Ask user what to do with child pages when deleting a parent wiki page (#3202).

3 options are available:
* move child pages as root pages
* move child pages to another parent page
* delete all descendants

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2676 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/wiki_controller.rb

@@ -131,9 +131,31 @@ class WikiController < ApplicationController
     render_404 unless @annotate
   end
   
-  # remove a wiki page and its history
+  # Removes a wiki page and its history
+  # Children can be either set as root pages, removed or reassigned to another parent page
   def destroy
     return render_403 unless editable?
+    
+    @descendants_count = @page.descendants.size
+    if @descendants_count > 0
+      case params[:todo]
+      when 'nullify'
+        # Nothing to do
+      when 'destroy'
+        # Removes all its descendants
+        @page.descendants.each(&:destroy)
+      when 'reassign'
+        # Reassign children to another parent page
+        reassign_to = @wiki.pages.find_by_id(params[:reassign_to_id].to_i)
+        return unless reassign_to
+        @page.children.each do |child|
+          child.update_attribute(:parent, reassign_to)
+        end
+      else
+        @reassignable_to = @wiki.pages - @page.self_and_descendants
+        return
+      end
+    end
     @page.destroy
     redirect_to :action => 'special', :id => @project, :page => 'Page_index'
   end