From faa7067c9db8bf34cceaac08d46d42bdda24cd8f Mon Sep 17 00:00:00 2001
From: astroshim <hsshim@nflabs.com>
Date: Thu, 9 Jun 2016 21:03:17 +0900
Subject: [PATCH 1/4] alert message when trying to delete last paragraph.

---
 .../paragraph/paragraph.controller.js         | 29 ++++++++++++-------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js b/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
index c8195658105..e371a21ab8d 100644
--- a/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
+++ b/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
@@ -522,17 +522,26 @@ angular.module('zeppelinWebApp')
   };
 
   $scope.removeParagraph = function() {
-    BootstrapDialog.confirm({
-      closable: true,
-      title: '',
-      message: 'Do you want to delete this paragraph?',
-      callback: function(result) {
-        if (result) {
-          console.log('Remove paragraph');
-          websocketMsgSrv.removeParagraph($scope.paragraph.id);
+    var paragraphs = angular.element('div[id$="_paragraphColumn_main"');
+    if (paragraphs[paragraphs.length-1].id.startsWith($scope.paragraph.id)) {
+      BootstrapDialog.alert({
+        closable: true,
+        message: 'The last paragraph can\'t be deleted.'
+      });
+    }
+    else {
+      BootstrapDialog.confirm({
+        closable: true,
+        title: '',
+        message: 'Do you want to delete this paragraph?',
+        callback: function(result) {
+          if (result) {
+            console.log('Remove paragraph');
+            websocketMsgSrv.removeParagraph($scope.paragraph.id);
+          }
         }
-      }
-    });
+      });
+    }
   };
 
   $scope.clearParagraphOutput = function() {

From 4316d28cb3cd8e7d82fde4a8bc19eabcd4f9322f Mon Sep 17 00:00:00 2001
From: astroshim <hsshim@nflabs.com>
Date: Thu, 9 Jun 2016 22:39:31 +0900
Subject: [PATCH 2/4] fix coding style

---
 .../src/app/notebook/paragraph/paragraph.controller.js         | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js b/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
index e371a21ab8d..22ac8e27bc9 100644
--- a/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
+++ b/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js
@@ -528,8 +528,7 @@ angular.module('zeppelinWebApp')
         closable: true,
         message: 'The last paragraph can\'t be deleted.'
       });
-    }
-    else {
+    } else {
       BootstrapDialog.confirm({
         closable: true,
         title: '',

From 6acdd9d3554eb72af3cd8ca9edc47ed5e18124cf Mon Sep 17 00:00:00 2001
From: astroshim <hsshim@nflabs.com>
Date: Sat, 11 Jun 2016 01:14:59 +0900
Subject: [PATCH 3/4] add ng-hide

---
 zeppelin-web/src/app/notebook/paragraph/paragraph-control.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html b/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
index 7c51f3ad6f3..c36a316dd8e 100644
--- a/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
+++ b/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
@@ -90,7 +90,7 @@
       </li>
       <li>
         <!-- remove paragraph -->
-        <a ng-click="removeParagraph()"><span class="fa fa-times"></span> Remove</a>
+        <a ng-click="removeParagraph()" ng-hide="$last"><span class="fa fa-times"></span> Remove</a>
       </li>
     </ul>
   </span>

From 8c4a29ebc80879740eb3ec312675af1324f8f81a Mon Sep 17 00:00:00 2001
From: astroshim <hsshim@nflabs.com>
Date: Wed, 15 Jun 2016 12:55:21 +0900
Subject: [PATCH 4/4] reset commits

---
 .../src/app/notebook/paragraph/paragraph-control.html         | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html b/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
index c36a316dd8e..4ec515654a0 100644
--- a/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
+++ b/zeppelin-web/src/app/notebook/paragraph/paragraph-control.html
@@ -54,10 +54,10 @@
         </a>
       </li>
       <li>
-        <a ng-click="moveUp()"><span class="icon-arrow-up"></span> Move Up</a>
+        <a ng-click="moveUp()" ng-hide="$first"><span class="icon-arrow-up"></span> Move Up</a>
       </li>
       <li>
-        <a ng-click="moveDown()"><span class="icon-arrow-down"></span> Move Down</a>
+        <a ng-click="moveDown()" ng-hide="$last"><span class="icon-arrow-down"></span> Move Down</a>
       </li>
       <li>
         <a ng-click="insertNew()"><span class="icon-plus"></span> Insert New</a>