tripal_blast/blast_ui.module

<?php
/**
 * @file
 * .module file of TripalD3.
 */

use Drupal\Core\Url;

/**
 * Implements hook_theme().
 * Used by BLAST UI submission forms.
 *
 * @see templates in /templates
 */
function blast_ui_theme($existing, $type, $theme, $path) {  
  $context_links = [
    'link_Nucleotide' => \Drupal::l(t('Nucleotide'), Url::fromRoute('blast_ui.nucleotide')),
    'link_blastn'     => \Drupal::l(t('blastn'),     Url::fromRoute('blast_ui.nucleotide_nucleotide')),
    'link_blastx'     => \Drupal::l(t('blastx'),     Url::fromRoute('blast_ui.nucleotide_protien')),
    'link_Protien'    => \Drupal::l(t('Protein'),    Url::fromRoute('blast_ui.protien')),
    'link_tblastn'    => \Drupal::l(t('tblastn'),    Url::fromRoute('blast_ui.protien_nucleotide')),
    'link_blastp'     => \Drupal::l(t('blastp'),     Url::fromRoute('blast_ui.protien_protien'))
  ];

  $variables = [
    // BLAST UI Menupage.
    'theme-blast-ui-menupage' => [
      'variables' => ['context_links' => $context_links],
      'template'  => 'template-blast-ui-menupage',
    ],
    
  ];

  return $variables;
}