Add search attribute to search by reference

app/Core/Lexer.php

@@ -33,6 +33,8 @@ class Lexer
         "/^(category:)/"                                 => 'T_CATEGORY',
         "/^(column:)/"                                   => 'T_COLUMN',
         "/^(project:)/"                                  => 'T_PROJECT',
+        "/^(ref:)/"                                      => 'T_REFERENCE',
+        "/^(reference:)/"                                => 'T_REFERENCE',
         "/^(\s+)/"                                       => 'T_WHITESPACE',
         '/^([<=>]{0,2}[0-9]{4}-[0-9]{2}-[0-9]{2})/'      => 'T_DATE',
         '/^(yesterday|tomorrow|today)/'                  => 'T_DATE',
@@ -124,6 +126,7 @@ class Lexer
                 case 'T_STATUS':
                 case 'T_DUE':
                 case 'T_DESCRIPTION':
+                case 'T_REFERENCE':
                     $next = next($tokens);
 
                     if ($next !== false && ($next['token'] === 'T_DATE' || $next['token'] === 'T_STRING')) {

app/Model/TaskFilter.php

@@ -68,6 +68,9 @@ class TaskFilter extends Base
                 case 'T_COLUMN':
                     $this->filterByColumnName($value);
                     break;
+                case 'T_REFERENCE':
+                    $this->filterByReference($value);
+                    break;
             }
         }
 
@@ -140,6 +143,22 @@ class TaskFilter extends Base
         return $this;
     }
 
+    /**
+     * Filter by reference
+     *
+     * @access public
+     * @param  string  $reference
+     * @return TaskFilter
+     */
+    public function filterByReference($reference)
+    {
+        if (! empty($reference)) {
+            $this->query->eq(Task::TABLE.'.reference', $reference);
+        }
+
+        return $this;
+    }
+
     /**
      * Filter by title
      *