[ijent] IJPL-232220 encode windows drive root as two-segment path

GitOrigin-RevId: 6f43db4cd3d6903c8144a621acded43504535929

platform/eel-provider/src/com/intellij/platform/eel/provider/EelNioBridgeService.kt

@@ -6,6 +6,7 @@ import com.intellij.openapi.diagnostic.logger
 import com.intellij.openapi.diagnostic.trace
 import com.intellij.openapi.project.Project
 import com.intellij.platform.eel.EelDescriptor
+import com.intellij.platform.eel.EelOsFamily
 import com.intellij.platform.eel.EelPathBoundDescriptor
 import com.intellij.platform.eel.annotations.MultiRoutingFileSystemPath
 import com.intellij.platform.eel.isPosix
@@ -43,6 +44,8 @@ fun EelPath.asNioPath(project: Project?): @MultiRoutingFileSystemPath Path {
   return asNioPath()
 }
 
+private val WINDOWS_DRIVE_PREFIX_REGEX = Regex("^\\w:")
+
 /** See docs for [asNioPath] */
 @Deprecated("It never returns null anymore")
 @ApiStatus.Experimental
@@ -63,7 +66,17 @@ fun EelPath.asNioPathOrNull(): @MultiRoutingFileSystemPath Path? {
   }
 
   @MultiRoutingFileSystemPath
-  val result = parts.fold(root, Path::resolve)
+  val result = when (descriptor.osFamily) {
+    EelOsFamily.Windows -> {
+      if (WINDOWS_DRIVE_PREFIX_REGEX.containsMatchIn(this.root.toString())) {
+        (listOf("@", this.root.toString().take(1)) + parts).fold(root, Path::resolve)
+      }
+      else {
+        parts.fold(root, Path::resolve)
+      }
+    }
+    EelOsFamily.Posix -> parts.fold(root, Path::resolve)
+  }
   LOG.trace {
     "asNioPathOrNull(): path=$this basePath=$root result=$result"
   }

platform/eel-tcp/src/TcpEelMrfsBackend.kt

@@ -14,6 +14,7 @@ import java.nio.file.FileSystem
 import java.nio.file.FileSystemAlreadyExistsException
 import java.nio.file.Files
 import java.util.concurrent.ConcurrentHashMap
+import kotlin.io.path.pathString
 
 
 class TcpEelMrfsBackend(private val scope: CoroutineScope) : MultiRoutingFileSystemBackend {
@@ -57,7 +58,7 @@ class TcpEelMrfsBackend(private val scope: CoroutineScope) : MultiRoutingFileSys
   }
 
   override fun getCustomRoots(): Collection<@MultiRoutingFileSystemPath String> {
-    return cache.keys.map { "${TcpEelConstants.TCP_PATH_PREFIX}$it" }
+    return cache.values.flatMap { it.rootDirectories }.map { it.pathString }
   }
 
   override fun getCustomFileStores(localFS: FileSystem): Collection<FileStore> {

platform/ijent/impl/src/com/intellij/platform/ijent/community/impl/nio/fs/IjentEphemeralRootAwareFileSystem.kt

@@ -269,7 +269,7 @@ class IjentEphemeralRootAwareFileSystemProvider(
     return ijentFsProvider
   }
 
-  override fun wrapDelegatePath(delegatePath: Path?): Path? {
+  public override fun wrapDelegatePath(delegatePath: Path?): Path? {
     if (delegatePath == null) return null
 
     if (delegatePath is IjentNioPath) {
@@ -341,7 +341,11 @@ class IjentEphemeralRootAwareFileSystem(
   }
 
   override fun getRootDirectories(): Iterable<Path?> {
-    return if (useRootDirectoriesFromOriginalFs) originalFs.rootDirectories else listOf(Path(root.pathString))
+    return if (useRootDirectoriesFromOriginalFs) {
+      originalFs.rootDirectories
+    } else {
+      ijentFs.rootDirectories.map { rootAwareFileSystemProvider.wrapDelegatePath(it) }
+    }
   }
 
   override fun close() {
@@ -397,7 +401,12 @@ class IjentEphemeralRootAwareFileSystem(
       }
       EelOsFamily.Windows -> {
         if (relativePath != null) {
-          arrayOf(relativePath.removePrefix("/"), *parts)
+          if (relativePath.startsWith("/@/")) {
+            arrayOf("${relativePath[3]}:${relativePath.drop(4)}", *parts)
+          }
+          else {
+            arrayOf(relativePath.removePrefix("/"), *parts)
+          }
         }
         else parts
       }