ENHANCEMENT: Addition of tag cloud widget complete with tests

.travis.yml

@@ -46,7 +46,7 @@ before_script:
   - phpenv rehash
   - composer self-update || true
   - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
-  - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
+  - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss --require "silverstripe/comments" --require "silverstripe/widgets"
   - cd ~/builds/ss
 
 #Execute tests with or without coverage

code/widgets/BlogTagsCloudWidget.php

@@ -0,0 +1,108 @@
+<?php
+
+if (!class_exists('Widget')) {
+    return;
+}
+
+/**
+ * @method Blog Blog()
+ */
+class BlogTagsCloudWidget extends Widget
+{
+    /**
+     * @var string
+     */
+    private static $title = 'Tags Cloud';
+
+    /**
+     * @var string
+     */
+    private static $cmsTitle = 'Blog Tags Cloud';
+
+    /**
+     * @var string
+     */
+    private static $description = 'Displays a tag cloud for this blog.';
+
+    /**
+     * @var array
+     */
+    private static $db = array();
+
+    /**
+     * @var array
+     */
+    private static $has_one = array(
+        'Blog' => 'Blog',
+    );
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCMSFields()
+    {
+        $this->beforeUpdateCMSFields(function ($fields) {
+            /*
+             * @var FieldList $fields
+             */
+            $fields->push(
+                DropdownField::create('BlogID', _t('BlogTagsCloudWidget.Blog',
+                                        'Blog'), Blog::get()->map())
+            );
+        });
+
+        return parent::getCMSFields();
+    }
+
+    /**
+     * @return array
+     */
+    public function getTags()
+    {
+        if ($blog = $this->Blog()) {
+            $escapedID = Convert::raw2sql($blog->ID);
+            $sql = 'SELECT DISTINCT "BlogTag"."URLSegment","BlogTag"."Title",Count("BlogTagID") AS "TagCount"
+				    from "BlogPost_Tags"
+				    INNER JOIN "BlogPost"
+				    ON "BlogPost"."ID" = "BlogPost_Tags"."BlogPostID"
+				    INNER JOIN "BlogTag"
+				    ON "BlogTag"."ID" = "BlogPost_Tags"."BlogTagID"
+				    WHERE "BlogID" = ' . $escapedID
+                . ' GROUP By  "BlogTag"."URLSegment","BlogTag"."Title"
+				    ORDER BY "Title"';
+
+            $records = DB::query($sql);
+            $bloglink = $blog->Link();
+            $maxTagCount = 0;
+
+            // create DataObjects that can be used to render the tag cloud
+            $tags = new ArrayList();
+            foreach ($records as $record) {
+                $tag = new DataObject();
+                $tag->TagName = $record['Title'];
+                $link = $bloglink.'tag/'.$record['URLSegment'];
+                $tag->Link = $link;
+                if ($record['TagCount'] > $maxTagCount) {
+                    $maxTagCount = $record['TagCount'];
+                }
+                $tag->TagCount = $record['TagCount'];
+                $tags->push($tag);
+            }
+
+            // normalize the tag counts from 1 to 10
+            $tagfactor = 10 / $maxTagCount;
+            foreach ($tags->getIterator() as $tag) {
+                $normalized = round($tagfactor * ($tag->TagCount));
+                $tag->NormalizedTag = $normalized;
+            }
+
+            return $tags;
+        }
+
+        return array();
+    }
+}
+
+class BlogTagsCloudWidget_Controller extends Widget_Controller
+{
+}

css/blog.css

@@ -12,3 +12,47 @@
 .blog-sidebar .WidgetHolder ul li {
   list-style-type: none;
 }
+ul.blogTagCloud {
+  list-style-type: none;
+  clear: both;
+}
+ul.blogTagCloud li {
+  float: left;
+  display: inline;
+  padding-right: 8px;
+}
+ul.blogTagCloud li a span {
+    float: left;
+    line-height: 30px; text-align: center;
+    padding: 0px;
+}
+ul.blogTagCloud .tagCount10 {
+  font-size: 26pt;
+}
+ul.blogTagCloud .tagCount9 {
+  font-size: 24pt;
+}
+ul.blogTagCloud .tagCount8 {
+  font-size: 22pt;
+}
+ul.blogTagCloud .tagCount7 {
+  font-size: 20pt;
+}
+ul.blogTagCloud .tagCount6 {
+  font-size: 18pt;
+}
+ul.blogTagCloud .tagCount5 {
+  font-size: 16pt;
+}
+ul.blogTagCloud .tagCount4 {
+  font-size: 14pt;
+}
+ul.blogTagCloud .tagCount3 {
+  font-size: 12pt;
+}
+ul.blogTagCloud .tagCount2 {
+  font-size: 10pt;
+}
+ul.blogTagCloud .tagCount1 {
+  font-size: 8pt;
+}

scss/blog.scss

@@ -13,3 +13,63 @@
         list-style-type: none;
     }
 }
+
+// tag cloud related
+$baseTagFontSize:4pt;
+
+ul.blogTagCloud {
+	list-style-type: none;
+	clear: both;
+
+	li {
+		float: left;
+		display: inline;
+        padding-right: 8px;
+
+        a span {
+            float: left;
+            line-height: 30px; text-align: center;
+            padding: 0px;
+        }
+	}
+
+	.tagCount10 {
+		font-size: $baseTagFontSize+22pt;
+	}
+
+	.tagCount9 {
+		font-size: $baseTagFontSize+20pt;
+	}
+
+	.tagCount8 {
+		font-size: $baseTagFontSize+18pt;
+	}
+
+	.tagCount7 {
+		font-size: $baseTagFontSize+16pt;
+	}
+
+	.tagCount6 {
+		font-size: $baseTagFontSize+14pt;
+	}
+
+	.tagCount5 {
+		font-size: $baseTagFontSize+12pt;
+	}
+
+	.tagCount4 {
+		font-size: $baseTagFontSize+10pt;
+	}
+
+	.tagCount3 {
+		font-size: $baseTagFontSize+8pt;
+	}
+
+	.tagCount2 {
+		font-size: $baseTagFontSize+6pt;
+	}
+
+	.tagCount1 {
+		font-size: $baseTagFontSize+4pt;
+	}
+}

templates/widgets/BlogTagsCloudWidget.ss

@@ -0,0 +1,12 @@
+<% if $Tags %>
+	<ul class="blogTagCloud">
+		<% loop $Tags %>
+			<li>
+				<a href="$Link" title="$TagName">
+					<span class="text tagCount{$NormalizedTag}">$TagName</span>
+				</a>
+			</li>
+		<% end_loop %>
+	</ul>
+	<div style="clear: both;"></div>
+<% end_if %>

tests/BlogCategoryTest.php

@@ -49,7 +49,7 @@ class BlogCategoryTest extends FunctionalTest
          */
         $category = $this->objFromFixture('BlogCategory', 'FirstCategory');
 
-        $this->assertEquals(1, $category->BlogPosts()->count(), 'Category blog post count');
+        $this->assertEquals(5, $category->BlogPosts()->count(), 'Category blog post count');
     }
 
     public function testCanView()

tests/BlogTagsCloudWidgetTest.php

@@ -0,0 +1,60 @@
+<?php
+
+class BlogTagsCloudWidgetTest extends SapphireTest {
+
+    /**
+     * @var string
+     */
+    public static $fixture_file = 'blog.yml';
+
+    public function testGetCMSFields() {
+        if (!class_exists('Widget')) {
+            $this->markTestSkipped('Widgets module not installed');
+        }
+
+        $widget = new BlogTagsCloudWidget();
+        $fields = $widget->getCMSFields();
+        $names = array();
+        foreach ($fields as $field) {
+            array_push($names, $field->getName());
+        }
+
+        $expected = array('Title', 'Enabled', 'BlogID');
+        $this->assertEquals($expected, $names);
+    }
+
+    public function testGetTags() {
+        if (!class_exists('Widget')) {
+            $this->markTestSkipped('Widgets module not installed');
+        }
+        $widget = new BlogTagsCloudWidget();
+        $blog = $this->objFromFixture('Blog', 'FourthBlog');
+        $widget->BlogID = $blog->ID;
+        $widget->write();
+        $tags = $widget->getTags()->toArray();
+
+        $tag = $tags[0];
+        $this->assertEquals('Cat', $tag->TagName);
+        $this->assertEquals('/fourth-blog/tag/cat', $tag->Link);
+        $this->assertEquals(2, $tag->TagCount);
+        $this->assertEquals(5, $tag->NormalizedTag);
+
+        $tag = $tags[1];
+        $this->assertEquals('Cool', $tag->TagName);
+        $this->assertEquals('/fourth-blog/tag/cool', $tag->Link);
+        $this->assertEquals(3, $tag->TagCount);
+        $this->assertEquals(8, $tag->NormalizedTag);
+
+        $tag = $tags[2];
+        $this->assertEquals('Kiwi', $tag->TagName);
+        $this->assertEquals('/fourth-blog/tag/kiwi', $tag->Link);
+        $this->assertEquals(1, $tag->TagCount);
+        $this->assertEquals(3, $tag->NormalizedTag);
+
+        $tag = $tags[3];
+        $this->assertEquals('Popular', $tag->TagName);
+        $this->assertEquals('/fourth-blog/tag/popular', $tag->Link);
+        $this->assertEquals(4, $tag->TagCount);
+        $this->assertEquals(10, $tag->NormalizedTag);
+    }
+}

tests/blog.yml

@@ -85,6 +85,24 @@ BlogTag:
     URLSegment: 'third-tag'
     Blog: =>Blog.ThirdBlog
 
+  #Tags for Tag Cloud widget
+  PopularTag:
+    Title: 'Popular'
+    URLSegment: 'popular-tag'
+    Blog: =>Blog.FourthBlog
+  CoolTag:
+    Title: 'Cool'
+    URLSegment: 'cool-tag'
+    Blog: =>Blog.FourthBlog
+  CatTag:
+    Title: 'Cat'
+    URLSegment: 'cat-tag'
+    Blog: =>Blog.FourthBlog
+  KiwiTag:
+    Title: 'Kiwi'
+    URLSegment: 'kiwi-tag'
+    Blog: =>Blog.FourthBlog
+
 BlogCategory:
   FirstCategory:
     Title: 'First Category'
@@ -146,3 +164,33 @@ BlogPost:
     PublishDate: '2012-01-09 15:00:00'
     Parent: =>Blog.FourthBlog
     Authors: =>Member.BlogEditor,=>Member.Writer,=>Member.Contributor
+
+  #Posts for the tag cloud widget test
+  TaggedPost1:
+    Title: 'Tagged Post 1'
+    URLSegment: tagged-post-1
+    PublishDate: '2012-01-09 15:00:00'
+    Tags: =>BlogTag.PopularTag,=>BlogTag.CoolTag
+    Categories: =>BlogCategory.FirstCategory
+    Parent: =>Blog.FourthBlog
+  TaggedPost2:
+    Title: 'Tagged Post 2'
+    URLSegment: tagged-post-2
+    PublishDate: '2012-01-09 15:00:00'
+    Tags: =>BlogTag.PopularTag,=>BlogTag.CoolTag,=>BlogTag.CatTag
+    Categories: =>BlogCategory.FirstCategory
+    Parent: =>Blog.FourthBlog
+  TaggedPost3:
+    Title: 'Tagged Post 3'
+    URLSegment: tagged-post-3
+    PublishDate: '2012-01-09 17:20:00'
+    Tags: =>BlogTag.PopularTag,=>BlogTag.CoolTag,=>BlogTag.CatTag,=>BlogTag.KiwiTag
+    Categories: =>BlogCategory.FirstCategory
+    Parent: =>Blog.FourthBlog
+  TaggedPost4:
+    Title: 'Tagged Post 4'
+    URLSegment: tagged-post-4
+    PublishDate: '2012-04-09 15:00:00'
+    Tags: =>BlogTag.PopularTag
+    Categories: =>BlogCategory.FirstCategory
+    Parent: =>Blog.FourthBlog