Start to implement the commit detail page.

src/main/scala/app/RepositoryViewerServlet.scala

@@ -7,7 +7,12 @@ import java.io.File
 import java.util.Date
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.lib._
+import org.eclipse.jgit.revwalk._
 import org.apache.commons.io.FileUtils
+import org.eclipse.jgit.revwalk.RevWalk
+import org.eclipse.jgit.treewalk.CanonicalTreeParser
+import org.eclipse.jgit.diff.DiffEntry.ChangeType
+import org.eclipse.jgit.errors.MissingObjectException
 
 case class RepositoryInfo(owner: String, name: String, url: String, branchList: List[String], tags: List[String])
 
@@ -15,6 +20,8 @@ case class FileInfo(isDirectory: Boolean, name: String, time: Date, message: Str
 
 case class CommitInfo(id: String, time: Date, committer: String, message: String)
 
+case class DiffInfo(changeType: ChangeType, oldPath: String, newPath: String, oldContent: Option[String], newContent: Option[String])
+
 /**
  * The repository viewer.
  */
@@ -64,7 +71,6 @@ class RepositoryViewerServlet extends ServletBase {
   get("/:owner/:repository/commits/:branch"){
     val owner      = params("owner")
     val repository = params("repository")
-    
     val branchName = params("branch")
     val page       = params.getOrElse("page", "1").toInt
     val dir        = getBranchDir(owner, repository, branchName)
@@ -93,10 +99,8 @@ class RepositoryViewerServlet extends ServletBase {
   get("/:owner/:repository/blob/:branch/*"){
     val owner      = params("owner")
     val repository = params("repository")
-    
     val branchName = params("branch")
     val path       = multiParams("splat").head.replaceFirst("^tree/.+?/", "")
-    
     val dir        = getBranchDir(owner, repository, branchName)
     val content    = FileUtils.readFileToString(new File(dir, path), "UTF-8")
     
@@ -107,6 +111,54 @@ class RepositoryViewerServlet extends ServletBase {
       CommitInfo(latestRev.getName, latestRev.getCommitterIdent.getWhen, latestRev.getCommitterIdent.getName, latestRev.getShortMessage))
   }
   
+  /**
+   * Shows details of the specified commit.
+   */
+  get("/:owner/:repository/commit/:id"){
+    val owner      = params("owner")
+    val repository = params("repository")
+    val id         = params("id")
+    
+    val repositoryInfo = getRepositoryInfo(owner, repository)
+    
+    // get branch by commit id
+    val branch = repositoryInfo.branchList.find { branch =>
+      val git = Git.open(getBranchDir(owner, repository, branch))
+      git.log.add(ObjectId.fromString(id)).call.iterator.hasNext
+    }.get
+    
+    val dir = getBranchDir(owner, repository, branch)
+    val git = Git.open(dir)
+    val rev = git.log.add(ObjectId.fromString(id)).call.iterator.next
+    
+    // get diff
+    val reader = git.getRepository.newObjectReader
+    
+    val oldTreeIter = new CanonicalTreeParser
+    oldTreeIter.reset(reader, git.getRepository.resolve(id + "^{tree}"))
+    
+    // TODO specify previous commit
+    val newTreeIter = new CanonicalTreeParser
+    newTreeIter.reset(reader, git.getRepository.resolve("HEAD^{tree}"))
+    
+    import scala.collection.JavaConverters._
+    val diffs = git.diff.setNewTree(newTreeIter).setOldTree(oldTreeIter).call.asScala.map { diff =>
+      DiffInfo(diff.getChangeType, diff.getOldPath, diff.getNewPath,
+          getContent(git, diff.getOldId.toObjectId), 
+          getContent(git, diff.getNewId.toObjectId))
+    }
+    
+    html.commit(branch, 
+        CommitInfo(rev.getName, rev.getCommitterIdent.getWhen, rev.getCommitterIdent.getName, rev.getFullMessage), 
+        repositoryInfo, diffs)
+  }
+  
+  def getContent(git: Git, id: ObjectId): Option[String] = try {
+    Some(new String(git.getRepository.getObjectDatabase.open(id).getBytes()))
+  } catch {
+    case e: MissingObjectException => None
+  }
+  
   /**
    * Returns the repository information. It contains branch names and tag names.
    * 

src/main/scala/view/helpers.scala

@@ -4,14 +4,23 @@ import java.text.SimpleDateFormat
 
 object helpers {
   
-  def datetime(date: Date): String = {
-    new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(date)
-  }
+  /**
+   * Format java.util.Date to "yyyy/MM/dd HH:mm:ss".
+   */
+  def datetime(date: Date): String = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(date)
   
-  def date(date: Date): String = {
-    new SimpleDateFormat("yyyy/MM/dd").format(date)
-  }
+  /**
+   * Format java.util.Date to "yyyy/MM/dd".
+   */
+  def date(date: Date): String = new SimpleDateFormat("yyyy/MM/dd").format(date)
   
+  // TODO escape html tags using HtmlEscapeUtils (Commons Lang)
+  def text(value: String): twirl.api.Html = twirl.api.Html(
+    value.replaceAll(" ", "&nbsp;").replaceAll("\t", "&nbsp;&nbsp;&nbsp;&nbsp;").replaceAll("\n", "<br>"))
+
+  /**
+   * Cut the given string by specified length.
+   */
   def cut(message: String, length: Int): String = {
     if(message.length > length){
       message.substring(0, length) + "..."

src/main/twirl/commit.scala.html

@@ -0,0 +1,41 @@
+@(branch: String, commit: app.CommitInfo, repository: app.RepositoryInfo, diffs: Seq[app.DiffInfo])(implicit context: app.Context)
+@import context._
+@import view.helpers._
+@main(cut(commit.message, 20)){
+  @header(branch, repository)
+  @navtab(branch, repository, "commits")
+  <table class="table table-bordered">
+    <tr>
+      <th>
+        <div>@text(commit.message)</div>
+        <div class="small" style="font-weight: normal;"><span class="description">@branch</span></div>
+      </th>
+    </tr>
+    <tr>
+      <td>
+        <a href="@path/@commit.committer">@commit.committer</a> <span class="description">@datetime(commit.time)</span>
+        <div class="pull-right align-right">
+          <span class="description">commit</span> @commit.id
+        </div>
+      </td>
+    </tr>
+  </table>
+  
+  @diffs.map { diff =>
+    <table class="table table-bordered">
+      <tr>
+        <th style="font-weight: normal;">
+          @diff.newPath
+          <div class="pull-right align-right">
+            <a href="@path/@repository.owner/@repository.name/commit/@commit.id" class="btn btn-small">View file @@ @commit.id.substring(0, 10)</a>
+          </div>
+        </th>
+      </tr>
+      <tr>
+        <td>
+        <pre>@diff.newContent.getOrElse("")</pre>
+        </td>
+      </tr>
+    </table>
+  }
+}

src/main/twirl/commits.scala.html

@@ -23,8 +23,8 @@
             </div>
           </div>
           <div class="pull-right align-right">
-            <a href="" class="btn btn-small monospace">@commit.id.substring(0, 10)@*<i class="icon-circle-arrow-right"></i>*@</a><br>
-            <a href="" class="small">Browse code@*<i class="icon-arrow-right"></i>*@</a>
+            <a href="@path/@repository.owner/@repository.name/commit/@commit.id" class="btn btn-small monospace">@commit.id.substring(0, 10)</a><br>
+            <a href="" class="small">Browse code</a>
           </div>
         </td>
       </tr>

src/main/twirl/files.scala.html

@@ -17,7 +17,7 @@
             @view.helpers.cut(latestCommit.message, 100)
             <div class="pull-right align-right">
               @view.helpers.datetime(latestCommit.time)
-              <a href="">@latestCommit.id.substring(0, 10)</a>
+              <a href="@path/@repository.owner/@repository.name/commit/@latestCommit.id">@latestCommit.id.substring(0, 10)</a>
             </div>
         </div>
       </th>