send/app/templates/progress.js

const html = require('choo/html');

const radius = 73;
const oRadius = radius + 10;
const oDiameter = oRadius * 2;
const circumference = 2 * Math.PI * radius;

module.exports = function(progressRatio) {
  const dashOffset = (1 - progressRatio) * circumference;
  const percent = Math.floor(progressRatio * 100);
  const div = html`
  <div class="progress-bar">
    <svg id="progress" width="${oDiameter}" height="${
    oDiameter
  }" viewPort="0 0 ${oDiameter} ${oDiameter}" version="1.1">
      <circle r="${radius}" cx="${oRadius}" cy="${oRadius}" fill="transparent"/>
      <circle id="bar" r="${radius}" cx="${oRadius}" cy="${
    oRadius
  }" fill="transparent" transform="rotate(-90 ${oRadius} ${
    oRadius
  })" stroke-dasharray="${circumference}" stroke-dashoffset="${dashOffset}"/>
      <text class="percentage" text-anchor="middle" x="50%" y="98"><tspan class="percent-number">${
        percent
      }</tspan><tspan class="percent-sign">%</tspan></text>
    </svg>
  </div>
  `;
  return div;
};