Refactor wiki model

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/project_wiki.rb

+class ProjectWiki
+  include Gitlab::ShellAdapter
+
+  MARKUPS = {
+    "Markdown" => :markdown,
+    "RDoc"     => :rdoc
+  }
+
+  class CouldNotCreateWikiError < StandardError; end
+
+  # Returns a string describing what went wrong after
+  # an operation fails.
+  attr_reader :error_message
+
+  def initialize(project, user = nil)
+    @project = project
+    @user = user
+  end
+
+  def path
+    @project.path + '.wiki'
+  end
+
+  def path_with_namespace
+    @project.path_with_namespace + ".wiki"
+  end
+
+  def url_to_repo
+    gitlab_shell.url_to_repo(path_with_namespace)
+  end
+
+  def ssh_url_to_repo
+    url_to_repo
+  end
+
+  def http_url_to_repo
+    [Gitlab.config.gitlab.url, "/", path_with_namespace, ".git"].join('')
+  end
+
+  # Returns the Gollum::Wiki object.
+  def wiki
+    @wiki ||= begin
+      Gollum::Wiki.new(path_to_repo)
+    rescue Gollum::NoSuchPathError
+      create_repo!
+    end
+  end
+
+  def empty?
+    pages.empty?
+  end
+
+  # Returns an Array of Gitlab WikiPage instances or an
+  # empty Array if this Wiki has no pages.
+  def pages
+    wiki.pages.map { |page| WikiPage.new(self, page, true) }
+  end
+
+  # Finds a page within the repository based on a tile
+  # or slug.
+  #
+  # title - The human readable or parameterized title of
+  #         the page.
+  #
+  # Returns an initialized WikiPage instance or nil
+  def find_page(title, version = nil)
+    if page = wiki.page(title, version)
+      WikiPage.new(self, page, true)
+    else
+      nil
+    end
+  end
+
+  def create_page(title, content, format = :markdown, message = nil)
+    commit = commit_details(:created, message, title)
+
+    wiki.write_page(title, format, content, commit)
+  rescue Gollum::DuplicatePageError => e
+    @error_message = "Duplicate page: #{e.message}"
+    return false
+  end
+
+  def update_page(page, content, format = :markdown, message = nil)
+    commit = commit_details(:updated, message, page.title)
+
+    wiki.update_page(page, page.name, format, content, commit)
+  end
+
+  def delete_page(page, message = nil)
+    wiki.delete_page(page, commit_details(:deleted, message, page.title))
+  end
+
+  private
+
+  def create_repo!
+    if init_repo(path_with_namespace)
+      Gollum::Wiki.new(path_to_repo)
+    else
+      raise CouldNotCreateWikiError
+    end
+  end
+
+  def init_repo(path_with_namespace)
+    gitlab_shell.add_repository(path_with_namespace)
+  end
+
+  def commit_details(action, message = nil, title = nil)
+    commit_message = message || default_message(action, title)
+
+    {email: @user.email, name: @user.name, message: commit_message}
+  end
+
+  def default_message(action, title)
+    "#{@user.username} #{action} page: #{title}"
+  end
+
+  def path_to_repo
+    @path_to_repo ||= File.join(Gitlab.config.gitlab_shell.repos_path, "#{path_with_namespace}.git")
+  end
+end

app/models/wiki_page.rb

@@ -19,7 +19,7 @@ class WikiPage
   validates :title, presence: true
   validates :content, presence: true
 
-  # The Gitlab GollumWiki instance.
+  # The Gitlab ProjectWiki instance.
   attr_reader :wiki
 
   # The raw Gollum::Page instance.
@@ -118,7 +118,7 @@ class WikiPage
   #       :content - The raw markup content.
   #       :format  - Optional symbol representing the
   #                  content format. Can be any type
-  #                  listed in the GollumWiki::MARKUPS
+  #                  listed in the ProjectWiki::MARKUPS
   #                  Hash.
   #       :message - Optional commit message to set on
   #                  the new page.
@@ -135,7 +135,7 @@ class WikiPage
   #
   # new_content - The raw markup content to replace the existing.
   # format      - Optional symbol representing the content format.
-  #               See GollumWiki::MARKUPS Hash for available formats.
+  #               See ProjectWiki::MARKUPS Hash for available formats.
   # message     - Optional commit message to set on the new version.
   #
   # Returns the String SHA1 of the newly created page
@@ -181,5 +181,4 @@ class WikiPage
     end
     @persisted
   end
-
 end