From 03f425b63d1ba8c2ef8dc77ccebc6e2a0c254b6f Mon Sep 17 00:00:00 2001
From: Zachary Vance <vanceza@gmail.com>
Date: Wed, 3 Jun 2015 16:34:24 -0700
Subject: [PATCH] getSiblingOffset from vimflowy

---
 dist/flowy.js           | 19 ++++++++++---------
 dist/flowy.unwrapped.js | 19 ++++++++++---------
 src/models/todo.js      | 19 ++++++++++---------
 3 files changed, 30 insertions(+), 27 deletions(-)

diff --git a/dist/flowy.js b/dist/flowy.js
index 52463c0..32af476 100644
--- a/dist/flowy.js
+++ b/dist/flowy.js
@@ -744,20 +744,21 @@ var TodoModel = Backbone.Model.extend({
         if (parent && parent.isRoot() && !options.rootAllowed) return undefined;
         return parent;
     },
-    getPreviousSibling: function() {
+    getSiblingOffset: function(offset) {
         var parent = this.getParent();
         if (!parent) return undefined;
         var index = parent.findChild(this.id);
-        if (index < 0 || index === 0) return undefined;
-        return parent.getChild(index - 1);
+        if (index < 0) return undefined;
+        var numChildren = parent.getChildrenCount();
+        var siblingIndex = index + offset;
+        if (siblingIndex < 0 || siblingIndex >= numChildren) return undefined;
+        return parent.getChild(siblingIndex);
+    },
+    getPreviousSibling: function() {
+        return this.getSiblingOffset(-1);
     },
     getNextSibling: function() {
-        var parent = this.getParent();
-        if (!parent) return undefined;
-        var index = parent.findChild(this.id);
-        var numChildren = parent.getChildrenCount();
-        if (index < 0 || index === numChildren - 1) return undefined;
-        return parent.getChild(index + 1);
+        return this.getSiblingOffset(1);
     },
     nextNode: function(options) {
         options = _.defaults({}, options, {childrenAllowed: true});
diff --git a/dist/flowy.unwrapped.js b/dist/flowy.unwrapped.js
index e6babb8..7e9d913 100644
--- a/dist/flowy.unwrapped.js
+++ b/dist/flowy.unwrapped.js
@@ -743,20 +743,21 @@ var TodoModel = Backbone.Model.extend({
         if (parent && parent.isRoot() && !options.rootAllowed) return undefined;
         return parent;
     },
-    getPreviousSibling: function() {
+    getSiblingOffset: function(offset) {
         var parent = this.getParent();
         if (!parent) return undefined;
         var index = parent.findChild(this.id);
-        if (index < 0 || index === 0) return undefined;
-        return parent.getChild(index - 1);
+        if (index < 0) return undefined;
+        var numChildren = parent.getChildrenCount();
+        var siblingIndex = index + offset;
+        if (siblingIndex < 0 || siblingIndex >= numChildren) return undefined;
+        return parent.getChild(siblingIndex);
+    },
+    getPreviousSibling: function() {
+        return this.getSiblingOffset(-1);
     },
     getNextSibling: function() {
-        var parent = this.getParent();
-        if (!parent) return undefined;
-        var index = parent.findChild(this.id);
-        var numChildren = parent.getChildrenCount();
-        if (index < 0 || index === numChildren - 1) return undefined;
-        return parent.getChild(index + 1);
+        return this.getSiblingOffset(1);
     },
     nextNode: function(options) {
         options = _.defaults({}, options, {childrenAllowed: true});
diff --git a/src/models/todo.js b/src/models/todo.js
index ab6a810..11f9206 100644
--- a/src/models/todo.js
+++ b/src/models/todo.js
@@ -40,20 +40,21 @@ var TodoModel = Backbone.Model.extend({
         if (parent && parent.isRoot() && !options.rootAllowed) return undefined;
         return parent;
     },
-    getPreviousSibling: function() {
+    getSiblingOffset: function(offset) {
         var parent = this.getParent();
         if (!parent) return undefined;
         var index = parent.findChild(this.id);
-        if (index < 0 || index === 0) return undefined;
-        return parent.getChild(index - 1);
+        if (index < 0) return undefined;
+        var numChildren = parent.getChildrenCount();
+        var siblingIndex = index + offset;
+        if (siblingIndex < 0 || siblingIndex >= numChildren) return undefined;
+        return parent.getChild(siblingIndex);
+    },
+    getPreviousSibling: function() {
+        return this.getSiblingOffset(-1);
     },
     getNextSibling: function() {
-        var parent = this.getParent();
-        if (!parent) return undefined;
-        var index = parent.findChild(this.id);
-        var numChildren = parent.getChildrenCount();
-        if (index < 0 || index === numChildren - 1) return undefined;
-        return parent.getChild(index + 1);
+        return this.getSiblingOffset(1);
     },
     nextNode: function(options) {
         options = _.defaults({}, options, {childrenAllowed: true});
-- 
2.47.3