hugo-toha/layouts/partials/helpers/get-hero.html

{{/* check if there is any hero image in the same folder as the markdown file */}}
{{ $heroImage := .Page.Resources.GetMatch "hero.{jpg,png,svg}"}}

{{/*  if hero image is specified in the page front-matter, then use that  */}}
{{ if .Params.hero }}
  {{ $heroImage = .Page.Resources.GetMatch .Params.hero }}
{{ end }}
{{ .Scratch.Set "heroScratch" $heroImage }}

{{/* if hero image is not provided, then use the default hero image */}}
{{ if not $heroImage }}
  {{ $heroImage := resources.Get "images/default-hero.jpg"}}
  {{ .Scratch.Set "heroScratch" $heroImage }}
{{ end }}

{{ $heroImage := .Scratch.Get "heroScratch" }}

{{/* resize hero image. don't resize if the image is an svg */}}
{{ if and $heroImage (ne $heroImage.MediaType.SubType "svg") }}
  {{ $heroImage := $heroImage.Resize "148x" }}
{{ end }}

{{/*  return the hero image  */}}
{{ return $heroImage.RelPermalink }}