cat: add formatter support
This is an example showing how formatter can handle the --output option.
git subrepo isn't supported for now.
{header}
<title>Help: {topic}</title>
</head>
<body>
<div class="container">
<div class="menu">
<div class="logo">
<a href="{logourl}">
<img src="{staticurl|urlescape}{logoimg}" alt="mercurial" /></a>
</div>
<ul>
<li><a href="{url|urlescape}shortlog{sessionvars%urlparameter}">log</a></li>
<li><a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a></li>
<li><a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a></li>
<li><a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a></li>
<li><a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a></li>
</ul>
<ul>
<li class="active"><a href="{url|urlescape}help{sessionvars%urlparameter}">help</a></li>
</ul>
</div>
<div class="main">
<h2 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb}</h2>
<h3>Help: {topic}</h3>
<form class="search" action="{url|urlescape}log">
{sessionvars%hiddenformentry}
<p><input name="rev" id="search1" type="text" size="30" /></p>
<div id="hint">{searchhint}</div>
</form>
<div id="doc">
{rstdoc(doc, "html")}
</div>
</div>
</div>
{footer}