From b51ec1c32c4bcf30d4f83744944df889a89da70b Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Mon, 8 Jul 2019 13:26:45 -0400
Subject: added clearing of recently used docs.

---
 src/new_fields/Doc.ts | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/new_fields/Doc.ts')

diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 092205f52..aa13b1d7a 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -9,6 +9,7 @@ import { ObjectField } from "./ObjectField";
 import { RefField, FieldId } from "./RefField";
 import { ToScriptString, SelfProxy, Parent, OnUpdate, Self, HandleUpdate, Update, Id } from "./FieldSymbols";
 import { scriptingGlobal } from "../client/util/Scripting";
+import { List } from "./List";
 
 export namespace Field {
     export function toScriptString(field: Field): string {
@@ -241,9 +242,18 @@ export namespace Doc {
         return Array.from(results);
     }
 
-    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean, first?: boolean) {
+    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean, first?: boolean, allowDuplicates?: boolean) {
+        if (target[key] === undefined) {
+            Doc.GetProto(target)[key] = new List<Doc>();
+        }
         let list = Cast(target[key], listSpec(Doc));
         if (list) {
+            if (allowDuplicates !== true) {
+                let pind = list.reduce((l, d, i) => d instanceof Doc && Doc.AreProtosEqual(d, doc) ? i : l, -1);
+                if (pind !== -1) {
+                    list.splice(pind, 1);
+                }
+            }
             if (first) list.splice(0, 0, doc);
             else {
                 let ind = relativeTo ? list.indexOf(relativeTo) : -1;
-- 
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