hgweb: display fate of obsolete changesets
Operations that obsolete changesets store enough metadata to explain what
happened after the fact. One way to get that metadata is showsuccsandmarkers
function, which returns a list of successors of a particular changeset and
appropriate obsolescence markers.
Templates have a set of experimental functions that have names starting with
obsfate. This patch uses some of these functions to interpret output of
succsandmarkers() and produce human-friendly messages that describe what
happened to an obsolete changeset, e.g. "pruned" or "rewritten as
6:3de5eca88c00".
In commonentry(), succsandmarkers property is made callable so it's only
executed on demand; this saves time when changeset is not obsolete, and also in
e.g. /shortlog view, where there are a lot of changesets, but we don't need to
show each and every one in detail.
In spartan theme, succsandmarkers is used instead of the simple "obsolete:
yes", in other themes a new line is added to /rev page.
<table class="logEntry parity{parity}">
<tr>
<th class="label"><span class="age">{date|rfc822date}</span>:</th>
<th class="firstline">{desc|strip|firstline|escape|nonempty}</th>
</tr>
<tr>
<th class="revision">changeset {rev}:</th>
<td class="node"><a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a></td>
</tr>
{parent%changelogparent}
{child%changelogchild}
{changelogtag}
<tr>
<th class="author">author:</th>
<td class="author">{author|obfuscate}</td>
</tr>
<tr>
<th class="date">date:</th>
<td class="date">{date|rfc822date}</td>
</tr>
{ifeq(phase, 'public', '', '<tr>
<th class="phase">phase:</th>
<td class="phase">{phase|escape}</td>
</tr>')}
{if(obsolete, '<tr>
<th class="obsolete">obsolete:</th>
<td class="obsolete">{succsandmarkers%obsfateentry}</td>
</tr>')}
{ifeq(count(instabilities), '0', '', '<tr>
<th class="instabilities">instabilities:</th>
<td class="instabilities">{instabilities%"{instability} "|escape}</td>
</tr>')}
<tr>
<th class="files"><a href="{url|urlescape}file/{node|short}{sessionvars%urlparameter}">files</a>:</th>
<td class="files">{files}</td>
</tr>
</table>