From d5970d6274308b01153d3ae7edbe45a49409af99 Mon Sep 17 00:00:00 2001
From: Dawa Ometto <d.ometto@gmail.com>
Date: Sun, 22 Mar 2020 17:40:13 +0100
Subject: [PATCH] Tag compatibility. Resolves #1487 (#1492)

* Add --global-tag-lookup

* Add bin/gollum-migrate-tags

* Add migration tests (not on Travis)
---
 HISTORY.md                                    |   2 +-
 README.md                                     |   3 +-
 bin/gollum                                    | 123 ++++-----
 bin/gollum-migrate-tags                       | 248 ++++++++++++++++++
 gollum.gemspec                                |   2 +-
 test/examples/lotr_migration.git/HEAD         |   1 +
 test/examples/lotr_migration.git/config       |   8 +
 test/examples/lotr_migration.git/description  |   1 +
 .../hooks/applypatch-msg.sample               |  15 ++
 .../hooks/commit-msg.sample                   |  24 ++
 .../hooks/fsmonitor-watchman.sample           | 114 ++++++++
 .../hooks/post-update.sample                  |   8 +
 .../hooks/pre-applypatch.sample               |  14 +
 .../hooks/pre-commit.sample                   |  49 ++++
 .../lotr_migration.git/hooks/pre-push.sample  |  53 ++++
 .../hooks/pre-rebase.sample                   | 169 ++++++++++++
 .../hooks/pre-receive.sample                  |  24 ++
 .../hooks/prepare-commit-msg.sample           |  42 +++
 .../lotr_migration.git/hooks/update.sample    | 128 +++++++++
 test/examples/lotr_migration.git/info/exclude |   6 +
 ...d9bfbc1e908b433669f482566a9377bd8c58cf.idx | Bin 0 -> 1968 bytes
 ...9bfbc1e908b433669f482566a9377bd8c58cf.pack | Bin 0 -> 13683 bytes
 test/examples/lotr_migration.git/packed-refs  |   2 +
 test/examples/lotr_migration.git/shallow      |   1 +
 test/test_migrate.rb                          |  52 ++++
 25 files changed, 1026 insertions(+), 63 deletions(-)
 create mode 100755 bin/gollum-migrate-tags
 create mode 100644 test/examples/lotr_migration.git/HEAD
 create mode 100644 test/examples/lotr_migration.git/config
 create mode 100644 test/examples/lotr_migration.git/description
 create mode 100755 test/examples/lotr_migration.git/hooks/applypatch-msg.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/commit-msg.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/fsmonitor-watchman.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/post-update.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/pre-applypatch.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/pre-commit.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/pre-push.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/pre-rebase.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/pre-receive.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/prepare-commit-msg.sample
 create mode 100755 test/examples/lotr_migration.git/hooks/update.sample
 create mode 100644 test/examples/lotr_migration.git/info/exclude
 create mode 100644 test/examples/lotr_migration.git/objects/pack/pack-a2d9bfbc1e908b433669f482566a9377bd8c58cf.idx
 create mode 100644 test/examples/lotr_migration.git/objects/pack/pack-a2d9bfbc1e908b433669f482566a9377bd8c58cf.pack
 create mode 100644 test/examples/lotr_migration.git/packed-refs
 create mode 100644 test/examples/lotr_migration.git/shallow
 create mode 100644 test/test_migrate.rb

diff --git a/HISTORY.md b/HISTORY.md
index 483758be..ac65657d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,7 +2,7 @@
 
 This is a major new release that substantially cleans up and improves the codebase. It also introduces many new features, bugfixes, and removing major limitations. See [here](https://github.com/gollum/gollum/wiki/5.0-release-notes) for a list of changes.
 
-**Note**: due to changes in the way in which Gollum handles filenames and some other changes, you may have to change some links in your wiki when migrating from gollum 4.x. See the [release notes](https://github.com/gollum/gollum/wiki/5.0-release-notes#migrating-your-wiki) for more details.
+**Note**: due to changes to the way in which Gollum handles filenames, you may have to change some links in your wiki when migrating from gollum 4.x. See the [release notes](https://github.com/gollum/gollum/wiki/5.0-release-notes#migrating-your-wiki) for more details. You may be able to use the `bin/gollum-migrate-tags` script to accomplish this.
 
 Many thanks to all the users who have provided feedback, and everyone who has chipped in in the development process!
 
diff --git a/README.md b/README.md
index 1f43d09d..0b500fb9 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,6 @@ Gollum comes with the following command line options:
 | --assets          |  [PATH]   | Set the path to look for static assets. |
 | --css             | none      | Tell Gollum to inject custom CSS into each page. Uses `custom.css` from repository root.<sup>3,5</sup> |
 | --js              | none      | Tell Gollum to inject custom JS into each page. Uses `custom.js` from repository root.<sup>3,5</sup> |
-| --emoji           | none      | Parse and interpret emoji tags (e.g. `:heart:`) except when the leading colon is backslashed (e.g. `\:heart:`). |
 | --no-edit         | none      | Disable the feature of editing pages. |
 | --follow-renames, --no-follow-renames  | none      | Follow pages across renames in the History view. Default: true.
 | --allow-uploads   | [MODE]    | Enable file uploads. If set to `dir`, Gollum will store all uploads in the `/uploads/` directory in repository root. If set to `page`, Gollum will store each upload at the currently edited page.<sup>4</sup> |
@@ -123,6 +122,8 @@ Gollum comes with the following command line options:
 | --mathjax-config  | [FILE]    | Specify path to a custom MathJax configuration. If not specified, uses the `mathjax.config.js` file from repository root. |
 | --template-dir    | [PATH]    | Specify custom mustache template directory. |
 | --template-page   | none      | Use _Template in root as a template for new pages. Must be committed. |
+| --emoji           | none      | Parse and interpret emoji tags (e.g. `:heart:`) except when the leading colon is backslashed (e.g. `\:heart:`). |
+| --global-tag-lookup | none   |  Match an internal link to 'Foo' with the first page found with that filename, anywhere in the repository. Provides compatibility with Gollum 4.x. |
 | --help            | none      | Display the list of options on the command line. |
 | --version         | none      | Display the current version of Gollum. |
 | --versions        | none      | Display the current version of Gollum and auxiliary gems. |
diff --git a/bin/gollum b/bin/gollum
index a99b5556..473c9954 100755
--- a/bin/gollum
+++ b/bin/gollum
@@ -20,9 +20,9 @@ wiki_options = {
 
 opts = OptionParser.new do |opts|
   # define program name (although this defaults to the name of the file, just in case...)
-  opts.program_name = "gollum"
+  opts.program_name = 'gollum'
 
-  # set basic info for the "--help" command (options will be appended automatically from the below definitions)
+  # set basic info for the '--help' command (options will be appended automatically from the below definitions)
   opts.banner = '
   Gollum is a multi-format Wiki Engine/API/Frontend.
 
@@ -40,32 +40,32 @@ opts = OptionParser.new do |opts|
   OPTIONS'
 
   # define gollum options
-  opts.separator ""
-  opts.separator "  Major:"
+  opts.separator ''
+  opts.separator '  Major:'
 
-  opts.on("-h", "--host [HOST]", "Specify the hostname or IP address to listen on. Default: '0.0.0.0'.") do |host|
+  opts.on('-h', '--host [HOST]', 'Specify the hostname or IP address to listen on. Default: \'0.0.0.0\'.') do |host|
     options[:bind] = host
   end
-  opts.on("-p", "--port [PORT]", "Specify the port to bind Gollum with. Default: '4567'.") do |port|
+  opts.on('-p', '--port [PORT]', 'Specify the port to bind Gollum with. Default: \'4567\'.') do |port|
     begin
-      # don't use "port.to_i" here... it doesn't raise errors which might result in a nice confusion later on
+      # don't use 'port.to_i' here... it doesn't raise errors which might result in a nice confusion later on
       options[:port] = Integer(port)
     rescue ArgumentError
-      puts "Error: '#{port}' is not a valid port number."
+      puts 'Error: '#{port}' is not a valid port number.'
       exit 1
     end
   end
-  opts.on("-c", "--config [FILE]", "Specify path to the Gollum's configuration file.") do |file|
+  opts.on('-c', '--config [FILE]', 'Specify path to the Gollum\'s configuration file.') do |file|
     options[:config] = file
   end
-  opts.on("-r", "--ref [REF]", "Specify the branch to serve. Default: 'master'.") do |ref|
+  opts.on('-r', '--ref [REF]', 'Specify the branch to serve. Default: \'master\'.') do |ref|
     wiki_options[:ref] = ref
   end
-  opts.on("-a", "--adapter [ADAPTER]", "Launch Gollum using a specific git adapter. Default: 'rugged'.") do |adapter|
+  opts.on('-a', '--adapter [ADAPTER]', 'Launch Gollum using a specific git adapter. Default: \'rugged\'.') do |adapter|
     Gollum::GIT_ADAPTER = adapter
   end
-  opts.on("-b", "--base-path [PATH]", "Specify the leading portion of all Gollum URLs (path info). Default: '/'.",
-    "Example: setting this to '/wiki' will make the wiki accessible under 'http://localhost:4567/wiki/'.") do |base_path|
+  opts.on('-b', '--base-path [PATH]', 'Specify the leading portion of all Gollum URLs (path info). Default: \'/\'.',
+    'Example: setting this to \'/wiki\' will make the wiki accessible under \'http://localhost:4567/wiki/\'.') do |base_path|
 
     # first trim a leading slash, if any
     base_path.sub!(/^\/+/, '')
@@ -87,94 +87,97 @@ MSG
     # and finally, let others enjoy our hard work:
     wiki_options[:base_path] = base_path unless base_path.empty?
   end
-  opts.on("--page-file-dir [PATH]", "Specify the subdirectory for all pages. Default: repository root.",
-    "Example: setting this to 'pages' will make Gollum serve only pages at '<git-repo>/pages/*'.") do |path|
+  opts.on('--page-file-dir [PATH]', 'Specify the subdirectory for all pages. Default: repository root.',
+    'Example: setting this to \'pages\' will make Gollum serve only pages at \'<git-repo>/pages/*\'.') do |path|
     wiki_options[:page_file_dir] = path
   end
-  opts.on("--static", "Use static assets. Defaults to false in development/test, defaults to true in production/staging.") do
+  opts.on('--static', 'Use static assets. Defaults to false in development/test, defaults to true in production/staging.') do
     wiki_options[:static] = true
   end
-  opts.on("--no-static", "Do not use static assets (even when in production/staging).") do
+  opts.on('--no-static', 'Do not use static assets (even when in production/staging).') do
     wiki_options[:static] = false
   end
-  opts.on("--assets [PATH]", "Set the path to look for static assets. Only used if --static is set to true, or environment is production/staging. Default: ./public/assets") do |path|
+  opts.on('--assets [PATH]', 'Set the path to look for static assets. Only used if --static is set to true, or environment is production/staging. Default: ./public/assets') do |path|
     wiki_options[:static_assets_path] = path
   end
-  opts.on("--css", "Inject custom CSS into each page. The '<git-repo>/custom.css' file is used (must be committed).") do
+  opts.on('--css', 'Inject custom CSS into each page. The \'<git-repo>/custom.css\' file is used (must be committed).') do
     wiki_options[:css] = true
   end
-  opts.on("--js", "Inject custom JavaScript into each page. The '<git-repo>/custom.js' file is used (must be committed).") do
+  opts.on('--js', 'Inject custom JavaScript into each page. The \'<git-repo>/custom.js\' file is used (must be committed).') do
     wiki_options[:js] = true
   end
-  opts.on("--emoji", "Parse and interpret emoji tags (e.g. :heart:) except when the leading colon is backslashed (e.g. \\:heart:).") do
-    wiki_options[:emoji] = true
-  end
-  opts.on("--no-edit", "Disable the feature of editing pages.")  do
+  opts.on('--no-edit', 'Disable the feature of editing pages.')  do
     wiki_options[:allow_editing] = false
   end
-  opts.on("--follow-renames", "Follow pages across renames in the History view. Default: true.") do
+  opts.on('--follow-renames', 'Follow pages across renames in the History view. Default: true.') do
     wiki_options[:follow_renames] = true
   end
-  opts.on("--no-follow-renames", "Do not follow pages across renames in the History view.") do
+  opts.on('--no-follow-renames', 'Do not follow pages across renames in the History view.') do
     wiki_options[:follow_renames] = false
   end
-  opts.on("--allow-uploads [MODE]", [:dir, :page], "Enable file uploads.",
-    "If set to 'dir', Gollum will store all uploads in the '<git-repo>/uploads/' directory.",
-    "If set to 'page', Gollum will store uploads per page in '<git-repo>/uploads/[pagename]'.") do |mode|
+  opts.on('--allow-uploads [MODE]', [:dir, :page], 'Enable file uploads.',
+    'If set to \'dir\', Gollum will store all uploads in the \'<git-repo>/uploads/\' directory.',
+    'If set to \'page\', Gollum will store uploads per page in \'<git-repo>/uploads/[pagename]\'.') do |mode|
     wiki_options[:allow_uploads]    = true
     wiki_options[:per_page_uploads] = true if mode == :page
   end
-  opts.on("--mathjax", "Enable MathJax (renders mathematical equations).",
-    "By default, uses the 'TeX-AMS-MML_HTMLorMML' config with the 'autoload-all' extension.") do
+  opts.on('--mathjax', 'Enable MathJax (renders mathematical equations).',
+    'By default, uses the \'TeX-AMS-MML_HTMLorMML\' config with the \'autoload-all\' extension.') do
     wiki_options[:mathjax] = true
     wiki_options[:mathjax_config] = 'mathjax.config.js'
   end
-  opts.on("--critic-markup", "Enable support for annotations using CriticMarkup.") do
+  opts.on('--critic-markup', 'Enable support for annotations using CriticMarkup.') do
     wiki_options[:critic_markup] = true
   end
-  opts.on("--irb", "Launch Gollum in 'console mode', with a predefined API.") do
+  opts.on('--irb', 'Launch Gollum in \'console mode\', with a predefined API.') do
     options[:irb] = true
   end
 
-  opts.separator ""
-  opts.separator "  Minor:"
+  opts.separator ''
+  opts.separator '  Minor:'
 
-  opts.on("--h1-title", "Use the first '<h1>' as page title.") do
+  opts.on('--h1-title', 'Use the first \'<h1>\' as page title.') do
     wiki_options[:h1_title] = true
   end
-  opts.on("--no-display-metadata", "Do not render metadata tables in pages.") do
+  opts.on('--no-display-metadata', 'Do not render metadata tables in pages.') do
     wiki_options[:display_metadata] = false
   end
-  opts.on("--user-icons [MODE]", [:gravatar, :identicon], "Use specific user-icons for history view.",
-    "Can be set to 'gravatar' or 'identicon'. Default: standard avatar.") do |mode|
+  opts.on('--user-icons [MODE]', [:gravatar, :identicon], 'Use specific user-icons for history view.',
+    'Can be set to \'gravatar\' or \'identicon\'. Default: standard avatar.') do |mode|
     wiki_options[:user_icons] = mode.to_s
   end
-  opts.on("--template-dir [PATH]", "Specify custom mustache template directory.") do |path|
+  opts.on('--template-dir [PATH]', 'Specify custom mustache template directory.') do |path|
     wiki_options[:template_dir] = path
   end
-  opts.on("--template-page", "Use _Template in root as a template for new pages.") do
+  opts.on('--template-page', 'Use _Template in root as a template for new pages.') do
     wiki_options[:template_page] = true
   end
-  opts.separator ""
-  opts.separator "  Common:"
+  opts.on('--global-tag-lookup', 'Match an internal link to \'Foo\' with the first page found with that filename, anywhere in the repository. Provides compatibility with Gollum 4.x.') do
+    wiki_options[:global_tag_lookup] = true
+  end
+  opts.on('--emoji', 'Parse and interpret emoji tags (e.g. :heart:) except when the leading colon is backslashed (e.g. \\:heart:).') do
+    wiki_options[:emoji] = true
+  end
+  opts.separator ''
+  opts.separator '  Common:'
 
-  opts.on("--help", "Display this message.") do
+  opts.on('--help', 'Display this message.') do
     puts opts
     exit 0
   end
-  opts.on("--version", "Display the current version of Gollum.") do
-    puts "Gollum " + Gollum::VERSION
+  opts.on('--version', 'Display the current version of Gollum.') do
+    puts 'Gollum ' + Gollum::VERSION
   end
-  opts.on("--versions", "Display the current version of Gollum and auxiliary gems.") do
+  opts.on('--versions', 'Display the current version of Gollum and auxiliary gems.') do
     require 'gollum-lib'
-    puts "Gollum " + Gollum::VERSION
-    puts "Running on: #{RUBY_PLATFORM} with Ruby version #{RUBY_VERSION}"
-    puts "Using:"
+    puts 'Gollum ' + Gollum::VERSION
+    puts 'Running on: #{RUBY_PLATFORM} with Ruby version #{RUBY_VERSION}'
+    puts 'Using:'
     loaded_gemspecs =  Gem.loaded_specs
     gollum_gems = ['gollum-lib', 'gollum-rjgit_adapter', 'rjgit', 'gollum-rugged_adapter', 'rugged']
     puts Gem.loaded_specs.select{|name, spec| gollum_gems.include?(name)}.map {|name, spec| "#{name} #{spec.version}"}
     puts "Markdown rendering gem: #{GitHub::Markup::Markdown.implementation_name}"
-    puts "Other renderering gems:"
+    puts 'Other renderering gems:'
     renderer_gems = ['RedCloth', 'org-ruby', 'creole', 'asciidoctor', 'wikicloth']
     renderer_gems.each do |renderer|
       begin
@@ -188,15 +191,15 @@ MSG
   end
 
 
-  opts.separator ""
+  opts.separator ''
 end
 
 # Read command line options into `options` hash
 begin
   opts.parse!
 rescue OptionParser::InvalidOption
-  puts "gollum: #{$!.message}"
-  puts "gollum: try 'gollum --help' for more information"
+  puts 'gollum: #{$!.message}'
+  puts 'gollum: try \'gollum --help\' for more information'
   exit
 end
 
@@ -236,21 +239,21 @@ if options[:irb]
     end
 
     puts
-    puts "Loaded Gollum wiki at:"
+    puts 'Loaded Gollum wiki at:'
     puts "#{File.expand_path(gollum_path).inspect}"
     puts
-    puts "Example API calls:"
+    puts 'Example API calls:'
     puts %(    page = wiki.page('page-name'))
     puts %(    # => <Gollum::Page>)
     puts
     puts %(    page.raw_data)
-    puts %(    # => "# My wiki page")
+    puts %(    # => '# My wiki page')
     puts
     puts %(    page.formatted_data)
-    puts %(    # => "<h1>My wiki page</h1>")
+    puts %(    # => '<h1>My wiki page</h1>')
     puts
-    puts "Full API documentation at:"
-    puts "https://github.com/gollum/gollum-lib"
+    puts 'Full API documentation at:'
+    puts 'https://github.com/gollum/gollum-lib'
     puts
     IRB.start_session(binding)
   rescue Gollum::InvalidGitRepositoryError, Gollum::NoSuchPathError
diff --git a/bin/gollum-migrate-tags b/bin/gollum-migrate-tags
new file mode 100755
index 00000000..241d9001
--- /dev/null
+++ b/bin/gollum-migrate-tags
@@ -0,0 +1,248 @@
+#!/usr/bin/env ruby
+#coding:utf-8
+require 'optparse'
+require 'pathname'
+require 'rubygems'
+
+REPO = ARGV[0] || Dir.pwd
+
+wiki_options = {}
+options = {}
+
+opts = OptionParser.new do |opts|
+opts.banner = <<EOF
+Use this tool to migrate a wiki repository created under Gollum versions 4.x or earlier to a 5.x compatibile repo.
+It finds and repairs Gollum link tags that no longer work under 5.x for two reasons:
+
+* 5.x wiki internal links are case senitive
+* 5.x wiki internal links are no longer 'global'.
+    * NB: you can use the --global-tag-lookup option in gollum >= 5.x to enable 4.x-style global tags.
+
+See https://github.com/gollum/gollum/wiki/5.0-release-notes#filename-handling for more information.
+Usage of this script comes without any warranty.
+
+Note: you can also use this script with the --dry-run option to find broken tags in your wiki.
+
+Usage: gollum-migrate-tags /path/to/repo
+
+NB: without the --write flag, this will be a 'dry run' that doesn't actually make any changes, but outputs the changes that would be made.
+
+You can use the --page-file-dir and --config options as you would normally with gollum.
+
+Requires a non-bare repository. Recommended usage:
+
+1. Clone your wiki's repository to create a backup.
+2. Run this script on your cloned repo. 
+3. If all looks sane, run the script with the --write option. This will overwrite files in your working directory, but not commit the changes, so you have time to review them.
+4. Do a 'git diff' to inspect the changes.
+5. Commit the changes if all looks sane, and push/pull them back into your original repo.
+
+Options:
+EOF
+  opts.on('-c', '--config [FILE]', 'Specify path to the Gollum\'s configuration file.') do |file|
+    options[:config] = file
+  end
+
+  opts.on('--page-file-dir [PATH]', 'Specify the subdirectory for all pages. Default: repository root.') do |path|
+    wiki_options[:page_file_dir] = path
+  end
+  
+  opts.on('--prefer-relative-links', 'When specified, will try to replace broken links with relative links (\'[[Foo/Bar]]\' instead of \'[[/Subdir/Foo/Bar]]\') where possible.') do
+    PREFER_RELATIVE = true
+  end
+  
+  opts.on('--run-silent', 'Don\'t output anything.') do
+    PREFER_RELATIVE = true
+  end
+  
+  opts.on('--write', 'No dry run: actually perform the substitutions.') do
+    NO_DRY_RUN = true
+  end
+end
+
+# Read command line options into `options` hash
+begin
+  opts.parse!
+rescue OptionParser::InvalidOption
+  puts "gollum-migrate-tags: #{$!.message}"
+  puts "gollum-migrate-tags: try 'gollum-migrate-tags --help' for more information"
+  exit
+end
+
+require 'gollum-lib'
+
+if cfg = options[:config]
+  # If the path begins with a '/' it will be considered an absolute path,
+  # otherwise it will be relative to the CWD
+  cfg = File.join(Dir.getwd, cfg) unless cfg.slice(0) == File::SEPARATOR
+  require cfg
+end
+  
+class Gollum::Filter::CodeMigrator < Gollum::Filter::Code
+  def extract(data)
+    case @markup.format
+    when :asciidoc
+      data.gsub!(/^(\[source,([^\r\n]*)\]\n)?----\n(.+?)\n----$/m) do
+        cache_codeblock($~.to_s)
+      end
+    when :org
+      org_headers = %r{([ \t]*#\+HEADER[S]?:[^\r\n]*\n)*}
+      org_name = %r{([ \t]*#\+NAME:[^\r\n]*\n)?}
+      org_lang = %r{[ ]*([^\n \r]*)[ ]*[^\r\n]*}
+      org_begin = %r{([ \t]*)#\+BEGIN_SRC#{org_lang}\r?\n}
+      org_end = %r{\r?\n[ \t]*#\+END_SRC[ \t\r]*}
+      data.gsub!(/^#{org_headers}#{org_name}#{org_begin}(.+?)#{org_end}$/mi) do
+        cache_codeblock($~.to_s)
+      end
+    when :markdown
+      data.gsub!(/^([ ]{0,3})(~~~+) ?([^\r\n]+)?\r?\n(.+?)\r?\n[ ]{0,3}(~~~+)[ \t\r]*$/m) do
+        m_indent = Regexp.last_match[1]
+        m_start  = Regexp.last_match[2] # ~~~
+        m_lang   = Regexp.last_match[3]
+        m_code   = Regexp.last_match[4]
+        m_end    = Regexp.last_match[5] # ~~~
+        # The closing code fence must be at least as long as the opening fence
+        next '' if m_end.length < m_start.length
+        lang = m_lang ? m_lang.strip.split.first : nil
+        cache_codeblock($~.to_s)
+      end  
+    end
+
+    data.gsub!(/^([ ]{0,3})``` ?([^\r\n]+)?\r?\n(.+?)\r?\n[ ]{0,3}```[ \t]*\r?$/m) do
+      cache_codeblock($~.to_s)
+    end
+    data
+  end
+  
+  def process(data)
+    return data if data.nil? || data.size.zero? || @map.size.zero?
+    @map.each do |id, block| ## Just put the code blocks back in verbatim
+      data.gsub!(id, block)
+    end
+    data
+  end
+  
+  def cache_codeblock(block)
+    id = "#{open_pattern}#{Digest::SHA1.hexdigest(block)}#{close_pattern}"
+    @map[id] = block
+    id
+  end
+end
+  
+class ::Gollum::Filter::TagMigrator < Gollum::Filter::Tags
+  def process_tag(tag)
+    link_part, extra = parse_tag_parts(tag)
+    orig_tag = %{[[#{tag}]]}
+    return orig_tag if link_part.nil?
+    
+    img_args = extra ? [extra, link_part] : [link_part]
+    mime = MIME::Types.type_for(::File.extname(img_args.first.to_s)).first
+    
+    # For any kind of tag other than an internal link: just return the tag.
+    if tag =~ /^_TOC_/ || link_part =~ /^_$/ || link_part =~ /^#{INCLUDE_TAG}/ || (mime && mime.content_type =~ /^image/) || process_external_link_tag(link_part, extra) || process_file_link_tag(link_part, extra)
+      return orig_tag
+    end
+
+    # It's an internal Page link tag. Try to find the file/page it links to
+    link = link_part
+    page = find_page_from_path(link)
+    anchor = nil
+    
+    if page.nil? # No match yet, now try finding the page with anchor removed
+      if pos = link.rindex('#')
+        anchor = link[pos..-1]
+        link  = link[0...pos]
+      end
+
+      if link.empty? && anchor # Internal anchor link, don't search for the page but return the original tag
+        return orig_tag
+      end
+
+      page  = find_page_from_path(link)
+    end
+
+    if page
+      # Great, the link is not broken. Return the original tag.
+      return orig_tag
+    else
+      possibles = find_linked(link)
+      if possibles.empty?
+        log(:info, "Found no candidates for broken link: #{orig_tag}")
+        return orig_tag
+      else
+        if possibles.size > 1
+          log(:empty)
+          log(:warn, "Found multiple possibilities for the link '#{orig_tag}':")
+          possibles.map! {|p| Pathname.new(p)}
+          possibles.sort!
+          possibles.each{|p| log(:none, "* #{p}")}
+          log(:warn,"Picking #{possibles.first}")
+          log(:empty)
+        end
+        pick = possibles.first
+        return tag_for_pick(pick, orig_tag, extra, anchor, @markup.page.path)
+      end
+        
+    end
+  end
+  
+  private
+  
+  def tag_for_pick(pick, orig_tag, extra, anchor, linking_page_path)
+    pick = if defined?(PREFER_RELATIVE)
+      overlapping_path = Pathname.new(linking_page_path).dirname.to_s
+      relative_path = pick.to_s.match(/^\/#{overlapping_path}\/(.+)/)
+      relative_path ? relative_path[1] : pick
+    else
+      pick
+    end
+    new_tag = extra.nil? ? %{[[#{pick}]]} : %{[[#{extra}|#{pick}#{anchor}]]}
+    log(:info, "#{@markup.page.path}: Changing #{orig_tag} -> #{new_tag}")
+    return defined?(DRY_RUN) ? orig_tag : new_tag    
+  end
+end
+
+class ::Gollum::Filter::PlainTextMigrator < Gollum::Filter::PlainText
+  def extract(data)
+    data
+  end
+end
+
+filter_chain = [:PlainTextMigrator, :CodeMigrator, :TagMigrator]
+
+wiki = ::Gollum::Wiki.new(REPO, wiki_options.merge({:filter_chain => filter_chain}))
+TREE = wiki.tree_list(wiki.ref, true, false).map {|page| ::File.join('/', page.path)}
+
+def find_linked(link)
+  # If the link has no explicit file extension, test against the link + the '.' character.
+  # This is to avoid that 'Samwi' matches 'Samwise.md'
+  # If it has an explicit file extension ('Samwi.md'), just test against that.
+  test_path = ::File.extname(link).empty? ? /#{link}\..+/ : link
+  # Select pages from the wiki whose path =~ 'Foo/Bar/Samwi.*'
+  # Match case-insenstively to mimic 4.x behavior!
+  TREE.select {|path| path =~ /^\/(.*\/)?#{test_path}/i}
+end
+
+def log(kind, msg = nil)
+  unless defined?(RUN_SILENT)
+    if kind == :none
+      puts msg
+    elsif kind == :empty
+      puts
+    else
+    puts "[#{kind.to_s.upcase}] #{msg}"
+    end
+  end
+end
+
+wiki.pages.each do |page|
+  log(:info,"Page #{page.path}")
+  new_data = page.formatted_data
+  if defined?(NO_DRY_RUN)
+    path = ::File.join([wiki.path, wiki.page_file_dir, page.path].compact)
+    f = File.new(path, 'w')
+    f.write(new_data)
+    f.close
+  end
+  log(:none, "====")
+end
\ No newline at end of file
diff --git a/gollum.gemspec b/gollum.gemspec
index 7b26862c..c66ae883 100644
--- a/gollum.gemspec
+++ b/gollum.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.require_paths = %w[lib]
 
-  s.executables = ['gollum']
+  s.executables = ['gollum', 'gollum-migrate-tags']
 
   s.rdoc_options = ['--charset=UTF-8']
   s.extra_rdoc_files = %w[README.md LICENSE]
diff --git a/test/examples/lotr_migration.git/HEAD b/test/examples/lotr_migration.git/HEAD
new file mode 100644
index 00000000..cb089cd8
--- /dev/null
+++ b/test/examples/lotr_migration.git/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/master
diff --git a/test/examples/lotr_migration.git/config b/test/examples/lotr_migration.git/config
new file mode 100644
index 00000000..e3a55b0d
--- /dev/null
+++ b/test/examples/lotr_migration.git/config
@@ -0,0 +1,8 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true
+	ignorecase = true
+	precomposeunicode = true
+[remote "origin"]
+	url = file:///tmp/lotr
diff --git a/test/examples/lotr_migration.git/description b/test/examples/lotr_migration.git/description
new file mode 100644
index 00000000..498b267a
--- /dev/null
+++ b/test/examples/lotr_migration.git/description
@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.
diff --git a/test/examples/lotr_migration.git/hooks/applypatch-msg.sample b/test/examples/lotr_migration.git/hooks/applypatch-msg.sample
new file mode 100755
index 00000000..a5d7b84a
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/applypatch-msg.sample
@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message taken by
+# applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.  The hook is
+# allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "applypatch-msg".
+
+. git-sh-setup
+commitmsg="$(git rev-parse --git-path hooks/commit-msg)"
+test -x "$commitmsg" && exec "$commitmsg" ${1+"$@"}
+:
diff --git a/test/examples/lotr_migration.git/hooks/commit-msg.sample b/test/examples/lotr_migration.git/hooks/commit-msg.sample
new file mode 100755
index 00000000..b58d1184
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/commit-msg.sample
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message.
+# Called by "git commit" with one argument, the name of the file
+# that has the commit message.  The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit.  The hook is allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "commit-msg".
+
+# Uncomment the below to add a Signed-off-by line to the message.
+# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
+# hook is more suited to it.
+#
+# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
+
+# This example catches duplicate Signed-off-by lines.
+
+test "" = "$(grep '^Signed-off-by: ' "$1" |
+	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
+	echo >&2 Duplicate Signed-off-by lines.
+	exit 1
+}
diff --git a/test/examples/lotr_migration.git/hooks/fsmonitor-watchman.sample b/test/examples/lotr_migration.git/hooks/fsmonitor-watchman.sample
new file mode 100755
index 00000000..e673bb39
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/fsmonitor-watchman.sample
@@ -0,0 +1,114 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use IPC::Open2;
+
+# An example hook script to integrate Watchman
+# (https://facebook.github.io/watchman/) with git to speed up detecting
+# new and modified files.
+#
+# The hook is passed a version (currently 1) and a time in nanoseconds
+# formatted as a string and outputs to stdout all files that have been
+# modified since the given time. Paths must be relative to the root of
+# the working tree and separated by a single NUL.
+#
+# To enable this hook, rename this file to "query-watchman" and set
+# 'git config core.fsmonitor .git/hooks/query-watchman'
+#
+my ($version, $time) = @ARGV;
+
+# Check the hook interface version
+
+if ($version == 1) {
+	# convert nanoseconds to seconds
+	$time = int $time / 1000000000;
+} else {
+	die "Unsupported query-fsmonitor hook version '$version'.\n" .
+	    "Falling back to scanning...\n";
+}
+
+my $git_work_tree;
+if ($^O =~ 'msys' || $^O =~ 'cygwin') {
+	$git_work_tree = Win32::GetCwd();
+	$git_work_tree =~ tr/\\/\//;
+} else {
+	require Cwd;
+	$git_work_tree = Cwd::cwd();
+}
+
+my $retry = 1;
+
+launch_watchman();
+
+sub launch_watchman {
+
+	my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty')
+	    or die "open2() failed: $!\n" .
+	    "Falling back to scanning...\n";
+
+	# In the query expression below we're asking for names of files that
+	# changed since $time but were not transient (ie created after
+	# $time but no longer exist).
+	#
+	# To accomplish this, we're using the "since" generator to use the
+	# recency index to select candidate nodes and "fields" to limit the
+	# output to file names only. Then we're using the "expression" term to
+	# further constrain the results.
+	#
+	# The category of transient files that we want to ignore will have a
+	# creation clock (cclock) newer than $time_t value and will also not
+	# currently exist.
+
+	my $query = <<"	END";
+		["query", "$git_work_tree", {
+			"since": $time,
+			"fields": ["name"],
+			"expression": ["not", ["allof", ["since", $time, "cclock"], ["not", "exists"]]]
+		}]
+	END
+
+	print CHLD_IN $query;
+	close CHLD_IN;
+	my $response = do {local $/; <CHLD_OUT>};
+
+	die "Watchman: command returned no output.\n" .
+	    "Falling back to scanning...\n" if $response eq "";
+	die "Watchman: command returned invalid output: $response\n" .
+	    "Falling back to scanning...\n" unless $response =~ /^\{/;
+
+	my $json_pkg;
+	eval {
+		require JSON::XS;
+		$json_pkg = "JSON::XS";
+		1;
+	} or do {
+		require JSON::PP;
+		$json_pkg = "JSON::PP";
+	};
+
+	my $o = $json_pkg->new->utf8->decode($response);
+
+	if ($retry > 0 and $o->{error} and $o->{error} =~ m/unable to resolve root .* directory (.*) is not watched/) {
+		print STDERR "Adding '$git_work_tree' to watchman's watch list.\n";
+		$retry--;
+		qx/watchman watch "$git_work_tree"/;
+		die "Failed to make watchman watch '$git_work_tree'.\n" .
+		    "Falling back to scanning...\n" if $? != 0;
+
+		# Watchman will always return all files on the first query so
+		# return the fast "everything is dirty" flag to git and do the
+		# Watchman query just to get it over with now so we won't pay
+		# the cost in git to look up each individual file.
+		print "/\0";
+		eval { launch_watchman() };
+		exit 0;
+	}
+
+	die "Watchman: $o->{error}.\n" .
+	    "Falling back to scanning...\n" if $o->{error};
+
+	binmode STDOUT, ":utf8";
+	local $, = "\0";
+	print @{$o->{files}};
+}
diff --git a/test/examples/lotr_migration.git/hooks/post-update.sample b/test/examples/lotr_migration.git/hooks/post-update.sample
new file mode 100755
index 00000000..ec17ec19
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/post-update.sample
@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# An example hook script to prepare a packed repository for use over
+# dumb transports.
+#
+# To enable this hook, rename this file to "post-update".
+
+exec git update-server-info
diff --git a/test/examples/lotr_migration.git/hooks/pre-applypatch.sample b/test/examples/lotr_migration.git/hooks/pre-applypatch.sample
new file mode 100755
index 00000000..4142082b
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/pre-applypatch.sample
@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed
+# by applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-applypatch".
+
+. git-sh-setup
+precommit="$(git rev-parse --git-path hooks/pre-commit)"
+test -x "$precommit" && exec "$precommit" ${1+"$@"}
+:
diff --git a/test/examples/lotr_migration.git/hooks/pre-commit.sample b/test/examples/lotr_migration.git/hooks/pre-commit.sample
new file mode 100755
index 00000000..6a756416
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/pre-commit.sample
@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-commit".
+
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=$(git hash-object -t tree /dev/null)
+fi
+
+# If you want to allow non-ASCII filenames set this variable to true.
+allownonascii=$(git config --bool hooks.allownonascii)
+
+# Redirect output to stderr.
+exec 1>&2
+
+# Cross platform projects tend to avoid non-ASCII filenames; prevent
+# them from being added to the repository. We exploit the fact that the
+# printable range starts at the space character and ends with tilde.
+if [ "$allownonascii" != "true" ] &&
+	# Note that the use of brackets around a tr range is ok here, (it's
+	# even required, for portability to Solaris 10's /usr/bin/tr), since
+	# the square bracket bytes happen to fall in the designated range.
+	test $(git diff --cached --name-only --diff-filter=A -z $against |
+	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
+then
+	cat <<\EOF
+Error: Attempt to add a non-ASCII file name.
+
+This can cause problems if you want to work with people on other platforms.
+
+To be portable it is advisable to rename the file.
+
+If you know what you are doing you can disable this check using:
+
+  git config hooks.allownonascii true
+EOF
+	exit 1
+fi
+
+# If there are whitespace errors, print the offending file names and fail.
+exec git diff-index --check --cached $against --
diff --git a/test/examples/lotr_migration.git/hooks/pre-push.sample b/test/examples/lotr_migration.git/hooks/pre-push.sample
new file mode 100755
index 00000000..6187dbf4
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/pre-push.sample
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# An example hook script to verify what is about to be pushed.  Called by "git
+# push" after it has checked the remote status, but before anything has been
+# pushed.  If this script exits with a non-zero status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local sha1> <remote ref> <remote sha1>
+#
+# This sample shows how to prevent push of commits where the log message starts
+# with "WIP" (work in progress).
+
+remote="$1"
+url="$2"
+
+z40=0000000000000000000000000000000000000000
+
+while read local_ref local_sha remote_ref remote_sha
+do
+	if [ "$local_sha" = $z40 ]
+	then
+		# Handle delete
+		:
+	else
+		if [ "$remote_sha" = $z40 ]
+		then
+			# New branch, examine all commits
+			range="$local_sha"
+		else
+			# Update to existing branch, examine new commits
+			range="$remote_sha..$local_sha"
+		fi
+
+		# Check for WIP commit
+		commit=`git rev-list -n 1 --grep '^WIP' "$range"`
+		if [ -n "$commit" ]
+		then
+			echo >&2 "Found WIP commit in $local_ref, not pushing"
+			exit 1
+		fi
+	fi
+done
+
+exit 0
diff --git a/test/examples/lotr_migration.git/hooks/pre-rebase.sample b/test/examples/lotr_migration.git/hooks/pre-rebase.sample
new file mode 100755
index 00000000..6cbef5c3
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/pre-rebase.sample
@@ -0,0 +1,169 @@
+#!/bin/sh
+#
+# Copyright (c) 2006, 2008 Junio C Hamano
+#
+# The "pre-rebase" hook is run just before "git rebase" starts doing
+# its job, and can prevent the command from running by exiting with
+# non-zero status.
+#
+# The hook is called with the following parameters:
+#
+# $1 -- the upstream the series was forked from.
+# $2 -- the branch being rebased (or empty when rebasing the current branch).
+#
+# This sample shows how to prevent topic branches that are already
+# merged to 'next' branch from getting rebased, because allowing it
+# would result in rebasing already published history.
+
+publish=next
+basebranch="$1"
+if test "$#" = 2
+then
+	topic="refs/heads/$2"
+else
+	topic=`git symbolic-ref HEAD` ||
+	exit 0 ;# we do not interrupt rebasing detached HEAD
+fi
+
+case "$topic" in
+refs/heads/??/*)
+	;;
+*)
+	exit 0 ;# we do not interrupt others.
+	;;
+esac
+
+# Now we are dealing with a topic branch being rebased
+# on top of master.  Is it OK to rebase it?
+
+# Does the topic really exist?
+git show-ref -q "$topic" || {
+	echo >&2 "No such branch $topic"
+	exit 1
+}
+
+# Is topic fully merged to master?
+not_in_master=`git rev-list --pretty=oneline ^master "$topic"`
+if test -z "$not_in_master"
+then
+	echo >&2 "$topic is fully merged to master; better remove it."
+	exit 1 ;# we could allow it, but there is no point.
+fi
+
+# Is topic ever merged to next?  If so you should not be rebasing it.
+only_next_1=`git rev-list ^master "^$topic" ${publish} | sort`
+only_next_2=`git rev-list ^master           ${publish} | sort`
+if test "$only_next_1" = "$only_next_2"
+then
+	not_in_topic=`git rev-list "^$topic" master`
+	if test -z "$not_in_topic"
+	then
+		echo >&2 "$topic is already up to date with master"
+		exit 1 ;# we could allow it, but there is no point.
+	else
+		exit 0
+	fi
+else
+	not_in_next=`git rev-list --pretty=oneline ^${publish} "$topic"`
+	/usr/bin/perl -e '
+		my $topic = $ARGV[0];
+		my $msg = "* $topic has commits already merged to public branch:\n";
+		my (%not_in_next) = map {
+			/^([0-9a-f]+) /;
+			($1 => 1);
+		} split(/\n/, $ARGV[1]);
+		for my $elem (map {
+				/^([0-9a-f]+) (.*)$/;
+				[$1 => $2];
+			} split(/\n/, $ARGV[2])) {
+			if (!exists $not_in_next{$elem->[0]}) {
+				if ($msg) {
+					print STDERR $msg;
+					undef $msg;
+				}
+				print STDERR " $elem->[1]\n";
+			}
+		}
+	' "$topic" "$not_in_next" "$not_in_master"
+	exit 1
+fi
+
+<<\DOC_END
+
+This sample hook safeguards topic branches that have been
+published from being rewound.
+
+The workflow assumed here is:
+
+ * Once a topic branch forks from "master", "master" is never
+   merged into it again (either directly or indirectly).
+
+ * Once a topic branch is fully cooked and merged into "master",
+   it is deleted.  If you need to build on top of it to correct
+   earlier mistakes, a new topic branch is created by forking at
+   the tip of the "master".  This is not strictly necessary, but
+   it makes it easier to keep your history simple.
+
+ * Whenever you need to test or publish your changes to topic
+   branches, merge them into "next" branch.
+
+The script, being an example, hardcodes the publish branch name
+to be "next", but it is trivial to make it configurable via
+$GIT_DIR/config mechanism.
+
+With this workflow, you would want to know:
+
+(1) ... if a topic branch has ever been merged to "next".  Young
+    topic branches can have stupid mistakes you would rather
+    clean up before publishing, and things that have not been
+    merged into other branches can be easily rebased without
+    affecting other people.  But once it is published, you would
+    not want to rewind it.
+
+(2) ... if a topic branch has been fully merged to "master".
+    Then you can delete it.  More importantly, you should not
+    build on top of it -- other people may already want to
+    change things related to the topic as patches against your
+    "master", so if you need further changes, it is better to
+    fork the topic (perhaps with the same name) afresh from the
+    tip of "master".
+
+Let's look at this example:
+
+		   o---o---o---o---o---o---o---o---o---o "next"
+		  /       /           /           /
+		 /   a---a---b A     /           /
+		/   /               /           /
+	       /   /   c---c---c---c B         /
+	      /   /   /             \         /
+	     /   /   /   b---b C     \       /
+	    /   /   /   /             \     /
+    ---o---o---o---o---o---o---o---o---o---o---o "master"
+
+
+A, B and C are topic branches.
+
+ * A has one fix since it was merged up to "next".
+
+ * B has finished.  It has been fully merged up to "master" and "next",
+   and is ready to be deleted.
+
+ * C has not merged to "next" at all.
+
+We would want to allow C to be rebased, refuse A, and encourage
+B to be deleted.
+
+To compute (1):
+
+	git rev-list ^master ^topic next
+	git rev-list ^master        next
+
+	if these match, topic has not merged in next at all.
+
+To compute (2):
+
+	git rev-list master..topic
+
+	if this is empty, it is fully merged to "master".
+
+DOC_END
diff --git a/test/examples/lotr_migration.git/hooks/pre-receive.sample b/test/examples/lotr_migration.git/hooks/pre-receive.sample
new file mode 100755
index 00000000..a1fd29ec
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/pre-receive.sample
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to make use of push options.
+# The example simply echoes all push options that start with 'echoback='
+# and rejects all pushes when the "reject" push option is used.
+#
+# To enable this hook, rename this file to "pre-receive".
+
+if test -n "$GIT_PUSH_OPTION_COUNT"
+then
+	i=0
+	while test "$i" -lt "$GIT_PUSH_OPTION_COUNT"
+	do
+		eval "value=\$GIT_PUSH_OPTION_$i"
+		case "$value" in
+		echoback=*)
+			echo "echo from the pre-receive-hook: ${value#*=}" >&2
+			;;
+		reject)
+			exit 1
+		esac
+		i=$((i + 1))
+	done
+fi
diff --git a/test/examples/lotr_migration.git/hooks/prepare-commit-msg.sample b/test/examples/lotr_migration.git/hooks/prepare-commit-msg.sample
new file mode 100755
index 00000000..10fa14c5
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/prepare-commit-msg.sample
@@ -0,0 +1,42 @@
+#!/bin/sh
+#
+# An example hook script to prepare the commit log message.
+# Called by "git commit" with the name of the file that has the
+# commit message, followed by the description of the commit
+# message's source.  The hook's purpose is to edit the commit
+# message file.  If the hook fails with a non-zero status,
+# the commit is aborted.
+#
+# To enable this hook, rename this file to "prepare-commit-msg".
+
+# This hook includes three examples. The first one removes the
+# "# Please enter the commit message..." help message.
+#
+# The second includes the output of "git diff --name-status -r"
+# into the message, just before the "git status" output.  It is
+# commented because it doesn't cope with --amend or with squashed
+# commits.
+#
+# The third example adds a Signed-off-by line to the message, that can
+# still be edited.  This is rarely a good idea.
+
+COMMIT_MSG_FILE=$1
+COMMIT_SOURCE=$2
+SHA1=$3
+
+/usr/bin/perl -i.bak -ne 'print unless(m/^. Please enter the commit message/..m/^#$/)' "$COMMIT_MSG_FILE"
+
+# case "$COMMIT_SOURCE,$SHA1" in
+#  ,|template,)
+#    /usr/bin/perl -i.bak -pe '
+#       print "\n" . `git diff --cached --name-status -r`
+# 	 if /^#/ && $first++ == 0' "$COMMIT_MSG_FILE" ;;
+#  *) ;;
+# esac
+
+# SOB=$(git var GIT_COMMITTER_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# git interpret-trailers --in-place --trailer "$SOB" "$COMMIT_MSG_FILE"
+# if test -z "$COMMIT_SOURCE"
+# then
+#   /usr/bin/perl -i.bak -pe 'print "\n" if !$first_line++' "$COMMIT_MSG_FILE"
+# fi
diff --git a/test/examples/lotr_migration.git/hooks/update.sample b/test/examples/lotr_migration.git/hooks/update.sample
new file mode 100755
index 00000000..80ba9413
--- /dev/null
+++ b/test/examples/lotr_migration.git/hooks/update.sample
@@ -0,0 +1,128 @@
+#!/bin/sh
+#
+# An example hook script to block unannotated tags from entering.
+# Called by "git receive-pack" with arguments: refname sha1-old sha1-new
+#
+# To enable this hook, rename this file to "update".
+#
+# Config
+# ------
+# hooks.allowunannotated
+#   This boolean sets whether unannotated tags will be allowed into the
+#   repository.  By default they won't be.
+# hooks.allowdeletetag
+#   This boolean sets whether deleting tags will be allowed in the
+#   repository.  By default they won't be.
+# hooks.allowmodifytag
+#   This boolean sets whether a tag may be modified after creation. By default
+#   it won't be.
+# hooks.allowdeletebranch
+#   This boolean sets whether deleting branches will be allowed in the
+#   repository.  By default they won't be.
+# hooks.denycreatebranch
+#   This boolean sets whether remotely creating branches will be denied
+#   in the repository.  By default this is allowed.
+#
+
+# --- Command line
+refname="$1"
+oldrev="$2"
+newrev="$3"
+
+# --- Safety check
+if [ -z "$GIT_DIR" ]; then
+	echo "Don't run this script from the command line." >&2
+	echo " (if you want, you could supply GIT_DIR then run" >&2
+	echo "  $0 <ref> <oldrev> <newrev>)" >&2
+	exit 1
+fi
+
+if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then
+	echo "usage: $0 <ref> <oldrev> <newrev>" >&2
+	exit 1
+fi
+
+# --- Config
+allowunannotated=$(git config --bool hooks.allowunannotated)
+allowdeletebranch=$(git config --bool hooks.allowdeletebranch)
+denycreatebranch=$(git config --bool hooks.denycreatebranch)
+allowdeletetag=$(git config --bool hooks.allowdeletetag)
+allowmodifytag=$(git config --bool hooks.allowmodifytag)
+
+# check for no description
+projectdesc=$(sed -e '1q' "$GIT_DIR/description")
+case "$projectdesc" in
+"Unnamed repository"* | "")
+	echo "*** Project description file hasn't been set" >&2
+	exit 1
+	;;
+esac
+
+# --- Check types
+# if $newrev is 0000...0000, it's a commit to delete a ref.
+zero="0000000000000000000000000000000000000000"
+if [ "$newrev" = "$zero" ]; then
+	newrev_type=delete
+else
+	newrev_type=$(git cat-file -t $newrev)
+fi
+
+case "$refname","$newrev_type" in
+	refs/tags/*,commit)
+		# un-annotated tag
+		short_refname=${refname##refs/tags/}
+		if [ "$allowunannotated" != "true" ]; then
+			echo "*** The un-annotated tag, $short_refname, is not allowed in this repository" >&2
+			echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate." >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,delete)
+		# delete tag
+		if [ "$allowdeletetag" != "true" ]; then
+			echo "*** Deleting a tag is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,tag)
+		# annotated tag
+		if [ "$allowmodifytag" != "true" ] && git rev-parse $refname > /dev/null 2>&1
+		then
+			echo "*** Tag '$refname' already exists." >&2
+			echo "*** Modifying a tag is not allowed in this repository." >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,commit)
+		# branch
+		if [ "$oldrev" = "$zero" -a "$denycreatebranch" = "true" ]; then
+			echo "*** Creating a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,delete)
+		# delete branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/remotes/*,commit)
+		# tracking branch
+		;;
+	refs/remotes/*,delete)
+		# delete tracking branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a tracking branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	*)
+		# Anything else (is there anything else?)
+		echo "*** Update hook: unknown type of update to ref $refname of type $newrev_type" >&2
+		exit 1
+		;;
+esac
+
+# --- Finished
+exit 0
diff --git a/test/examples/lotr_migration.git/info/exclude b/test/examples/lotr_migration.git/info/exclude
new file mode 100644
index 00000000..a5196d1b
--- /dev/null
+++ b/test/examples/lotr_migration.git/info/exclude
@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
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diff --git a/test/examples/lotr_migration.git/packed-refs b/test/examples/lotr_migration.git/packed-refs
new file mode 100644
index 00000000..1798fbf6
--- /dev/null
+++ b/test/examples/lotr_migration.git/packed-refs
@@ -0,0 +1,2 @@
+# pack-refs with: peeled fully-peeled sorted 
+5074f2db9f443304ab0866edba0f21c9ab50a25c refs/heads/master
diff --git a/test/examples/lotr_migration.git/shallow b/test/examples/lotr_migration.git/shallow
new file mode 100644
index 00000000..8085c4eb
--- /dev/null
+++ b/test/examples/lotr_migration.git/shallow
@@ -0,0 +1 @@
+5074f2db9f443304ab0866edba0f21c9ab50a25c
diff --git a/test/test_migrate.rb b/test/test_migrate.rb
new file mode 100644
index 00000000..eb9300aa
--- /dev/null
+++ b/test/test_migrate.rb
@@ -0,0 +1,52 @@
+# ~*~ encoding: utf-8 ~*~
+require File.expand_path(File.join(File.dirname(__FILE__), 'helper'))
+
+# Original contents of Subdir/Foo.md:
+# waa
+# [[Samwi]]
+# [[samwise gamgee.mediaWiki]]
+# [[Samwise Gamgee.mediawiki]]
+# [[Samwise Gamgee]]
+# [[Test|Samwise Gamgee#Anchor]]
+# [[Waaa|Test]]
+# [[Zaa]]
+
+# Contents of Subdir/Foo.md after successful tag migration
+result = <<EOF
+waa
+[[Samwi]]
+[[/Samwise Gamgee.mediawiki]]
+[[/Samwise Gamgee.mediawiki]]
+[[/Samwise Gamgee.md]]
+[[Test|/Samwise Gamgee.md#Anchor]]
+[[Waaa|/Bar/Test.md]]
+[[Subsub/Zaa.md]]
+EOF
+
+unless ENV['TRAVIS']
+
+  context '4.x -> 5.x tag migrator' do
+    include Rack::Test::Methods
+
+    setup do
+      @path = cloned_testpath("examples/lotr_migration.git")
+    end
+    
+    test 'repair broken links' do
+      PREFER_RELATIVE = true
+      RUN_SILENT = true
+      NO_DRY_RUN = true
+      script_path = File.expand_path(File.join(File.dirname(__FILE__), '../', 'bin', 'gollum-migrate-tags'))
+      Dir.chdir(@path) do
+        load script_path
+      end
+      f = File.new(::File.join(@path, 'Subdir/Foo.md'), 'r')
+      assert_equal result, f.read
+    end
+
+    teardown do
+      FileUtils.rm_rf(@path)
+    end
+  end
+
+end
\ No newline at end of file