{{/*
  GetImageSrcset

  This partial gets a srcset for a given image.

  @return Slice of sources suitable for use in a srcset attribute. May be empty.

*/}}

{{/* Declare a new variable, $srcset */}}
{{ $srcset := slice }}

{{ with site.Param "breakpoints" }}
    {{ $scratch := newScratch }}
    {{ range $breakpoint := . }}
        {{ $target_width := mul $breakpoint $.target_width }}
        {{/* Default mobile breakpoint for Tachyons is 480 */}}
        {{ if and (ge $breakpoint 480) (ge $.original.Width $target_width) }}
            {{ $breakpoint_image := $.original.Resize (print (math.Round $target_width) "x") }}
            {{ $breakpoint_image_url := (trim $breakpoint_image.RelPermalink "/") | absURL }}
            {{ $scratch.Add "srcset" (slice (print $breakpoint_image_url " " (math.Round $target_width) "w")) }}
        {{ end }}
    {{ end }}
    {{ $srcset = $scratch.Get "srcset" }}
{{ end }}

{{/* Return a srcset. */}}
{{ return $srcset }}