{{- /*
  This is generic function the helps modifying and merging dictionaries, usually used for html attributes
  Logic is executed in order defined below.
  partial "docs/text/mapper" (dict
    "attributes" (cond .IsNamedParams .Params dict)
    "keep" (slice "id" "class" "tabindex" "alt" "title" "loading")
    "set" (dict "href" "https://")
    "merge" (dict "class" "a-class")
    "delimiter" " " // Used when merging values
    "delete" (slice "src")
  )
*/ -}}

{{- $store := newScratch -}}
{{- $allowlist := or (.keep) (slice "id" "class" "tabindex" "dir")}}
{{- range $key, $value := .attributes -}}
  {{- if in $allowlist $key -}}
    {{- $store.Set $key $value -}}
  {{- end -}}
{{- end -}}

{{- range $key, $value := .set -}}
  {{- $store.Set $key (print $value) -}}
{{- end -}}

{{- range $key, $value := .merge -}}
  {{- $merged := (slice) | append $value | append (or (index $.attributes $key) (slice)) -}}
  {{- $delimiter := or ($.delimiter) (" ") }}
  {{- $store.Set $key (delimit $merged $delimiter) -}}
{{- end -}}

{{- range $key := .delete -}}
  {{- $store.Delete $key -}}
{{- end -}}

{{- return $store.Values -}}