<!--!
       changes   - a list of diff items, each being a dict containing informations about
                   changes for one file:
                     .href         - link for the title (optional)
                     .title        - tooltip for the title link (optional)
                     .comments     - annotation for the change (optional)
                     .new and .old - information about the files being diffed
                       .path         - path of the file
                       .rev          - rev of the file (for 'sidebyside')
                       .shortrev     - abbreviated form of rev of the file (for 'inline')
                       .href         - link to the full file (optional)
                     .props        - a list of property changes
                       .name         - name of the property
                       .diff         - rendered difference
                       .old          - old value of the property
                       .new          - new value for the property
                       (both .old and .new have .name, .value and .rendered properties)
                     .diffs        - a sequence of list of blocks
                     
                       Each block being a dict:
                       .type         - one of 'unmod', 'add', 'rem' or 'mod'
                       .base and .changed - informations about lines from old and new content
                         .lines              - the lines
                         .offset             - position within the file

                     .diffs_title  - a sequence of titles for the list of blocks
                                     Note: integrate this into .diffs for 0.12 or 0.13.

       diff      - dict specifying diff style and options
                     .style     - can be 'sidebyside' (4 columns) or 'inline' (3 columns)
                     .options   - contexlines, various ignore...

       longcol  - "long" column header; e.g. 'Revision' or 'File' or '' (for 'sidebyside')
       shortcol - "short" column header: e.g. 'r' or '' (for 'inline')
       no_id    - skip generation of id attributes in h2 headings

-->
<div xmlns="http://www.w3.org/1999/xhtml"
      xmlns:py="http://genshi.edgewall.org/"
      xmlns:xi="http://www.w3.org/2001/XInclude"
      class="diff">

  <ul py:if="any([item.diffs or item.props for item in changes])" class="entries">
    <py:for each="idx, item in enumerate(changes)">
      <li py:if="item and (item.diffs or item.props or 'comments' in item)" class="entry" py:with="comments = item.get('comments')">
        <h2 id="${not no_id and 'file%s' % idx or None}" py:choose="">
          <a py:when="item.new.path" title="${item.get('title', item.new.get('title'))}"
             href="${item.get('href', item.new.get('href'))}">$item.new.path</a>
          <py:otherwise>&nbsp;</py:otherwise>
        </h2>
        <pre py:if="comments">$comments</pre>
        <ul py:if="item.props" class="props">
          <py:for each="prop in item.props" py:choose="">
            <py:when test="prop.diff">$prop.diff</py:when>
            <py:with vars="one = prop.old or prop.new;
                           both = prop.old and prop.new;
                           action = both and 'changed from ' or not prop.old and 'set' or 'deleted'">
              <li py:when="one">
                Property <strong py:attrs="one.rendered and one.rendered.name_attributes">
                  ${one.rendered and one.rendered.name or prop.name}</strong> $action
                <py:def function="render_property(prop)">
                  <py:choose>
                    <py:when test="prop.rendered">$prop.rendered.content</py:when>
                    <em py:when="istext(prop.value)"><tt>$prop.value</tt></em>
                    <py:otherwise>$prop.value</py:otherwise>
                  </py:choose>
                </py:def>
                <py:if test="prop.old and prop.new">${render_property(prop.old)}</py:if>
                <py:if test="prop.new"> to ${render_property(prop.new)}</py:if>
              </li>
            </py:with>
          </py:for>
        </ul>
        <table py:if="item.diffs" class="trac-diff $diff.style" summary="Differences" cellspacing="0"
               py:with="fromline = item.diffs[0][0].base.offset+1;
                        toline = item.diffs[0][0].changed.offset+1">
          <py:choose test="diff.style">
            <py:when test="'sidebyside'">
              <colgroup class="l"><col class="lineno" /><col class="content" /></colgroup>
              <colgroup class="r"><col class="lineno" /><col class="content" /></colgroup>
              <thead>
                <tr>
                  <th colspan="2">
                    <a title="${item.old.get('title')}" href="${item.old.get('href')}#L$fromline"
                       py:strip="'href' not in item.old">$longcol $item.old.rev</a>
                  </th>
                  <th colspan="2">
                    <a title="${item.new.get('title')}" href="${item.new.get('href')}#L$toline"
                       py:strip="'href' not in item.new">$longcol $item.new.rev</a>
                  </th>
                </tr>
              </thead>
            </py:when>
            <py:when test="'inline'">
              <colgroup><col class="lineno" /><col class="lineno" /><col class="content" /></colgroup>
              <thead>
                <tr>
                  <th title="$longcol $item.old.rev">
                    <a title="${item.old.get('title')}" href="${item.old.get('href')}#L$fromline"
                       py:strip="'href' not in item.old">
                      $shortcol$item.old.shortrev</a>
                  </th>
                  <th title="$longcol $item.new.rev">
                    <a title="${item.new.get('title')}" href="${item.new.get('href')}#L$toline"
                       py:strip="'href' not in item.new">
                      $shortcol$item.new.shortrev</a>
                  </th>
                  <td><em py:if="'diffs_title' in item">${item.diffs_title[0]}</em>&nbsp;</td>
                </tr>
              </thead>
            </py:when>
          </py:choose>
          <py:for each="idx, blocks in enumerate(item.diffs)">
            <tbody py:for="block in blocks" class="$block.type">
              <py:choose test="block.type">

                <py:when test="'unmod'"> <!--! Show identical lines on both "sides" -->
                  <tr py:for="idx, line in enumerate(block.base.lines)">
                      <py:with vars="from_n = block.base.offset+idx+1; to_n = block.changed.offset+idx+1;
                                     clines = block.changed.lines">
                      <py:choose test="diff.style">
                        <py:when test="'sidebyside'">
                          <th>$from_n</th><td class="l"><span>$line</span>&nbsp;</td>
                          <th>$to_n</th><td class="r"><span>${idx &lt; len(clines) and clines[idx] or ''}</span>&nbsp;</td>
                        </py:when>
                        <py:when test="'inline'">
                          <th>$from_n</th><th>$to_n</th><td class="l"><span>$line</span>&nbsp;</td>
                        </py:when>
                      </py:choose>
                    </py:with>
                  </tr>
                </py:when>

                <py:when test="'add'"> <!--! Show only added lines, on the "right side" -->
                  <tr py:for="idx, line in enumerate(block.changed.lines)"
                    class="${diff.style == 'inline' and first_last(idx, block.changed.lines) or None}">
                    <py:with vars="to_n = block.changed.offset+idx+1">
                      <py:choose test="diff.style">
                        <py:when test="'sidebyside'">
                          <th>&nbsp;</th><td class="l">&nbsp;</td>
                          <th>$to_n</th><td class="r"><ins>$line</ins>&nbsp;</td>
                        </py:when>
                        <py:when test="'inline'">
                          <th>&nbsp;</th><th>$to_n</th><td class="r"><ins>$line</ins>&nbsp;</td>
                        </py:when>
                      </py:choose>
                    </py:with>
                  </tr>
                </py:when>

                <py:when test="'rem'"> <!--! Show only deleted lines, on the "left side" -->
                  <tr py:for="idx, line in enumerate(block.base.lines)"
                    class="${diff.style == 'inline' and first_last(idx, block.base.lines) or None}">
                    <py:with vars="from_n = block.base.offset+idx+1">
                      <py:choose test="diff.style">
                        <py:when test="'sidebyside'">
                          <th>$from_n</th><td class="l"><del>$line</del>&nbsp;</td>
                          <th>&nbsp;</th><td class="r">&nbsp;</td>
                        </py:when>
                        <py:when test="'inline'">
                          <th>$from_n</th><th>&nbsp;</th><td class="l"><del>$line</del>&nbsp;</td>
                        </py:when>
                      </py:choose>
                    </py:with>
                  </tr>
                </py:when>

                <py:when test="'mod'"> <!--! Show edited lines, on both "sides" -->
                  <py:choose test="diff.style">
                    <py:when test="'sidebyside'">
                      <py:choose>
                        <py:when test="len(block.base.lines) &gt;= len(block.changed.lines)">
                          <tr py:for="idx, line in enumerate(block.base.lines)">
                            <th>${block.base.offset+idx+1}</th>
                            <td class="l"><span>$line</span>&nbsp;</td>
                            <py:with vars="within_change = idx &lt; len(block.changed.lines)">
                              <th>${within_change and block.changed.offset+idx+1 or '&nbsp;'}</th>
                              <td class="r"><span py:if="within_change">${block.changed.lines[idx]}</span>&nbsp;</td>
                            </py:with>
                          </tr>
                        </py:when>
                        <py:otherwise> <!--! there are more changed lines than original lines -->
                          <tr py:for="idx, line in enumerate(block.changed.lines)">
                            <py:with vars="within_change = idx &lt; len(block.base.lines)">
                              <th>${within_change and block.base.offset+idx+1 or '&nbsp;'}</th>
                              <td class="l"><span py:if="within_change">${block.base.lines[idx]}</span>&nbsp;</td>
                            </py:with>
                            <th>${block.changed.offset+idx+1}</th>
                            <td class="r"><span>$line</span>&nbsp;</td>
                          </tr>
                        </py:otherwise>
                      </py:choose>
                    </py:when>
                    <py:when test="'inline'">
                      <!--! First show the "old" lines -->
                      <tr py:for="idx, line in enumerate(block.base.lines)"
                        class="${idx == 0 and 'first' or None}">
                        <th>${block.base.offset+idx+1}</th><th>&nbsp;</th><td class="l"><span>$line</span>&nbsp;</td>
                      </tr>
                      <!--! Then show the "new" lines -->
                      <tr py:for="idx, line in enumerate(block.changed.lines)"
                        class="${idx + 1 == len(block.changed.lines) and 'last' or None}">
                        <th>&nbsp;</th><th>${block.changed.offset+idx+1}</th><td class="r"><span>$line</span>&nbsp;</td>
                      </tr>
                    </py:when>
                  </py:choose>
                </py:when>

              </py:choose>
            </tbody>
            <py:if test="idx &lt; len(item.diffs) - 1">
              <tbody class="skipped" py:choose="diff.style"
                py:with="fromline = item.diffs[idx+1][0].base.offset+1;
                         toline = item.diffs[idx+1][0].changed.offset+1">
                <tr py:when="'sidebyside'">
                  <th><a href="$item.old.href#L$fromline">&hellip;</a></th><td>&nbsp;</td>
                  <th><a href="$item.new.href#L$toline">&hellip;</a></th><td>&nbsp;</td>
                </tr>
                <tr py:when="'inline'">
                  <th><a href="$item.old.href#L$fromline">&hellip;</a></th>
                  <th><a href="$item.new.href#L$toline">&hellip;</a></th>
                  <td><em py:if="'diffs_title' in item">${item.diffs_title[idx+1]}</em>&nbsp;</td>
                </tr>
              </tbody>
            </py:if>
          </py:for>
        </table>
      </li>
    </py:for>
  </ul>

</div>
