Milestone deletion is available.

src/main/scala/app/IssuesController.scala

@@ -148,4 +148,18 @@ trait IssuesControllerBase extends ControllerBase {
       }
     }
   })
+
+  get("/:owner/:repository/issues/milestones/:milestoneId/delete")(writableRepository {
+    val owner       = params("owner")
+    val repository  = params("repository")
+    val milestoneId = params("milestoneId").toInt
+
+    getMilestone(owner, repository, milestoneId) match {
+      case None    => NotFound()
+      case Some(m) => {
+        deleteMilestone(owner, repository, milestoneId)
+        redirect("/%s/%s/issues/milestones".format(owner, repository))
+      }
+    }
+  })
 }

src/main/scala/service/IssuesService.scala

@@ -65,6 +65,17 @@ trait IssuesService {
       milestone.dueDate,
       milestone.closedDate)
 
+  def deleteMilestone(owner: String, repository: String, milestoneId: Int): Unit = {
+    Query(Issues)
+      .filter { i => (i.userName is owner.bind) && (i.repositoryName is repository.bind) && (i.milestoneId is milestoneId.bind)}
+      .map    { i => i.milestoneId.? }
+      .update(None)
+
+    Query(Milestones)
+      .filter { i => (i.userName is owner.bind) && (i.repositoryName is repository.bind) && (i.milestoneId is milestoneId.bind)}
+      .delete
+  }
+
   def getMilestone(owner: String, repository: String, milestoneId: Int): Option[Milestone] =
     Query(Milestones)
       .filter(m => (m.userName is owner.bind) && (m.repositoryName is repository.bind) && (m.milestoneId is milestoneId.bind))

src/main/twirl/issues/milestones.scala.html

@@ -54,7 +54,7 @@
                         } else {
                           <a href="@path/@repository.owner/@repository.name/issues/milestones/@milestone.milestoneId/close">Close</a>
                         }
-                        <a href="" class="delete">Delete</a>
+                        <a href="@path/@repository.owner/@repository.name/issues/milestones/@milestone.milestoneId/delete" class="delete">Delete</a>
                       }
                       <a href="">Browse issues</a>
                     </div>
@@ -86,6 +86,13 @@
     </div>
   </div>
 }
+<script>
+$(function(){
+  $('a.delete').click(function(){
+    return confirm('Once you delete this milestone, there is no going back.\nAre you sure?');
+  });
+});
+</script>
 <style type="text/css">
 a.milestone-title {
   font-size: 120%;