I just implemented this. There is one [[patch]] to the default page template, and a new plugin. -- [[Will]]
+> The use of sessioncgi here seems undesirable: on wikis where anonymity is
+> not allowed, you'll be asked to log in. Couldn't you achieve the same thing
+> by loading the index with IkiWiki::loadindex, like [[plugins/goto]] does?
+> --[[smcv]]
+
+[[!template id=gitbranch branch=smcv/getsource
+ author="[[Will]]/[[smcv]]"]]
+
+>> I've applied the patch below in a git branch, fixed my earlier criticism,
+>> and also fixed a couple of other issues I noticed:
+>>
+>> * missing pages could be presented better as a real 404 page
+>> * the default Content-type should probably be UTF-8 since the rest of
+>> IkiWiki tends to assume that
+>> * emitting attachments (images, etc.) as text/plain isn't going to work :-)
+>>
+>> Any opinions on my branch? I think it's ready for merge, if Joey approves.
+>>
+>> --[[smcv]]
+
+>>> That looks like a nice set of fixes. One more that might be worthwhile: instead of reading the page source into a var, and then writing it out later, it might be nice to just
+>>> `print readfile(srcfile(pagesources{$page}));` at the appropriate point. -- [[Will]]
+
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diff --git a/templates/page.tmpl b/templates/page.tmpl