From 8159c4a8655c4c565baf6078074d1a791b5b81e5 Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@jermolene.com>
Date: Sun, 4 Aug 2019 11:34:45 +0100
Subject: [PATCH] Fix navigator widget when story and/or history attributes are
 missing

To fix the crash described here: https://groups.google.com/d/msgid/tiddlywiki/c5461591-bf27-4c85-9f27-9eef14c38816%40googlegroups.com?utm_medium=email&utm_source=footer
---
 core/modules/widgets/navigator.js | 61 ++++++++++++++++++-------------
 core/modules/wiki.js              | 12 ++++--
 2 files changed, 44 insertions(+), 29 deletions(-)

diff --git a/core/modules/widgets/navigator.js b/core/modules/widgets/navigator.js
index 9494346fb..4825e7a02 100755
--- a/core/modules/widgets/navigator.js
+++ b/core/modules/widgets/navigator.js
@@ -84,39 +84,50 @@ NavigatorWidget.prototype.getStoryList = function() {
 };
 
 NavigatorWidget.prototype.saveStoryList = function(storyList) {
-	var storyTiddler = this.wiki.getTiddler(this.storyTitle);
-	this.wiki.addTiddler(new $tw.Tiddler(
-		{title: this.storyTitle},
-		storyTiddler,
-		{list: storyList}
-	));
+	if(this.storyTitle) {
+		var storyTiddler = this.wiki.getTiddler(this.storyTitle);
+		this.wiki.addTiddler(new $tw.Tiddler(
+			{title: this.storyTitle},
+			storyTiddler,
+			{list: storyList}
+		));		
+	}
 };
 
 NavigatorWidget.prototype.removeTitleFromStory = function(storyList,title) {
-	var p = storyList.indexOf(title);
-	while(p !== -1) {
-		storyList.splice(p,1);
-		p = storyList.indexOf(title);
+	if(storyList) {
+		var p = storyList.indexOf(title);
+		while(p !== -1) {
+			storyList.splice(p,1);
+			p = storyList.indexOf(title);
+		}		
 	}
 };
 
 NavigatorWidget.prototype.replaceFirstTitleInStory = function(storyList,oldTitle,newTitle) {
-	var pos = storyList.indexOf(oldTitle);
-	if(pos !== -1) {
-		storyList[pos] = newTitle;
-		do {
-			pos = storyList.indexOf(oldTitle,pos + 1);
-			if(pos !== -1) {
-				storyList.splice(pos,1);
-			}
-		} while(pos !== -1);
-	} else {
-		storyList.splice(0,0,newTitle);
+	if(storyList) {
+		var pos = storyList.indexOf(oldTitle);
+		if(pos !== -1) {
+			storyList[pos] = newTitle;
+			do {
+				pos = storyList.indexOf(oldTitle,pos + 1);
+				if(pos !== -1) {
+					storyList.splice(pos,1);
+				}
+			} while(pos !== -1);
+		} else {
+			storyList.splice(0,0,newTitle);
+		}		
 	}
 };
 
 NavigatorWidget.prototype.addToStory = function(title,fromTitle) {
-	this.wiki.addToStory(title,fromTitle,this.storyTitle,{openLinkFromInsideRiver: this.getAttribute("openLinkFromInsideRiver","top"),openLinkFromOutsideRiver: this.getAttribute("openLinkFromOutsideRiver","top")});
+	if(this.storyTitle) {
+		this.wiki.addToStory(title,fromTitle,this.storyTitle,{
+			openLinkFromInsideRiver: this.getAttribute("openLinkFromInsideRiver","top"),
+			openLinkFromOutsideRiver: this.getAttribute("openLinkFromOutsideRiver","top")
+		});
+	}
 };
 
 /*
@@ -458,14 +469,14 @@ NavigatorWidget.prototype.handleNewTiddlerEvent = function(event) {
 		},this.wiki.getModificationFields());
 	this.wiki.addTiddler(draftTiddler);
 	// Update the story to insert the new draft at the top and remove any existing tiddler
-	if(storyList.indexOf(draftTitle) === -1) {
+	if(storyList && storyList.indexOf(draftTitle) === -1) {
 		var slot = storyList.indexOf(event.navigateFromTitle);
 		if(slot === -1) {
 			slot = this.getAttribute("openLinkFromOutsideRiver","top") === "bottom" ? storyList.length - 1 : slot;
 		}
 		storyList.splice(slot + 1,0,draftTitle);
 	}
-	if(storyList.indexOf(title) !== -1) {
+	if(storyList && storyList.indexOf(title) !== -1) {
 		storyList.splice(storyList.indexOf(title),1);
 	}
 	this.saveStoryList(storyList);
@@ -521,7 +532,7 @@ NavigatorWidget.prototype.handleImportTiddlersEvent = function(event) {
 		var storyList = this.getStoryList(),
 			history = [];
 		// Add it to the story
-		if(storyList.indexOf(IMPORT_TITLE) === -1) {
+		if(storyList && storyList.indexOf(IMPORT_TITLE) === -1) {
 			storyList.unshift(IMPORT_TITLE);
 		}
 		// And to history
diff --git a/core/modules/wiki.js b/core/modules/wiki.js
index 3e5687638..a4bc7b650 100755
--- a/core/modules/wiki.js
+++ b/core/modules/wiki.js
@@ -1388,8 +1388,10 @@ fromPageRect: page coordinates of the origin of the navigation
 historyTitle: title of history tiddler (defaults to $:/HistoryList)
 */
 exports.addToHistory = function(title,fromPageRect,historyTitle) {
-	var story = new $tw.Story({wiki: this, historyTitle: historyTitle});
-	story.addToHistory(title,fromPageRect);
+	if(historyTitle) {
+		var story = new $tw.Story({wiki: this, historyTitle: historyTitle});
+		story.addToHistory(title,fromPageRect);		
+	}
 };
 
 /*
@@ -1400,8 +1402,10 @@ storyTitle: title of story tiddler (defaults to $:/StoryList)
 options: see story.js
 */
 exports.addToStory = function(title,fromTitle,storyTitle,options) {
-	var story = new $tw.Story({wiki: this, storyTitle: storyTitle});
-	story.addToStory(title,fromTitle,options);
+	if(storyTitle) {
+		var story = new $tw.Story({wiki: this, storyTitle: storyTitle});
+		story.addToStory(title,fromTitle,options);		
+	}
 };
 
 /*