X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/75f762014bbb2bef19b443e2f6617692efdbda87..4c88a4d9d8fb62e8e4bea068a2546059bd1fa306:/doc/todo/fancypodcast.mdwn diff --git a/doc/todo/fancypodcast.mdwn b/doc/todo/fancypodcast.mdwn index 9291b9626..79b214049 100644 --- a/doc/todo/fancypodcast.mdwn +++ b/doc/todo/fancypodcast.mdwn @@ -5,6 +5,35 @@ also have lots more metadata. [[!toc]] +## Status + +[[!template id=gitbranch branch=schmonz/fancypodcast author="[[schmonz]]"]] +[[!tag patch]] + +In summary, the branch preserves ikiwiki's existing podcast behavior, +adds more featureful behavior, and has been tested to work well in +some common podcatchers. I believe it is ready for integration. +--[[schmonz]] + +## Features + +[[!table data=""" +Feature |iTunes RSS|iTunes Atom|Downcast RSS|Downcast Atom +Feed image | | | | +Feed title |(./) |(./) |(./) |(./) +Feed publisher | | | | +Feed "category" | | | | +Feed date |(./) |(./) |(./) |(./) +Feed description |(./) |(./) |(./) | +Episode image | | | | +Episode title |(./) |(./) |(./) |(./) +Episode date |(./) |(./) |(./) |(./) +Episode duration | | | | +Episode author | | | | +Episode description|(./) |(./) |(./) | +Episode enclosure |(./) |(./) |(./) |(./) +"""]] + ## Design 7. For each fancy podcast episode, write a blog post containing @@ -18,8 +47,6 @@ also have lots more metadata. ## Implementation -[[!template id=gitbranch branch=schmonz/fancypodcast author="[[schmonz]]"]] - ### Completed * Cover the existing simple podcast behavior with tests. @@ -32,50 +59,290 @@ also have lots more metadata. to `{,inline}page.tmpl`. * Write failing tests for the desired RSS/Atom behavior, then make them pass via changes to `{atom,rss}item.tmpl` and [[plugins/inline]]. +* Match feature-for-feature with + [tru_podcast](http://www.rainskit.com/blog/542/tru_podcast-a-podcasting-plugin-for-textpattern) + (what [[schmonz]] will be migrating from). +* Enrich [feed metadata](http://cyber.law.harvard.edu/rss/rss.html) + by catching up `rsspage.tmpl` to `atompage.tmpl`. +* Verify that [[plugins/more]] plays well with fancy podcasts. +* Verify that the feeds validate. +* Subscribe to a fancy feed in some common podcatchers and verify + display details against a reference podcast. +* Verify smooth transitions for two common use cases (see testing + details below). +* Code review: don't add enclosure divs unless we have enclosures. +* Code review: genericize download link for more use cases. +* Code review: don't confuse old readers with Atom names in RSS. +* Code review: instead of hacking back to `$link`, just provide it. +* Code review: show author in addition to feedname, if different. ### Must-have (for [[schmonz]], anyway) -* Enrich podcast feed metadata (some of which is iTunes-specific, - though I'm not aware of it causing any problems for other - podcatchers, and in fact some of them may also use it). -* Subscribe to a fancy feed in some common podcatchers and compare - display details against a reference podcast. -* Compare feature-for-feature and feed-for-feed with - [tru_podcast](http://www.rainskit.com/blog/542/tru_podcast-a-podcasting-plugin-for-textpattern), - which is what [[schmonz]] will be migrating from. -* Think carefully about... - * UTF-8. - * Other templates with `CONTENT` and whether they want to learn - about `ENCLOSURE` (maybe `aggregatepost.tmpl`?). - * Whether [[tips/howto avoid flooding aggregators]] suffices for - migrating a fancy podcast into ikiwiki. -* Verify that the feeds validate. +* Think carefully about UTF-8. * Verify that _all_ the tests pass (not just my new ones). -### Nice-to-have +## Migration -* Let the enclosure's MIME type be specified, in case someone ever - needs to disagree with `File::MimeInfo`. -* Extend [[plugins/inline]] to configurably generate additional - subscription links (such as iTunes) alongside the RSS/Atom ones. -* Verify that [[plugins/more]] plays well with fancy podcasts. -* Allow enclosures that are outside the wiki. +### Upgrading within ikiwiki: from simple to fancy -### Status +#### My test podcast -[[!table data=""" -Feature |iTunes RSS|iTunes Atom|Downcast RSS|Downcast Atom -Feed image | - | - | - | - -Feed title | + | + | + | + -Feed publisher | - | - | - | - -Feed "category" | - | - | - | - -Feed date | + | + | + | + -Feed description | - | - | - | - -Episode image | - | - | - | - -Episode title | + | + | + | + -Episode date | + | + | + | + -Episode duration | - | - | - | - -Episode author | + | + | + | + -Episode description| + | + | + | - -Episode enclosure | + | + | + | + -"""]] +For this test, I chose a podcast that tries to work around ikiwiki's +current limitations by issuing two separate `inline`s: + +* One with `feedonly=yes` that includes `.mdwn`, `.pdf`, and `.mp3` +* One with `feeds=no` that includes only `.mdwn` (and makes a trail) + +This has the following effects: + +* Browser: sees just the articles (each of which has a manually + created link to its corresponding media file) +* Feedreader: sees all the articles and media in one flat stream +* Podcatcher: sees just the media (sans articles) + +I want instead to write one `inline` with these effects: + +* Browser: sees just the articles (each of which automatically links + to its enclosure) +* Feedreader: sees just the articles (each of which specifies its + enclosure) +* Podcatcher: sees just the enclosures (each of which has an enclosing + article, rendered as the media's "description") + +#### Upgrade steps + +7. Set up a non-production copy of the podcast. + 7. Visually diff RSS and Atom feeds against production. + 7. Subscribe to the copy (both feeds) in `r2e`, iTunes, Downcast. +7. Apply fancypodcast patch to the installed ikiwiki: + 7. `cd ~/Documents/trees/ikiwiki && git checkout fancypodcast` + 7. `git diff --no-prefix master > ~/Documents/trees/localpatches/www/ikiwiki/fancypodcast.diff` + 7. `cd ~/Documents/trees/pkgsrc-current/www/ikiwiki && make deinstall && make install clean` +7. Verify that simple podcasts are unaffected: + 7. Rerun `ikiwiki --setup`. + 7. `diff -uB simple-before.rss simple-after.rss` + * A few new elements and attributes, as expected. + 7. `diff -uB simple-before.atom simple-after.atom` + * No change. +7. Remove the feed-only `inline` and enable feeds on the remaining one. +7. Convert articles' manual download links to `\[[!meta enclosure=""]]`. +7. I want existing and future podcatchers to get my new fancy + episodes, and I know my podcast isn't in any planets, so I'm + going to skip [[tips/howto avoid flooding aggregators]]. +7. Rerun `ikiwiki --setup`. +7. Verify browser shows the same stuff. +7. `diff -uB simple-after.rss fancy-after.rss # and atom` + * MP3s and PDFs are no longer naked enclosures, but belong to + articles as they should. + * Articles have updated modification times, as they should. +7. `r2e run` (both RSS and Atom) + * Nothing new with the default `trust-guid = True` (otherwise + would expect updated articles). +7. iTunes "Update Podcast" (both RSS and Atom) + * Added one episode per article, with article text as the episode + description. + * Kept old naked-enclosure episodes around. +7. Downcast refresh (RSS): + * Added one episode per article, with article text as the episode + description. + * Kept old naked-enclosure episodes around. +7. Downcast refresh (Atom): + * Added one episode per article, with no episode description + (expected, see feature table). + * Kept old naked-enclosure episodes around. + +Different tradeoffs are possible. These seem okay to me. + +### Importing into ikiwiki: fancy (from another CMS) + +#### My test podcast + +For this test, I chose a podcast currently being published with +Textpattern and tru_podcast, because I'd strongly prefer to publish +it with ikiwiki instead. + +#### Upgrade steps + +7. Set up a non-production copy of the podcast. + 7. Visually diff RSS and Atom feeds against production. + 7. Subscribe to the copy (both feeds) in `r2e`, iTunes, Downcast. +7. With a fancypodcast-enabled ikiwiki installed: + 7. Copy content from Textpattern to ikiwiki: + 7. Match article paths to preserve `/YYYY/MM/DD/post-title` permalinks. + 7. Match enclosure paths (or redirect) to preserve Textpattern's URLs. + 7. Match titles, post dates, and guids with `\[[!meta]]`. + 7. Match feed paths with permanent redirects from `/atom/` to + `/index.atom` (and same for RSS). + 7. `\[[!inline]]` the articles. + 7. Rerun `ikiwiki --setup`. +7. Stop Textpattern, start ikiwiki. +7. Verify that podcatchers see the feeds and don't redownload anything. +7. Naively add two new blog posts, one with an enclosure. +7. Verify that podcatchers download the new enclosures. + +----- + +## Future improvements + +### iTunes fancy podcasting + +* [iTunes-specific tags](https://www.apple.com/itunes/podcasts/specs.html) + appear to be RSS-only + * If they work in Atom, teach `inline` to optionally iTunesify RSS/Atom. + * Else, add `itunes` as a third kind of feed (RSS plus more stuff). +* Notable tags for feeds: + * `itunes:subtitle` + * `itunes:author` + * `itunes:summary` (same as `description`) + * `itunes:owner` (includes `itunes:name` and `itunes:email`) + * `itunes:image href=''` + * `itunes:publisher` + * `itunes:category text=''` (can contain subcategories) + * `itunes:keywords` +* Notable tags for entries: + * `itunes:duration` + * [[!cpan Audio::TagLib]] might be fastest, if present and applicable + * [ffprobe](http://ffmpeg.org/ffprobe.html) is reasonably fast + * [mediainfo](http://mediainfo.sourceforge.net/) is way slower + * Cache computed durations as pagestate + +### Fancy podcast aggregating + +* Write tests comparing a fancy podcast (HTML and feeds) against + the same podcast aggregated and republished, then make them pass + via changes to `aggregatepost.impl` and [[plugins/aggregate]]. + +### Other ideas + +* Don't render template text (e.g., "Use this template to insert a + note into a page") in feeds. +* Optionally specify the enclosure's: + * MIME type, in case `File::MimeInfo` guesses wrong. + * Duration, in case `ffprobe` guesses wrong. +* Optionally specify enclosures outside the wiki: + * Some people don't want to store big unchanging files in the VCS. + * Other people like [podcasting found media](http://huffduffer.com/about). + * We'd have to download the file just to compute some metadata + about it, and then somehow not frequently re-download it. +* Configurably generate additional subscription links (such as + iTunes) alongside the RSS/Atom ones in [[plugins/inline]]. +* Support Apple's "enhanced podcasts" (if they're still relevant). + +### code review + + + # XXX better way to compute relative to srcdir? + + my $file = $absurl; + + $file =~ s|^$config{url}/||; + +I don't think ikiwiki offers a better way to do that, because there is +normally no reason to do that. Why does it need an url of this form here? +--[[Joey]] + +> In all the popular, production-quality podcast feeds I've looked +> at, enclosure URLs are always absolute (even when they could be +> expressed concisely as relative). [Apple's +> example](http://www.apple.com/itunes/podcasts/specs.html#example) +> does too. So I told \[[!meta]] to call `urlto()` with the third +> parameter true, which means the \[[!inline]] code here gets an +> absolute URL in `$pagestate{$p}{meta}{enclosure}`. To compute the +> enclosure's metadata, though, we of course need it as a local path. +> I didn't see a less +> [ongepotchket](http://www.jewish-languages.org/jewish-english-lexicon/words/1402) +> way at the time. If you have a better idea, I'm happy to hear it; +> if not, I'll add an explanatory comment. --[[schmonz]] + +>> I would be more comfortable with this if two two different forms of url +>> you need were both generated by calling urlto. It'd be fine to call +>> it more than once. --[[Joey]] + +>>> Heh, it was even easier than that! (Hooray for tests.) Done. +>>> --[[schmonz]] + + +
+ + + +Can't we avoid adding this div when there's no enclosure? --[[Joey]] + +> Sure, I've moved the `` check to outside the +> section-and-div block for `{,inline}page.tmpl`. --[[schmonz]] + + +Download this episode + +"Download this episode" is pretty specific to particular use cases. +Can this be made more generic, perhaps just "Download"? --[[Joey]] + +> Yep, I got a little carried away. Done. --[[schmonz]] + + - + - <TMPL_VAR AUTHOR ESCAPE=HTML>: <TMPL_VAR TITLE> + - + +This change removes the author name from the title of the rss feed, which +does not seem necessary for fancy podcasts. And it is a change that +could negatively impact eg, Planet style aggregators using ikiwiki. --[[Joey]] + +> While comparing how feeds render in podcatchers, I noticed that +> RSS and Atom were inconsistent in a couple ways, of which this was +> one. The way I noticed it: with RSS, valuable title space was being +> spent to display the author. I figured Atom's display was the one +> worth matching. You're right, of course, that planets using the +> default template and somehow relying on the current author-in-the-title +> rendering for RSS feeds (but not Atom feeds!) would be broken by +> this change. I'm having trouble imagining exactly what would break, +> though, since guids and timestamps are unaffected. Would it suffice +> to provide a note in the changelog warning people to be careful +> upgrading their planets, and to customize `rssitem.tmpl` if they +> really prefer the old behavior (or don't want to take any chances)? +> --[[schmonz]] + +>> A specific example I know of is updo.debian.net, when used with +>> rss2email. Without the author name there, one cannot see who posted +>> an item. It's worth noting that planet.debian.org does the same thing +>> with its rss feed. (That's probably what I copied.) Atom feeds may +>> not have this problem, don't know. --[[Joey]] + +>>> Okay, that's easy to reproduce. It looks like this _might_ be +>>> a simple matter of getting \[[!aggregate]] to populate author in +>>> `add_page()`. I'll see what I can figure out. --[[schmonz]] + +>>>> Yep, that was mostly it. If the feed entry defines an author, +>>>> and the author is distinct from the feed name, we now show `NAME: +>>>> AUTHOR`, else just show `NAME` (same as always). In addition, +>>>> the W3 feed validator says `` is invalid, so +>>>> I replaced it with ``, and all of a sudden `r2e` +>>>> gives me better `From:` headers. With the latest on my branch, +>>>> when I generate the same planet as updo and run `r2e` over it, +>>>> the names I get in `From:` look like so: + +* `"updo: Junio C Hamano"` +* `"updo: Greg Kroah-Hartman"` +* `"updo: Eric Raymond: esr"` (article author != feed name, so we get both) +* `"updo: Jannis Pohlman: Jannis Pohlmann"` (oops! I tweaked the real updo) + +>>>> --[[schmonz]] + + +++ b/templates/rsspage.tmpl + + xmlns:atom="http://www.w3.org/2005/Atom" + + + +Why is it using atom namespace inside an rss feed? What are the chances +every crummy rss reader on earth is going to understand this? I'd put it at +about 0%; I doubt ikiwiki's own rss reader understands such a mashup. +--[[Joey]] + +> The validator I used () told me to. +> Pretty sure it doesn't make anything work better in the podcatchers +> I tried. Hadn't considered that it might break some readers. +> Removed. --[[schmonz]] + + +ikiwiki + +Does this added tag provide any benefits? --[[Joey]] + +> Consistency with the Atom feed, and of course it trumpets ikiwiki +> to software and/or curious humans who inspect their feeds. The tag +> arrived only in RSS 2.0, but that's already the version we're +> claiming to be, and it's over a decade old. Seems much less risky +> than the atom namespace bits. --[[schmonz]] + +>> Sounds ok then. --[[Joey]]