<!doctype html>
{{- $reveal_cdn := $.Param "reveal_hugo.reveal_cdn" | default "/reveal-js" -}}
{{- $highlight_cdn := $.Param "reveal_hugo.highlight_cdn" | default "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles" -}}
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>{{ or .Page.Title .Site.Title }}</title>
    {{ with $.Param "description" }}<meta name="description" content="{{ . }}">{{ end }}
    {{ with .Site.Author.name }}<meta name="author" content="{{ . }}">{{ end }}
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="{{ $reveal_cdn }}/css/reveal.css">
    <!-- Theme used for presentation -->
    {{- $theme := $.Param "reveal_hugo.theme" | default "black" -}}
    {{- $custom_theme := $.Param "reveal_hugo.custom_theme" -}}
    {{- if $custom_theme -}}
    <link rel="stylesheet" href="{{ $custom_theme | relURL }}" id="theme">
    {{ else -}}
    <link rel="stylesheet" href="{{ $reveal_cdn }}/css/theme/{{ $theme }}.css" id="theme">
    {{- end -}}
    <!-- Theme used for syntax highlighting of code -->
    {{- $highlight_theme := $.Param "reveal_hugo.highlight_theme" | default "default" -}}
    <link rel="stylesheet" href="{{ $highlight_cdn }}/{{ $highlight_theme }}.min.css">
    <!-- Printing and PDF exports -->
    <script>
      var link = document.createElement( 'link' );
      link.rel = 'stylesheet';
      link.type = 'text/css';
      link.href = window.location.search.match( /print-pdf/gi ) ? '{{ $reveal_cdn}}/css/print/pdf.css' : '{{ $reveal_cdn }}/css/print/paper.css';
      document.getElementsByTagName( 'head' )[0].appendChild( link );
    </script>
    <!-- To insert markup before the closing head tag for all presentations,
         create layouts/partials/reveal-hugo/head.html -->
    {{- partial "reveal-hugo/head" . -}}
    <!-- To insert markup at the end of the head tag for a specific presentation,
         create layouts/partials/{section}/reveal-hugo/head.html -->
    {{- $sectionHeadPartial := printf "%s/reveal-hugo/head" (.Page.Section | default "home") -}}
    {{- if fileExists (printf "layouts/partials/%s.html" $sectionHeadPartial) -}}{{ partial $sectionHeadPartial . }}{{- end }}
  </head>
  <body>
    {{- block "main" . -}}{{- end -}}
    <script type="application/json" id="reveal-hugo-site-params">{{ jsonify .Site.Params.reveal_hugo | safeJS }}</script>
    <script type="application/json" id="reveal-hugo-page-params">{{ jsonify .Page.Params.reveal_hugo | safeJS }}</script>
    <script type="text/javascript"> window.revealHugoDependencies = { dependencies: [ { src: '{{ $reveal_cdn }}/lib/js/classList.js', condition: function() { return !document.body.classList; } },
          { src: '{{ $reveal_cdn }}/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
          { src: '{{ $reveal_cdn }}/plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
          { src: '{{ $reveal_cdn }}/plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
          { src: '{{ $reveal_cdn }}/plugin/zoom-js/zoom.js', async: true },
          // the notes plugin can't run off the CDN b/c the HTML file isn't there
          { src: '{{ "reveal-js/plugin/notes/notes.js" | relURL }}', async: true }
      ]};
    </script>
    <script src="{{ $reveal_cdn }}/lib/js/head.min.js"></script>
    <script src="{{ $reveal_cdn }}/js/reveal.js"></script>
    <script type="text/javascript">
      // Hugo lowercases all params and Reveal.js needs camelcase
      // So params in Hugo must be stored in snakecase and we camelize them here
      function camelize(map) {
        if (map) {
          Object.keys(map).forEach(function(k) {
            newK = k.replace(/(\_\w)/g, function(m) { return m[1].toUpperCase() });
            if (newK != k) {
              map[newK] = map[k];
              delete map[k];
            }
          });
        }
        return map;
      }
      // pattern inspired by https://github.com/RealOrangeOne/hugo-theme-revealjs
      var revealHugoDefaults = { center: true, controls: true, history: true, progress: true, transition: "slide" };
      var revealHugoSiteParams = JSON.parse(document.getElementById('reveal-hugo-site-params').innerHTML);
      var revealHugoPageParams = JSON.parse(document.getElementById('reveal-hugo-page-params').innerHTML);
      // See all options - https://github.com/hakimel/reveal.js#configuration
      var options = Object.assign({},
        camelize(revealHugoDefaults),
        camelize(revealHugoSiteParams),
        camelize(revealHugoPageParams),
        revealHugoDependencies);
      Reveal.initialize(options);
    </script>
    <!-- To insert markup before the closing body tag for all presentations,
         create layouts/partials/reveal-hugo/body.html -->
    {{- partial "reveal-hugo/body" . }}
    <!-- To insert markup at the end of the head tag for a specific presentation,
         create layouts/partials/{section}/reveal-hugo/body.html -->
    {{- $sectionBodyPartial := printf "%s/reveal-hugo/body" (.Page.Section | default "home") -}}
    {{- if fileExists (printf "layouts/partials/%s.html" $sectionBodyPartial) -}}{{ partial $sectionBodyPartial . }}{{- end }}
  </body>
</html>
