{{- /*

  This template generates the redirects.json file used to generate 301
  redirects in production. It takes all the redirects defined in
  data/redirects.yml, as well as all the aliases defined in front matter, and
  outputs a simple key-value JSON file:

  {
    "<request-path>": "<redirect-path>",
    ...
  }

  e.g.

  {
    "/engine/reference/builder/": "/reference/dockerfile/",
    ...
  }

  */
-}}

{{- $redirects := newScratch }}
{{- range hugo.Sites -}}
  {{- range .Pages -}}
    {{- if .Params.aliases -}}
      {{- $target := .RelPermalink -}}
      {{- range .Params.aliases -}}
        {{ $redirects.SetInMap "paths" . $target }}
      {{- end -}}
    {{- end -}}
  {{- end -}}
{{- end -}}
{{- range $target, $aliases := hugo.Data.redirects -}}
{{- range $aliases }}
{{- $redirects.SetInMap "paths" . $target -}}
{{- end -}}
{{- end -}}
{{- $opts := dict "noHTMLEscape" true }}
{{- $redirects.Get "paths" | jsonify $opts }}