{% macro builder(build, build_output) -%}

  {% if build.tesseract_languages %}
    {% do build_output.x.append("RUN apt update || { echo 'Failed to update apt cache. Exiting...'; exit 1; }") %}
  {% endif %}

  {# Tesseract OCR Languages #}
  {% for lang in build.tesseract_languages %}
    {% set lang_pack = "tesseract-ocr-%s" | format(lang|replace("_", "-")) %}
    {% do build_output.x.append("RUN apt install -y --no-install-recommends %s || { echo 'Failed to install [%s]. Exiting...'; exit 1; }"|format(lang_pack, lang_pack)) %}
  {% endfor %}
{%- endmacro %}