Added ability to search contribution using contribution soft custom fields

softcreditcustomfields.php

@@ -149,12 +149,30 @@ function softcreditcustomfields_civicrm_entityTypes(&$entityTypes) {
   _softcreditcustomfields_civix_civicrm_entityTypes($entityTypes);
 }
 
+/**
+ * Implements hook_civicrm_preProcess().
+ *
+ * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_preProcess
+ */
+function softcreditcustomfields_civicrm_preProcess($formName, &$form) {
+  if (in_array($formName, ['CRM_Contribute_Form_Search', 'CRM_Contact_Form_Search_Advanced'])) {
+    $extendsMap = &CRM_Core_BAO_CustomQuery::$extendsMap;
+    $extendsMap['ContributionSoft'] = 'civicrm_contribution_soft';
+  }
+}
+
 /**
  * Implements hook_civicrm_buildForm().
  *
  * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_buildForm
  */
 function softcreditcustomfields_civicrm_buildForm($formName, &$form) {
+  if ('CRM_Contribute_Form_Search' == $formName) {
+    CRM_Contribute_BAO_Query::addCustomFormFields($form, ['ContributionSoft']);
+    CRM_Core_Region::instance('page-footer')->add(array(
+      'template' => "CRM/Contribute/Form/Search/SoftCredit-Search.tpl",
+    ));
+  }
   if ('CRM_Contribute_Form_ContributionView' == $formName) {
     $softCredits = $form->get_template_vars('softContributions');
     if (!empty($softCredits)) {

templates/CRM/Contribute/Form/Search/SoftCredit-Search.tpl

@@ -0,0 +1,14 @@
+{if $contributionSoftGroupTree}
+  <div class="softcredit_custom_groups">
+    <br>
+    {include file="CRM/Custom/Form/Search.tpl" groupTree=$contributionSoftGroupTree showHideLinks=false}
+  </div>
+
+  <script type="text/javascript">
+  {literal}
+    CRM.$(function($) {
+      $('div#contribution_soft_credit_type_wrapper').append($('div.softcredit_custom_groups'));
+    });
+  {/literal}
+  </script>
+{/if}