components.Service
 import com.intellij.openapi.fileTypes.ex.FileTypeManagerEx
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.project.guessProjectDir
+import com.intellij.openapi.vfs.VirtualFileManager
+import com.intellij.openapi.vfs.newvfs.BulkFileListener
+import com.intellij.openapi.vfs.newvfs.events.VFileEvent
 import com.intellij.util.application
 
 @Service(Service.Level.APP)
@@ -49,6 +53,7 @@ class ApolloLspProjectService(private val project: Project) : Disposable {
   init {
     logd()
     startObserveSettings()
+    startObserveVfsChanges()
   }
 
   private fun startObserveSettings() {
@@ -76,6 +81,22 @@ class ApolloLspProjectService(private val project: Project) : Disposable {
     })
   }
 
+  private fun startObserveVfsChanges() {
+    project.messageBus.connect(this).subscribe(VirtualFileManager.VFS_CHANGES, object : BulkFileListener {
+      override fun after(events: MutableList<out VFileEvent>) {
+        for (event in events) {
+          val vFile = event.file!!
+          val isSupergraphYaml = vFile == project.guessProjectDir()?.findChild("supergraph.yaml") ||
+              vFile.path == project.projectSettingsState.lspPathToSuperGraphYaml
+          if (isSupergraphYaml) {
+            logd("supergraph.yaml changed: restarting Apollo LSP")
+            restartApolloLsp()
+          }
+        }
+      }
+    })
+  }
+
   override fun dispose() {
     logd()
   }

intellij-plugin/src/main/kotlin/com/apollographql/ijplugin/rover/RoverHelper.kt

@@ -5,7 +5,9 @@ import com.intellij.execution.configurations.GeneralCommandLine
 import com.intellij.execution.processTools.getResultStdoutStr
 import com.intellij.execution.processTools.mapFlat
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.project.guessProjectDir
 import kotlinx.coroutines.runBlocking
+import java.io.File
 
 object RoverHelper {
   private fun getRoverBinDirectory() = "${System.getProperty("user.home")}/.rover/bin"
@@ -20,9 +22,18 @@ object RoverHelper {
       setWorkDirectory(getRoverBinDirectory())
       getEnvironment().put("RUST_BACKTRACE", "full")
       addParameter("lsp")
-      if (project.projectSettingsState.lspPassPathToSuperGraphYaml && project.projectSettingsState.lspPathToSuperGraphYaml.isNotBlank()) {
+      if (project.projectSettingsState.lspPassPathToSuperGraphYaml &&
+          project.projectSettingsState.lspPathToSuperGraphYaml.isNotBlank() &&
+          File(project.projectSettingsState.lspPathToSuperGraphYaml).exists()
+      ) {
         addParameter("--supergraph-config")
         addParameter(project.projectSettingsState.lspPathToSuperGraphYaml)
+      } else {
+        val superGraphYamlFilePath = project.guessProjectDir()?.findChild("supergraph.yaml")?.path
+        if (superGraphYamlFilePath != null) {
+          addParameter("--supergraph-config")
+          addParameter(superGraphYamlFilePath)
+        }
       }
       if (project.projectSettingsState.lspPassAdditionalArguments && project.projectSettingsState.lspAdditionalArguments.isNotBlank()) {
         addParameters(project.projectSettingsState.lspAdditionalArguments.split(' '))

intellij-plugin/src/main/kotlin/com/apollographql/ijplugin/settings/ProjectSettingsService.kt

@@ -132,6 +132,7 @@ class ProjectSettingsService(private val project: Project) : PersistentStateComp
         val superGraphYamlFilePath = project.guessProjectDir()?.findChild("supergraph.yaml")?.path
         if (superGraphYamlFilePath != null) {
           lspPathToSuperGraphYaml = superGraphYamlFilePath
+          lspPassPathToSuperGraphYaml = true
         } else {
           lspPassPathToSuperGraphYaml = false
         }