├── README.md
└── alias_generator.rb


/README.md:
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 1 | # Alias Generator for Posts
 2 | 
 3 | Generates redirect pages for posts with aliases set in the YAML Front Matter.
 4 | 
 5 | ## How to Run
 6 | Place `alias_generator.rb` in your `plugins` directory, and ensure
 7 | that you can run custom plugins (set `safe:` to `false` in `_config.yml`).
 8 | Whenever you generate your Jekyll site, redirect pages will be created 
 9 | at the alias path in your output directory; for example,
10 | `_site/post/6301645915/how-i-keep-limited-pressing-running/index.html`.
11 | 
12 | ## How to Use
13 | Place the full path of the alias (place to redirect from) inside the
14 | destination post's YAML Front Matter. One or more aliases may be given.
15 | 
16 | Example Post Configuration:
17 | 
18 |     ---
19 |       layout: post
20 |       title: "How I Keep Limited Pressing Running"
21 |       alias: /post/6301645915/how-i-keep-limited-pressing-running/index.html
22 |     ---
23 | 
24 | Example Post Configuration:
25 | 
26 |     ---
27 |       layout: post
28 |       title: "How I Keep Limited Pressing Running"
29 |       alias: [/first-alias/index.html, /second-alias/index.html]
30 |     ---
31 | 
32 | ## License
33 | 
34 | Released under the MIT license.
35 | 


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/alias_generator.rb:
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  1 | # Alias Generator for Posts.
  2 | #
  3 | # Generates redirect pages for posts with aliases set in the YAML Front Matter.
  4 | #
  5 | # Place the full path of the alias (place to redirect from) inside the
  6 | # destination post's YAML Front Matter. One or more aliases may be given.
  7 | #
  8 | # Example Post Configuration:
  9 | #
 10 | #   ---
 11 | #     layout: post
 12 | #     title: "How I Keep Limited Pressing Running"
 13 | #     alias: /post/6301645915/how-i-keep-limited-pressing-running/index.html
 14 | #   ---
 15 | #
 16 | # Example Post Configuration:
 17 | #
 18 | #   ---
 19 | #     layout: post
 20 | #     title: "How I Keep Limited Pressing Running"
 21 | #     alias: [/first-alias/index.html, /second-alias/index.html]
 22 | #   ---
 23 | #
 24 | # Author: Thomas Mango
 25 | # Site: http://thomasmango.com
 26 | # Plugin Source: http://github.com/tsmango/jekyll_alias_generator
 27 | # Site Source: http://github.com/tsmango/tsmango.github.com
 28 | # Plugin License: MIT
 29 | 
 30 | module Jekyll
 31 | 
 32 |   class AliasGenerator < Generator
 33 | 
 34 |     def generate(site)
 35 |       @site = site
 36 | 
 37 |       process_posts
 38 |       process_pages
 39 |     end
 40 | 
 41 |     def process_posts
 42 |       @site.posts.each do |post|
 43 |         generate_aliases(post.url, post.data['alias'])
 44 |       end
 45 |     end
 46 | 
 47 |     def process_pages
 48 |       @site.pages.each do |page|
 49 |         generate_aliases(page.destination('').gsub(/index\.(html|htm)$/, ''), page.data['alias'])
 50 |       end
 51 |     end
 52 | 
 53 |     def generate_aliases(destination_path, aliases)
 54 |       alias_paths ||= Array.new
 55 |       alias_paths << aliases
 56 |       alias_paths.compact!
 57 | 
 58 |       alias_paths.flatten.each do |alias_path|
 59 |         alias_path = File.join('/', alias_path.to_s)
 60 | 
 61 |         alias_dir  = File.extname(alias_path).empty? ? alias_path : File.dirname(alias_path)
 62 |         alias_file = File.extname(alias_path).empty? ? "index.html" : File.basename(alias_path)
 63 | 
 64 |         fs_path_to_dir = File.join(@site.dest, alias_dir)
 65 |         alias_sections = alias_dir.split('/')[1..-1]
 66 | 
 67 |         FileUtils.mkdir_p(fs_path_to_dir)
 68 | 
 69 |         File.open(File.join(fs_path_to_dir, alias_file), 'w') do |file|
 70 |           file.write(alias_template(destination_path))
 71 |         end
 72 | 
 73 |         alias_sections.size.times do |sections|
 74 |           @site.static_files << Jekyll::AliasFile.new(@site, @site.dest, alias_sections[0, sections + 1].join('/'), '')
 75 |         end
 76 |         @site.static_files << Jekyll::AliasFile.new(@site, @site.dest, alias_dir, alias_file)
 77 |       end
 78 |     end
 79 | 
 80 |     def alias_template(destination_path)
 81 |       <<-EOF
 82 |       <!DOCTYPE html>
 83 |       <html>
 84 |       <head>
 85 |       <link rel="canonical" href="#{destination_path}"/>
 86 |       <meta http-equiv="content-type" content="text/html; charset=utf-8" />
 87 |       <meta http-equiv="refresh" content="0;url=#{destination_path}" />
 88 |       </head>
 89 |       </html>
 90 |       EOF
 91 |     end
 92 |   end
 93 | 
 94 |   class AliasFile < StaticFile
 95 |     require 'set'
 96 | 
 97 |     def modified?
 98 |       return false
 99 |     end
100 | 
101 |     def write(dest)
102 |       return true
103 |     end
104 |   end
105 | end
106 | 


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