First you need to create a filter to your views. Add "Feeds log: Importer id" filter to All entries display / tab. Then this code snippet alters the form so there won't be textfield, but selection.
Source code viewer
function HOOK_form_alter(&$form, &$form_state, $form_id) { // replace HOOK with your module name
// filter feeds log by Importer
if ($form_id == 'views_exposed_form') {
$result = db_query('SELECT * FROM {feeds_importer}');
if ($result -> rowCount() > 0)
foreach ($result as $row) {
$options[$importer['name']] = $importer['name'];
}
}
}Programming Language: PHP