convert: add a mode where mercurial_sink skips empty revisions.
The getchanges function of some converter_source classes can return
some false positives. I.e. they sometimes claim that a file "foo"
was changed in some revision, even though its contents are still the
same.
convert_svn is particularly bad, but I think this can also happen with
convert_cvs and, at least in theory, with mercurial_source.
For regular conversions this is not really a problem - as long as
getfile returns the right contents, we'll get a converted revision
with the right contents. But when we use --filemap, this could lead
to superfluous revisions being converted.
Instead of fixing every converter_source, I decided to change
mercurial_sink to work around this problem.
When --filemap is used, we're interested only in revisions that touch
some specific files. If a revision doesn't change any of these files,
then we're not interested in it (at least for revisions with a single
parent; merges are special).
For mercurial_sink, we abuse this property and rollback a commit if
the manifest text hasn't changed. This avoids duplicating the logic
from localrepo.filecommit to detect unchanged files.
#header#
<title>#repo|escape#: #file|escape# diff</title>
</head>
<body>
<div class="buttons">
<a href="#url#log/#rev#{sessionvars%urlparameter}">changelog</a>
<a href="#url#shortlog/#rev#{sessionvars%urlparameter}">shortlog</a>
<a href="#url#tags{sessionvars%urlparameter}">tags</a>
<a href="#url#rev/#node|short#{sessionvars%urlparameter}">changeset</a>
<a href="#url#file/#node|short#/#file|urlescape#{sessionvars%urlparameter}">file</a>
<a href="#url#log/#node|short#/#file|urlescape#{sessionvars%urlparameter}">revisions</a>
<a href="#url#annotate/#node|short#/#file|urlescape#{sessionvars%urlparameter}">annotate</a>
<a href="#url#raw-diff/#node|short#/#file|urlescape#">raw</a>
</div>
<h2>#file|escape#</h2>
<table id="filediffEntry">
<tr>
<th class="revision">revision #rev#:</th>
<td class="revision"><a href="#url#rev/#node|short#{sessionvars%urlparameter}">#node|short#</a></td>
</tr>
#parent%filediffparent#
#child%filediffchild#
</table>
<div id="fileDiff">
#diff#
</div>
#footer#