diff --git a/src/main/scala/gitbucket/core/controller/AccountController.scala b/src/main/scala/gitbucket/core/controller/AccountController.scala
index 0c72af7..19c553a 100644
--- a/src/main/scala/gitbucket/core/controller/AccountController.scala
+++ b/src/main/scala/gitbucket/core/controller/AccountController.scala
@@ -6,7 +6,7 @@
 import gitbucket.core.plugin.PluginRegistry
 import gitbucket.core.service._
 import gitbucket.core.ssh.SshUtil
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.StringUtil._
diff --git a/src/main/scala/gitbucket/core/controller/ApiController.scala b/src/main/scala/gitbucket/core/controller/ApiController.scala
index 872886e..ab2a0f1 100644
--- a/src/main/scala/gitbucket/core/controller/ApiController.scala
+++ b/src/main/scala/gitbucket/core/controller/ApiController.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.service.IssuesService.IssueSearchCondition
 import gitbucket.core.service.PullRequestService._
 import gitbucket.core.service._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.JGitUtil._
 import gitbucket.core.util._
diff --git a/src/main/scala/gitbucket/core/controller/ControllerBase.scala b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
index 21784c3..ceff777 100644
--- a/src/main/scala/gitbucket/core/controller/ControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.api.ApiError
 import gitbucket.core.model.Account
 import gitbucket.core.service.{AccountService, SystemSettingsService,RepositoryService}
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util._
diff --git a/src/main/scala/gitbucket/core/controller/FileUploadController.scala b/src/main/scala/gitbucket/core/controller/FileUploadController.scala
index 9ca7e6b..cff4ceb 100644
--- a/src/main/scala/gitbucket/core/controller/FileUploadController.scala
+++ b/src/main/scala/gitbucket/core/controller/FileUploadController.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.service.{AccountService, RepositoryService}
 import gitbucket.core.servlet.Database
 import gitbucket.core.util._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.Implicits._
 import org.eclipse.jgit.api.Git
diff --git a/src/main/scala/gitbucket/core/controller/IndexController.scala b/src/main/scala/gitbucket/core/controller/IndexController.scala
index 1cd4282..9d0316f 100644
--- a/src/main/scala/gitbucket/core/controller/IndexController.scala
+++ b/src/main/scala/gitbucket/core/controller/IndexController.scala
@@ -4,13 +4,13 @@
 import gitbucket.core.model.Account
 import gitbucket.core.service._
 import gitbucket.core.util.Implicits._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.{Keys, LDAPUtil, ReferrerAuthenticator, UsersAuthenticator}
 import io.github.gitbucket.scalatra.forms._
 import org.scalatra.Ok
 
 
-class IndexController extends IndexControllerBase 
+class IndexController extends IndexControllerBase
   with RepositoryService with ActivityService with AccountService with RepositorySearchService with IssuesService
   with UsersAuthenticator with ReferrerAuthenticator
 
diff --git a/src/main/scala/gitbucket/core/controller/IssuesController.scala b/src/main/scala/gitbucket/core/controller/IssuesController.scala
index f55db68..eeb19ac 100644
--- a/src/main/scala/gitbucket/core/controller/IssuesController.scala
+++ b/src/main/scala/gitbucket/core/controller/IssuesController.scala
@@ -3,7 +3,7 @@
 import gitbucket.core.issues.html
 import gitbucket.core.service.IssuesService._
 import gitbucket.core.service._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util._
 import gitbucket.core.view
diff --git a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
index dd0c0f7..cf8c49b 100644
--- a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
+++ b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
@@ -8,7 +8,7 @@
 import gitbucket.core.service.PullRequestService._
 import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.service._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util._
diff --git a/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala b/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
index 8a14ab0..0ca0305 100644
--- a/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositorySettingsController.scala
@@ -6,7 +6,7 @@
 import gitbucket.core.service.WebHookService._
 import gitbucket.core.util._
 import gitbucket.core.util.JGitUtil._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.Directory._
 import io.github.gitbucket.scalatra.forms._
@@ -92,14 +92,14 @@
   get("/:owner/:repository/settings")(ownerOnly { repository =>
     redirect(s"/${repository.owner}/${repository.name}/settings/options")
   })
-  
+
   /**
    * Display the Options page.
    */
   get("/:owner/:repository/settings/options")(ownerOnly {
     html.options(_, flash.get("info"))
   })
-  
+
   /**
    * Save the repository options.
    */
diff --git a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
index 71f4cf2..1b4ecc9 100644
--- a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
@@ -10,7 +10,7 @@
 import gitbucket.core.util._
 import gitbucket.core.util.JGitUtil._
 import gitbucket.core.util.StringUtil._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.Directory._
 import gitbucket.core.model.{Account, WebHook}
diff --git a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
index 801b873..ac2fbff 100644
--- a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
@@ -9,7 +9,7 @@
 import gitbucket.core.plugin.PluginRegistry
 import SystemSettingsService._
 import gitbucket.core.util.Implicits._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.StringUtil._
 import io.github.gitbucket.scalatra.forms._
diff --git a/src/main/scala/gitbucket/core/controller/WikiController.scala b/src/main/scala/gitbucket/core/controller/WikiController.scala
index f46b4be..49cc97d 100644
--- a/src/main/scala/gitbucket/core/controller/WikiController.scala
+++ b/src/main/scala/gitbucket/core/controller/WikiController.scala
@@ -5,14 +5,14 @@
 import gitbucket.core.service.{AccountService, ActivityService, RepositoryService, WikiService}
 import gitbucket.core.util._
 import gitbucket.core.util.StringUtil._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.Directory._
 import io.github.gitbucket.scalatra.forms._
 import org.eclipse.jgit.api.Git
 import org.scalatra.i18n.Messages
 
-class WikiController extends WikiControllerBase 
+class WikiController extends WikiControllerBase
   with WikiService with RepositoryService with AccountService with ActivityService
   with ReadableUsersAuthenticator with ReferrerAuthenticator
 
@@ -20,7 +20,7 @@
   self: WikiService with RepositoryService with ActivityService with ReadableUsersAuthenticator with ReferrerAuthenticator =>
 
   case class WikiPageEditForm(pageName: String, content: String, message: Option[String], currentPageName: String, id: String)
-  
+
   val newForm = mapping(
     "pageName"        -> trim(label("Page name"         , text(required, maxlength(40), pagename, unique))),
     "content"         -> trim(label("Content"           , text(required, conflictForNew))),
@@ -28,7 +28,7 @@
     "currentPageName" -> trim(label("Current page name" , text())),
     "id"              -> trim(label("Latest commit id"  , text()))
   )(WikiPageEditForm.apply)
-  
+
   val editForm = mapping(
     "pageName"        -> trim(label("Page name"         , text(required, maxlength(40), pagename))),
     "content"         -> trim(label("Content"           , text(required, conflictForEdit))),
@@ -36,7 +36,7 @@
     "currentPageName" -> trim(label("Current page name" , text(required))),
     "id"              -> trim(label("Latest commit id"  , text(required)))
   )(WikiPageEditForm.apply)
-  
+
   get("/:owner/:repository/wiki")(referrersOnly { repository =>
     getWikiPage(repository.owner, repository.name, "Home").map { page =>
       html.page("Home", page, getWikiPageList(repository.owner, repository.name),
@@ -45,7 +45,7 @@
         getWikiPage(repository.owner, repository.name, "_Footer"))
     } getOrElse redirect(s"/${repository.owner}/${repository.name}/wiki/Home/_edit")
   })
-  
+
   get("/:owner/:repository/wiki/:page")(referrersOnly { repository =>
     val pageName = StringUtil.urlDecode(params("page"))
 
@@ -56,7 +56,7 @@
         getWikiPage(repository.owner, repository.name, "_Footer"))
     } getOrElse redirect(s"/${repository.owner}/${repository.name}/wiki/${StringUtil.urlEncode(pageName)}/_edit")
   })
-  
+
   get("/:owner/:repository/wiki/:page/_history")(referrersOnly { repository =>
     val pageName = StringUtil.urlDecode(params("page"))
 
@@ -67,7 +67,7 @@
       }
     }
   })
-  
+
   get("/:owner/:repository/wiki/:page/_compare/:commitId")(referrersOnly { repository =>
     val pageName = StringUtil.urlDecode(params("page"))
     val Array(from, to) = params("commitId").split("\\.\\.\\.")
@@ -77,7 +77,7 @@
         isEditable(repository), flash.get("info"))
     }
   })
-  
+
   get("/:owner/:repository/wiki/_compare/:commitId")(referrersOnly { repository =>
     val Array(from, to) = params("commitId").split("\\.\\.\\.")
 
@@ -120,7 +120,7 @@
       html.edit(pageName, getWikiPage(repository.owner, repository.name, pageName), repository)
     } else Unauthorized()
   })
-  
+
   post("/:owner/:repository/wiki/_edit", editForm)(readableUsersOnly { (form, repository) =>
     if(isEditable(repository)){
       defining(context.loginAccount.get){ loginAccount =>
@@ -145,13 +145,13 @@
       }
     } else Unauthorized()
   })
-  
+
   get("/:owner/:repository/wiki/_new")(readableUsersOnly { repository =>
     if(isEditable(repository)){
       html.edit("", None, repository)
     } else Unauthorized()
   })
-  
+
   post("/:owner/:repository/wiki/_new", newForm)(readableUsersOnly { (form, repository) =>
     if(isEditable(repository)){
       defining(context.loginAccount.get){ loginAccount =>
@@ -169,7 +169,7 @@
       }
     } else Unauthorized()
   })
-  
+
   get("/:owner/:repository/wiki/:page/_delete")(readableUsersOnly { repository =>
     if(isEditable(repository)){
       val pageName = StringUtil.urlDecode(params("page"))
@@ -186,7 +186,7 @@
   get("/:owner/:repository/wiki/_pages")(referrersOnly { repository =>
     html.pages(getWikiPageList(repository.owner, repository.name), repository, isEditable(repository))
   })
-  
+
   get("/:owner/:repository/wiki/_history")(referrersOnly { repository =>
     using(Git.open(getWikiRepositoryDir(repository.owner, repository.name))){ git =>
       JGitUtil.getCommitLog(git, "master") match {
diff --git a/src/main/scala/gitbucket/core/plugin/Plugin.scala b/src/main/scala/gitbucket/core/plugin/Plugin.scala
index 5303469..4367c68 100644
--- a/src/main/scala/gitbucket/core/plugin/Plugin.scala
+++ b/src/main/scala/gitbucket/core/plugin/Plugin.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.model.Account
 import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.service.SystemSettingsService.SystemSettings
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import io.github.gitbucket.solidbase.model.Version
 
 /**
diff --git a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
index e3c0c3b..7ba1026 100644
--- a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
+++ b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
@@ -9,7 +9,7 @@
 import gitbucket.core.service.ProtectedBranchService.ProtectedBranchReceiveHook
 import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.service.SystemSettingsService.SystemSettings
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.DatabaseConfig
 import gitbucket.core.util.Directory._
 import io.github.gitbucket.solidbase.Solidbase
diff --git a/src/main/scala/gitbucket/core/service/AccessTokenService.scala b/src/main/scala/gitbucket/core/service/AccessTokenService.scala
index d9a9411..2e25cc0 100644
--- a/src/main/scala/gitbucket/core/service/AccessTokenService.scala
+++ b/src/main/scala/gitbucket/core/service/AccessTokenService.scala
@@ -42,7 +42,7 @@
     Accounts
       .join(AccessTokens)
       .filter { case (ac, t) => (ac.userName === t.userName) && (t.tokenHash === tokenToHash(token).bind) && (ac.removed === false.bind) }
-      .map { case (ac, t) => ac }
+      .map    { case (ac, t) => ac }
       .firstOption
 
   def getAccessTokens(userName: String)(implicit s: Session): List[AccessToken] =
diff --git a/src/main/scala/gitbucket/core/service/HandleCommentService.scala b/src/main/scala/gitbucket/core/service/HandleCommentService.scala
index fe94605..aaa4cf7 100644
--- a/src/main/scala/gitbucket/core/service/HandleCommentService.scala
+++ b/src/main/scala/gitbucket/core/service/HandleCommentService.scala
@@ -4,7 +4,7 @@
 import gitbucket.core.model.Issue
 import gitbucket.core.model.Profile._
 import gitbucket.core.model.Profile.profile.blockingApi._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.Notifier
 
diff --git a/src/main/scala/gitbucket/core/service/IssuesService.scala b/src/main/scala/gitbucket/core/service/IssuesService.scala
index d9c5898..c6c4085 100644
--- a/src/main/scala/gitbucket/core/service/IssuesService.scala
+++ b/src/main/scala/gitbucket/core/service/IssuesService.scala
@@ -3,14 +3,13 @@
 import gitbucket.core.util.JGitUtil.CommitInfo
 import gitbucket.core.util.StringUtil._
 import gitbucket.core.util.Implicits._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.model.{Issue, PullRequest, IssueComment, IssueLabel, Label, Account, Repository, CommitState, Role}
 import gitbucket.core.model.Profile._
 import gitbucket.core.model.Profile.profile._
 import gitbucket.core.model.Profile.profile.blockingApi._
 import gitbucket.core.model.Profile.dateColumnType
 
-
-
 trait IssuesService {
   self: AccountService with RepositoryService =>
   import IssuesService._
@@ -27,33 +26,37 @@
   def getCommentsForApi(owner: String, repository: String, issueId: Int)(implicit s: Session): List[(IssueComment, Account, Issue)] =
     IssueComments.filter(_.byIssue(owner, repository, issueId))
     .filter(_.action inSetBind Set("comment" , "close_comment", "reopen_comment"))
-    .join(Accounts).on( (t1, t2) => t1.commentedUserName === t2.userName )
-    .join(Issues).on{ case ((t1, t2), t3) => t3.byIssue(t1.userName, t1.repositoryName, t1.issueId) }
-    .map{ case ((t1, t2), t3) => (t1, t2, t3) }
+    .join(Accounts).on { case  t1 ~ t2 => t1.commentedUserName === t2.userName }
+    .join(Issues).on { case t1 ~ t2 ~ t3 => t3.byIssue(t1.userName, t1.repositoryName, t1.issueId) }
+    .map { case t1 ~ t2 ~ t3 => (t1, t2, t3) }
     .list
 
   def getMergedComment(owner: String, repository: String, issueId: Int)(implicit s: Session): Option[(IssueComment, Account)] = {
-    getCommentsForApi(owner, repository, issueId).collectFirst { case (comment, account, _) if comment.action == "merged" => (comment, account) }
+    getCommentsForApi(owner, repository, issueId)
+      .collectFirst { case (comment, account, _) if comment.action == "merged" => (comment, account) }
   }
 
-  def getComment(owner: String, repository: String, commentId: String)(implicit s: Session) =
+  def getComment(owner: String, repository: String, commentId: String)(implicit s: Session): Option[IssueComment] = {
     if (commentId forall (_.isDigit))
       IssueComments filter { t =>
         t.byPrimaryKey(commentId.toInt) && t.byRepository(owner, repository)
       } firstOption
     else None
+  }
 
-  def getIssueLabels(owner: String, repository: String, issueId: Int)(implicit s: Session) =
+  def getIssueLabels(owner: String, repository: String, issueId: Int)(implicit s: Session): List[Label] = {
     IssueLabels
-      .join(Labels).on { (t1, t2) =>
+      .join(Labels).on { case t1 ~ t2 =>
         t1.byLabel(t2.userName, t2.repositoryName, t2.labelId)
       }
-      .filter ( _._1.byIssue(owner, repository, issueId) )
-      .map    ( _._2 )
+      .filter { case t1 ~ t2 => t1.byIssue(owner, repository, issueId) }
+      .map { case t1 ~ t2 => t2 }
       .list
+  }
 
-  def getIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session) =
+  def getIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session): Option[IssueLabel] = {
     IssueLabels filter (_.byPrimaryKey(owner, repository, issueId, labelId)) firstOption
+  }
 
   /**
    * Returns the count of the search result against  issues.
@@ -63,9 +66,9 @@
    * @param repos Tuple of the repository owner and the repository name
    * @return the count of the search result
    */
-  def countIssue(condition: IssueSearchCondition, onlyPullRequest: Boolean,
-                 repos: (String, String)*)(implicit s: Session): Int =
+  def countIssue(condition: IssueSearchCondition, onlyPullRequest: Boolean, repos: (String, String)*)(implicit s: Session): Int = {
     Query(searchIssueQuery(repos, condition, onlyPullRequest).length).first
+  }
 
   /**
    * Returns the Map which contains issue count for each labels.
@@ -79,16 +82,16 @@
                               filterUser: Map[String, String])(implicit s: Session): Map[String, Int] = {
 
     searchIssueQuery(Seq(owner -> repository), condition.copy(labels = Set.empty), false)
-      .join(IssueLabels).on { (t1, t2) =>
+      .join(IssueLabels).on { case t1 ~ t2 =>
         t1.byIssue(t2.userName, t2.repositoryName, t2.issueId)
       }
-      .join(Labels).on { case ((t1, t2), t3) =>
+      .join(Labels).on { case t1 ~ t2 ~ t3 =>
         t2.byLabel(t3.userName, t3.repositoryName, t3.labelId)
       }
-      .groupBy { case ((t1, t2), t3) =>
+      .groupBy { case t1 ~ t2 ~ t3 =>
         t3.labelName
       }
-      .map { case (labelName, t) =>
+      .map { case labelName ~ t =>
         labelName -> t.length
       }
       .list.toMap
@@ -96,8 +99,12 @@
 
   def getCommitStatues(userName: String, repositoryName: String, issueId: Int)(implicit s: Session): Option[CommitStatusInfo] = {
     val status = PullRequests
-      .filter { pr => (pr.userName === userName.bind) && (pr.repositoryName === repositoryName.bind) && (pr.issueId === issueId.bind) }
-      .join(CommitStatuses).on((pr, cs) => pr.userName === cs.userName && pr.repositoryName === cs.repositoryName && pr.commitIdTo === cs.commitId)
+      .filter { pr =>
+        pr.userName === userName.bind && pr.repositoryName === repositoryName.bind && pr.issueId === issueId.bind
+      }
+      .join(CommitStatuses).on { case pr ~ cs =>
+         pr.userName === cs.userName && pr.repositoryName === cs.repositoryName && pr.commitIdTo === cs.commitId
+      }
       .list
 
     if(status.nonEmpty){
@@ -129,11 +136,11 @@
                  (implicit s: Session): List[IssueInfo] = {
     // get issues and comment count and labels
     val result = searchIssueQueryBase(condition, pullRequest, offset, limit, repos)
-        .joinLeft (IssueLabels) .on { case (((t1, t2), i), t3) => t1.byIssue(t3.userName, t3.repositoryName, t3.issueId) }
-        .joinLeft (Labels)      .on { case ((((t1, t2), i), t3), t4) => t3.map(_.byLabel(t4.userName, t4.repositoryName, t4.labelId)) }
-        .joinLeft (Milestones)  .on { case (((((t1, t2), i), t3), t4), t5) => t1.byMilestone(t5.userName, t5.repositoryName, t5.milestoneId) }
-        .sortBy { case (((((t1, t2), i), t3), t4), t5) => i asc }
-        .map { case (((((t1, t2), i), t3), t4), t5) =>
+        .joinLeft (IssueLabels) .on { case t1 ~ t2 ~ i ~ t3           => t1.byIssue(t3.userName, t3.repositoryName, t3.issueId) }
+        .joinLeft (Labels)      .on { case t1 ~ t2 ~ i ~ t3 ~ t4      => t3.map(_.byLabel(t4.userName, t4.repositoryName, t4.labelId)) }
+        .joinLeft (Milestones)  .on { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 => t1.byMilestone(t5.userName, t5.repositoryName, t5.milestoneId) }
+        .sortBy { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 => i asc }
+        .map { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 =>
           (t1, t2.commentCount, t4.map(_.labelId), t4.map(_.labelName), t4.map(_.color), t5.map(_.title))
         }
         .list
@@ -156,9 +163,9 @@
                             (implicit s: Session): List[(Issue, Account)] = {
     // get issues and comment count and labels
     searchIssueQueryBase(condition, false, offset, limit, repos)
-      .join(Accounts).on { case (((t1, t2), i), t3) => t3.userName === t1.openedUserName }
-      .sortBy { case (((t1, t2), i), t3) => i asc }
-      .map { case (((t1, t2), i), t3) => (t1, t3) }
+      .join(Accounts).on { case t1 ~ t2 ~ i ~ t3 => t3.userName === t1.openedUserName }
+      .sortBy { case t1 ~ t2 ~ i ~ t3 => i asc }
+      .map    { case t1 ~ t2 ~ i ~ t3 => (t1, t3) }
       .list
   }
 
@@ -169,12 +176,12 @@
                             (implicit s: Session): List[(Issue, Account, Int, PullRequest, Repository, Account)] = {
     // get issues and comment count and labels
     searchIssueQueryBase(condition, true, offset, limit, repos)
-      .join(PullRequests).on { case (((t1, t2), i), t3) => t3.byPrimaryKey(t1.userName, t1.repositoryName, t1.issueId) }
-      .join(Repositories).on { case ((((t1, t2), i), t3), t4) => t4.byRepository(t1.userName, t1.repositoryName) }
-      .join(Accounts).on { case (((((t1, t2), i), t3), t4), t5) => t5.userName === t1.openedUserName }
-      .join(Accounts).on { case ((((((t1, t2), i), t3), t4), t5), t6) => t6.userName === t4.userName }
-      .sortBy { case ((((((t1, t2), i), t3), t4), t5), t6) => i asc }
-      .map { case ((((((t1, t2), i), t3), t4), t5), t6) => (t1, t5, t2.commentCount, t3, t4, t6) }
+      .join(PullRequests).on { case t1 ~ t2 ~ i ~ t3                => t3.byPrimaryKey(t1.userName, t1.repositoryName, t1.issueId) }
+      .join(Repositories).on { case t1 ~ t2 ~ i ~ t3 ~ t4           => t4.byRepository(t1.userName, t1.repositoryName) }
+      .join(Accounts    ).on { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5      => t5.userName === t1.openedUserName }
+      .join(Accounts    ).on { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 ~ t6 => t6.userName === t4.userName }
+      .sortBy { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 ~ t6 => i asc }
+      .map    { case t1 ~ t2 ~ i ~ t3 ~ t4 ~ t5 ~ t6 => (t1, t5, t2.commentCount, t3, t4, t6) }
       .list
   }
 
@@ -247,36 +254,39 @@
 
   def insertIssue(owner: String, repository: String, loginUser: String, title: String, content: Option[String],
                   assignedUserName: Option[String], milestoneId: Option[Int],
-                  isPullRequest: Boolean = false)(implicit s: Session) =
+                  isPullRequest: Boolean = false)(implicit s: Session): Int = {
     // next id number
     sql"SELECT ISSUE_ID + 1 FROM ISSUE_ID WHERE USER_NAME = $owner AND REPOSITORY_NAME = $repository FOR UPDATE".as[Int]
-        .firstOption.filter { id =>
+      .firstOption.filter { id =>
       Issues insert Issue(
-          owner,
-          repository,
-          id,
-          loginUser,
-          milestoneId,
-          assignedUserName,
-          title,
-          content,
-          false,
-          currentDate,
-          currentDate,
-          isPullRequest)
+        owner,
+        repository,
+        id,
+        loginUser,
+        milestoneId,
+        assignedUserName,
+        title,
+        content,
+        false,
+        currentDate,
+        currentDate,
+        isPullRequest)
 
       // increment issue id
       IssueId
-        .filter (_.byPrimaryKey(owner, repository))
-        .map (_.issueId)
-        .update (id) > 0
+        .filter(_.byPrimaryKey(owner, repository))
+        .map(_.issueId)
+        .update(id) > 0
     } get
+  }
 
-  def registerIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session) =
+  def registerIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session): Int = {
     IssueLabels insert IssueLabel(owner, repository, issueId, labelId)
+  }
 
-  def deleteIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session) =
+  def deleteIssueLabel(owner: String, repository: String, issueId: Int, labelId: Int)(implicit s: Session): Int = {
     IssueLabels filter(_.byPrimaryKey(owner, repository, issueId, labelId)) delete
+  }
 
   def createComment(owner: String, repository: String, loginUser: String,
       issueId: Int, content: String, action: String)(implicit s: Session): Int = {
@@ -291,29 +301,30 @@
       updatedDate       = currentDate)
   }
 
-  def updateIssue(owner: String, repository: String, issueId: Int, title: String, content: Option[String])(implicit s: Session) = {
+  def updateIssue(owner: String, repository: String, issueId: Int, title: String, content: Option[String])(implicit s: Session): Int = {
     Issues
       .filter (_.byPrimaryKey(owner, repository, issueId))
       .map { t => (t.title, t.content.?, t.updatedDate) }
       .update (title, content, currentDate)
   }
 
-  def updateAssignedUserName(owner: String, repository: String, issueId: Int,
-                             assignedUserName: Option[String])(implicit s: Session) =
+  def updateAssignedUserName(owner: String, repository: String, issueId: Int, assignedUserName: Option[String])(implicit s: Session): Int = {
     Issues.filter (_.byPrimaryKey(owner, repository, issueId)).map(_.assignedUserName?).update (assignedUserName)
+  }
 
-  def updateMilestoneId(owner: String, repository: String, issueId: Int,
-                        milestoneId: Option[Int])(implicit s: Session) =
+  def updateMilestoneId(owner: String, repository: String, issueId: Int, milestoneId: Option[Int])(implicit s: Session): Int = {
     Issues.filter (_.byPrimaryKey(owner, repository, issueId)).map(_.milestoneId?).update (milestoneId)
+  }
 
-  def updateComment(commentId: Int, content: String)(implicit s: Session) = {
+  def updateComment(commentId: Int, content: String)(implicit s: Session): Int = {
     IssueComments.filter (_.byPrimaryKey(commentId)).map(t => (t.content, t.updatedDate)).update(content, currentDate)
   }
 
-  def deleteComment(commentId: Int)(implicit s: Session) =
+  def deleteComment(commentId: Int)(implicit s: Session): Int = {
     IssueComments filter (_.byPrimaryKey(commentId)) delete
+  }
 
-  def updateClosed(owner: String, repository: String, issueId: Int, closed: Boolean)(implicit s: Session) = {
+  def updateClosed(owner: String, repository: String, issueId: Int, closed: Boolean)(implicit s: Session): Int = {
     (Issues filter (_.byPrimaryKey(owner, repository, issueId)) map(t => (t.closed, t.updatedDate))).update((closed, currentDate))
   }
 
@@ -325,8 +336,7 @@
    * @param query the keywords separated by whitespace.
    * @return issues with comment count and matched content of issue or comment
    */
-  def searchIssuesByKeyword(owner: String, repository: String, query: String)
-                           (implicit s: Session): List[(Issue, Int, String)] = {
+  def searchIssuesByKeyword(owner: String, repository: String, query: String)(implicit s: Session): List[(Issue, Int, String)] = {
     //import slick.driver.JdbcDriver.likeEncode
     val keywords = splitWords(query.toLowerCase)
 
@@ -374,7 +384,7 @@
     }.toList
   }
 
-  def closeIssuesFromMessage(message: String, userName: String, owner: String, repository: String)(implicit s: Session) = {
+  def closeIssuesFromMessage(message: String, userName: String, owner: String, repository: String)(implicit s: Session): Unit = {
     extractCloseId(message).foreach { issueId =>
       for(issue <- getIssue(owner, repository, issueId) if !issue.closed){
         createComment(owner, repository, userName, issue.issueId, "Close", "close")
@@ -383,7 +393,7 @@
     }
   }
 
-  def createReferComment(owner: String, repository: String, fromIssue: Issue, message: String, loginAccount: Account)(implicit s: Session) = {
+  def createReferComment(owner: String, repository: String, fromIssue: Issue, message: String, loginAccount: Account)(implicit s: Session): Unit = {
     extractIssueId(message).foreach { issueId =>
       val content = fromIssue.issueId + ":" + fromIssue.title
       if(getIssue(owner, repository, issueId).isDefined){
@@ -395,7 +405,7 @@
     }
   }
 
-  def createIssueComment(owner: String, repository: String, commit: CommitInfo)(implicit s: Session) = {
+  def createIssueComment(owner: String, repository: String, commit: CommitInfo)(implicit s: Session): Unit = {
     extractIssueId(commit.fullMessage).foreach { issueId =>
       if(getIssue(owner, repository, issueId).isDefined){
         getAccountByMailAddress(commit.committerEmailAddress).foreach { account =>
diff --git a/src/main/scala/gitbucket/core/service/MergeService.scala b/src/main/scala/gitbucket/core/service/MergeService.scala
index d58a4ec..a581300 100644
--- a/src/main/scala/gitbucket/core/service/MergeService.scala
+++ b/src/main/scala/gitbucket/core/service/MergeService.scala
@@ -2,7 +2,7 @@
 
 import gitbucket.core.model.Account
 import gitbucket.core.util.Directory._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 
 import org.eclipse.jgit.merge.MergeStrategy
 import org.eclipse.jgit.api.Git
diff --git a/src/main/scala/gitbucket/core/service/PullRequestService.scala b/src/main/scala/gitbucket/core/service/PullRequestService.scala
index a512d2c..3807e55 100644
--- a/src/main/scala/gitbucket/core/service/PullRequestService.scala
+++ b/src/main/scala/gitbucket/core/service/PullRequestService.scala
@@ -4,7 +4,7 @@
 import gitbucket.core.model.Profile._
 import gitbucket.core.model.Profile.profile.blockingApi._
 import difflib.{Delta, DiffUtils}
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.JGitUtil
diff --git a/src/main/scala/gitbucket/core/service/RepositoryCreationService.scala b/src/main/scala/gitbucket/core/service/RepositoryCreationService.scala
index c040851..7381bbc 100644
--- a/src/main/scala/gitbucket/core/service/RepositoryCreationService.scala
+++ b/src/main/scala/gitbucket/core/service/RepositoryCreationService.scala
@@ -1,7 +1,7 @@
 package gitbucket.core.service
 
 import gitbucket.core.model.Profile.profile.blockingApi._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Directory._
 import gitbucket.core.util.JGitUtil
 import gitbucket.core.model.Account
diff --git a/src/main/scala/gitbucket/core/service/RepositorySearchService.scala b/src/main/scala/gitbucket/core/service/RepositorySearchService.scala
index a104414..d08c7bc 100644
--- a/src/main/scala/gitbucket/core/service/RepositorySearchService.scala
+++ b/src/main/scala/gitbucket/core/service/RepositorySearchService.scala
@@ -4,7 +4,7 @@
 import gitbucket.core.util._
 import gitbucket.core.util.StringUtil
 import Directory._
-import ControlUtil._
+import SyntaxSugars._
 import org.eclipse.jgit.revwalk.RevWalk
 import org.eclipse.jgit.treewalk.TreeWalk
 import org.eclipse.jgit.lib.FileMode
diff --git a/src/main/scala/gitbucket/core/service/RepositoryService.scala b/src/main/scala/gitbucket/core/service/RepositoryService.scala
index 85d6832..9b5a1bf 100644
--- a/src/main/scala/gitbucket/core/service/RepositoryService.scala
+++ b/src/main/scala/gitbucket/core/service/RepositoryService.scala
@@ -2,7 +2,7 @@
 
 import gitbucket.core.controller.Context
 import gitbucket.core.util._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.model.{Account, Collaborator, Repository, RepositoryOptions, Role}
 import gitbucket.core.model.Profile._
 import gitbucket.core.model.Profile.profile.blockingApi._
@@ -206,7 +206,7 @@
 
   /**
    * Returns the specified repository information.
-   * 
+   *
    * @param userName the user name of the repository owner
    * @param repositoryName the repository name
    * @return the repository information
diff --git a/src/main/scala/gitbucket/core/service/SystemSettingsService.scala b/src/main/scala/gitbucket/core/service/SystemSettingsService.scala
index a04f690..1647cba 100644
--- a/src/main/scala/gitbucket/core/service/SystemSettingsService.scala
+++ b/src/main/scala/gitbucket/core/service/SystemSettingsService.scala
@@ -1,9 +1,9 @@
 package gitbucket.core.service
 
-import gitbucket.core.util.{Directory, ControlUtil}
+import gitbucket.core.util.{Directory, SyntaxSugars}
 import gitbucket.core.util.Implicits._
 import Directory._
-import ControlUtil._
+import SyntaxSugars._
 import SystemSettingsService._
 import javax.servlet.http.HttpServletRequest
 
diff --git a/src/main/scala/gitbucket/core/service/WikiService.scala b/src/main/scala/gitbucket/core/service/WikiService.scala
index 1bff5dc..c5dad27 100644
--- a/src/main/scala/gitbucket/core/service/WikiService.scala
+++ b/src/main/scala/gitbucket/core/service/WikiService.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.model.Account
 import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.util._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.treewalk.CanonicalTreeParser
 import org.eclipse.jgit.lib._
@@ -17,10 +17,10 @@
 import scala.collection.JavaConverters._
 
 object WikiService {
-  
+
   /**
    * The model for wiki page.
-   * 
+   *
    * @param name the page name
    * @param content the page content
    * @param committer the last committer
@@ -28,10 +28,10 @@
    * @param id the latest commit id
    */
   case class WikiPageInfo(name: String, content: String, committer: String, time: Date, id: String)
-  
+
   /**
    * The model for wiki page history.
-   * 
+   *
    * @param name the page name
    * @param committer the committer the committer
    * @param message the commit message
diff --git a/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala b/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
index ed14f30..903a1d9 100644
--- a/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
+++ b/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
@@ -8,7 +8,7 @@
 import org.apache.commons.io.{FileUtils, IOUtils}
 import org.json4s.jackson.Serialization._
 import org.apache.http.HttpStatus
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 
 /**
  * Provides GitLFS Transfer API
diff --git a/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala b/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
index e84bf9e..c4ffe41 100644
--- a/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
@@ -10,7 +10,7 @@
 import gitbucket.core.service.IssuesService.IssueSearchCondition
 import gitbucket.core.service.WebHookService._
 import gitbucket.core.service._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util._
 import org.eclipse.jgit.api.Git
@@ -27,7 +27,7 @@
 
 /**
  * Provides Git repository via HTTP.
- * 
+ *
  * This servlet provides only Git repository functionality.
  * Authentication is provided by [[GitAuthenticationFilter]].
  */
@@ -174,7 +174,7 @@
   extends PostReceiveHook with PreReceiveHook
   with RepositoryService with AccountService with IssuesService with ActivityService with PullRequestService with WebHookService
   with WebHookPullRequestService with CommitsService {
-  
+
   private val logger = LoggerFactory.getLogger(classOf[CommitLogHook])
   private var existIds: Seq[String] = Nil
 
diff --git a/src/main/scala/gitbucket/core/ssh/GitCommand.scala b/src/main/scala/gitbucket/core/ssh/GitCommand.scala
index ca1e021..9461803 100644
--- a/src/main/scala/gitbucket/core/ssh/GitCommand.scala
+++ b/src/main/scala/gitbucket/core/ssh/GitCommand.scala
@@ -4,13 +4,13 @@
 import gitbucket.core.plugin.{GitRepositoryRouting, PluginRegistry}
 import gitbucket.core.service.{AccountService, DeployKeyService, RepositoryService, SystemSettingsService}
 import gitbucket.core.servlet.{CommitLogHook, Database}
-import gitbucket.core.util.{ControlUtil, Directory}
+import gitbucket.core.util.{SyntaxSugars, Directory}
 import org.apache.sshd.server.{Command, CommandFactory, Environment, ExitCallback, SessionAware}
 import org.apache.sshd.server.session.ServerSession
 import org.slf4j.LoggerFactory
 import java.io.{File, InputStream, OutputStream}
 
-import ControlUtil._
+import SyntaxSugars._
 import org.eclipse.jgit.api.Git
 import Directory._
 import gitbucket.core.ssh.PublicKeyAuthenticator.AuthType
diff --git a/src/main/scala/gitbucket/core/util/Authenticator.scala b/src/main/scala/gitbucket/core/util/Authenticator.scala
index bbcb339..30e6ae0 100644
--- a/src/main/scala/gitbucket/core/util/Authenticator.scala
+++ b/src/main/scala/gitbucket/core/util/Authenticator.scala
@@ -5,7 +5,7 @@
 import gitbucket.core.model.Role
 import RepositoryService.RepositoryInfo
 import Implicits._
-import ControlUtil._
+import SyntaxSugars._
 
 /**
  * Allows only oneself and administrators.
diff --git a/src/main/scala/gitbucket/core/util/ControlUtil.scala b/src/main/scala/gitbucket/core/util/ControlUtil.scala
deleted file mode 100644
index 74569ac..0000000
--- a/src/main/scala/gitbucket/core/util/ControlUtil.scala
+++ /dev/null
@@ -1,52 +0,0 @@
-package gitbucket.core.util
-
-import org.eclipse.jgit.api.Git
-import scala.util.control.Exception._
-import scala.language.reflectiveCalls
-
-/**
- * Provides control facilities.
- */
-object ControlUtil {
-
-  def defining[A, B](value: A)(f: A => B): B = f(value)
-
-  def using[A <% { def close(): Unit }, B](resource: A)(f: A => B): B =
-    try f(resource) finally {
-      if(resource != null){
-        ignoring(classOf[Throwable]) {
-          resource.close()
-        }
-      }
-    }
-
-  def using[A <% { def close(): Unit }, B <% { def close(): Unit }, C](resource1: A, resource2: B)(f: (A, B) => C): C =
-    try f(resource1, resource2) finally {
-      if(resource1 != null){
-        ignoring(classOf[Throwable]) {
-          resource1.close()
-        }
-      }
-      if(resource2 != null){
-        ignoring(classOf[Throwable]) {
-          resource2.close()
-        }
-      }
-    }
-
-  def using[T](git: Git)(f: Git => T): T =
-    try f(git) finally git.getRepository.close()
-
-  def using[T](git1: Git, git2: Git)(f: (Git, Git) => T): T =
-    try f(git1, git2) finally {
-      git1.getRepository.close()
-      git2.getRepository.close()
-    }
-
-  def ignore[T](f: => Unit): Unit = try {
-    f
-  } catch {
-    case e: Exception => ()
-  }
-
-}
diff --git a/src/main/scala/gitbucket/core/util/FileUtil.scala b/src/main/scala/gitbucket/core/util/FileUtil.scala
index d6947c0..4f2a21d 100644
--- a/src/main/scala/gitbucket/core/util/FileUtil.scala
+++ b/src/main/scala/gitbucket/core/util/FileUtil.scala
@@ -3,7 +3,7 @@
 import org.apache.commons.io.FileUtils
 import org.apache.tika.Tika
 import java.io.File
-import ControlUtil._
+import SyntaxSugars._
 import scala.util.Random
 
 object FileUtil {
diff --git a/src/main/scala/gitbucket/core/util/JDBCUtil.scala b/src/main/scala/gitbucket/core/util/JDBCUtil.scala
index f94b341..ffb39ef 100644
--- a/src/main/scala/gitbucket/core/util/JDBCUtil.scala
+++ b/src/main/scala/gitbucket/core/util/JDBCUtil.scala
@@ -3,7 +3,7 @@
 import java.io._
 import java.sql._
 import java.text.SimpleDateFormat
-import ControlUtil._
+import SyntaxSugars._
 import scala.annotation.tailrec
 import scala.collection.mutable.ListBuffer
 
diff --git a/src/main/scala/gitbucket/core/util/JGitUtil.scala b/src/main/scala/gitbucket/core/util/JGitUtil.scala
index 009b043..e15af9b 100644
--- a/src/main/scala/gitbucket/core/util/JGitUtil.scala
+++ b/src/main/scala/gitbucket/core/util/JGitUtil.scala
@@ -4,7 +4,7 @@
 import org.eclipse.jgit.api.Git
 import Directory._
 import StringUtil._
-import ControlUtil._
+import SyntaxSugars._
 
 import scala.annotation.tailrec
 import scala.collection.JavaConverters._
@@ -78,7 +78,7 @@
   case class CommitInfo(id: String, shortMessage: String, fullMessage: String, parents: List[String],
                         authorTime: Date, authorName: String, authorEmailAddress: String,
                         commitTime: Date, committerName: String, committerEmailAddress: String){
-    
+
     def this(rev: org.eclipse.jgit.revwalk.RevCommit) = this(
         rev.getName,
         rev.getShortMessage,
@@ -159,7 +159,7 @@
 
   /**
    * Returns RevCommit from the commit or tag id.
-   * 
+   *
    * @param git the Git object
    * @param objectId the ObjectId of the commit or tag
    * @return the RevCommit for the specified commit or tag
@@ -240,7 +240,7 @@
 
   /**
    * Returns the file list of the specified path.
-   * 
+   *
    * @param git the Git object
    * @param revision the branch name or commit id
    * @param path the directory path (optional)
@@ -411,7 +411,7 @@
 
   /**
    * Returns the commit list of the specified branch.
-   * 
+   *
    * @param git the Git object
    * @param revision the branch name or commit id
    * @param page the page number (1-)
@@ -421,7 +421,7 @@
    */
   def getCommitLog(git: Git, revision: String, page: Int = 1, limit: Int = 0, path: String = ""): Either[String, (List[CommitInfo], Boolean)] = {
     val fixedPage = if(page <= 0) 1 else page
-    
+
     @scala.annotation.tailrec
     def getCommitLog(i: java.util.Iterator[RevCommit], count: Int, logs: List[CommitInfo]): (List[CommitInfo], Boolean)  =
       i.hasNext match {
@@ -431,7 +431,7 @@
         }
         case _ => (logs, i.hasNext)
       }
-    
+
     using(new RevWalk(git.getRepository)){ revWalk =>
       defining(git.getRepository.resolve(revision)){ objectId =>
         if(objectId == null){
@@ -469,10 +469,10 @@
     }
   }
 
-  
+
   /**
    * Returns the commit list between two revisions.
-   * 
+   *
    * @param git the Git object
    * @param from the from revision
    * @param to the to revision
@@ -481,10 +481,10 @@
   // TODO swap parameters 'from' and 'to'!?
   def getCommitLog(git: Git, from: String, to: String): List[CommitInfo] =
     getCommitLogs(git, to)(_.getName == from)
-  
+
   /**
    * Returns the latest RevCommit of the specified path.
-   * 
+   *
    * @param git the Git object
    * @param path the path
    * @param revision the branch name or commit id
diff --git a/src/main/scala/gitbucket/core/util/LDAPUtil.scala b/src/main/scala/gitbucket/core/util/LDAPUtil.scala
index 98daddc..65d2279 100644
--- a/src/main/scala/gitbucket/core/util/LDAPUtil.scala
+++ b/src/main/scala/gitbucket/core/util/LDAPUtil.scala
@@ -1,7 +1,7 @@
 package gitbucket.core.util
 
 import gitbucket.core.model.Account
-import ControlUtil._
+import SyntaxSugars._
 import gitbucket.core.service.SystemSettingsService
 import gitbucket.core.service.SystemSettingsService.Ldap
 import com.novell.ldap._
@@ -111,9 +111,9 @@
       }
     }
 
-    val conn: LDAPConnection = 
+    val conn: LDAPConnection =
 	if(ssl) {
-		new LDAPConnection(new LDAPJSSESecureSocketFactory()) 
+		new LDAPConnection(new LDAPJSSESecureSocketFactory())
 	}else {
 		new LDAPConnection(new LDAPJSSEStartTLSFactory())
 	}
diff --git a/src/main/scala/gitbucket/core/util/LockUtil.scala b/src/main/scala/gitbucket/core/util/LockUtil.scala
index 4b13d17..0924719 100644
--- a/src/main/scala/gitbucket/core/util/LockUtil.scala
+++ b/src/main/scala/gitbucket/core/util/LockUtil.scala
@@ -2,7 +2,7 @@
 
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.locks.{ReentrantLock, Lock}
-import ControlUtil._
+import SyntaxSugars._
 
 object LockUtil {
 
diff --git a/src/main/scala/gitbucket/core/util/Notifier.scala b/src/main/scala/gitbucket/core/util/Notifier.scala
index 042ca9f..3c8dba5 100644
--- a/src/main/scala/gitbucket/core/util/Notifier.scala
+++ b/src/main/scala/gitbucket/core/util/Notifier.scala
@@ -13,7 +13,7 @@
 import org.slf4j.LoggerFactory
 import gitbucket.core.controller.Context
 import SystemSettingsService.Smtp
-import ControlUtil.defining
+import SyntaxSugars.defining
 
 trait Notifier extends RepositoryService with AccountService with IssuesService {
 
diff --git a/src/main/scala/gitbucket/core/util/StringUtil.scala b/src/main/scala/gitbucket/core/util/StringUtil.scala
index da7dc50..587df35 100644
--- a/src/main/scala/gitbucket/core/util/StringUtil.scala
+++ b/src/main/scala/gitbucket/core/util/StringUtil.scala
@@ -3,7 +3,7 @@
 import java.net.{URLDecoder, URLEncoder}
 
 import org.mozilla.universalchardet.UniversalDetector
-import ControlUtil._
+import SyntaxSugars._
 import org.apache.commons.io.input.BOMInputStream
 import org.apache.commons.io.IOUtils
 import org.apache.commons.codec.binary.Base64
diff --git a/src/main/scala/gitbucket/core/util/SyntaxSugars.scala b/src/main/scala/gitbucket/core/util/SyntaxSugars.scala
new file mode 100644
index 0000000..1c0384a
--- /dev/null
+++ b/src/main/scala/gitbucket/core/util/SyntaxSugars.scala
@@ -0,0 +1,56 @@
+package gitbucket.core.util
+
+import org.eclipse.jgit.api.Git
+import scala.util.control.Exception._
+import scala.language.reflectiveCalls
+
+/**
+ * Provides control facilities.
+ */
+object SyntaxSugars {
+
+  def defining[A, B](value: A)(f: A => B): B = f(value)
+
+  def using[A <% { def close(): Unit }, B](resource: A)(f: A => B): B =
+    try f(resource) finally {
+      if(resource != null){
+        ignoring(classOf[Throwable]) {
+          resource.close()
+        }
+      }
+    }
+
+  def using[A <% { def close(): Unit }, B <% { def close(): Unit }, C](resource1: A, resource2: B)(f: (A, B) => C): C =
+    try f(resource1, resource2) finally {
+      if(resource1 != null){
+        ignoring(classOf[Throwable]) {
+          resource1.close()
+        }
+      }
+      if(resource2 != null){
+        ignoring(classOf[Throwable]) {
+          resource2.close()
+        }
+      }
+    }
+
+  def using[T](git: Git)(f: Git => T): T =
+    try f(git) finally git.getRepository.close()
+
+  def using[T](git1: Git, git2: Git)(f: (Git, Git) => T): T =
+    try f(git1, git2) finally {
+      git1.getRepository.close()
+      git2.getRepository.close()
+    }
+
+  def ignore[T](f: => Unit): Unit = try {
+    f
+  } catch {
+    case _: Exception => ()
+  }
+
+  object ~ {
+    def unapply[A, B](t: (A, B)): Option[(A, B)] = Some(t)
+  }
+
+}
diff --git a/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala b/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
index 68d4b7f..f9eecd4 100644
--- a/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
+++ b/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
@@ -1,7 +1,7 @@
 package gitbucket.core.service
 
 import gitbucket.core.util.Directory._
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.GitSpecUtil._
 
 import org.eclipse.jgit.api.Git
@@ -119,4 +119,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala b/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
index 7eb7ba5..f5b4769 100644
--- a/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
+++ b/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
@@ -2,7 +2,7 @@
 
 import gitbucket.core.GitBucketCoreModule
 import gitbucket.core.util.{DatabaseConfig, FileUtil}
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 import io.github.gitbucket.solidbase.Solidbase
 import liquibase.database.core.H2Database
 import liquibase.database.jvm.JdbcConnection
diff --git a/src/test/scala/gitbucket/core/util/GitSpecUtil.scala b/src/test/scala/gitbucket/core/util/GitSpecUtil.scala
index 11506c3..7e4d461 100644
--- a/src/test/scala/gitbucket/core/util/GitSpecUtil.scala
+++ b/src/test/scala/gitbucket/core/util/GitSpecUtil.scala
@@ -1,6 +1,6 @@
 package gitbucket.core.util
 
-import gitbucket.core.util.ControlUtil._
+import gitbucket.core.util.SyntaxSugars._
 
 import org.apache.commons.io.FileUtils
 import org.eclipse.jgit.api.Git
diff --git a/src/test/scala/gitbucket/core/view/PaginationSpec.scala b/src/test/scala/gitbucket/core/view/PaginationSpec.scala
index 79da56a..eb23efe 100644
--- a/src/test/scala/gitbucket/core/view/PaginationSpec.scala
+++ b/src/test/scala/gitbucket/core/view/PaginationSpec.scala
@@ -1,7 +1,7 @@
 package gitbucket.core.view
 
-import gitbucket.core.util.ControlUtil
-import ControlUtil._
+import gitbucket.core.util.SyntaxSugars
+import SyntaxSugars._
 import org.scalatest.FunSpec
 
 class PaginationSpec extends FunSpec {