www.byjp.me/layouts/shortcodes/openlibrary.html

{{ $path := .Page.Path }}
{{ $isbn := "" }}
{{ $key := "" }}

{{ with .Get 0 }}
  {{ if eq (len .) 13 }}
    {{ $isbn = . }}
  {{ else }}
    {{ $key = . }}
  {{ end }}
{{ end }}

{{ $isbn := .Get 0 }}

{{ if not $key }}
  {{ $query := (dict "type" "/type/edition" "isbn_13" $isbn) | jsonify }}
  {{ with resources.GetRemote (printf "https://openlibrary.org/api/things?query=%s" ($query)) }}
    {{ with .Err }}
      {{ errorf "Error grabbing Thing from OpenLibrary: %v" . }}
    {{ else }}
      {{ $thing := .Content | transform.Unmarshal }}
      {{ if and (eq $thing.status "ok") (ge (len $thing.result) 1) }}
        {{ $key = index $thing.result 0 }}
      {{ end }}
    {{ end }}
  {{ else }}
    {{ warnf "Failed to fetch ISBN data from OpenLibrary: %s" $isbn }}
  {{ end }}
{{ end}}

{{ if $key }}
  {{ with resources.GetRemote (printf "https://openlibrary.org/api/get?key=%s" $key) }}
    {{ with .Err }}
      {{ errorf "Error grabbing Book data from OpenLibrary: %v" . }}
    {{ else }}
      {{ $bookObj := .Content | transform.Unmarshal }}
      {{ if eq $bookObj.status "ok" }}
        {{ $isbn = index $bookObj.result.isbn_13 0 }}

        {{ $authors := slice }}
        {{ range $bookObj.result.authors }}
          {{ with resources.GetRemote (printf "https://openlibrary.org/api/get?key=%s" .key) }}
            {{ with .Err }}
              {{ errorf "Error grabbing Author data from OpenLibrary: %v" . }}
            {{ else }}
              {{ $authorObj := .Content | transform.Unmarshal }}
              {{ if eq $authorObj.status "ok" }}
                {{ $authors = $authors | append (dict "name" $authorObj.result.name "url" (printf "https://openlibrary.org%s" $authorObj.result.key)) }}
              {{ end }}
            {{ end }}
          {{ else }}
            {{ warnf "Failed to fetch Author data from OpenLibrary: %s" .key }}
          {{ end }}
        {{ end }}

        {{ $coverURL := (printf "https://covers.openlibrary.org/b/isbn/%s-M.jpg" $isbn)}}
        {{ if not $isbn }}
          {{ $coverURL = printf "https://covers.openlibrary.org/b/id/%.0f-M.jpg" (index $bookObj.result.covers 0) }}
        {{ end }}

        {{- $bookFilename := replaceRE `[^a-z]+` "-" (lower $bookObj.result.title) -}}
        {{- $coverPath := replaceRE `(\.md)?$` (printf "/%s.jpg" $bookFilename) $path -}}
        {{ $cover := "" }}
        {{ with resources.GetRemote $coverURL }}
          {{ with .Err }}
          {{ else }}
            {{ $cover = .Content | resources.FromString $coverPath }}
          {{ end }}
        {{ end }}

        {{ $book := dict "title" $bookObj.result.title "authors" $authors "url" (printf "https://openlibrary.org%s" $key) "cover" $cover }}
        {{ partial "book.html" $book }}
      {{ end }}
    {{ end }}
  {{ else }}
    {{ warnf "Failed to fetch Book data data from OpenLibrary: %s" $key }}
  {{ end }}
{{ end }}