New Feature: PDFObject and PDF.js support

[stevenjoezhang]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes have been added (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs have been added / updated (for bug fixes / features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Issue Number(s): #442

What is the new behavior?

Description about this pull, in several words...

• Screens with this changes: N/A
• Link to demo site with this changes: N/A

How to use?

1. Install module from https://github.com/theme-next/theme-next-pdf

2. In NexT _config.yml:

# 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

Set enable: true, then create a new blog file e.g.pdf.md contains:

---
title: PDF
categories:
date: 2018-11-03 18:53:16
tags:
pdf: true
---

[](/path/to/your/local/file.pdf)

Then you can preview the pdf file in your blog.

Does this PR introduce a breaking change?

• Yes.
• No.

[ivan-nginx]

Please, create separate repo under https://github.com/theme-next for source/lib/pdf* files. Too many files there and it's third-party feature.

---

Invite to Org was sended...

[stevenjoezhang]

@ivan-nginx Thanks for your invitation. I have created a new repo: https://github.com/theme-next/theme-next-pdf

[ivan-nginx]

@stevenjoezhang good, and check e-mail please.