//Setup
  export default async function ({login, graphql, q, queries}, {enabled = false} = {}) {
    //Plugin execution
      try {
        //Check if plugin is enabled and requirements are met
          if ((!enabled)||(!q.isocalendar))
            return null
        //Parameters override
          let {"isocalendar.duration":duration = "half-year"} = q
          //Duration in days
            duration = ["full-year", "half-year"].includes(duration) ? duration : "full-year"
        //Compute start day
          const now = new Date()
          const start = new Date(now)
          if (duration === "full-year")
            start.setFullYear(now.getFullYear()-1)
          else
            start.setHours(-24*180)
        //Compute padding to ensure last row is complete
          const padding = new Date(start)
          padding.setHours(-14*24)
        //Retrieve contribution calendar from graphql api
          console.debug(`metrics/compute/${login}/plugins > isocalendar > querying api`)
          const calendar = {}
          for (const [name, from, to] of [["padding", padding, start], ["weeks", start, now]]) {
            console.debug(`metrics/compute/${login}/plugins > isocalendar > loading ${name} from "${from.toISOString()}" to "${to.toISOString()}"`)
            const {user:{calendar:{contributionCalendar:{weeks}}}} = await graphql(queries.calendar({login, from:from.toISOString(), to:to.toISOString()}))
            calendar[name] = weeks
          }
        //Apply padding
          console.debug(`metrics/compute/${login}/plugins > isocalendar > applying padding`)
          const firstweek = calendar.weeks[0].contributionDays
          const padded = calendar.padding.flatMap(({contributionDays}) => contributionDays).filter(({date}) => !firstweek.map(({date}) => date).includes(date))
          while (firstweek.length < 7)
            firstweek.unshift(padded.pop())
        //Compute the highest contributions in a day, streaks and average commits per day
          console.debug(`metrics/compute/${login}/plugins > isocalendar > computing stats`)
          let max = 0, streak = {max:0, current:0}, values = [], average = 0
          for (const week of calendar.weeks) {
            for (const day of week.contributionDays) {
              values.push(day.contributionCount)
              max = Math.max(max, day.contributionCount)
              streak.current = day.contributionCount ? streak.current+1 : 0
              streak.max = Math.max(streak.max, streak.current)
            }
          }
          average = (values.reduce((a, b) => a + b, 0)/values.length).toFixed(2).replace(/[.]0+$/, "")
        //Compute SVG
          console.debug(`metrics/compute/${login}/plugins > isocalendar > computing svg render`)
          const size = 6
          let i = 0, j = 0
          let svg = `
            <svg version="1.1" xmlns="http://www.w3.org/2000/svg" style="margin-top: -52px;" viewBox="0,0 480,${duration === "full-year" ? 270 : 170}">
              ${[1, 2].map(k => `
                <filter id="brightness${k}">
                  <feComponentTransfer>
                    ${[..."RGB"].map(channel => `<feFunc${channel} type="linear" slope="${1-k*0.4}" />`).join("")}
                  </feComponentTransfer>
                </filter>`
              ).join("")}
              <g transform="scale(4) translate(12, 0)">`
          //Iterate through weeks
            for (const week of calendar.weeks) {
              svg += `<g transform="translate(${i*1.7}, ${i})">`
              j = 0
              //Iterate through days
                for (const day of week.contributionDays) {
                  const ratio = day.contributionCount/max
                  svg += `
                    <g transform="translate(${j*-1.7}, ${j+(1-ratio)*size})">
                      <path fill="${day.color}" d="M1.7,2 0,1 1.7,0 3.4,1 z" />
                      <path fill="${day.color}" filter="url(#brightness1)" d="M0,1 1.7,2 1.7,${2+ratio*size} 0,${1+ratio*size} z" />
                      <path fill="${day.color}" filter="url(#brightness2)" d="M1.7,2 3.4,1 3.4,${1+ratio*size} 1.7,${2+ratio*size} z" />
                    </g>`
                  j++
                }
              svg += `</g>`
              i++
            }
          svg += `</g></svg>`
        //Results
          return {streak, max, average, svg, duration}
      }
    //Handle errors
      catch (error) {
        throw {error:{message:"An error occured", instance:error}}
      }
  }