Convert given measurement into current locale's unit

unit-converter.liquid

{% comment %}
  Measurement translation based on locale
  - US/UK/Myanmar: Imperial (inches, feet)
  - Rest of world: Metric (cm, m)
{% endcomment %}

{% assign current_measurement = "25 inches" %}

{% assign measurement = current_measurement | downcase | strip %}
{% assign locale = request.locale.iso_code | downcase %}

{% comment %} Define imperial system locales {% endcomment %}
{% assign imperial_locales = "en-us,en-gb,my-mm" | split: ',' %}
{% assign uses_imperial = false %}

{% for imperial_locale in imperial_locales %}
  {% if locale contains imperial_locale %}
    {% assign uses_imperial = true %}
    {% break %}
  {% endif %}
{% endfor %}

{% comment %} Extract numeric value and unit {% endcomment %}
{% assign numeric_value = measurement | replace: 'inches', '' | replace: 'inch', '' | replace: 'feet', '' | replace: 'foot', '' | replace: 'meters', '' | replace: 'meter', '' | replace: 'centimeters', '' | replace: 'centimeter', '' | replace: 'ft', '' | replace: 'in', '' | replace: 'm', '' | replace: 'cm', '' | strip | split: ' ' | first %}

{% assign unit = measurement | replace: numeric_value, '' | strip %}

{% comment %} Handle feet and inches format {% endcomment %}
{% if measurement contains 'ft' and measurement contains 'in' %}
  {% assign feet_inches = measurement | split: ' ' %}
  {% assign feet = feet_inches[0] | replace: 'ft', '' | times: 1 %}
  {% assign inches = feet_inches[2] | replace: 'in', '' | times: 1 %}
  {% assign total_inches = feet | times: 12 | plus: inches %}
  
  {% if uses_imperial %}
    {% comment %} Keep in imperial but format consistently {% endcomment %}
    {% capture converted %}{{ feet }}ft {{ inches }}in{% endcapture %}
  {% else %}
    {% comment %} Convert to metric {% endcomment %}
    {% assign cm_value = total_inches | times: 2.54 %}
    {% assign m_value = cm_value | divided_by: 100.0 %}
    {% if cm_value >= 100 %}
      {% capture converted %}{{ m_value | round: 2 }}m{% endcapture %}
    {% else %}
      {% capture converted %}{{ cm_value | round: 1 }}cm{% endcapture %}
    {% endif %}
  {% endif %}

{% else %}
  {% case unit %}
    {% when 'in' or 'inch' or 'inches' %}
      {% if uses_imperial %}
        {% comment %} Keep in inches but format consistently {% endcomment %}
        {% if numeric_value >= 12 %}
          {% assign feet = numeric_value | divided_by: 12 | floor %}
          {% assign remaining_inches = numeric_value | modulo: 12 %}
          {% capture converted %}{{ feet }}ft {{ remaining_inches }}in{% endcapture %}
        {% else %}
          {% capture converted %}{{ numeric_value }}in{% endcapture %}
        {% endif %}
      {% else %}
        {% comment %} Convert to metric {% endcomment %}
        {% assign cm_value = numeric_value | times: 2.54 %}
        {% if cm_value >= 100 %}
          {% assign m_value = cm_value | divided_by: 100.0 %}
          {% capture converted %}{{ m_value | round: 2 }}m{% endcapture %}
        {% else %}
          {% capture converted %}{{ cm_value | round: 1 }}cm{% endcapture %}
        {% endif %}
      {% endif %}
    
    {% when 'cm' or 'centimeter' or 'centimeters' %}
      {% if uses_imperial %}
        {% comment %} Convert to imperial {% endcomment %}
        {% assign inch_value = numeric_value | divided_by: 2.54 %}
        {% if inch_value >= 12 %}
          {% assign feet = inch_value | divided_by: 12 | floor %}
          {% assign remaining_inches = inch_value | modulo: 12 | round %}
          {% capture converted %}{{ feet }}ft {{ remaining_inches }}in{% endcapture %}
        {% else %}
          {% capture converted %}{{ inch_value | round: 1 }}in{% endcapture %}
        {% endif %}
      {% else %}
        {% comment %} Keep in cm but format consistently {% endcomment %}
        {% if numeric_value >= 100 %}
          {% assign m_value = numeric_value | divided_by: 100.0 %}
          {% capture converted %}{{ m_value | round: 2 }}m{% endcapture %}
        {% else %}
          {% capture converted %}{{ numeric_value }}cm{% endcapture %}
        {% endif %}
      {% endif %}
    
    {% when 'm' or 'meter' or 'meters' %}
      {% assign cm_value = numeric_value | times: 100 %}
      {% if uses_imperial %}
        {% comment %} Convert to imperial {% endcomment %}
        {% assign inch_value = cm_value | divided_by: 2.54 %}
        {% if inch_value >= 12 %}
          {% assign feet = inch_value | divided_by: 12 | floor %}
          {% assign remaining_inches = inch_value | modulo: 12 | round %}
          {% capture converted %}{{ feet }}ft {{ remaining_inches }}in{% endcapture %}
        {% else %}
          {% capture converted %}{{ inch_value | round: 1 }}in{% endcapture %}
        {% endif %}
      {% else %}
        {% comment %} Keep in meters but format consistently {% endcomment %}
        {% capture converted %}{{ numeric_value }}m{% endcapture %}
      {% endif %}
    
    {% else %}
      {% capture converted %}Invalid unit{% endcapture %}
  {% endcase %}
{% endif %}

{{ converted }}