Add LanguageClientProgress.Factory

Author: fwcd

server/src/main/kotlin/org/javacs/kt/progress/LanguageClientProgress.kt

@@ -7,6 +7,9 @@ import org.eclipse.lsp4j.WorkDoneProgressNotification
 import org.eclipse.lsp4j.WorkDoneProgressBegin
 import org.eclipse.lsp4j.WorkDoneProgressReport
 import org.eclipse.lsp4j.WorkDoneProgressEnd
+import org.eclipse.lsp4j.WorkDoneProgressCreateParams
+import java.util.concurrent.CompletableFuture
+import java.util.UUID
 
 class LanguageClientProgress(
     private val label: String,
@@ -34,4 +37,15 @@ class LanguageClientProgress(
     private fun reportProgress(notification: WorkDoneProgressNotification) {
         client.notifyProgress(ProgressParams(token, notification))
     }
+
+    class Factory(private val client: LanguageClient) : Progress.Factory {
+        override fun create(label: String): CompletableFuture<Progress> {
+            val token = Either.forLeft<String, Number>(UUID.randomUUID().toString())
+            return client
+                .createProgress(WorkDoneProgressCreateParams().also {
+                    it.token = token
+                })
+                .thenApply { LanguageClientProgress(label, token, client) }
+        }
+    }
 }