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[git.ikiwiki.info.git] / doc / plugins / contrib / album / discussion.mdwn

thanks for this plugin.  it might help me in my application, which is to provide album/galleries which can be edited (ie. new images added, taken away, etc.) through web interface.

> That's my goal eventually, too. Perhaps you can help to
> design/write this plugin? At the moment I'm mostly
> waiting for a design "sanity check" from [[Joey]],
> but any feedback you can provide on the design would
> also be helpful. --[[smcv]]

i have two challenges: firstly, for installation, i'm not sure what all the files are that need to be downloaded (because of my setup i can't easily pull the repo).  so far i have Ikiwiki/Plugins/album.pm; ikiwiki-album; and 4 files in templates/  any others?

> Those are all the added files; ikiwiki-album isn't strictly
> needed (IkiWiki itself doesn't use that code, but you can
> use it to turn a directory full of images into correct
> input for the album plugin).
>
> You probably also want the album plugin's expanded version of
> style.css (or put its extra rules in your local.css).
> Without that, your albums will be quite ugly.
>
> There aren't currently any other files modified by my branch.
> --[[smcv]]

secondly: barring the CGI interface for editing the album, which would be great, is there at least a way to use attachment plugin or any other to manually add images and then create viewers for them?

> Images are just attachments, and viewers are pages (any supported
> format, but .html will be fastest to render). Attach each image,
> then write a page for each image containing the
> \[[!albumimage]] directive (usually it will *only* contain that
> directive).
>
> The script ikiwiki-album can help you to do this in a git/svn/etc.
> tree; doing it over the web will be a lot of work (until I get
> the CGI interface written), but it should already be possible!
>
> The structure is something like this:
> 
> * album.mdwn (contains the \[[!album]] directive, and perhaps also
>   some \[[!albumsection]] directives)
> * album/a.jpg
> * album/a.html (contains the \[[!albumimage]] directive for a.jpg)
> * album/b.jpg
> * album/b.html (contains the \[[!albumimage]] directive for b.jpg)
>
> Have a look at ikiwiki-album to see how the directives are meant to
> work in practice.
>
> --[[smcv]]

>> In the current version of the branch, the viewer pages are
>> generated automatically if you didn't generate them yourself,
>> so `ikiwiki-album` is no longer needed. --[[smcv]]

i'm new to ikiwiki, apologies if this is dealt with elsewhere.  -brush

> This plugin is pretty ambitious, and is unfinished, so I'd recommend
> playing with  a normal IkiWiki installation for a bit, then trying
> out this plugin when you've mastered the basics of IkiWiki. --[[smcv]]

----

## design feedback from joeyh on an earlier version

You had wanted my feedback on the design of this. I have not looked at the
code or tried it yet, but here goes. --[[Joey]] 

* Needing to create the albumimage "viewer" pages for each photo
  seems like it will become a pain. Everyone will need to come up
  with their own automation for it, and then there's the question
  of how to automate it when uploading attachments. -J

> There's already a script (ikiwiki-album) to populate a git
> checkout with skeleton "viewer" pages; I was planning to make a
> specialized CGI interface for albums after getting feedback from
> you (since the requirements for that CGI interface change depending
> on the implementation). I agree that this is ugly, though. -s

>> Would you accept a version where the albumimage "viewer" pages
>> could be 0 bytes long, at least until metadata gets added?
>>
>> The more I think about the "binaries as first-class pages" approach,
>> the more subtle interactions I notice with other plugins. I
>> think I'm up to needing changes to editpage, comments, attachment
>> and recentchanges, plus adjustments to img and Render (to reduce
>> duplication when thumbnailing an image with a strange extension
>> while simultaneously changing the extension, and to hardlink/copy
>> an image with a strange extension to a differing target filename
>> with the normal extension, respectively). -s

>>> Now that we have `add_autofile` I can just create viewer pages
>>> whenever there's an image to view. The current version of the
>>> branch does that. -s

* With each viewer page having next/prev links, I can see how you
  were having the scalability issues with ikiwiki's data structures
  earlier! -J

> Yeah, I think they're a basic requirement from a UI point of view
> though (although they don't necessarily have to be full wikilinks).
> -s

>> I think that with the new dependency types system, the dependencies for
>> these can be presence dependencies, which will probably help with
>> avoiding rebuilds of a page if the next/prev page is changed.
>> (Unless you use img to make the thumbnails for those links, then it
>> would rebuild the thumbnails anyway. Have not looked at the code.) --[[Joey]]

>>> I do use img. -s

* And doesn't each viewer page really depend on every other page in the
  same albumsection? If a new page is added, the next/prev links
  may need to be updated, for example. If so, there will be much
  unnecessary rebuilding. -J

> albumsections are just a way to insert headings into the flow of
> photos, so they don't actually affect dependencies.
>
> One non-obvious constraint of ikiwiki's current design is that
> everything "off-page" necessary to build any page has to happen
> at scan time, which has caused a few strange design decisions,
> like the fact that each viewer controls what album it's in.
>
> It's difficult for the contents of the album to just be a
> pagespec, like for inline, because pagespecs can depend on
> metadata, which is gathered in arbitrary order at scan time;
> so the earliest you can safely apply a pagespec to the wiki
> contents to get a concrete list of pages is at rebuild time.
>
> (This stalled my attempt at a trail plugin, too.) -s

>> Not sure I understand why these need to look at pagespecs at scan time?
>> Also, note that it is fairly doable to detect if a pagespec uses such
>> metadata. Er, I mean, I have a cheezy hack in `add_depends` now that does
>> it to deal with a similar case. --[[Joey]] 

>>> I think I was misunderstanding how early you have to call `add_depends`?
>>> The critical thing I missed was that if you're scanning a page, you're
>>> going to rebuild it in a moment anyway, so it doesn't matter if you
>>> have no idea what it depends on until the rebuild phase. -s

* One thing I do like about having individual pages per image is
  that they can each have their own comments, etc. -J

> Yes; also, they can be wikilinked. I consider those to be
> UI requirements. -s

* Seems possibly backwards that the albumimage controls what album
  an image appears in. Two use cases -- 1: I may want to make a locked
  album, but then anyone who can write to any other page on the wiki can
  add an image to it. 2: I may want an image to appear in more than one
  album. Think tags. So it seems it would be better to have the album
  directive control what pages it includes (a la inline). -J

> I'm inclined to fix this by constraining images to be subpages of exactly
> one album: if they're subpages of 2+ nested albums then they're only
> considered to be in the deepest-nested one (i.e. longest URL), and if
> they're not in any album then that's a usage error. This would
> also make prev/next links sane. -s

>> The current version constrains images to be in at most one album,
>> choosing one arbitrarily (dependent on scan order) if albums are
>> nested. -s

> If you want to reference images from elsewhere in the wiki and display
> them as if in an album, then you can use an ordinary inline with
> the same template that the album would use, and I'll make sure the
> templates are set up so this works. -s

>> Still needs documenting, I've put it on the TODO list on the main
>> page. -s

> (Implementation detail: this means that an image X/Y/Z/W/V, where X and
> Y are albums, Z does not exist and W exists but is not an album,
> would have a content dependency on Y, a presence dependency on Z
> and a content dependency on W.)
>
> Perhaps I should just restrict to having the album images be direct
> subpages of the album, although that would mean breaking some URLs
> on the existing website I'm doing all this work for... -s

>> The current version of the branch doesn't have this restriction;
>> perhaps it's a worthwhile simplification, or perhaps it's too
>> restrictive? I fairly often use directory hierarchies like
>> `a_festival/saturday/foo.jpg` within an album, which makes
>> it very easy to write `albumsection` filters. -s

* Putting a few of the above thoughts together, my ideal album system
  seems to be one where I can just drop the images into a directory and
  have them appear in the album index, as well as each generate their own wiki
  page. Plus some way I can, later, edit metadata for captions,
  etc. (Real pity we can't just put arbitrary metadata into the images
  themselves.) This is almost pointing toward making the images first-class
  wiki page sources. Hey, it worked for po! :) But the metadata and editing
  problems probably don't really allow that. -J

> Putting a JPEG in the web form is not an option from my point of
> view :-) but perhaps there could just be a "web-editable" flag supplied
> by plugins, and things could be changed to respect it.

>> Replying to myself: would you accept patches to support
>> `hook(type => 'htmlize', editable => 0, ...)` in editpage? This would
>> essentially mean "this is an opaque binary: you can delete it
>> or rename it, and it might have its own special editing UI, but you
>> can never get it in a web form".
>>
>> On the other hand, that essentially means we need to reimplement
>> editpage in order to edit the sidecar files that contain the metadata.
>> Having already done one partial reimplementation of editpage (for
>> comments) I'm in no hurry to do another.
>>
>> I suppose another possibility would be to register hook
>> functions to be called by editpage when it loads and saves the
>> file. In this case, the loading hook would be to discard
>> the binary and use filter() instead, and the saving conversion
>> would be to write the edited content into the metadata sidecar
>> (creating it if necessary).
>>
>> I'd also need to make editpage (and also comments!) not allow the
>> creation of a file of type albumjpg, albumgif etc., which is something
>> I previously missed; and I'd need to make attachment able to
>> upload-and-rename.
>> -s

>>> I believe the current branch meets your requirements, by having
>>> first-class wiki pages spring into existence using `add_autofile`
>>> to be viewer pages for photos. -s

> In a way, what you really want for metadata is to have it in the album
> page, so you can batch-edit the whole lot by editing one file (this
> does mean that editing the album necessarily causes each of its viewers
> to be rebuilt, but in practice that happens anyway). -s

>> Replying to myself: in practice that *doesn't* happen anyway. Having
>> the metadata in the album page is somewhat harmful because it means
>> that changing the title of one image causes every viewer in the album
>> to be rebuilt, whereas if you have a metadata file per image, only
>> the album itself, plus the next and previous viewers, need
>> rebuilding. So, I think a file per image is the way to go.
>>
>> Ideally we'd have some way to "batch-edit" the metadata of all
>> images in an album at once, except that would make conflict
>> resolution much more complicated to deal with; maybe just
>> give up and scream about mid-air collisions in that case?
>> (That's apparently good enough for Bugzilla, but not really
>> for ikiwiki). -s

>>> This is now in the main page's TODO list; if/when I implement this,
>>> I intend to make it a specialized CGI interface. -s

>> Yes, [all metadata in one file] would make some sense.. It also allows putting one image in
>> two albums, with different caption etc. (Maybe for different audiences.)
>> --[[Joey]]

>>> Eek. No, that's not what I had in mind at all; the metadata ends up
>>> in the "viewer" page, so it's necessarily the same for all albums. -s

>> It would probably be possible to add a new dependency type, and thus
>> make ikiwiki smart about noticing whether the metadata has actually
>> changed, and only update those viewers where it has. But the dependency
>> type stuff is still very new, and not plugin friendly .. so only just
>> possible, --[[Joey]] 

----

## alternative "special extension" design (conclusion: "don't")

'''I think the "special extension" design is a dead-end, but here's what
happened when I tried to work out how it would work. --[[smcv]]'''

Suppose that each viewer is a JPEG-or-GIF-or-something, with extension
".albumimage". We have a gallery "memes" with three images, badger,
mushroom and snake.

> An alternative might be to use ".album.jpg", and ".album.gif"
> etc as the htmlize extensions. May need some fixes to ikiwiki to support
> that. --[[Joey]] 

>> foo.albumjpg (etc.) for images, and foo._albummeta (with
>> `keepextension => 1`) for sidecar metadata files, seems viable. -s

Files in git repo:

* index.mdwn
* memes.mdwn
* memes/badger.albumjpg (a renamed JPEG)
* memes/badger/comment_1._comment
* memes/badger/comment_2._comment
* memes/mushroom.albumgif (a renamed GIF)
* memes/mushroom._albummeta (sidecar file with metadata)
* memes/snake.albummov (a renamed video)

Files in web content:

* index.html
* memes/index.html
* memes/96x96-badger.jpg (from img)
* memes/96x96-mushroom.gif (from img)
* memes/96x96-snake.jpg (from img, hacked up to use totem-video-thumbnailer :-) )
* memes/badger/index.html (including comments)
* memes/badger.jpg
* memes/mushroom/index.html
* memes/mushroom.gif
* memes/snake/index.html
* memes/snake.mov

ispage("memes/badger") (etc.) must be true, to make the above rendering
happen, so albumimage needs to be a "page" extension.

To not confuse other plugins, album should probably have a filter() hook
that turns .albumimage files into HTML? That'd probably be a reasonable
way to get them rendered anyway.

> I guess that is needed to avoid preprocess, scan, etc trying to process
> the image, as well as eg, smiley trying to munge it in sanitize.
> --[[Joey]] 

>> As long as nothing has a filter() hook that assumes it's already
>> text... filters are run in arbitrary order. We seem to be OK so far
>> though.
>>
>> If this is the route I take, I propose to have the result of filter()
>> be the contents of the sidecar metadata file (empty string if none),
>> with the `\[[!albumimage]]` directive (which no longer requires
>> arguments) prepended if not already present. This would mean that
>> meta directives in the metadata file would work as normal, and it
>> would be possible to insert text both before and after the viewer
>> if desired. The result of filter() would also be a sensible starting
>> point for editing, and the result of editing could be diverted into
>> the metadata file. -s

do=edit&page=memes/badger needs to not put the JPG in a text box: somehow
divert or override the normal edit CGI by telling it that .albumimage
files are not editable in the usual way?

> Something I missed here is that editpage also needs to be told that
> creating new files of type albumjpg, albumgif etc. is not allowed
> either! -s

Every image needs to depend on, and link to, the next and previous images,
which is a bit tricky. In previous thinking about this I'd been applying
the overly strict constraint that the ordered sequence of pages in each
album must be known at scan time. However, that's not *necessarily* needed:
the album and each photo could collect an unordered superset of dependencies
at scan time, and at rebuild time that could be refined to be the exact set,
in order.

> Why do you need to collect this info at scan time? You can determine it
> at build time via `pagespec_match_list`, surely .. maybe with some
> memoization to avoid each image in an album building the same list.
> I sense that I may be missing a subtelty though. --[[Joey]] 

>> I think I was misunderstanding how early you have to call `add_depends`
>> as mentioned above. -s

Perhaps restricting to "the images in an album A must match A/*"
would be useful; then the unordered superset could just be "A/*". Your
"albums via tags" idea would be nice too though, particularly for feature
parity with e.g. Facebook: "photos of Joey" -> "tags/joey and albumimage()"
maybe?

If images are allowed to be considered to be part of more than one album,
then a pretty and usable UI becomes harder - "next/previous" expands into
"next photo in holidays/2009/germany / next photo in tagged/smcv / ..."
and it could get quite hard to navigate. Perhaps next/previous links could
be displayed only for the closest ancestor (in URL space) that is an
album, or something?

> Ugh, yeah, that is a problem. Perhaps wanting to support that was just
> too ambitious. --[[Joey]] 

>> I propose to restrict to having images be subpages of albums, as
>> described above. -s

Requiring renaming is awkward for non-technical Windows/Mac users, with both
platforms' defaults being to hide extensions; however, this could be
circumvented by adding some sort of hook in attachment to turn things into
a .albumimage at upload time, and declaring that using git/svn/... without
extensions visible is a "don't do that then" situation :-)

> Or extend `pagetype` so it can do the necessary matching without
> renaming. Maybe by allowing a subdirectory to be specified along
> with an extension. (Or allow specifying a full pagespec,
> but I hesitate to seriously suggest that.) --[[Joey]] 

>> I think that might be a terrifying idea for another day. If we can
>> mutate the extension during the `attach` upload, that'd be enough;
>> I don't think people who are skilled enough to use git/svn/...,
>> but not skilled enough to tell Explorer to show file extensions,
>> represent a major use case. -s

Ideally attachment could also be configured to upload into a specified
underlay, so that photos don't have to be in your source-code control
(you might want that, but I don't!).

> Replying to myself: perhaps best done as an orthogonal extension
> to attach? -s

> Yet another non-obvious thing this design would need to do is to find
> some way to have each change to memes/badger._albummeta show up as a
> change to memes/badger in `recentchanges`. -s

Things that would be nice, and are probably possible:

* make the "Edit page" link on viewers divert to album-specific CGI instead
  of just failing or not appearing (probably possible via pagetemplate)

* some way to deep-link to memes/badger.jpg with a wikilink, without knowing a
  priori that it's secretly a JPEG (probably harder than it looks - you'd
  have to make a directive for it and it's probably not worth it)

----

## bug: unable to vary thumbnail size

Hi smcv, great plugin. I am an ikiwiki newbie but so far I've had success using your plugin.
I've integrated the jquery masonry plugin into the albumitem template and it works great.
But is there a way to create thumnails of different sizes? I've passed thumnailsize option
and value to album directive and while it does create the new thumbnail sizes it doesn't use them,
The 96x96 thumbnails still appear on the page no matter what I do. - jaime

> [[KathrynAndersen]] fixed this, see below. --[[smcv]]

----

## failed installation

Hi, the plugin looks great, but I am probably too dumb to use it ;( here is what I did:
created page gal.mdwn with just \[\[!album\]\] directive (no arguments) and subdirectory gal/ with images in form img_1234.jpg

when I run ikiwiki, I get something completely wrong though:

generated gal/index.html page contains following code repeated for every image:

    <div class="album-viewer">
      <div id="album-img">
        <div class="album-finish">
          <a href="./"><span class="album-arrow">↑</span></a>
        </div>
      </div>
    </div>

So no links to any images, etc.

The pages for individual images are generated though, but also not correct. Trails section is perfect, but the main part is wrong:

    <div class="album-prev">
      <a><span class="album-arrow">â†<90></span></a><br />
      <div class="album-thumbnail">
        <span class="selflink">
          <img src="./96x96-img_2913.jpg" width="96" height="72" alt="img 2913" title="img 2913" class="img" /></span>
      </div>
    </div>

This really seems like this should be in the album page and not individul page. It is only thumbnail and not full image. Also the full image is not in the generated html tree at all!

I am using ikiwiki 3.20130518, and got the album sources from the links of [this page](http://ikiwiki.info/plugins/contrib/album/) (part manual installation)

Any hint about what do I do wrong?

Thanks Lukas

> This plugin is not really finished. I probably need to update it for
> current ikiwiki. I'll try to update it (and also update my demo
> and installation instructions) at some point. --[[smcv]]

>> I have to appologize, I accidentally copied the template wrongly and that caused all the issues ;(
>> So now after two days debugging and tracing, I just fixed that and it works. Well, at least a learnt
>> a lot about ikiwiki internal ;-)
>> Thanks for all the work you did on the plugin! --Lukas

----

## bug + patch: not all images shown on album page

Hi smcv, we spoke on irc the other day. Passed `show => "0"` on line 126 in album.pm to remove the limit on the thumbnails shown on the album page. Setting it on the album directive didn't work.

--kjs

> That sounds like a correct solution. I'll fix that in my branch when I work on
> this again. --[[smcv]]

----

## bug: thumbnailsize doesn't work

As mentioned above by Jaime setting the thumbnailsize doesn't catch either. Or rather if I git push after changing the album directive the generated thumbnails (the image files) are the correct size as set in the directive. The html however uses the default thumbnailsize as hardcoded in album.pm and has broken thumbnails as it links to a file with the default size in the filename.

> [[KathrynAndersen]] fixed this, see below. --[[smcv]]

Issuing `ikiwiki --rebuild` knocks the system into another gear where the thumbnails show up correctly but this is only due to the html being the same as above (linking to hardcoded thumbnailsize) but the generated thumbnail images are now matching the hardcoded size ignoring the thumbnailsize attribute on the album directive.

For me this behaviour is way beyond my skills to sort out (I'm no coder). The albumplugin ikiwiki combo is very attractive to me and the plugin i soo close to working!

--kjs

----

## wishlist + patch: make clicking on the large image go to the next

I've changed the behavior of the "slideshow" to show the next image when clicking the large image as downloading a full resolution image is a rare use case in a gallery of this type imho. The large clicktarget means you are likely to unnecessarily download large files otherwise. I can't quite follow the template, album.pm flow so I can't figure out how to put a "download full resolution" link on the viewer page which would be my next step. To achieve the next link i added ` link => ($nextpage or $album),` around line 454 in `my $img`

--kjs

> That seems reasonable. I'll consider that when I work on this
> plugin again next. --[[smcv]]

----

## wishlist from kjs

My wishlist for the plugin would include:

- Reading exif info from the imagefile
- ~~Keeping the full resolution image files out of version control~~ Solved this by simply creating a underlay for the images. Works out of the box for my non cgi workflow.
- Being able to create new albums by tag or by manually picking images from other albums. Could be a simple comma separated list of viewer names, or even full urls, in the album directive.
- A counter showing **current image/total number of images in album**. This would mean that you know how many images you have left to click through before you have seen all images in an album. This gives you enought info to decide weather to click through or go back/leave.

--kjs

> I want the first two of those too, perhaps one day I'll get round to
> implementing them.
>
> For the third, you can get the same practical effect using an inline
> as documented in the main page. --[[smcv]]
>> The downside to current behaviour is that clicking an inlined thumbnail will take you to the original album context. Previous/Next image will not match the thumbnails in the inline but the thumbnails in the album. This is a bit confusing for users and prevents using the image in multiple contexts without duplicating the image. To achieve what I'm looking for there would have to be several AlbumViewer pages for a single image. --kjs

----

## suggested fix for thumbnail size bug

I've tracked down the "always showing the 96x96 thumbnails" bug!

The problem is in the pagetemplate function, which calls "thumbnail" to determine the name of the thumbnail image to use. As you know, the "img" method of generating thumbnails includes the size of the thumbnail as part of its name (to ensure that resizing thumbnails will create a new file of the correct size). The problem is... that in the pagetemplate function, the thumbnailsize is NOT passed in to the call to "thumbnail", so it always returns the default size, 96x96. Hence nothing that anyone can do will change the thumbnails to anything else. Oh, the different-sized thumbnail images ARE created, but they're never linked to.

Here's a context-diff of my fix:

<pre>
*** /home/kat/files/repos/ikiwiki_smcv/IkiWiki/Plugin/album.pm  2013-12-18 14:50:06.861623226 +1100
--- album.pm    2013-12-18 15:51:09.393582879 +1100
***************
*** 484,489 ****
--- 484,490 ----
                my $viewer = $params{page};
                my $album = $pagestate{$viewer}{album}{album};
                my $image = $pagestate{$viewer}{album}{image};
+                 my $thumbnailsize = $pagestate{$album}{album}{thumbnailsize};
  
                return unless defined $album;
                return unless defined $image;
***************
*** 495,501 ****
  
                if ($template->query(name => 'thumbnail')) {
                        $template->param(thumbnail =>
!                               thumbnail($viewer, $params{destpage}));
                }
                if (IkiWiki::isinlinableimage($image)
                        && ($template->query(name => 'imagewidth') ||
--- 496,502 ----
  
                if ($template->query(name => 'thumbnail')) {
                        $template->param(thumbnail =>
!                               thumbnail($viewer, $params{destpage}, $thumbnailsize));
                }
                if (IkiWiki::isinlinableimage($image)
                        && ($template->query(name => 'imagewidth') ||
</pre>

-- [[KathrynAndersen]]

> I haven't tried this change, but it seems sane. I'll apply it
> when I next work on this plugin.
>
> (OOI: why not a unified diff? The VCS world seems to have
> settled on those as universal, and I find them easier to
> read.)
>
> --[[smcv]]

----

## bug: inability to show more than 10 items

I've found another bug. The album plugin doesn't allow one to have more than 10 items in an album section. This is because it uses "inline" to display album sections, and the default for inline is to show only 10 items. So it only shows 10 items.

What would be good is if the album directive could have a "show" parameter which is passed on to preprocess_inline, so that users could decide how many items to show (including ALL of them, if they give show=0).

-- [[KathrynAndersen]]

> My intention was that all items would always be shown, so I would always pass
> `show => 0` to `preprocess_inline` (as kjs suggested above), but that must have
> got lost somewhere. I'll apply it next time I work on this plugin.
>
> An optional `show` parameter would be a possible enhancement beyond that,
> although I don't know how useful it would be; if it isn't passed, the
> default should be 0 (unlimited). --[[smcv]]