New Feature: PDFObject and PDF.js support

_config.yml

@@ -470,6 +470,21 @@ math:
     # CDNJS, provided by cloudflare, maybe the best CDN, but not works in China
     #cdn: //cdnjs.cloudflare.com/ajax/libs/KaTeX/0.7.1/katex.min.css
 
+# PDF Support
+# Dependencies: https://github.com/theme-next/theme-next-pdf
+pdf:
+  enable: false
+
+  # Default(true) will load PDFObject/PDF.js script on demand
+  # That is it only render those page who has 'pdf: true' in Front Matter.
+  # If you set it to false, it will load PDFObject/PDF.js srcipt EVERY PAGE.
+  per_page: true
+
+  pdfobject:
+    # Use 2.1.1 as default, cloudflare as default CDN
+    cdn: //cdnjs.cloudflare.com/ajax/libs/pdfobject/2.1.1/pdfobject.min.js
+    height: 500px
+
 # Han Support
 # Dependencies: https://github.com/theme-next/theme-next-han
 han: false

layout/_layout.swig

@@ -118,5 +118,6 @@
   {% include '_third-party/exturl.swig' %}
   {% include '_third-party/bookmark.swig' %}
   {% include '_third-party/copy-code.swig' %}
+  {% include '_third-party/pdf.swig' %}
 </body>
 </html>

layout/_third-party/pdf.swig

@@ -0,0 +1,46 @@
+{% if theme.pdf.enable %}
+  {% set is_index_has_pdf = false %}
+
+  {# At home, check if there has `pdf: true` post #}
+  {% if is_home() %}
+    {% for post in page.posts %}
+      {% if post.pdf and not is_index_has_pdf %}
+        {% set is_index_has_pdf = true %}
+      {% endif %}
+    {% endfor %}
+  {% endif %}
+
+  {% if not theme.pdf.per_page or (is_index_has_pdf or page.pdf) %}
+    <script type="text/javascript" src="{{ theme.pdf.pdfobject.cdn }}"></script>
+    <script type="text/javascript">
+    var options = {
+      pdfOpenParams: {
+        navpanes: 0,
+        toolbar: 0,
+        statusbar: 0,
+        pagemode: "thumbs",
+        view: "FitV"
+      },
+      PDFJS_URL: "/lib/pdf/web/viewer.html",
+      height: "{{ theme.pdf.pdfobject.height }}"
+    };
+    $("#main a").each(function() {
+      var href = $(this).attr("href");
+      if (!href) return;
+      if (href.endsWith(".pdf") || href.endsWith(".pdf/")) {
+        var id = "pdf" + Math.floor(Math.random() * 10000);
+        $(this).after("<div id='" + id + "'></div>").remove();
+        PDFObject.embed(href, "#" + id, options);
+      }
+    });
+    </script>
+    <style>
+    .pdfobject-container {
+      position: relative;
+      overflow: auto;
+      width: 100%;
+      height: {{ theme.pdf.pdfobject.height }};
+    }
+    </style>
+  {% endif %}
+{% endif %}