Provide support for completion filter in search (fixes #2958)

app/ServiceProvider/FilterProvider.php

@@ -14,6 +14,7 @@ use Kanboard\Filter\TaskCategoryFilter;
 use Kanboard\Filter\TaskColorFilter;
 use Kanboard\Filter\TaskColumnFilter;
 use Kanboard\Filter\TaskCommentFilter;
+use Kanboard\Filter\TaskCompletionDateFilter;
 use Kanboard\Filter\TaskCreationDateFilter;
 use Kanboard\Filter\TaskCreatorFilter;
 use Kanboard\Filter\TaskDescriptionFilter;
@@ -156,6 +157,9 @@ class FilterProvider implements ServiceProviderInterface
                 ->withFilter(TaskStartDateFilter::getInstance()
                     ->setDateParser($c['dateParser'])
                 )
+                ->withFilter(TaskCompletionDateFilter::getInstance()
+                    ->setDateparser($c['dateParser'])
+                )
                 ->withFilter(new TaskIdFilter())
                 ->withFilter(TaskLinkFilter::getInstance()
                     ->setDatabase($c['db'])

doc/search.markdown

@@ -106,6 +106,10 @@ Attribute: **description** or **desc**
 
 Example: `description:"text search"`
 
+### Search by completion
+
+Attribute: **completed**
+
 ### Search by external reference
 
 The task reference is an external id of your task, by example a ticket number from another software.