Added wiki annotate view. It's accessible for each version from the page history view.

Slight style change: pre-wrap added on file/diff contents.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1020 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/wiki_content.rb

@@ -60,6 +60,14 @@ class WikiContent < ActiveRecord::Base
         data
       end      
     end
+    
+    # Returns the previous version or nil
+    def previous
+      @previous ||= WikiContent::Version.find(:first, 
+                                              :order => 'version DESC',
+                                              :include => :author,
+                                              :conditions => ["wiki_content_id = ? AND version < ?", wiki_content_id, version])
+    end
   end
   
 end

app/models/wiki_page.rb

@@ -16,6 +16,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require 'diff'
+require 'enumerator'
 
 class WikiPage < ActiveRecord::Base
   belongs_to :wiki
@@ -87,6 +88,12 @@ class WikiPage < ActiveRecord::Base
     (content_to && content_from) ? WikiDiff.new(content_to, content_from) : nil
   end
   
+  def annotate(version=nil)
+    version = version ? version.to_i : self.content.version
+    c = content.versions.find_by_version(version)
+    c ? WikiAnnotate.new(c) : nil
+  end
+  
   def self.pretty_title(str)
     (str && str.is_a?(String)) ? str.tr('_', ' ') : str
   end
@@ -113,3 +120,41 @@ class WikiDiff
     @diff = words_from.diff @words
   end
 end
+
+class WikiAnnotate
+  attr_reader :lines, :content
+  
+  def initialize(content)
+    @content = content
+    current = content
+    current_lines = current.text.split(/\r?\n/)
+    @lines = current_lines.collect {|t| [nil, nil, t]}
+    positions = []
+    current_lines.size.times {|i| positions << i}
+    while (current.previous)
+      d = current.previous.text.split(/\r?\n/).diff(current.text.split(/\r?\n/)).diffs.flatten
+      d.each_slice(3) do |s|
+        sign, line = s[0], s[1]
+        if sign == '+' && positions[line] && positions[line] != -1
+          if @lines[positions[line]][0].nil?
+            @lines[positions[line]][0] = current.version
+            @lines[positions[line]][1] = current.author
+          end
+        end
+      end
+      d.each_slice(3) do |s|
+        sign, line = s[0], s[1]
+        if sign == '-'
+          positions.insert(line, -1)
+        else
+          positions[line] = nil
+        end
+      end
+      positions.compact!
+      # Stop if every line is annotated
+      break unless @lines.detect { |line| line[0].nil? }
+      current = current.previous
+    end
+    @lines.each { |line| line[0] ||= current.version }
+  end
+end