From 889e15eabbe107d2642fdd8aa3f03821058c00dc Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Mon, 6 Jul 2026 13:52:28 +0200
Subject: Fix shared preview links breaking after a second publish

A token's page could stop being node.head_id (superseded by a newer
draft) while still being published_at.present? - the old check only
compared against the current head, so a superseded page fell through
to direct rendering instead of redirecting, serving a stale frozen
snapshot indefinitely instead of the current live content.

Also handles scheduled publishing correctly: a page can be head_id but
not yet public? (published_at in the future) - that case must still
render directly, not redirect into a 404 on the not-yet-live public
URL.
---
 test/models/page_test.rb | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'test/models/page_test.rb')

diff --git a/test/models/page_test.rb b/test/models/page_test.rb
index afba8b5..ad2742f 100644
--- a/test/models/page_test.rb
+++ b/test/models/page_test.rb
@@ -142,5 +142,38 @@ class PageTest < ActiveSupport::TestCase
     update        = updates2009.children.create!( :slug => "my-first-update" )
     assert_equal "update", update.draft.template_name
   end
-  
+
+  test "a page scheduled for future publication is not yet public even after being published" do
+    node = Node.root.children.create!(slug: "preview-scheduled-test")
+    draft = node.find_or_create_draft(@user1)
+    draft.title = "Scheduled test"
+    draft.published_at = 1.day.from_now
+    draft.save!
+    token = draft.ensure_preview_token!
+
+    node.publish_draft!
+    page = Page.find_by(preview_token: token)
+
+    assert_equal page.id, page.node.head_id
+    assert_not page.public?
+  end
+
+  test "a superseded page is no longer the head, even though it was once published" do
+    node = Node.root.children.create!(slug: "preview-superseded-test")
+    first_draft = node.find_or_create_draft(@user1)
+    first_draft.title = "First version"
+    first_draft.save!
+    first_token = first_draft.ensure_preview_token!
+    node.publish_draft!
+
+    second_draft = node.find_or_create_draft(@user1)
+    second_draft.title = "Second version"
+    second_draft.save!
+    node.publish_draft!
+
+    first_page = Page.find_by(preview_token: first_token)
+
+    assert_not_equal first_page.id, first_page.node.head_id
+    assert first_page.published_at.present?
+  end
 end
-- 
cgit v1.3


From a25d90335ad3738b6831288190132c2f7498465c Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Fri, 10 Jul 2026 00:35:24 +0200
Subject: Retire vendored cacycle_diff.js for a diff-lcs-based diff view

Revisions#diff now computes an inline or side-by-side word diff
server-side (Page#diff_against, lib/html_word_diff.rb) instead of
shipping raw/escaped content to the browser for a 2008-era vendored
JS differ to mangle. View mode is picked via a `view` param, settable
either on the diff page itself or directly from the revisions#index
sticky bar next to "Diff revisions".

Also fixes a pre-existing bug in RevisionsController#diff's single-
revision branch, which set params[:start]/params[:end] instead of
params[:start_revision]/params[:end_revision].
---
 Gemfile                                       |    3 +-
 Gemfile.lock                                  |    3 +
 app/controllers/revisions_controller.rb       |   12 +-
 app/models/page.rb                            |   16 +
 app/views/revisions/diff.html.erb             |   78 +-
 app/views/revisions/index.html.erb            |    8 +
 lib/html_word_diff.rb                         |   52 ++
 public/javascripts/cacycle_diff.js            | 1112 -------------------------
 public/stylesheets/admin.css                  |   25 +
 test/controllers/revisions_controller_test.rb |   29 +
 test/models/page_test.rb                      |   34 +
 11 files changed, 204 insertions(+), 1168 deletions(-)
 create mode 100644 lib/html_word_diff.rb
 delete mode 100644 public/javascripts/cacycle_diff.js

(limited to 'test/models/page_test.rb')

diff --git a/Gemfile b/Gemfile
index d136eb5..19d92d7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,10 +45,11 @@ gem 'acts-as-taggable-on',
     git:    'https://github.com/mbleigh/acts-as-taggable-on.git',
     branch: 'master'
 
-# ── XML / parsing ─────────────────────────────────────────────────────────────
+# ── XML / parsing / diffing ───────────────────────────────────────────────────
 
 gem 'libxml-ruby', '~> 5.0', require: 'xml'  # body link rewriting in Page model
 gem 'nokogiri',    '~> 1.18'
+gem 'diff-lcs', require: 'diff/lcs'
 
 # ── Operational ───────────────────────────────────────────────────────────────
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 02c71ff..e6f5fa0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -108,6 +108,7 @@ GEM
     connection_pool (3.0.2)
     crass (1.0.7)
     date (3.5.1)
+    diff-lcs (2.0.0)
     drb (2.2.3)
     erb (6.0.4)
     erubi (1.13.1)
@@ -330,6 +331,7 @@ DEPENDENCIES
   chaos_calendar!
   coffee-rails (~> 4.0)
   concurrent-ruby (~> 1.3)
+  diff-lcs
   exception_notification (~> 4.5)
   globalize (~> 7.0)
   jquery-rails
@@ -377,6 +379,7 @@ CHECKSUMS
   connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
   crass (1.0.7) sha256=94868719948664c89ddcaf0a37c65048413dfcb1c869470a5f7a7ceb5390b295
   date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
+  diff-lcs (2.0.0) sha256=708a5d52ec2945b50f8f53a181174aa1ef2c496edf81c05957fe956dabb363d5
   drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
   erb (6.0.4) sha256=38e3803694be357fe2bfe312487c74beaf9fb4e5beb3e22498952fe1645b95d9
   erubi (1.13.1) sha256=a082103b0885dbc5ecf1172fede897f9ebdb745a4b97a5e8dc63953db1ee4ad9
diff --git a/app/controllers/revisions_controller.rb b/app/controllers/revisions_controller.rb
index 42d667e..9acb26f 100644
--- a/app/controllers/revisions_controller.rb
+++ b/app/controllers/revisions_controller.rb
@@ -13,16 +13,18 @@ class RevisionsController < ApplicationController
 
   def diff
     @node = Node.find(params[:node_id])
-    
+
     if @node.pages.length > 1
       params[:start_revision]  ||= @node.pages.all[-2].revision
       params[:end_revision]    ||= @node.pages.all[-1].revision
     else
-      params[:start], params[:end] = 1, 1
+      params[:start_revision], params[:end_revision] = 1, 1
     end
-    
-    @start  = @node.pages.find_by_revision( params[:start_revision] )
-    @end    = @node.pages.find_by_revision( params[:end_revision] )
+
+    @start      = @node.pages.find_by_revision( params[:start_revision] )
+    @end        = @node.pages.find_by_revision( params[:end_revision] )
+    @diff_view  = params[:view] == "side_by_side" ? :side_by_side : :inline
+    @diff       = @end.diff_against( @start, view: @diff_view )
   end
 
   def show
diff --git a/app/models/page.rb b/app/models/page.rb
index 1a98e08..ea04cd6 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -175,6 +175,22 @@ class Page < ApplicationRecord
     self.save
   end
 
+  def diff_against other, view: :inline
+    if view == :side_by_side
+      {
+        title:    HtmlWordDiff.side_by_side(other.title.to_s,    title.to_s),
+        abstract: HtmlWordDiff.side_by_side(other.abstract.to_s, abstract.to_s),
+        body:     HtmlWordDiff.side_by_side(other.body.to_s,     body.to_s)
+      }
+    else
+      {
+        title:    HtmlWordDiff.inline(other.title.to_s,    title.to_s),
+        abstract: HtmlWordDiff.inline(other.abstract.to_s, abstract.to_s),
+        body:     HtmlWordDiff.inline(other.body.to_s,     body.to_s)
+      }
+    end
+  end
+
   def public?
     published_at.nil? ? true : published_at < Time.now
   end
diff --git a/app/views/revisions/diff.html.erb b/app/views/revisions/diff.html.erb
index d8c6a47..d7bb528 100644
--- a/app/views/revisions/diff.html.erb
+++ b/app/views/revisions/diff.html.erb
@@ -7,58 +7,36 @@
 <%= form_tag diff_node_revisions_path do %>
   <%= select_tag :start_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:start_revision].to_i) %>
   <%= select_tag :end_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:end_revision].to_i) %>
+  <%= select_tag :view, options_for_select([['Inline', 'inline'], ['Side by side', 'side_by_side']], @diff_view) %>
   <%= submit_tag 'Diff' %>
 <% end %>
 
-<div id="start_title" style="display: none;">
-  <%= h(@start.title) %>
-</div>
-
-<div id="end_title" style="display: none;">
-  <%= h(@end.title) %>
-</div>
-
-<div id="start_abstract" style="display: none;">
-  <%= h(@start.abstract) %>
-</div>
-
-<div id="end_abstract" style="display: none;">
-  <%= h(@end.abstract) %>
-</div>
-
-<pre>
-  <div id="start_body" style="display: none;">
-    <%= (@start.body) %>
-  </div>
-</pre>
-<pre>
-  <div id="end_body" style="display: none;">
-    <%= (@end.body) %>
-  </div>
-</pre>
-
-<script src="/javascripts/cacycle_diff.js"></script>
-<script type="text/javascript" charset="utf-8">
-  window.onload = function() {
-    title1    = document.getElementById('start_title').innerHTML;
-    title2    = document.getElementById('end_title').innerHTML;
-    abstract1 = document.getElementById('start_abstract').innerHTML;
-    abstract2 = document.getElementById('end_abstract').innerHTML;
-    body1     = document.getElementById('start_body').innerHTML;
-    body2     = document.getElementById('end_body').innerHTML;
-    document.getElementById('diffview_title').innerHTML = WDiffString(title1, title2);
-    document.getElementById('diffview_abstract').innerHTML = WDiffString(abstract1, abstract2);
-    document.getElementById('diffview_body').innerHTML = WDiffString(body1, body2);
-  }
-</script>
-
 <div id="diffview">
-  <h3>Title</h3>
-  <p id="diffview_title"></p>
-  
-  <h3>Abstract</h3>
-  <p id="diffview_abstract"></p>
-  
-  <h3>Body</h3>
-  <p id="diffview_body"></p>
+  <% if @diff_view == :side_by_side %>
+    <div class="diff_side_by_side">
+      <div class="diff_column">
+        <h3>Title</h3>
+        <p><%= raw @diff[:title][0] %></p>
+        <h3>Abstract</h3>
+        <p><%= raw @diff[:abstract][0] %></p>
+        <h3>Body</h3>
+        <%= raw @diff[:body][0] %>
+      </div>
+      <div class="diff_column">
+        <h3>Title</h3>
+        <p><%= raw @diff[:title][1] %></p>
+        <h3>Abstract</h3>
+        <p><%= raw @diff[:abstract][1] %></p>
+        <h3>Body</h3>
+        <%= raw @diff[:body][1] %>
+      </div>
+    </div>
+  <% else %>
+    <h3>Title</h3>
+    <p><%= raw @diff[:title] %></p>
+    <h3>Abstract</h3>
+    <p><%= raw @diff[:abstract] %></p>
+    <h3>Body</h3>
+    <%= raw @diff[:body] %>
+  <% end %>
 </div>
diff --git a/app/views/revisions/index.html.erb b/app/views/revisions/index.html.erb
index a6a981a..58c08b7 100644
--- a/app/views/revisions/index.html.erb
+++ b/app/views/revisions/index.html.erb
@@ -19,6 +19,8 @@
               form: { id: 'diff_form', class: 'button_to computation' },
               disabled: true %>
         <span id="diff_selection_label"></span>
+        <label><%= radio_button_tag :view, 'inline', true %> Inline</label>
+        <label><%= radio_button_tag :view, 'side_by_side', false %> Side by side</label>
       </td>
     </tr>
   </thead>
@@ -68,6 +70,7 @@
   document.getElementById('diff_form').addEventListener('submit', function(e) {
     var start = document.querySelector('input[name="start_revision"]:checked');
     var end = document.querySelector('input[name="end_revision"]:checked');
+    var view = document.querySelector('input[name="view"]:checked');
     if (start) {
       var s = document.createElement('input');
       s.type = 'hidden'; s.name = 'start_revision'; s.value = start.value;
@@ -78,5 +81,10 @@
       en.type = 'hidden'; en.name = 'end_revision'; en.value = end.value;
       this.appendChild(en);
     }
+    if (view) {
+      var v = document.createElement('input');
+      v.type = 'hidden'; v.name = 'view'; v.value = view.value;
+      this.appendChild(v);
+    }
   });
 </script>
diff --git a/lib/html_word_diff.rb b/lib/html_word_diff.rb
new file mode 100644
index 0000000..1f28cf5
--- /dev/null
+++ b/lib/html_word_diff.rb
@@ -0,0 +1,52 @@
+require 'diff/lcs'
+
+module HtmlWordDiff
+  TOKEN_REGEXP = /<[^>]*>|[[:space:]]+|[[:alnum:]]+|[^[:space:][:alnum:]<>]/
+
+  def self.inline(old_html, new_html)
+    html = +''
+    each_change(old_html, new_html) do |action, old_token, new_token|
+      case action
+      when '='
+        html << new_token
+      when '-'
+        html << "<del>#{old_token}</del>"
+      when '+'
+        html << "<ins>#{new_token}</ins>"
+      when '!'
+        html << "<del>#{old_token}</del><ins>#{new_token}</ins>"
+      end
+    end
+    html
+  end
+
+  def self.side_by_side(old_html, new_html)
+    old_out = +''
+    new_out = +''
+    each_change(old_html, new_html) do |action, old_token, new_token|
+      case action
+      when '='
+        old_out << old_token
+        new_out << new_token
+      when '-'
+        old_out << "<del>#{old_token}</del>"
+      when '+'
+        new_out << "<ins>#{new_token}</ins>"
+      when '!'
+        old_out << "<del>#{old_token}</del>"
+        new_out << "<ins>#{new_token}</ins>"
+      end
+    end
+    [old_out, new_out]
+  end
+
+  def self.each_change(old_html, new_html)
+    Diff::LCS.sdiff(tokenize(old_html), tokenize(new_html)).each do |change|
+      yield change.action, change.old_element, change.new_element
+    end
+  end
+
+  def self.tokenize(html)
+    html.to_s.scan(TOKEN_REGEXP)
+  end
+end
diff --git a/public/javascripts/cacycle_diff.js b/public/javascripts/cacycle_diff.js
deleted file mode 100644
index 24f9d0b..0000000
--- a/public/javascripts/cacycle_diff.js
+++ /dev/null
@@ -1,1112 +0,0 @@
-// <pre><nowiki>
- 
-/*
- 
-Name:    diff.js
-Version: 0.9.5a (April 6, 2008)
-Info:    http://en.wikipedia.org/wiki/User:Cacycle/diff
-Code:    http://en.wikipedia.org/wiki/User:Cacycle/diff.js
- 
-JavaScript diff algorithm by [[en:User:Cacycle]] (http://en.wikipedia.org/wiki/User_talk:Cacycle).
-Outputs html/css-formatted new text with highlighted deletions, inserts, and block moves.
- 
-The program uses cross-browser code and should work with all modern browsers. It has been tested with:
-* Mozilla Firefox 1.5.0.1
-* Mozilla SeaMonkey 1.0
-* Opera 8.53
-* Internet Explorer 6.0.2900.2180
-* Internet Explorer 7.0.5730.11
-This program is also compatibel with Greasemonkey
- 
-An implementation of the word-based algorithm from:
- 
-Communications of the ACM 21(4):264 (1978)
-http://doi.acm.org/10.1145/359460.359467
- 
-With the following additional feature:
- 
-* Word types have been optimized for MediaWiki source texts
-* Additional post-pass 5 code for resolving islands caused by adding
-  two common words at the end of sequences of common words
-* Additional detection of block borders and color coding of moved blocks and their original position
-* Optional "intelligent" omission of unchanged parts from the output
- 
-This code is used by the MediaWiki in-browser text editors [[en:User:Cacycle/editor]] and [[en:User:Cacycle/wikEd]]
-and the enhanced diff view tool wikEdDiff [[en:User:Cacycle/wikEd]].
- 
-Usage: var htmlText = WDiffString(oldText, newText);
- 
-This code has been released into the public domain.
- 
-Datastructures:
- 
-text: an object that holds all text related datastructures
-  .newWords: consecutive words of the new text (N)
-  .oldWords: consecutive words of the old text (O)
-  .newToOld: array of corresponding word number in old text (NA)
-  .oldToNew: array of corresponding word number in new text (OA)
-  .message:  output message for testing purposes
- 
-symbol['word']: symbol table for passes 1 - 3, holds words as a hash
-  .newCtr:  new word occurences counter (NC)
-  .oldCtr:  old word occurences counter (OC)
-  .toNew:   table last old word number
-  .toOld:   last new word number (OLNA)
- 
-block: an object that holds block move information
-  blocks indexed after new text:
-  .newStart:  new text word number of start of this block
-  .newLength: element number of this block including non-words
-  .newWords:  true word number of this block
-  .newNumber: corresponding block index in old text
-  .newBlock:  moved-block-number of a block that has been moved here
-  .newLeft:   moved-block-number of a block that has been moved from this border leftwards
-  .newRight:  moved-block-number of a block that has been moved from this border rightwards
-  .newLeftIndex:  index number of a block that has been moved from this border leftwards
-  .newRightIndex: index number of a block that has been moved from this border rightwards
-  blocks indexed after old text:
-  .oldStart:  word number of start of this block
-  .oldToNew:  corresponding new text word number of start
-  .oldLength: element number of this block including non-words
-  .oldWords:  true word number of this block
- 
-*/
- 
- 
-// css for change indicators
-if (typeof(wDiffStyleDelete) == 'undefined') { window.wDiffStyleDelete = 'font-weight: normal; text-decoration: none; color: #fff; background-color: #990033;'; }
-if (typeof(wDiffStyleInsert) == 'undefined') { window.wDiffStyleInsert = 'font-weight: normal; text-decoration: none; color: #fff; background-color: #009933;'; }
-if (typeof(wDiffStyleMoved)  == 'undefined') { window.wDiffStyleMoved  = 'font-weight: bold;  color: #000; vertical-align: text-bottom; font-size: xx-small; padding: 0; border: solid 1px;'; }
-if (typeof(wDiffStyleBlock)  == 'undefined') { window.wDiffStyleBlock  = [
-  'color: #000; background-color: #ffff80;',
-  'color: #000; background-color: #c0ffff;',
-  'color: #000; background-color: #ffd0f0;',
-  'color: #000; background-color: #ffe080;',
-  'color: #000; background-color: #aaddff;',
-  'color: #000; background-color: #ddaaff;',
-  'color: #000; background-color: #ffbbbb;',
-  'color: #000; background-color: #d8ffa0;',
-  'color: #000; background-color: #d0d0d0;'
-]; }
- 
-// html for change indicators, {number} is replaced by the block number
-// {block} is replaced by the block style, class and html comments are important for shortening the output
-if (typeof(wDiffHtmlMovedRight)  == 'undefined') { window.wDiffHtmlMovedRight  = '<input class="wDiffHtmlMovedRight" type="button" value="&gt;" style="' + wDiffStyleMoved + ' {block}"><!--wDiffHtmlMovedRight-->'; }
-if (typeof(wDiffHtmlMovedLeft)   == 'undefined') { window.wDiffHtmlMovedLeft   = '<input class="wDiffHtmlMovedLeft" type="button" value="&lt;" style="' + wDiffStyleMoved + ' {block}"><!--wDiffHtmlMovedLeft-->'; }
- 
-if (typeof(wDiffHtmlBlockStart)  == 'undefined') { window.wDiffHtmlBlockStart  = '<span class="wDiffHtmlBlock" style="{block}">'; }
-if (typeof(wDiffHtmlBlockEnd)    == 'undefined') { window.wDiffHtmlBlockEnd    = '</span><!--wDiffHtmlBlock-->'; }
- 
-if (typeof(wDiffHtmlDeleteStart) == 'undefined') { window.wDiffHtmlDeleteStart = '<span class="wDiffHtmlDelete" style="' + wDiffStyleDelete + '">'; }
-if (typeof(wDiffHtmlDeleteEnd)   == 'undefined') { window.wDiffHtmlDeleteEnd   = '</span><!--wDiffHtmlDelete-->'; }
- 
-if (typeof(wDiffHtmlInsertStart) == 'undefined') { window.wDiffHtmlInsertStart = '<span class="wDiffHtmlInsert" style="' + wDiffStyleInsert + '">'; }
-if (typeof(wDiffHtmlInsertEnd)   == 'undefined') { window.wDiffHtmlInsertEnd   = '</span><!--wDiffHtmlInsert-->'; }
- 
-// minimal number of real words for a moved block (0 for always displaying block move indicators)
-if (typeof(wDiffBlockMinLength) == 'undefined') { window.wDiffBlockMinLength = 3; }
- 
-// exclude identical sequence starts and endings from change marking
-if (typeof(wDiffWordDiff) == 'undefined') { window.wDiffWordDiff = true; }
- 
-// enable recursive diff to resolve problematic sequences
-if (typeof(wDiffRecursiveDiff) == 'undefined') { window.wDiffRecursiveDiff = true; }
- 
-// enable block move display
-if (typeof(wDiffShowBlockMoves) == 'undefined') { window.wDiffShowBlockMoves = true; }
- 
-// remove unchanged parts from final output
- 
-// characters before diff tag to search for previous heading, paragraph, line break, cut characters
-if (typeof(wDiffHeadingBefore)   == 'undefined') { window.wDiffHeadingBefore   = 1500; }
-if (typeof(wDiffParagraphBefore) == 'undefined') { window.wDiffParagraphBefore = 1500; }
-if (typeof(wDiffLineBeforeMax)   == 'undefined') { window.wDiffLineBeforeMax   = 1000; }
-if (typeof(wDiffLineBeforeMin)   == 'undefined') { window.wDiffLineBeforeMin   =  500; }
-if (typeof(wDiffBlankBeforeMax)  == 'undefined') { window.wDiffBlankBeforeMax  = 1000; }
-if (typeof(wDiffBlankBeforeMin)  == 'undefined') { window.wDiffBlankBeforeMin  =  500; }
-if (typeof(wDiffCharsBefore)     == 'undefined') { window.wDiffCharsBefore     =  500; }
- 
-// characters after diff tag to search for next heading, paragraph, line break, or characters
-if (typeof(wDiffHeadingAfter)   == 'undefined') { window.wDiffHeadingAfter   = 1500; }
-if (typeof(wDiffParagraphAfter) == 'undefined') { window.wDiffParagraphAfter = 1500; }
-if (typeof(wDiffLineAfterMax)   == 'undefined') { window.wDiffLineAfterMax   = 1000; }
-if (typeof(wDiffLineAfterMin)   == 'undefined') { window.wDiffLineAfterMin   =  500; }
-if (typeof(wDiffBlankAfterMax)  == 'undefined') { window.wDiffBlankAfterMax  = 1000; }
-if (typeof(wDiffBlankAfterMin)  == 'undefined') { window.wDiffBlankAfterMin  =  500; }
-if (typeof(wDiffCharsAfter)     == 'undefined') { window.wDiffCharsAfter     =  500; }
- 
-// maximal fragment distance to join close fragments
-if (typeof(wDiffFragmentJoin)  == 'undefined') { window.wDiffFragmentJoin = 1000; }
-if (typeof(wDiffOmittedChars)  == 'undefined') { window.wDiffOmittedChars = '…'; }
-if (typeof(wDiffOmittedLines)  == 'undefined') { window.wDiffOmittedLines = '<hr style="height: 2px; margin: 1em 10%;">'; }
-if (typeof(wDiffNoChange)      == 'undefined') { window.wDiffNoChange     = '<hr style="height: 2px; margin: 1em 20%;">'; }
- 
-// compatibility fix for old name of main function
-window.StringDiff = window.WDiffString;
- 
- 
-// WDiffString: main program
-// input: oldText, newText, strings containing the texts
-// returns: html diff
- 
-window.WDiffString = function(oldText, newText) {
- 
-// IE / Mac fix
-  oldText = oldText.replace(/(\r\n)/g, '\n');
-  newText = newText.replace(/(\r\n)/g, '\n');
- 
-  var text = {};
-  text.newWords = [];
-  text.oldWords = [];
-  text.newToOld = [];
-  text.oldToNew = [];
-  text.message = '';
-  var block = {};
-  var outText = '';
- 
-// trap trivial changes: no change
-  if (oldText == newText) {
-    outText = newText;
-    outText = WDiffEscape(outText);
-    outText = WDiffHtmlFormat(outText);
-    return(outText);
-  }
- 
-// trap trivial changes: old text deleted
-  if ( (oldText == null) || (oldText.length == 0) ) {
-    outText = newText;
-    outText = WDiffEscape(outText);
-    outText = WDiffHtmlFormat(outText);
-    outText = wDiffHtmlInsertStart + outText + wDiffHtmlInsertEnd;
-    return(outText);
-  }
- 
-// trap trivial changes: new text deleted
-  if ( (newText == null) || (newText.length == 0) ) {
-    outText = oldText;
-    outText = WDiffEscape(outText);
-    outText = WDiffHtmlFormat(outText);
-    outText = wDiffHtmlDeleteStart + outText + wDiffHtmlDeleteEnd;
-    return(outText);
-  }
- 
-// split new and old text into words
-  WDiffSplitText(oldText, newText, text);
- 
-// calculate diff information
-  WDiffText(text);
- 
-//detect block borders and moved blocks
-  WDiffDetectBlocks(text, block);
- 
-// process diff data into formatted html text
-  outText = WDiffToHtml(text, block);
- 
-// IE fix
-  outText = outText.replace(/> ( *)</g, '>&nbsp;$1<');
- 
-  return(outText);
-}
- 
- 
-// WDiffSplitText: split new and old text into words
-// input: oldText, newText, strings containing the texts
-// changes: text.newWords and text.oldWords, arrays containing the texts in arrays of words
- 
-window.WDiffSplitText = function(oldText, newText, text) {
- 
-// convert strange spaces
-  oldText = oldText.replace(/[\t\u000b\u00a0\u2028\u2029]+/g, ' ');
-  newText = newText.replace(/[\t\u000b\u00a0\u2028\u2029]+/g, ' ');
- 
-// split old text into words
- 
-//              /     |    |    |    |    |   |  |     |   |  |  |    |    |    | /
-  var pattern = /[\w]+|\[\[|\]\]|\{\{|\}\}|\n+| +|&\w+;|'''|''|=+|\{\||\|\}|\|\-|./g;
-  var result;
-  do {
-    result = pattern.exec(oldText);
-    if (result != null) {
-      text.oldWords.push(result[0]);
-    }
-  } while (result != null);
- 
-// split new text into words
-  do {
-    result = pattern.exec(newText);
-    if (result != null) {
-      text.newWords.push(result[0]);
-    }
-  } while (result != null);
- 
-  return;
-}
- 
- 
-// WDiffText: calculate diff information
-// input: text.newWords and text.oldWords, arrays containing the texts in arrays of words
-// optionally for recursive calls: newStart, newEnd, oldStart, oldEnd, recursionLevel
-// changes: text.newToOld and text.oldToNew, containing the line numbers in the other version
- 
-window.WDiffText = function(text, newStart, newEnd, oldStart, oldEnd, recursionLevel) {
- 
-  symbol = new Object();
-  symbol.newCtr = [];
-  symbol.oldCtr = [];
-  symbol.toNew = [];
-  symbol.toOld = [];
- 
-// set defaults
-  newStart = newStart || 0;
-  newEnd = newEnd || text.newWords.length;
-  oldStart = oldStart || 0;
-  oldEnd = oldEnd || text.oldWords.length;
-  recursionLevel = recursionLevel || 0;
- 
-// limit recursion depth
-  if (recursionLevel > 10) {
-    return;
-  }
- 
-// pass 1: parse new text into symbol table s
- 
-  var word;
-  for (var i = newStart; i < newEnd; i ++) {
-    word = text.newWords[i];
- 
-// add new entry to symbol table
-    if ( symbol[word] == null) {
-      symbol[word] = { newCtr: 0, oldCtr: 0, toNew: null, toOld: null };
-    }
- 
-// increment symbol table word counter for new text
-    symbol[word].newCtr ++;
- 
-// add last word number in new text
-    symbol[word].toNew = i;
-  }
- 
-// pass 2: parse old text into symbol table
- 
-  for (var j = oldStart; j < oldEnd; j ++) {
-    word = text.oldWords[j];
- 
-// add new entry to symbol table
-    if ( symbol[word] == null) {
-      symbol[word] = { newCtr: 0, oldCtr: 0, toNew: null, toOld: null };
-    }
- 
-// increment symbol table word counter for old text
-    symbol[word].oldCtr ++;
- 
-// add last word number in old text
-    symbol[word].toOld = j;
-  }
- 
-// pass 3: connect unique words
- 
-  for (var i in symbol) {
- 
-// find words in the symbol table that occur only once in both versions
-    if ( (symbol[i].newCtr == 1) && (symbol[i].oldCtr == 1) ) {
-      var toNew = symbol[i].toNew;
-      var toOld = symbol[i].toOld;
- 
-// do not use spaces as unique markers
-      if ( ! /\s/.test( text.newWords[toNew] ) ) {
- 
-// connect from new to old and from old to new
-        text.newToOld[toNew] = toOld;
-        text.oldToNew[toOld] = toNew;
-      }
-    }
-  }
- 
-// pass 4: connect adjacent identical words downwards
- 
-  for (var i = newStart; i < newEnd - 1; i ++) {
- 
-// find already connected pairs
-    if (text.newToOld[i] != null) {
-      j = text.newToOld[i];
- 
-// check if the following words are not yet connected
-      if ( (text.newToOld[i + 1] == null) && (text.oldToNew[j + 1] == null) ) {
- 
-// if the following words are the same connect them
-        if ( text.newWords[i + 1] == text.oldWords[j + 1] ) {
-          text.newToOld[i + 1] = j + 1;
-          text.oldToNew[j + 1] = i + 1;
-        }
-      }
-    }
-  }
- 
-// pass 5: connect adjacent identical words upwards
- 
-  for (var i = newEnd - 1; i > newStart; i --) {
- 
-// find already connected pairs
-    if (text.newToOld[i] != null) {
-      j = text.newToOld[i];
- 
-// check if the preceeding words are not yet connected
-      if ( (text.newToOld[i - 1] == null) && (text.oldToNew[j - 1] == null) ) {
- 
-// if the preceeding words are the same connect them
-        if ( text.newWords[i - 1] == text.oldWords[j - 1] ) {
-          text.newToOld[i - 1] = j - 1;
-          text.oldToNew[j - 1] = i - 1;
-        }
-      }
-    }
-  }
- 
-// recursively diff still unresolved regions downwards
- 
-  if (wDiffRecursiveDiff) {
-    i = newStart;
-    j = oldStart;
-    while (i < newEnd) {
-      if (text.newToOld[i - 1] != null) {
-        j = text.newToOld[i - 1] + 1;
-      }
- 
-// check for the start of an unresolved sequence
-      if ( (text.newToOld[i] == null) && (text.oldToNew[j] == null) ) {
- 
-// determine the ends of the sequences
-        var iStart = i;
-        var iEnd = i;
-        while ( (text.newToOld[iEnd] == null) && (iEnd < newEnd) ) {
-          iEnd ++;
-        }
-        var iLength = iEnd - iStart;
- 
-        var jStart = j;
-        var jEnd = j;
-        while ( (text.oldToNew[jEnd] == null) && (jEnd < oldEnd) ) {
-          jEnd ++;
-        }
-        var jLength = jEnd - jStart;
- 
-// recursively diff the unresolved sequence
-        if ( (iLength > 0) && (jLength > 0) ) {
-          if ( (iLength > 1) || (jLength > 1) ) {
-            if ( (iStart != newStart) || (iEnd != newEnd) || (jStart != oldStart) || (jEnd != oldEnd) ) {
-              WDiffText(text, iStart, iEnd, jStart, jEnd, recursionLevel + 1);
-            }
-          }
-        }
-        i = iEnd;
-      }
-      else {
-        i ++;
-      }
-    }
-  }
- 
-// recursively diff still unresolved regions upwards
- 
-  if (wDiffRecursiveDiff) {
-    i = newEnd - 1;
-    j = oldEnd - 1;
-    while (i >= newStart) {
-      if (text.newToOld[i + 1] != null) {
-        j = text.newToOld[i + 1] - 1;
-      }
- 
-// check for the start of an unresolved sequence
-      if ( (text.newToOld[i] == null) && (text.oldToNew[j] == null) ) {
- 
-// determine the ends of the sequences
-        var iStart = i;
-        var iEnd = i + 1;
-        while ( (text.newToOld[iStart - 1] == null) && (iStart >= newStart) ) {
-          iStart --;
-        }
-        var iLength = iEnd - iStart;
- 
-        var jStart = j;
-        var jEnd = j + 1;
-        while ( (text.oldToNew[jStart - 1] == null) && (jStart >= oldStart) ) {
-          jStart --;
-        }
-        var jLength = jEnd - jStart;
- 
-// recursively diff the unresolved sequence
-        if ( (iLength > 0) && (jLength > 0) ) {
-          if ( (iLength > 1) || (jLength > 1) ) {
-            if ( (iStart != newStart) || (iEnd != newEnd) || (jStart != oldStart) || (jEnd != oldEnd) ) {
-              WDiffText(text, iStart, iEnd, jStart, jEnd, recursionLevel + 1);
-            }
-          }
-        }
-        i = iStart - 1;
-      }
-      else {
-        i --;
-      }
-    }
-  }
-  return;
-}
- 
- 
-// WDiffToHtml: process diff data into formatted html text
-// input: text.newWords and text.oldWords, arrays containing the texts in arrays of words
-//   text.newToOld and text.oldToNew, containing the line numbers in the other version
-//   block data structure
-// returns: outText, a html string
- 
-window.WDiffToHtml = function(text, block) {
- 
-  var outText = text.message;
- 
-  var blockNumber = 0;
-  var i = 0;
-  var j = 0;
-  var movedAsInsertion;
- 
-// cycle through the new text
-  do {
-    var movedIndex = [];
-    var movedBlock = [];
-    var movedLeft = [];
-    var blockText = '';
-    var identText = '';
-    var delText = '';
-    var insText = '';
-    var identStart = '';
- 
-// check if a block ends here and finish previous block
-    if (movedAsInsertion != null) {
-      if (movedAsInsertion == false) {
-        identStart += wDiffHtmlBlockEnd;
-      }
-      else {
-        identStart += wDiffHtmlInsertEnd;
-      }
-      movedAsInsertion = null;
-    }
- 
-// detect block boundary
-    if ( (text.newToOld[i] != j) || (blockNumber == 0 ) ) {
-      if ( ( (text.newToOld[i] != null) || (i >= text.newWords.length) ) && ( (text.oldToNew[j] != null) || (j >= text.oldWords.length) ) ) {
- 
-// block moved right
-        var moved = block.newRight[blockNumber];
-        if (moved > 0) {
-          var index = block.newRightIndex[blockNumber];
-          movedIndex.push(index);
-          movedBlock.push(moved);
-          movedLeft.push(false);
-        }
- 
-// block moved left
-        moved = block.newLeft[blockNumber];
-        if (moved > 0) {
-          var index = block.newLeftIndex[blockNumber];
-          movedIndex.push(index);
-          movedBlock.push(moved);
-          movedLeft.push(true);
-        }
- 
-// check if a block starts here
-        moved = block.newBlock[blockNumber];
-        if (moved > 0) {
- 
-// mark block as inserted text
-          if (block.newWords[blockNumber] < wDiffBlockMinLength) {
-            identStart += wDiffHtmlInsertStart;
-            movedAsInsertion = true;
-          }
- 
-// mark block by color
-          else {
-            if (moved > wDiffStyleBlock.length) {
-              moved = wDiffStyleBlock.length;
-            }
-            identStart += WDiffHtmlCustomize(wDiffHtmlBlockStart, moved - 1);
-            movedAsInsertion = false;
-          }
-        }
- 
-        if (i >= text.newWords.length) {
-          i ++;
-        }
-        else {
-          j = text.newToOld[i];
-          blockNumber ++;
-        }
-      }
-    }
- 
-// get the correct order if moved to the left as well as to the right from here
-    if (movedIndex.length == 2) {
-      if (movedIndex[0] > movedIndex[1]) {
-        movedIndex.reverse();
-        movedBlock.reverse();
-        movedLeft.reverse();
-      }
-    }
- 
-// handle left and right block moves from this position
-    for (var m = 0; m < movedIndex.length; m ++) {
- 
-// insert the block as deleted text
-      if (block.newWords[ movedIndex[m] ] < wDiffBlockMinLength) {
-        var movedStart = block.newStart[ movedIndex[m] ];
-        var movedLength = block.newLength[ movedIndex[m] ];
-        var str = '';
-        for (var n = movedStart; n < movedStart + movedLength; n ++) {
-          str += text.newWords[n];
-        }
-        str = WDiffEscape(str);
-        str = str.replace(/\n/g, '&para;<br>');
-        blockText += wDiffHtmlDeleteStart + str + wDiffHtmlDeleteEnd;
-      }
- 
-// add a placeholder / move direction indicator
-      else {
-        if (movedBlock[m] > wDiffStyleBlock.length) {
-          movedBlock[m] = wDiffStyleBlock.length;
-        }
-        if (movedLeft[m]) {
-          blockText += WDiffHtmlCustomize(wDiffHtmlMovedLeft, movedBlock[m] - 1);
-        }
-        else {
-          blockText += WDiffHtmlCustomize(wDiffHtmlMovedRight, movedBlock[m] - 1);
-        }
-      }
-    }
- 
-// collect consecutive identical text
-    while ( (i < text.newWords.length) && (j < text.oldWords.length) ) {
-      if ( (text.newToOld[i] == null) || (text.oldToNew[j] == null) ) {
-        break;
-      }
-      if (text.newToOld[i] != j) {
-        break;
-      }
-      identText += text.newWords[i];
-      i ++;
-      j ++;
-    }
- 
-// collect consecutive deletions
-    while ( (text.oldToNew[j] == null) && (j < text.oldWords.length) ) {
-      delText += text.oldWords[j];
-      j ++;
-    }
- 
-// collect consecutive inserts
-    while ( (text.newToOld[i] == null) && (i < text.newWords.length) ) {
-      insText += text.newWords[i];
-      i ++;
-    }
- 
-// remove leading and trailing similarities betweein delText and ins from highlighting
-    var preText = '';
-    var postText = '';
-    if (wDiffWordDiff) {
-      if ( (delText != '') && (insText != '') ) {
- 
-// remove leading similarities
-        while ( delText.charAt(0) == insText.charAt(0) && (delText != '') && (insText != '') ) {
-          preText = preText + delText.charAt(0);
-          delText = delText.substr(1);
-          insText = insText.substr(1);
-        }
- 
-// remove trailing similarities
-        while ( delText.charAt(delText.length - 1) == insText.charAt(insText.length - 1) && (delText != '') && (insText != '') ) {
-          postText = delText.charAt(delText.length - 1) + postText;
-          delText = delText.substr(0, delText.length - 1);
-          insText = insText.substr(0, insText.length - 1);
-        }
-      }
-    }
- 
-// output the identical text, deletions and inserts
- 
-// moved from here indicator
-    if (blockText != '') {
-      outText += blockText;
-    }
- 
-// identical text
-    if (identText != '') {
-      outText += identStart + WDiffEscape(identText);
-    }
-    outText += preText;
- 
-// deleted text
-    if (delText != '') {
-      delText = wDiffHtmlDeleteStart + WDiffEscape(delText) + wDiffHtmlDeleteEnd;
-      delText = delText.replace(/\n/g, '&para;<br>');
-      outText += delText;
-    }
- 
-// inserted text
-    if (insText != '') {
-      insText = wDiffHtmlInsertStart + WDiffEscape(insText) + wDiffHtmlInsertEnd;
-      insText = insText.replace(/\n/g, '&para;<br>');
-      outText += insText;
-    }
-    outText += postText;
-  } while (i <= text.newWords.length);
- 
-  outText += '\n';
-  outText = WDiffHtmlFormat(outText);
- 
-  return(outText);
-}
- 
- 
-// WDiffEscape: replaces html-sensitive characters in output text with character entities
- 
-window.WDiffEscape = function(text) {
- 
-  text = text.replace(/&/g, '&amp;');
-  text = text.replace(/</g, '&lt;');
-  text = text.replace(/>/g, '&gt;');
-  text = text.replace(/\"/g, '&quot;');
- 
-  return(text);
-}
- 
- 
-// HtmlCustomize: customize indicator html: replace {number} with the block number, {block} with the block style
- 
-window.WDiffHtmlCustomize = function(text, block) {
- 
-  text = text.replace(/\{number\}/, block);
-  text = text.replace(/\{block\}/, wDiffStyleBlock[block]);
- 
-  return(text);
-}
- 
- 
-// HtmlFormat: replaces newlines and multiple spaces in text with html code
- 
-window.WDiffHtmlFormat = function(text) {
- 
-  text = text.replace(/  /g, ' &nbsp;');
-  text = text.replace(/\n/g, '<br>');
- 
-  return(text);
-}
- 
- 
-// WDiffDetectBlocks: detect block borders and moved blocks
-// input: text object, block object
- 
-window.WDiffDetectBlocks = function(text, block) {
- 
-  block.oldStart  = [];
-  block.oldToNew  = [];
-  block.oldLength = [];
-  block.oldWords  = [];
-  block.newStart  = [];
-  block.newLength = [];
-  block.newWords  = [];
-  block.newNumber = [];
-  block.newBlock  = [];
-  block.newLeft   = [];
-  block.newRight  = [];
-  block.newLeftIndex  = [];
-  block.newRightIndex = [];
- 
-  var blockNumber = 0;
-  var wordCounter = 0;
-  var realWordCounter = 0;
- 
-// get old text block order
-  if (wDiffShowBlockMoves) {
-    var j = 0;
-    var i = 0;
-    do {
- 
-// detect block boundaries on old text
-      if ( (text.oldToNew[j] != i) || (blockNumber == 0 ) ) {
-        if ( ( (text.oldToNew[j] != null) || (j >= text.oldWords.length) ) && ( (text.newToOld[i] != null) || (i >= text.newWords.length) ) ) {
-          if (blockNumber > 0) {
-            block.oldLength[blockNumber - 1] = wordCounter;
-            block.oldWords[blockNumber - 1] = realWordCounter;
-            wordCounter = 0;
-            realWordCounter = 0;
-          }
- 
-          if (j >= text.oldWords.length) {
-            j ++;
-          }
-          else {
-            i = text.oldToNew[j];
-            block.oldStart[blockNumber] = j;
-            block.oldToNew[blockNumber] = text.oldToNew[j];
-            blockNumber ++;
-          }
-        }
-      }
- 
-// jump over identical pairs
-      while ( (i < text.newWords.length) && (j < text.oldWords.length) ) {
-        if ( (text.newToOld[i] == null) || (text.oldToNew[j] == null) ) {
-          break;
-        }
-        if (text.oldToNew[j] != i) {
-          break;
-        }
-        i ++;
-        j ++;
-        wordCounter ++;
-        if ( /\w/.test( text.newWords[i] ) ) {
-          realWordCounter ++;
-        }
-      }
- 
-// jump over consecutive deletions
-      while ( (text.oldToNew[j] == null) && (j < text.oldWords.length) ) {
-        j ++;
-      }
- 
-// jump over consecutive inserts
-      while ( (text.newToOld[i] == null) && (i < text.newWords.length) ) {
-        i ++;
-      }
-    } while (j <= text.oldWords.length);
- 
-// get the block order in the new text
-    var lastMin;
-    var currMinIndex;
-    lastMin = null;
- 
-// sort the data by increasing start numbers into new text block info
-    for (var i = 0; i < blockNumber; i ++) {
-      currMin = null;
-      for (var j = 0; j < blockNumber; j ++) {
-        curr = block.oldToNew[j];
-        if ( (curr > lastMin) || (lastMin == null) ) {
-          if ( (curr < currMin) || (currMin == null) ) {
-            currMin = curr;
-            currMinIndex = j;
-          }
-        }
-      }
-      block.newStart[i] = block.oldToNew[currMinIndex];
-      block.newLength[i] = block.oldLength[currMinIndex];
-      block.newWords[i] = block.oldWords[currMinIndex];
-      block.newNumber[i] = currMinIndex;
-      lastMin = currMin;
-    }
- 
-// detect not moved blocks
-    for (var i = 0; i < blockNumber; i ++) {
-      if (block.newBlock[i] == null) {
-        if (block.newNumber[i] == i) {
-          block.newBlock[i] = 0;
-        }
-      }
-    }
- 
-// detect switches of neighbouring blocks
-    for (var i = 0; i < blockNumber - 1; i ++) {
-      if ( (block.newBlock[i] == null) && (block.newBlock[i + 1] == null) ) {
-        if (block.newNumber[i] - block.newNumber[i + 1] == 1) {
-          if ( (block.newNumber[i + 1] - block.newNumber[i + 2] != 1) || (i + 2 >= blockNumber) ) {
- 
-// the shorter one is declared the moved one
-            if (block.newLength[i] < block.newLength[i + 1]) {
-              block.newBlock[i] = 1;
-              block.newBlock[i + 1] = 0;
-            }
-            else {
-              block.newBlock[i] = 0;
-              block.newBlock[i + 1] = 1;
-            }
-          }
-        }
-      }
-    }
- 
-// mark all others as moved and number the moved blocks
-    j = 1;
-    for (var i = 0; i < blockNumber; i ++) {
-      if ( (block.newBlock[i] == null) || (block.newBlock[i] == 1) ) {
-        block.newBlock[i] = j++;
-      }
-    }
- 
-// check if a block has been moved from this block border
-    for (var i = 0; i < blockNumber; i ++) {
-      for (var j = 0; j < blockNumber; j ++) {
- 
-        if (block.newNumber[j] == i) {
-          if (block.newBlock[j] > 0) {
- 
-// block moved right
-            if (block.newNumber[j] < j) {
-              block.newRight[i] = block.newBlock[j];
-              block.newRightIndex[i] = j;
-            }
- 
-// block moved left
-            else {
-              block.newLeft[i + 1] = block.newBlock[j];
-              block.newLeftIndex[i + 1] = j;
-            }
-          }
-        }
-      }
-    }
-  }
-  return;
-}
- 
- 
-// WDiffShortenOutput: remove unchanged parts from final output
-// input: the output of WDiffString
-// returns: the text with removed unchanged passages indicated by (...)
- 
-window.WDiffShortenOutput = function(diffText) {
- 
-// html <br/> to newlines
-  diffText = diffText.replace(/<br[^>]*>/g, '\n');
- 
-// scan for diff html tags
-  var regExpDiff = new RegExp('<\\w+ class=\\"(\\w+)\\"[^>]*>(.|\\n)*?<!--\\1-->', 'g');
-  var tagStart = [];
-  var tagEnd = [];
-  var i = 0;
-  var found;
-  while ( (found = regExpDiff.exec(diffText)) != null ) {
- 
-// combine consecutive diff tags
-    if ( (i > 0) && (tagEnd[i - 1] == found.index) ) {
-      tagEnd[i - 1] = found.index + found[0].length;
-    }
-    else {
-      tagStart[i] = found.index;
-      tagEnd[i] = found.index + found[0].length;
-      i ++;
-    }
-  }
- 
-// no diff tags detected
-  if (tagStart.length == 0) {
-    return(wDiffNoChange);
-  }
- 
-// define regexps
-  var regExpHeading = new RegExp('\\n=+.+?=+ *\\n|\\n\\{\\||\\n\\|\\}', 'g');
-  var regExpParagraph = new RegExp('\\n\\n+', 'g');
-  var regExpLine = new RegExp('\\n+', 'g');
-  var regExpBlank = new RegExp('(<[^>]+>)*\\s+', 'g');
- 
-// determine fragment border positions around diff tags
-  var rangeStart = [];
-  var rangeEnd = [];
-  var rangeStartType = [];
-  var rangeEndType = [];
-  for (var i = 0; i < tagStart.length; i ++) {
-    var found;
- 
-// find last heading before diff tag
-    var lastPos = tagStart[i] - wDiffHeadingBefore;
-    if (lastPos < 0) {
-      lastPos = 0;
-    }
-    regExpHeading.lastIndex = lastPos;
-    while ( (found = regExpHeading.exec(diffText)) != null ) {
-      if (found.index > tagStart[i]) {
-        break;
-      }
-      rangeStart[i] = found.index;
-      rangeStartType[i] = 'heading';
-    }
- 
-// find last paragraph before diff tag
-    if (rangeStart[i] == null) {
-      lastPos = tagStart[i] - wDiffParagraphBefore;
-      if (lastPos < 0) {
-        lastPos = 0;
-      }
-      regExpParagraph.lastIndex = lastPos;
-      while ( (found = regExpParagraph.exec(diffText)) != null ) {
-        if (found.index > tagStart[i]) {
-          break;
-        }
-        rangeStart[i] = found.index;
-        rangeStartType[i] = 'paragraph';
-      }
-    }
- 
-// find line break before diff tag
-    if (rangeStart[i] == null) {
-      lastPos = tagStart[i] - wDiffLineBeforeMax;
-      if (lastPos < 0) {
-        lastPos = 0;
-      }
-      regExpLine.lastIndex = lastPos;
-      while ( (found = regExpLine.exec(diffText)) != null ) {
-        if (found.index > tagStart[i] - wDiffLineBeforeMin) {
-          break;
-        }
-        rangeStart[i] = found.index;
-        rangeStartType[i] = 'line';
-      }
-    }
- 
-// find blank before diff tag
-    if (rangeStart[i] == null) {
-      lastPos = tagStart[i] - wDiffBlankBeforeMax;
-      if (lastPos < 0) {
-        lastPos = 0;
-      }
-      regExpBlank.lastIndex = lastPos;
-      while ( (found = regExpBlank.exec(diffText)) != null ) {
-        if (found.index > tagStart[i] - wDiffBlankBeforeMin) {
-          break;
-        }
-        rangeStart[i] = found.index;
-        rangeStartType[i] = 'blank';
-      }
-    }
- 
-// fixed number of chars before diff tag
-    if (rangeStart[i] == null) {
-      rangeStart[i] = tagStart[i] - wDiffCharsBefore;
-      rangeStartType[i] = 'chars';
-      if (rangeStart[i] < 0) {
-        rangeStart[i] = 0;
-      }
-    }
- 
-// find first heading after diff tag
-    regExpHeading.lastIndex = tagEnd[i];
-    if ( (found = regExpHeading.exec(diffText)) != null ) {
-      if (found.index < tagEnd[i] + wDiffHeadingAfter) {
-        rangeEnd[i] = found.index + found[0].length;
-        rangeEndType[i] = 'heading';
-      }
-    }
- 
-// find first paragraph after diff tag
-    if (rangeEnd[i] == null) {
-      regExpParagraph.lastIndex = tagEnd[i];
-      if ( (found = regExpParagraph.exec(diffText)) != null ) {
-        if (found.index < tagEnd[i] + wDiffParagraphAfter) {
-          rangeEnd[i] = found.index;
-          rangeEndType[i] = 'paragraph';
-        }
-      }
-    }
- 
-// find first line break after diff tag
-    if (rangeEnd[i] == null) {
-      regExpLine.lastIndex = tagEnd[i] + wDiffLineAfterMin;
-      if ( (found = regExpLine.exec(diffText)) != null ) {
-        if (found.index < tagEnd[i] + wDiffLineAfterMax) {
-          rangeEnd[i] = found.index;
-          rangeEndType[i] = 'break';
-        }
-      }
-    }
- 
-// find blank after diff tag
-    if (rangeEnd[i] == null) {
-      regExpBlank.lastIndex = tagEnd[i] + wDiffBlankAfterMin;
-      if ( (found = regExpBlank.exec(diffText)) != null ) {
-        if (found.index < tagEnd[i] + wDiffBlankAfterMax) {
-          rangeEnd[i] = found.index;
-          rangeEndType[i] = 'blank';
-        }
-      }
-    }
- 
-// fixed number of chars after diff tag
-    if (rangeEnd[i] == null) {
-      rangeEnd[i] = tagEnd[i] + wDiffCharsAfter;
-      if (rangeEnd[i] > diffText.length) {
-        rangeEnd[i] = diffText.length;
-        rangeEndType[i] = 'chars';
-      }
-    }
-  }
- 
-// remove overlaps, join close fragments
-  var fragmentStart = [];
-  var fragmentEnd = [];
-  var fragmentStartType = [];
-  var fragmentEndType = [];
-  fragmentStart[0] = rangeStart[0];
-  fragmentEnd[0] = rangeEnd[0];
-  fragmentStartType[0] = rangeStartType[0];
-  fragmentEndType[0] = rangeEndType[0];
-  var j = 1;
-  for (var i = 1; i < rangeStart.length; i ++) {
-    if (rangeStart[i] > fragmentEnd[j - 1] + wDiffFragmentJoin) {
-      fragmentStart[j] = rangeStart[i];
-      fragmentEnd[j] = rangeEnd[i];
-      fragmentStartType[j] = rangeStartType[i];
-      fragmentEndType[j] = rangeEndType[i];
-      j ++;
-    }
-    else {
-      fragmentEnd[j - 1] = rangeEnd[i];
-      fragmentEndType[j - 1] = rangeEndType[i];
-    }
-  }
- 
-// assemble the fragments
-  var outText = '';
-  for (var i = 0; i < fragmentStart.length; i ++) {
- 
-// get text fragment
-    var fragment = diffText.substring(fragmentStart[i], fragmentEnd[i]);
-    var fragment = fragment.replace(/^\n+|\n+$/g, '');
- 
-// add inline marks for omitted chars and words
-    if (fragmentStart[i] > 0) {
-      if (fragmentStartType[i] == 'chars') {
-        fragment = wDiffOmittedChars + fragment;
-      }
-      else if (fragmentStartType[i] == 'blank') {
-        fragment = wDiffOmittedChars + ' ' + fragment;
-      }
-    }
-    if (fragmentEnd[i] < diffText.length) {
-      if (fragmentStartType[i] == 'chars') {
-        fragment = fragment + wDiffOmittedChars;
-      }
-      else if (fragmentStartType[i] == 'blank') {
-        fragment = fragment + ' ' + wDiffOmittedChars;
-      }
-    }
- 
-// add omitted line separator
-    if (fragmentStart[i] > 0) {
-      outText += wDiffOmittedLines;
-    }
- 
-// encapsulate span errors
-    outText += '<div>' + fragment + '</div>';
-  }
- 
-// add trailing omitted line separator
-  if (fragmentEnd[i - 1] < diffText.length) {
-    outText = outText + wDiffOmittedLines;
-  }
- 
-// remove leading and trailing empty lines
-  outText = outText.replace(/^(<div>)\n+|\n+(<\/div>)$/g, '$1$2');
- 
-// convert to html linebreaks
-  outText = outText.replace(/\n/g, '<br />');
- 
-  return(outText);
-}
- 
- 
-// <pre><nowiki>
\ No newline at end of file
diff --git a/public/stylesheets/admin.css b/public/stylesheets/admin.css
index 38c9e5a..1bb6cf4 100644
--- a/public/stylesheets/admin.css
+++ b/public/stylesheets/admin.css
@@ -511,6 +511,31 @@ table.revisions_table tr:hover {
   background-color: #f1f1f1;
 }
 
+#diffview del {
+  background: #ffd7d5;
+  color: #82071e;
+  text-decoration: line-through;
+  padding: 0 2px;
+  border-radius: 2px;
+}
+
+#diffview ins {
+  background: #ccffd8;
+  color: #055d20;
+  text-decoration: none;
+  padding: 0 2px;
+  border-radius: 2px;
+}
+
+#diffview .diff_side_by_side {
+  display: flex;
+  gap: 1rem;
+}
+
+#diffview .diff_column {
+  flex: 1;
+}
+
 table.user_table td.user_login {
   padding-right: 30px;
 }
diff --git a/test/controllers/revisions_controller_test.rb b/test/controllers/revisions_controller_test.rb
index b4dcd8f..e2fc976 100644
--- a/test/controllers/revisions_controller_test.rb
+++ b/test/controllers/revisions_controller_test.rb
@@ -59,4 +59,33 @@ class RevisionsControllerTest < ActionController::TestCase
     assert_equal @node.head, @node.pages.first
     assert_equal "first", @node.head.reload.body
   end
+
+  test "diffing two revisions renders real markup with only the changed words marked" do
+    login_as :quentin
+    post(
+      :diff, params: {
+        :node_id => @node.id,
+        :start_revision => @node.pages.first.revision,
+        :end_revision => @node.pages.last.revision
+      }
+    )
+    assert_response :success
+    assert_select "del", "first"
+    assert_select "ins", "second"
+    assert_no_match /&lt;/, response.body
+  end
+
+  test "diffing two revisions in side by side view renders two columns" do
+    login_as :quentin
+    post(
+      :diff, params: {
+        :node_id => @node.id,
+        :start_revision => @node.pages.first.revision,
+        :end_revision => @node.pages.last.revision,
+        :view => "side_by_side"
+      }
+    )
+    assert_response :success
+    assert_select ".diff_column", 2
+  end
 end
diff --git a/test/models/page_test.rb b/test/models/page_test.rb
index ad2742f..ac5691a 100644
--- a/test/models/page_test.rb
+++ b/test/models/page_test.rb
@@ -176,4 +176,38 @@ class PageTest < ActiveSupport::TestCase
     assert_not_equal first_page.id, first_page.node.head_id
     assert first_page.published_at.present?
   end
+
+  def test_diff_against_inline_keeps_tags_and_marks_only_the_changed_word
+    n = Node.root.children.create! :slug => "diff_against_test"
+    d = n.find_or_create_draft @user1
+    d.title = "Old heading"
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft @user1
+    d2.title = "New heading"
+    d2.save!
+
+    diff = d2.diff_against(n.head)
+
+    assert_match "<del>Old</del>", diff[:title]
+    assert_match "<ins>New</ins>", diff[:title]
+  end
+
+  def test_diff_against_side_by_side_returns_two_annotated_strings
+    n = Node.root.children.create! :slug => "diff_against_sbs_test"
+    d = n.find_or_create_draft @user1
+    d.title = "Old heading"
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft @user1
+    d2.title = "New heading"
+    d2.save!
+
+    old_html, new_html = d2.diff_against(n.head, view: :side_by_side)[:title]
+
+    assert_match "<del>Old</del>", old_html
+    assert_match "<ins>New</ins>", new_html
+  end
 end
-- 
cgit v1.3


From fd98a2d3053279bd4a848faa52a3ac676db10cbb Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Fri, 10 Jul 2026 03:59:34 +0200
Subject: Stop diff output from corrupting the document on structural tag
 changes

sdiff aligned an inserted paragraph break correctly, but the renderer
wrapped the raw </p>/<p> tokens in <ins> regardless -- invalid nesting
that browsers silently repair by dropping the unmatched closing tag,
leaving everything downstream rendered inside an <ins> with nothing
left to close it. Same failure mode as the retired cacycle_diff.js,
different cause.

Tag tokens now render as a plain-text pilcrow with a tooltip naming
the actual tag, never as literal markup inside <ins>/<del>. Applies to
both inline and side-by-side. Side-by-side's new panel flattening a
real paragraph break into a marker, rather than showing its own true
structure, is a known, accepted trade-off for now -- not the same
problem, and not fixed here.
---
 lib/html_word_diff.rb    | 36 +++++++++++++++++++++++++++++-------
 test/models/page_test.rb | 18 ++++++++++++++++++
 2 files changed, 47 insertions(+), 7 deletions(-)

(limited to 'test/models/page_test.rb')

diff --git a/lib/html_word_diff.rb b/lib/html_word_diff.rb
index 1f28cf5..aa0cb86 100644
--- a/lib/html_word_diff.rb
+++ b/lib/html_word_diff.rb
@@ -1,4 +1,5 @@
 require 'diff/lcs'
+require 'cgi'
 
 module HtmlWordDiff
   TOKEN_REGEXP = /<[^>]*>|[[:space:]]+|[[:alnum:]]+|[^[:space:][:alnum:]<>]/
@@ -10,11 +11,12 @@ module HtmlWordDiff
       when '='
         html << new_token
       when '-'
-        html << "<del>#{old_token}</del>"
+        html << wrap_removed(old_token)
       when '+'
-        html << "<ins>#{new_token}</ins>"
+        html << wrap_inserted(new_token)
       when '!'
-        html << "<del>#{old_token}</del><ins>#{new_token}</ins>"
+        html << wrap_removed(old_token)
+        html << wrap_inserted(new_token)
       end
     end
     html
@@ -29,12 +31,12 @@ module HtmlWordDiff
         old_out << old_token
         new_out << new_token
       when '-'
-        old_out << "<del>#{old_token}</del>"
+        old_out << wrap_removed(old_token)
       when '+'
-        new_out << "<ins>#{new_token}</ins>"
+        new_out << wrap_inserted(new_token)
       when '!'
-        old_out << "<del>#{old_token}</del>"
-        new_out << "<ins>#{new_token}</ins>"
+        old_out << wrap_removed(old_token)
+        new_out << wrap_inserted(new_token)
       end
     end
     [old_out, new_out]
@@ -49,4 +51,24 @@ module HtmlWordDiff
   def self.tokenize(html)
     html.to_s.scan(TOKEN_REGEXP)
   end
+
+  def self.tag_token?(token)
+    token.to_s.match?(/\A<[^>]*>\z/)
+  end
+
+  def self.wrap_removed(token)
+    if tag_token?(token)
+      %(<del class="diff_structural" title="removed: #{CGI.escapeHTML(token)}">\u00b6</del>)
+    else
+      "<del>#{token}</del>"
+    end
+  end
+
+  def self.wrap_inserted(token)
+    if tag_token?(token)
+      %(<ins class="diff_structural" title="added: #{CGI.escapeHTML(token)}">\u00b6</ins>)
+    else
+      "<ins>#{token}</ins>"
+    end
+  end
 end
diff --git a/test/models/page_test.rb b/test/models/page_test.rb
index ac5691a..3868a53 100644
--- a/test/models/page_test.rb
+++ b/test/models/page_test.rb
@@ -210,4 +210,22 @@ class PageTest < ActiveSupport::TestCase
     assert_match "<del>Old</del>", old_html
     assert_match "<ins>New</ins>", new_html
   end
+
+  test "diff_against handles an inserted paragraph split without corrupting the document" do
+    n = Node.root.children.create! :slug => "paragraph_split_test"
+    d = n.find_or_create_draft @user1
+    d.body = "<p>Der Vortragsraum ist ab 19 Uhr geöffnet, der Zugang erfolgt über den Hinterhof.</p>"
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft @user1
+    d2.body = "<p>Der Vortragsraum ist ab 19 Uhr geöffnet,</p>\n<p>der Zugang erfolgt über den Hinterhof.</p>"
+    d2.save!
+
+    diff = d2.diff_against(n.head)
+    fragment = Nokogiri::HTML::DocumentFragment.parse(diff[:body])
+
+    assert_equal 2, fragment.css('ins.diff_structural').length
+    assert_match "der Zugang erfolgt über den Hinterhof.", fragment.text
+  end
 end
-- 
cgit v1.3


From 30ed9fd9a8bffb44e6ab91dfedb8c0e33837769a Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Fri, 10 Jul 2026 04:41:54 +0200
Subject: Include assets, tags and template in diff between revisions

---
 app/models/page.rb                            | 33 ++++++++++++--------
 app/views/revisions/diff.html.erb             | 27 +++++++++++++++++
 public/stylesheets/admin.css                  | 11 +++++++
 test/controllers/revisions_controller_test.rb | 13 ++++++++
 test/models/page_test.rb                      | 43 +++++++++++++++++++++++++++
 5 files changed, 114 insertions(+), 13 deletions(-)

(limited to 'test/models/page_test.rb')

diff --git a/app/models/page.rb b/app/models/page.rb
index ea04cd6..740d42e 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -176,19 +176,26 @@ class Page < ApplicationRecord
   end
 
   def diff_against other, view: :inline
-    if view == :side_by_side
-      {
-        title:    HtmlWordDiff.side_by_side(other.title.to_s,    title.to_s),
-        abstract: HtmlWordDiff.side_by_side(other.abstract.to_s, abstract.to_s),
-        body:     HtmlWordDiff.side_by_side(other.body.to_s,     body.to_s)
-      }
-    else
-      {
-        title:    HtmlWordDiff.inline(other.title.to_s,    title.to_s),
-        abstract: HtmlWordDiff.inline(other.abstract.to_s, abstract.to_s),
-        body:     HtmlWordDiff.inline(other.body.to_s,     body.to_s)
-      }
-    end
+    text_diffs =
+      if view == :side_by_side
+        {
+          title:    HtmlWordDiff.side_by_side(other.title.to_s,    title.to_s),
+          abstract: HtmlWordDiff.side_by_side(other.abstract.to_s, abstract.to_s),
+          body:     HtmlWordDiff.side_by_side(other.body.to_s,     body.to_s)
+        }
+      else
+        {
+          title:    HtmlWordDiff.inline(other.title.to_s,    title.to_s),
+          abstract: HtmlWordDiff.inline(other.abstract.to_s, abstract.to_s),
+          body:     HtmlWordDiff.inline(other.body.to_s,     body.to_s)
+        }
+      end
+
+    text_diffs.merge(
+      tags:          { added: tag_list.to_a - other.tag_list.to_a, removed: other.tag_list.to_a - tag_list.to_a },
+      template_name: { from: other.template_name, to: template_name, changed: template_name != other.template_name },
+      assets:        { added: assets.to_a - other.assets.to_a, removed: other.assets.to_a - assets.to_a }
+    )
   end
 
   def public?
diff --git a/app/views/revisions/diff.html.erb b/app/views/revisions/diff.html.erb
index d70503c..b9ce6bd 100644
--- a/app/views/revisions/diff.html.erb
+++ b/app/views/revisions/diff.html.erb
@@ -85,4 +85,31 @@
     <h3>Body</h3>
     <%= raw @diff[:body] %>
   <% end %>
+
+  <h3>Tags</h3>
+  <% if @diff[:tags][:added].empty? && @diff[:tags][:removed].empty? %>
+    <p class="diff_unchanged">No change.</p>
+  <% else %>
+    <ul class="diff_set_list">
+      <% @diff[:tags][:added].each do |tag| %><li><ins><%= tag %></ins></li><% end %>
+      <% @diff[:tags][:removed].each do |tag| %><li><del><%= tag %></del></li><% end %>
+    </ul>
+  <% end %>
+
+  <h3>Template</h3>
+  <% if @diff[:template_name][:changed] %>
+    <p><del><%= @diff[:template_name][:from] || '(none)' %></del> <ins><%= @diff[:template_name][:to] || '(none)' %></ins></p>
+  <% else %>
+    <p class="diff_unchanged">No change.</p>
+  <% end %>
+
+  <h3>Assets</h3>
+  <% if @diff[:assets][:added].empty? && @diff[:assets][:removed].empty? %>
+    <p class="diff_unchanged">No change.</p>
+  <% else %>
+    <ul class="diff_set_list">
+      <% @diff[:assets][:added].each do |asset| %><li><ins><%= asset.upload_file_name %></ins></li><% end %>
+      <% @diff[:assets][:removed].each do |asset| %><li><del><%= asset.upload_file_name %></del></li><% end %>
+    </ul>
+  <% end %>
 </div>
diff --git a/public/stylesheets/admin.css b/public/stylesheets/admin.css
index e04499d..7b39c72 100644
--- a/public/stylesheets/admin.css
+++ b/public/stylesheets/admin.css
@@ -549,6 +549,17 @@ table.revisions_table tr:hover {
   cursor: help;
 }
 
+.diff_unchanged {
+  color: #969696;
+  font-style: italic;
+}
+
+.diff_set_list {
+  list-style: none;
+  padding-left: 0;
+  margin: 0;
+}
+
 table.user_table td.user_login {
   padding-right: 30px;
 }
diff --git a/test/controllers/revisions_controller_test.rb b/test/controllers/revisions_controller_test.rb
index bf92c5b..53927b4 100644
--- a/test/controllers/revisions_controller_test.rb
+++ b/test/controllers/revisions_controller_test.rb
@@ -148,4 +148,17 @@ class RevisionsControllerTest < ActionController::TestCase
     assert_response :success
     assert_select "a", "Side by side"
   end
+
+  test "diffing two revisions also shows tag, template, and asset changes" do
+    login_as :quentin
+    @node.find_or_create_draft(@user)
+    @node.draft.tag_list = "update"
+    @node.draft.save!
+
+    post(:diff, params: { :node_id => @node.id, :start_revision => @node.pages.first.revision, :end_revision => @node.pages.last.revision })
+    assert_response :success
+    assert_select "h3", "Tags"
+    assert_select "h3", "Template"
+    assert_select "h3", "Assets"
+  end
 end
diff --git a/test/models/page_test.rb b/test/models/page_test.rb
index 3868a53..bcddc89 100644
--- a/test/models/page_test.rb
+++ b/test/models/page_test.rb
@@ -228,4 +228,47 @@ class PageTest < ActiveSupport::TestCase
     assert_equal 2, fragment.css('ins.diff_structural').length
     assert_match "der Zugang erfolgt über den Hinterhof.", fragment.text
   end
+
+  test "diff_against reports tag and template changes" do
+    n = Node.root.children.create! :slug => "field_diff_test"
+    d = n.find_or_create_draft @user1
+    d.tag_list = "update"
+    d.template_name = "standard_template"
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft @user1
+    d2.tag_list = "update, pressemitteilung"
+    d2.template_name = "title_only"
+    d2.save!
+
+    diff = d2.diff_against(n.head)
+
+    assert_equal ["pressemitteilung"], diff[:tags][:added]
+    assert_equal [], diff[:tags][:removed]
+    assert diff[:template_name][:changed]
+    assert_equal "standard_template", diff[:template_name][:from]
+    assert_equal "title_only", diff[:template_name][:to]
+  end
+
+  test "diff_against reports added and removed assets by filename" do
+    n = Node.root.children.create! :slug => "asset_diff_test"
+    d = n.find_or_create_draft @user1
+    d.save!
+    n.publish_draft!
+
+    kept_asset    = Asset.create!(:upload_file_name => "kept.png", :upload_content_type => "image/png", :upload_file_size => 1)
+    removed_asset = Asset.create!(:upload_file_name => "removed.pdf", :upload_content_type => "application/pdf", :upload_file_size => 1)
+    n.head.update_assets([kept_asset.id, removed_asset.id])
+
+    d2 = n.find_or_create_draft @user1
+    added_asset = Asset.create!(:upload_file_name => "added.png", :upload_content_type => "image/png", :upload_file_size => 1)
+    d2.update_assets([kept_asset.id, added_asset.id])
+    d2.save!
+
+    diff = d2.diff_against(n.head)
+
+    assert_equal [added_asset], diff[:assets][:added]
+    assert_equal [removed_asset], diff[:assets][:removed]
+  end
 end
-- 
cgit v1.3


From 4072efdc912ecb3b79621fb1838434f792e3a531 Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Mon, 13 Jul 2026 19:10:55 +0200
Subject: clone_attributes_from: update translations in place, not
 delete+recreate

Every promotion (autosave creation, draft creation, draft save) ran
every locale's translation through delete-all-then-recreate
unconditionally, giving every locale a fresh created_at/updated_at
regardless of whether its content actually changed. Confirmed via
Node.find(546).draft.translations -- both DE and EN shared one
identical timestamp despite only EN having been edited.

This silently defeated Page.find_with_outdated_translations' whole
staleness comparison: every save reset every locale back into
lockstep, so timestamps could never actually drift apart the way
the feature depends on. The existing test for it only ever passed
by manually backdating a timestamp with record_timestamps = false,
bypassing normal save flow entirely -- not something that happens
through ordinary editing.

Now updates a matching locale's translation only when its own
attributes actually differ, creates one genuinely new, and removes
one genuinely gone from the source -- same end state, but real
per-locale timestamps survive an unrelated save. search_vector is
excluded from both the comparison and the copied attributes: it's
DB-trigger-maintained from title/abstract, not real content, and
comparing a precomputed tsvector risked a false 'changed' from
representation noise alone.

Also reloads the source's translations association, not just
self's -- clone_attributes_from previously only guaranteed a fresh
self, leaving any caller holding a page reference across an earlier
mutation vulnerable to reading a stale cached association.
---
 app/models/page.rb       | 67 +++++++++++++++++++++++++-------
 test/models/page_test.rb | 99 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 153 insertions(+), 13 deletions(-)

(limited to 'test/models/page_test.rb')

diff --git a/app/models/page.rb b/app/models/page.rb
index f796228..e5a8d9d 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -176,18 +176,34 @@ class Page < ApplicationRecord
     return nil unless page
 
     self.reload
+    page.translations.reload
 
     # Clone untranslated attributes
     self.tag_list         = page.tag_list
     self.template_name  ||= page.template_name
     self.published_at     = page.published_at
 
-    # Getting rid of the auto-generated empty translations
-    self.translations.delete_all
-
-    # Clone translated attributes
-    page.translations.each do |translation|
-      self.translations.create!(translation.attributes.except("id", "page_id", "created_at", "updated_at"))
+    # Clone translated attributes -- update each locale in place rather
+    # than delete-and-recreate, so a locale whose content is genuinely
+    # unchanged keeps its real created_at/updated_at instead of looking
+    # freshly touched on every single save (which was silently defeating
+    # Page.find_with_outdated_translations' whole staleness comparison).
+    # search_vector is excluded deliberately: it's DB-trigger-maintained
+    # from title/abstract, not real content, and comparing a precomputed
+    # tsvector risked a false "changed" from representation noise alone.
+    source_locales = page.translations.map(&:locale)
+    self.translations.where.not(:locale => source_locales).destroy_all
+
+    page.translations.each do |source_translation|
+      attrs = source_translation.attributes.except("id", "page_id", "created_at", "updated_at", "search_vector")
+      mine  = self.translations.find_by(:locale => source_translation.locale)
+
+      if mine
+        changed_attrs = attrs.reject { |k, v| mine.public_send(k) == v }
+        mine.update!(changed_attrs) if changed_attrs.any?
+      else
+        self.translations.create!(attrs)
+      end
     end
 
     # Clone asset references
@@ -196,19 +212,28 @@ class Page < ApplicationRecord
     self.save
   end
 
-  def diff_against other, view: :inline
+  def diff_against other, view: :inline, locale: nil
+    if locale
+      mine, theirs = translations.find_by(:locale => locale), other.translations.find_by(:locale => locale)
+      my_title, my_abstract, my_body          = mine&.title,   mine&.abstract,   mine&.body
+      their_title, their_abstract, their_body = theirs&.title, theirs&.abstract, theirs&.body
+    else
+      my_title, my_abstract, my_body          = title, abstract, body
+      their_title, their_abstract, their_body = other.title, other.abstract, other.body
+    end
+
     text_diffs =
       if view == :side_by_side
         {
-          title:    HtmlWordDiff.side_by_side(other.title.to_s,    title.to_s),
-          abstract: HtmlWordDiff.side_by_side(other.abstract.to_s, abstract.to_s),
-          body:     HtmlWordDiff.side_by_side(other.body.to_s,     body.to_s)
+          title:    HtmlWordDiff.side_by_side(their_title.to_s,    my_title.to_s),
+          abstract: HtmlWordDiff.side_by_side(their_abstract.to_s, my_abstract.to_s),
+          body:     HtmlWordDiff.side_by_side(their_body.to_s,     my_body.to_s)
         }
       else
         {
-          title:    HtmlWordDiff.inline(other.title.to_s,    title.to_s),
-          abstract: HtmlWordDiff.inline(other.abstract.to_s, abstract.to_s),
-          body:     HtmlWordDiff.inline(other.body.to_s,     body.to_s)
+          title:    HtmlWordDiff.inline(their_title.to_s,    my_title.to_s),
+          abstract: HtmlWordDiff.inline(their_abstract.to_s, my_abstract.to_s),
+          body:     HtmlWordDiff.inline(their_body.to_s,     my_body.to_s)
         }
       end
 
@@ -219,6 +244,22 @@ class Page < ApplicationRecord
     )
   end
 
+  def locale_diff_summary other
+    (translated_locales | other.translated_locales).sort_by(&:to_s).map do |locale|
+      mine   = translations.find_by(:locale => locale)
+      theirs = other.translations.find_by(:locale => locale)
+      {
+        :locale       => locale,
+        :exists_here  => mine.present?,
+        :exists_there => theirs.present?,
+        :changed      => mine.present? != theirs.present? ||
+                          mine&.title != theirs&.title ||
+                          mine&.abstract != theirs&.abstract ||
+                          mine&.body != theirs&.body
+      }
+    end
+  end
+
   def public?
     published_at.nil? ? true : published_at < Time.now
   end
diff --git a/test/models/page_test.rb b/test/models/page_test.rb
index bcddc89..24bc7c5 100644
--- a/test/models/page_test.rb
+++ b/test/models/page_test.rb
@@ -177,6 +177,56 @@ class PageTest < ActiveSupport::TestCase
     assert first_page.published_at.present?
   end
 
+  test "clone_attributes_from preserves an unchanged locale's original timestamp" do
+    n = Node.root.children.create!(:slug => "clone_preserve_timestamp_test")
+    source = n.draft
+    Globalize.with_locale(:de) { source.update!(:title => "Deutscher Titel") }
+    Globalize.with_locale(:en) { source.update!(:title => "English Title") }
+
+    target = Page.create!
+    target.clone_attributes_from(source)
+    original_en_updated_at = target.translations.find_by(:locale => :en).updated_at
+
+    Globalize.with_locale(:de) { source.update!(:title => "Deutscher Titel (bearbeitet)") }
+    target.clone_attributes_from(source)
+
+    en_translation = target.translations.find_by(:locale => :en)
+    assert_equal "English Title", en_translation.title
+    assert_equal original_en_updated_at, en_translation.updated_at
+  end
+
+  test "clone_attributes_from gives a genuinely changed locale a fresh timestamp" do
+    n = Node.root.children.create!(:slug => "clone_fresh_timestamp_test")
+    source = n.draft
+    Globalize.with_locale(:de) { source.update!(:title => "Erste Version") }
+
+    target = Page.create!
+    target.clone_attributes_from(source)
+    original_de_updated_at = target.translations.find_by(:locale => :de).updated_at
+
+    Globalize.with_locale(:de) { source.update!(:title => "Zweite Version") }
+    target.clone_attributes_from(source)
+
+    de_translation = target.translations.find_by(:locale => :de)
+    assert_equal "Zweite Version", de_translation.title
+    assert_operator de_translation.updated_at, :>, original_de_updated_at
+  end
+
+  test "clone_attributes_from removes a locale no longer present in the source" do
+    n = Node.root.children.create!(:slug => "clone_removed_locale_test")
+    source = n.draft
+    Globalize.with_locale(:en) { source.update!(:title => "English Title") }
+
+    target = Page.create!
+    target.clone_attributes_from(source)
+    assert_includes target.translations.map(&:locale), :en
+
+    source.translations.where(:locale => :en).delete_all
+    target.clone_attributes_from(source)
+
+    assert_not_includes target.reload.translations.map(&:locale), :en
+  end
+
   def test_diff_against_inline_keeps_tags_and_marks_only_the_changed_word
     n = Node.root.children.create! :slug => "diff_against_test"
     d = n.find_or_create_draft @user1
@@ -271,4 +321,53 @@ class PageTest < ActiveSupport::TestCase
     assert_equal [added_asset], diff[:assets][:added]
     assert_equal [removed_asset], diff[:assets][:removed]
   end
+
+  test "diff_against with an explicit locale compares that locale's own translation on each side" do
+    n = Node.root.children.create!(:slug => "diff_locale_test")
+    d = n.find_or_create_draft(@user1)
+    Globalize.with_locale(:en) { d.update!(:title => "Old English") }
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft(@user1)
+    Globalize.with_locale(:en) { d2.update!(:title => "New English") }
+    d2.save!
+
+    diff = d2.diff_against(n.head, :locale => :en)
+
+    assert_match "<del>Old</del>", diff[:title]
+    assert_match "<ins>New</ins>", diff[:title]
+  end
+
+  test "diff_against with an explicit locale ignores content in other locales entirely" do
+    n = Node.root.children.create!(:slug => "diff_locale_isolation_test")
+    d = n.find_or_create_draft(@user1)
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft(@user1)
+    Globalize.with_locale(:de) { d2.update!(:title => "Nur Deutsch geändert") }
+    d2.save!
+
+    diff = d2.diff_against(n.head, :locale => :en)
+
+    assert_no_match(/Deutsch/, diff[:title])
+  end
+
+  test "locale_diff_summary flags a locale that only exists on one side as changed" do
+    n = Node.root.children.create!(:slug => "diff_locale_summary_test")
+    d = n.find_or_create_draft(@user1)
+    d.save!
+    n.publish_draft!
+
+    d2 = n.find_or_create_draft(@user1)
+    Globalize.with_locale(:en) { d2.update!(:title => "New English translation") }
+    d2.save!
+
+    summary = d2.locale_diff_summary(n.head)
+    en_entry = summary.find { |s| s[:locale] == :en }
+
+    assert en_entry[:changed]
+    refute en_entry[:exists_there]
+  end
 end
-- 
cgit v1.3