catchup feed

ttrss/ApiClient.cs

@@ -545,10 +545,40 @@ namespace ttrss_co_client.ttrss
             }
         }
         public enum CATCHUPMODE { All, OneDay, OneWeek, TwoWeeks }
-        public async Task CatchupFeed(int feed_id, bool is_cat, CATCHUPMODE mode = CATCHUPMODE.All)
+        ///<summary>Tries to catchup (e.g. mark as read) specified feed.</summary>
+        public async Task<bool> CatchupFeed(int feed_id, bool is_cat, CATCHUPMODE mode = CATCHUPMODE.All)
         {
             assertInitialized();
-            throw new NotImplementedException();
+
+            var modestring = "all";
+            if(mode != CATCHUPMODE.All)
+            {
+                assertApiLevel(15);
+                switch (mode)
+                {
+                    case CATCHUPMODE.OneDay:
+                        modestring = "1day";
+                        break;
+                    case CATCHUPMODE.OneWeek:
+                        modestring = "1week";
+                        break;
+                    case CATCHUPMODE.TwoWeeks:
+                        modestring = "2week";
+                        break;
+                }
+            }
+
+            var json = JsonContent.Create(new
+            {
+                op = "catchupFeed",
+                sid = this.SessionId,
+                feed_id = feed_id,
+                is_cat = is_cat,
+                mode = modestring
+            });
+            var apiResponse = await get<Dictionary<string, string>>(json);
+            
+            return apiResponse.ContainsKey("status") && apiResponse["status"]?.ToLower() == "ok";
         }
         public async Task GetLabels(int? article_id)
         {