A gist for pagination in Twig, based on the total number of pages, the current page and some URL-settings.

pagination.html.twig

{#
  Source: http://dev.dbl-a.com/symfony-2-0/symfony2-and-twig-pagination/
  Updated by: Simon Schick <[email protected]>

  Parameters:
    * currentFilters (array) : associative array that contains the current route-arguments
    * currentPage (int) : the current page you are in
    * paginationPath (string) : the route name to use for links
    * showAlwaysFirstAndLast (bool) : Always show first and last link (just disabled)
    * lastPage (int) : represents the total number of existing pages
#}
{% spaceless %}
    {% if lastPage > 1 %}

        {# the number of first and last pages to be displayed #}
        {% set extremePagesLimit = 3 %}

        {# the number of pages that are displayed around the active page #}
        {% set nearbyPagesLimit = 2 %}

        <div class="pagination">
            {% if currentPage > 1 %}
                <a href="{{ path(paginationPath, currentFilters|merge({page: currentPage-1})) }}">Previous</a>

                {% for i in range(1, extremePagesLimit) if ( i < currentPage - nearbyPagesLimit ) %}
                    <a href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a>
                {% endfor %}

                {% if extremePagesLimit + 1 < currentPage - nearbyPagesLimit %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(currentPage-nearbyPagesLimit, currentPage-1) if ( i > 0 ) %}
                    <a href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a>
                {% endfor %}
            {% elseif showAlwaysFirstAndLast %}
                <span class="disabled">Previous</span>
            {% endif %}

            <a href="{{ path(paginationPath, currentFilters|merge({ page: currentPage })) }}"
               class="active">{{ currentPage }}</a>

            {% if currentPage < lastPage %}
                {% for i in range(currentPage+1, currentPage + nearbyPagesLimit) if ( i <= lastPage ) %}
                    <a href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a>
                {% endfor %}

                {% if  (lastPage - extremePagesLimit) > (currentPage + nearbyPagesLimit) %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(lastPage - extremePagesLimit+1, lastPage) if ( i > currentPage + nearbyPagesLimit ) %}
                    <a href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a>
                {% endfor %}

                <a href="{{ path(paginationPath, currentFilters|merge({page: currentPage+1})) }}">Next</a>
            {% elseif showAlwaysFirstAndLast %}
                <span class="disabled">Next</span>
            {% endif %}
        </div>
    {% endif %}
{% endspaceless %}

As a warning to newer users Twig is deprecating the if appended to the end of the for statements

Twig 2.10 deprecated the inline if statements in for loops. You now have to use filters instead or move the if inside of the loop:

https://twig.symfony.com/doc/2.x/filters/filter.html#filter

I wish there could be an update for this without the depreciated for statements.

@ulab @AliAkinK I actually fixed this problem years ago but never thought about uploading it here, if anyone is still interested:
I'm actually still actively using it, and it works quite well :)

{#
  Source: http://dev.dbl-a.com/symfony-2-0/symfony2-and-twig-pagination/
  Updated by: Simon Schick <[email protected]>
  Parameters:
    * currentFilters (array) : associative array that contains the current route-arguments
    * currentPage (int) : the current page you are in
    * paginationPath (string) : the route name to use for links
    * showAlwaysFirstAndLast (bool) : Always show first and last link (just disabled)
    * lastPage (int) : represents the total number of existing pages
#}
{% apply spaceless %}
    {% if lastPage > 1 %}

        {# the number of first and last pages to be displayed #}
        {% set extremePagesLimit = 3 %}

        {# the number of pages that are displayed around the active page #}
        {% set nearbyPagesLimit = 2 %}

        {% if currentFilters is not defined %}{% set currentFilters = app.request.attributes.get('_route_params')|merge(app.request.query.all) %}{% endif %}
        {% if paginationPath is not defined %}{% set paginationPath = app.request.attributes.get('_route') %}{% endif %}
        {% if showAlwaysFirstAndLast is not defined %}{% set showAlwaysFirstAndLast = true %}{% endif %}

        <nav aria-label="Page navigation">
        <ul class="pagination">
            {% if currentPage > 1 %}
                <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: currentPage-1})) }}">Previous</a></li>

                {% for i in range(1, extremePagesLimit) | filter(i => i < currentPage - nearbyPagesLimit ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                {% if extremePagesLimit + 1 < currentPage - nearbyPagesLimit %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(currentPage-nearbyPagesLimit, currentPage-1) | filter(i => i > 0 ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}
            {% elseif showAlwaysFirstAndLast %}
                <li class="page-item disabled"><a class="page-link" href="#">Previous</a></li>
            {% endif %}

            <li class="page-item active"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({ page: currentPage })) }}">{{ currentPage }}</a></li>

            {% if currentPage < lastPage %}
                {% for i in range(currentPage+1, currentPage + nearbyPagesLimit) | filter(i => i <= lastPage) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                {% if  (lastPage - extremePagesLimit) > (currentPage + nearbyPagesLimit) %}
                    <span class="sep-dots">...</span>
                {% endif %}

                {% for i in range(lastPage - extremePagesLimit+1, lastPage) | filter( i => i > currentPage + nearbyPagesLimit ) %}
                    <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: i})) }}">{{ i }}</a></li>
                {% endfor %}

                <li class="page-item"><a class="page-link" href="{{ path(paginationPath, currentFilters|merge({page: currentPage+1})) }}">Next</a></li>
            {% elseif showAlwaysFirstAndLast %}
                <li class="page-item disabled"><a class="page-link" href="#">Next</a></li>
            {% endif %}
        </ul>
        </nav>
    {% endif %}
{% endapply %}