Replace String#format() with string interpolation.

src/main/scala/util/Directory.scala

@@ -13,13 +13,13 @@ object Directory {
 
   val GitBucketConf = new File(GitBucketHome, "gitbucket.conf")
   
-  val RepositoryHome = "%s/repositories".format(GitBucketHome)
+  val RepositoryHome = s"${GitBucketHome}/repositories"
   
   /**
    * Repository names of the specified user.
    */
   def getRepositories(owner: String): List[String] = {
-    val dir = new File("%s/%s".format(RepositoryHome, owner))
+    val dir = new File(s"${RepositoryHome}/${owner}")
     if(dir.exists){
       dir.listFiles.filter { file =>
         file.isDirectory && !file.getName.endsWith(".wiki.git") 
@@ -33,24 +33,24 @@ object Directory {
    * Substance directory of the repository.
    */
   def getRepositoryDir(owner: String, repository: String): File =
-    new File("%s/%s/%s.git".format(RepositoryHome, owner, repository))
+    new File(s"${RepositoryHome}/${owner}/${repository}.git")
 
   /**
    * Directory for uploaded files by the specified user.
    */
-  def getUserUploadDir(userName: String): File = new File("%s/data/%s/files".format(GitBucketHome, userName))
+  def getUserUploadDir(userName: String): File = new File(s"${GitBucketHome}/data/${userName}/files")
 
   /**
    * Root of temporary directories for the specified repository.
    */
   def getTemporaryDir(owner: String, repository: String): File =
-    new File("%s/tmp/%s/%s".format(GitBucketHome, owner, repository))
+    new File(s"${GitBucketHome}/tmp/${owner}/${repository}")
 
   /**
    * Temporary directory which is used to create an archive to download repository contents.
    */
   def getDownloadWorkDir(owner: String, repository: String, sessionId: String): File = 
-    new File(getTemporaryDir(owner, repository), "download/%s".format(sessionId))
+    new File(getTemporaryDir(owner, repository), s"download/${sessionId}")
   
   /**
    * Temporary directory which is used in the repository creation.
@@ -65,7 +65,7 @@ object Directory {
    * Substance directory of the wiki repository.
    */
   def getWikiRepositoryDir(owner: String, repository: String): File =
-    new File("%s/%s/%s.wiki.git".format(Directory.RepositoryHome, owner, repository))
+    new File(s"${RepositoryHome}/${owner}/${repository}.wiki.git")
   
   /**
    * Wiki working directory which is cloned from the wiki repository.

src/main/scala/util/FileUploadUtil.scala

@@ -11,7 +11,7 @@ object FileUploadUtil {
     new SimpleDateFormat("yyyyMMddHHmmSSsss").format(new java.util.Date(System.currentTimeMillis))
 
   def TemporaryDir(implicit session: HttpSession): java.io.File =
-    new java.io.File(GitBucketHome, "tmp/_upload/%s".format(session.getId))
+    new java.io.File(GitBucketHome, s"tmp/_upload/${session.getId}")
 
   def getTemporaryFile(fileId: String)(implicit session: HttpSession): java.io.File =
     new java.io.File(TemporaryDir, fileId)

src/main/scala/util/JGitUtil.scala

@@ -153,7 +153,7 @@ object JGitUtil {
         }
 
         RepositoryInfo(
-          owner, repository, baseUrl + "/git/%s/%s.git".format(owner, repository),
+          owner, repository, s"${baseUrl}/git/${owner}/${repository}.git",
           // commit count
           commitCount,
           // branches
@@ -169,7 +169,7 @@ object JGitUtil {
       } catch {
         // not initialized
         case e: NoHeadException => RepositoryInfo(
-          owner, repository, baseUrl + "/git/%s/%s.git".format(owner, repository), 0, Nil, Nil)
+          owner, repository, s"${baseUrl}/git/${owner}/${repository}.git", 0, Nil, Nil)
 
       }
     }

src/main/scala/util/Validations.scala

@@ -11,9 +11,9 @@ trait Validations {
   def identifier: Constraint = new Constraint(){
     def validate(name: String, value: String): Option[String] =
       if(!value.matches("^[a-zA-Z0-9\\-_]+$")){
-        Some("%s contains invalid character.".format(name))
+        Some(s"${name} contains invalid character.")
       } else if(value.startsWith("_") || value.startsWith("-")){
-        Some("%s starts with invalid character.".format(name))
+        Some(s"${name} starts with invalid character.")
       } else {
         None
       }