History Pages

From Jason Blevins:
  Create a "History" page for each wiki page.
  Link to it, and to the "Diff" page from "Recently Revised".
Also, correct a bug in listing/deleting links to uploaded
video and audio files.

app/controllers/wiki_controller.rb

@@ -314,6 +314,27 @@ class WikiController < ApplicationController
     end
   end
 
+  def history
+    if @page
+      @revisions_by_day = Hash.new { |h, day| h[day] = [] }
+      @revision_numbers = Hash.new { |h, id| h[id] = [] }
+      revision_number = @page.revisions.length
+      @page.revisions.reverse.each do |rev|
+        day = Date.new(rev.revised_at.year, rev.revised_at.month, rev.revised_at.day)
+        @revisions_by_day[day] << rev
+        @revision_numbers[rev.id] = revision_number
+        revision_number = revision_number - 1
+      end
+      render :action => 'history'
+    else
+      if not @page_name.nil? and @page_name.is_utf8? and not @page_name.empty?
+        redirect_to :web => @web_name, :action => 'new', :id => @page_name
+      else
+        render :text => 'Page name is not specified', :status => 404, :layout => 'error'
+      end
+    end
+  end
+
   def tex
     if @web.markup == :markdownMML or @web.markup == :markdownPNG or @web.markup == :markdown
       @tex_content = Maruku.new(@page.content).to_latex

app/helpers/application_helper.rb

@@ -52,6 +52,22 @@ module ApplicationHelper
     UrlGenerator.new(@controller).make_link(page.author.name, page.web, nil, options)
   end
 
+  # Create a hyperlink to a particular revision of a Wiki page
+  def link_to_revision(page, revision_number, text = nil, mode = nil, html_options = {})
+    link_to(
+        text || page.plain_name + "(rev # #{revision_number})",
+            {:web => @web.address, :action => 'revision', :id => page.name,
+              :rev => revision_number, :mode => mode}, html_options)
+  end
+
+  # Create a hyperlink to the history of a particular Wiki page
+  def link_to_history(page, text = nil, html_options = {})
+    link_to(
+        text || page.plain_name + "(history)",
+            {:web => @web.address, :action => 'history', :id => page.name},
+            html_options)
+  end
+
   def base_url
     home_page_url = url_for :controller => 'admin', :action => 'create_system', :only_path => true
     home_page_url.sub(%r-/create_system/?$-, '')

app/helpers/wiki_helper.rb

@@ -6,6 +6,7 @@ module WikiHelper
     menu << back_for_revision if @revision_number > 1
     menu << current_revision
     menu << see_or_hide_changes_for_revision if @revision_number > 1
+    menu << history if @page.revisions.length > 1
     menu << rollback
     menu
   end
@@ -18,6 +19,7 @@ module WikiHelper
       menu << back_for_page
       menu << see_or_hide_changes_for_page
     end
+    menu << history if @page.revisions.length > 1
     menu
   end
 
@@ -32,6 +34,11 @@ module WikiHelper
         {:class => 'navlink', :accesskey => 'W', :id => 'edit_web', :rel => 'nofollow'})
   end
 
+  def history
+    link_to_history(@page, 'History',
+        {:class => 'navlink', :accesskey => 'S', :id => 'history', :rel => 'nofollow'})
+  end
+            
   def forward
     if @revision_number < @page.revisions.length - 1
       link_to('Forward in time', 

app/views/wiki/history.html.erb

@@ -0,0 +1,23 @@
+<%- @title = @page.plain_name + " (history)" -%>
+<%- @show_footer = true -%>
+
+<%- @revisions_by_day.keys.sort.reverse.each do |day| -%>
+  <h3><%= format_date(day, include_time = false) %></h3>
+  <ul>
+  <%- for rev in @revisions_by_day[day] -%>
+    <li>
+      <%= link_to_revision(rev.page, @revision_numbers[rev.id],
+          text="Revision #{@revision_numbers[rev.id]}") %>
+      <%- if @revision_numbers[rev.id] > 1 -%>
+          (<%= link_to_revision(rev.page, @revision_numbers[rev.id],
+              text="diff", mode='diff') %>)
+      <%- end -%>
+      <div class="byline" style="margin-bottom: 0px">
+        by <%= link_to_page(rev.author) %>
+        at <%= format_date(rev.revised_at) %>
+        <%= "from #{rev.author.ip}" if rev.author.respond_to?(:ip) %>
+      </div>
+    </li>
+  <%- end -%>
+  </ul>
+<%- end -%>

app/views/wiki/recently_revised.rhtml

@@ -8,6 +8,11 @@
   <%- for page in @pages_by_day[day] -%>
     <li>
       <%= link_to_existing_page page %>
+      <%- if page.revisions.length > 1 %>
+          (<%= link_to_revision(page, page.revisions.length, text='diff',
+               mode='diff') %>)
+          (<%= link_to_history(page, text='history') %>)
+      <%- end -%>
       <div class="byline" style="margin-bottom: 0px">
         by <%= link_to_page(page.author) %>
         at <%= format_date(page.revised_at) %>

lib/page_renderer.rb

@@ -102,7 +102,7 @@ class PageRenderer
     the_wiki_words = wiki_links(rendering_result)
     # Exclude backslash-escaped wiki words, such as \WikiWord, as well as links to files 
     # and pictures, such as [[foo.txt:file]] or [[foo.jpg:pic]]
-    the_wiki_words.delete_if { |link| link.escaped? or [:pic, :file, :delete].include?(link.link_type) }
+    the_wiki_words.delete_if { |link| link.escaped? or [:pic, :file, :audio, :video, :delete].include?(link.link_type) }
     # convert to the list of unique page names
     the_wiki_words.map { |link| ( link.page_name ) }.uniq
   end
@@ -114,7 +114,7 @@ class PageRenderer
     
   def find_wiki_files(rendering_result)
      the_wiki_files = wiki_links(rendering_result)
-     the_wiki_files.delete_if { |link| ![:pic, :file].include?(link.link_type) }
+     the_wiki_files.delete_if { |link| ![:pic, :file, :audio, :video].include?(link.link_type) }
      the_wiki_files.map { |link| ( link.page_name ) }.uniq
   end