From 7271fdf6b72d78329273229f9602806ad7b13b78 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Fri, 4 May 2018 19:53:54 -0400
Subject: [PATCH] Add Zotero.Sync.Runner.delayIndefinite()

Delays syncing until the returned function is run
---
 .../content/zotero/xpcom/sync/syncRunner.js   | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/chrome/content/zotero/xpcom/sync/syncRunner.js b/chrome/content/zotero/xpcom/sync/syncRunner.js
index 1b4a5e48d..e6e3b5083 100644
--- a/chrome/content/zotero/xpcom/sync/syncRunner.js
+++ b/chrome/content/zotero/xpcom/sync/syncRunner.js
@@ -70,6 +70,7 @@ Zotero.Sync.Runner_Module = function (options = {}) {
 	var _enabled = false;
 	var _autoSyncTimer;
 	var _delaySyncUntil;
+	var _delayPromises = [];
 	var _firstInSession = true;
 	var _syncInProgress = false;
 	var _stopping = false;
@@ -148,6 +149,21 @@ Zotero.Sync.Runner_Module = function (options = {}) {
 				yield Zotero.Promise.delay(delay);
 			}
 			
+			// If paused, wait until we're done
+			while (true) {
+				if (_delayPromises.some(p => p.isPending())) {
+					this.setSyncStatus(Zotero.getString('sync.status.waiting'));
+					Zotero.debug("Syncing is paused -- waiting to sync");
+					yield Zotero.Promise.all(_delayPromises);
+					// If more were added, continue
+					if (_delayPromises.some(p => p.isPending())) {
+						continue;
+					}
+					_delayPromises = [];
+				}
+				break;
+			}
+			
 			// purgeDataObjects() starts a transaction, so if there's an active one then show a
 			// nice message and wait until there's not. Another transaction could still start
 			// before purgeDataObjects() and result in a wait timeout, but this should reduce the
@@ -958,6 +974,21 @@ Zotero.Sync.Runner_Module = function (options = {}) {
 	};
 	
 	
+	/**
+	 * Delay syncs until the returned function is called
+	 *
+	 * @return {Function} - Resolve function
+	 */
+	this.delayIndefinite = function () {
+		var resolve;
+		var promise = new Zotero.Promise(function () {
+			resolve = arguments[0];
+		});
+		_delayPromises.push(promise);
+		return resolve;
+	};
+	
+	
 	/**
 	 * Trigger updating of the main sync icon, the sync error icon, and
 	 * library-specific sync error icons across all windows