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}: diff {file|escape}</title>
<link rel="alternate" type="application/atom+xml"
href="{url}atom-log" title="Atom feed for #repo|escape#">
<link rel="alternate" type="application/rss+xml"
href="{url}rss-log" title="RSS feed for {repo|escape}">
</head>
<body>
<div class="page_header">
<a href="http://www.selenic.com/mercurial/" title="Mercurial"><div style="float:right;">Mercurial</div></a><a href="{url}summary{sessionvars%urlparameter}">{repo|escape}</a> / diff
</div>
<div class="page_nav">
<a href="{url}summary{sessionvars%urlparameter}">summary</a> |
<a href="{url}shortlog{sessionvars%urlparameter}">shortlog</a> |
<a href="{url}log{sessionvars%urlparameter}">changelog</a> |
<a href="{url}tags{sessionvars%urlparameter}">tags</a> |
<a href="{url}file/{node|short}{path|urlescape}{sessionvars%urlparameter}">manifest</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> |
diff |
<a href="{url}raw-diff/{node|short}/{file|urlescape}">raw</a><br/>
</div>
<div class="title">{file|escape}</div>
<table>
<tr>
<td>changeset {rev}</td>
<td style="font-family:monospace"><a class="list" href="{url}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a></td></tr>
{parent%filediffparent}
{child%filediffchild}
</table>
<div class="list_head"></div>
<div class="page_body">
{diff}
</div>
{footer}