One refinement I'd suggest is that if the transient page is edited,
its transient contents are evaluated and used as the initial
content for the edit box; after that, it'd become a static page. --[[smcv]]
+
+--------------------------
+
+[[!template id=gitbranch branch=smcv/transient author="[[smcv]]"]]
+[[!tag patch]]
+
+I had a look at implementing this. It turns out to be harder than I thought
+to have purely in-memory pages (several plugins want to be able to access the
+source file as a file), but I did get this proof-of-concept branch
+to write tag and autoindex pages into an underlay.
+
+This loses the ability to delete the auto-created pages (although they don't
+clutter up git this way, at least), and a lot of the code in autoindex is
+probably now redundant, so this is probably not quite ready for merge, but
+I'd welcome opinions.
+
+Usage: set `tag_underlay` and/or `autoindex_underlay` to an absolute path,
+which you must create beforehand. I suggest *srcdir* + `/.ikiwiki/transient`.
+
+Refinements that could be made if this approach seems reasonable:
+
+* make these options boolean, and have the path always be `.ikiwiki/transient`
+* improve the `remove` plugin so it also deletes from this special underlay
+
+>> Perhaps it should be something more generic, so that other plugins could use it (such as "album" mentioned above).
+>> The `.ikiwiki/transient` would suit this, but instead of saying "tag_underlay" or "autoindex_underlay" have "use_transient_underlay" or something like that?
+>> Or to make it more flexible, have just one option "transient_underlay" which is set to an absolute path, and if it is set, then one is using a transient-underlay.
+>> --[[KathrynAndersen]]
+
+>>> What I had in mind was more like `tag_autocreate_transient => 1` or
+>>> `autoindex_transient => 1`; you might conceivably want tags to be
+>>> checked in but autoindices to be transient, and it's fine for each
+>>> plugin to make its own decision. Going from that to one boolean
+>>> (or just always-transient if people don't think that's too
+>>> astonishing) would be trivial, though.
+>>>
+>>> I don't think relocating the transient underlay really makes sense,
+>>> except for prototyping: you only want one, and `.ikiwiki` is as good
+>>> a place as any (ikiwiki already needs to be able to write there).
+>>>
+>>> For [[plugins/contrib/album]] I think I'd just make the photo viewer
+>>> pages always-transient - you can always make a transient page
+>>> permanent by editing it, after all.
+>>>
+>>> Do you think this approach has enough potential that I should
+>>> continue to hack on it? Any thoughts on the implementation? --[[smcv]]