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2019-10-02 14:00:33
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<wm-bot>
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Technical Advice IRC meeting starting in 60 minutes in channel #wikimedia-tech, hosts: - all questions welcome, more infos: https://www.mediawiki.org/wiki/Technical_Advice_IRC_Meeting
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2019-10-02 14:50:17
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<wm-bot>
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Technical Advice IRC meeting starting in 10 minutes in channel #wikimedia-tech, hosts: @Lucas_WMDE & @James_F - all questions welcome, more infos: https://www.mediawiki.org/wiki/Technical_Advice_IRC_Meeting
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2019-10-02 14:50:29
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<James_F>
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waves.
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2019-10-02 14:51:39
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<Lucas_WMDE>
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waves back
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2019-10-02 15:00:11
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<James_F>
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Okie-dokie, that's the time.
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2019-10-02 15:00:21
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<James_F>
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Welcome all to the weekly Technical Advice meeting.
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2019-10-02 15:00:36
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<James_F>
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Lucas_WMDE and are here and happy to answer any questions you might have.
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2019-10-02 15:00:49
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<Lucas_WMDE>
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o/
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2019-10-02 15:15:52
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<apergos>
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sure is a quiet session today
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2019-10-02 15:15:59
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<James_F>
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Indeed.
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2019-10-02 15:17:02
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<apergos>
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well, since no one else is asking anything, here's a question for you (for some vague value of "you"): why can I not via the mw api export all revisions of some set of pages, but only the current ones?
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2019-10-02 15:17:20
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<apergos>
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you would think that if special:export lets me do it from the browser, I ought to be able to do it from the api, but no.
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2019-10-02 15:17:29
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<James_F>
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I think that's for performance reasons.
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2019-10-02 15:17:38
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<James_F>
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Special:Export is very locked-down.
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2019-10-02 15:17:55
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<James_F>
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But a rights-restricted API would be fine.
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2019-10-02 15:18:00
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<apergos>
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well, presumably you can only get x number of revisions per request, you pass in a continue param, etc like all the batched api queries
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2019-10-02 15:18:24
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<James_F>
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The "and transcluded content" flag expands the scope a great deal.
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2019-10-02 15:18:32
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<James_F>
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And makes batching hard.
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2019-10-02 15:18:43
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<apergos>
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ugh transcluded
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2019-10-02 15:18:44
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<James_F>
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But yeah, we could do that.
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2019-10-02 15:19:01
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<apergos>
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but we could ("we", i.e. $someone)
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2019-10-02 15:19:14
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<apergos>
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...could do it for a stright up list of pages, no transclusions
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2019-10-02 15:19:15
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<James_F>
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Transcluded is the only valuable flag. "Get me this template and all its documentation, templatestyles, Scribunto modules, and sub-templates".
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2019-10-02 15:19:32
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<James_F>
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Sure, but would that be significantly useful?
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2019-10-02 15:19:49
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<James_F>
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(I don't use the API for content access, so I'm not the best judge of utility.)
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2019-10-02 15:19:55
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<apergos>
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it could save people the headache of digging out 10 pages from a 200gb dump set
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2019-10-02 15:20:40
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<apergos>
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just a 'nice to have'
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2019-10-02 15:20:55
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<James_F>
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Yes, but do they definitely want plain content without transclusions?
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2019-10-02 15:20:57
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<James_F>
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nods.
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2019-10-02 15:21:00
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<Lucas_WMDE>
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not sure how continuation would work here… would users have to “glue” the XML together themselves?
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2019-10-02 15:21:21
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<ankry>
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I have a question about processing templates provided to LUA function via frame:getParent().args
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2019-10-02 15:21:21
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<apergos>
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each xml file would have to have the full mediawiki, siteinfo, and page/title tags
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2019-10-02 15:21:30
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<apergos>
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then a set of revisions
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2019-10-02 15:21:36
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<apergos>
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oooh a question! woo
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2019-10-02 15:22:31
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<James_F>
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This is related to T40669 but AFAICT not the same, right?
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2019-10-02 15:22:32
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<stashbot>
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T40669: API export action does not support exporting specific revisions - https://phabricator.wikimedia.org/T40669
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2019-10-02 15:22:56
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<ankry>
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if a template calling LUA code is transcluded, the templates provided inside arguments are sometimes processed in wrong context (namespace)
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2019-10-02 15:22:56
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<apergos>
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James_F: yep, but I'm going to defer in favor of ankry's question, I can follow up at any time
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2019-10-02 15:23:07
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<ankry>
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any hint ow to avoid this?
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2019-10-02 15:23:07
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<James_F>
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Sure.
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2019-10-02 15:23:17
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<James_F>
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Lucas_WMDE: Do you know Lua enough to help ankry?
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2019-10-02 15:23:33
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<Lucas_WMDE>
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probably not :/
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2019-10-02 15:23:37
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<ankry>
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:(
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2019-10-02 15:23:40
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<Lucas_WMDE>
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ankry: do you have an example somewhere?
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2019-10-02 15:24:30
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<ankry>
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I have the templates, but not an example calling them
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2019-10-02 15:25:01
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<ankry>
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If I need to construct an example, then mabe till next meeting?
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2019-10-02 15:26:31
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<Lucas_WMDE>
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I have no idea who will be at the next meeting, tbh
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2019-10-02 15:26:36
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<Lucas_WMDE>
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but an example would probably help in general
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2019-10-02 15:26:49
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<Lucas_WMDE>
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are any Lua experts online at the moment who could help out?
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2019-10-02 15:30:55
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<ankry>
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Lucas_WMDE: If I do not use the templates in arguments, but replace them with their code ("substitute" them), everything works fine
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2019-10-02 15:33:04
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<ankry>
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looks like templates were processed in some context, their result cached some way and then the cached data used in another context. Unsure if this is a bug or feature
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2019-10-02 15:43:50
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<Lucas_WMDE>
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as far as I’m aware, Lua invocations are generally supposed to be pretty independent of each other
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2019-10-02 15:43:57
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<Lucas_WMDE>
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unless you opt into some sharing with mw.loadData()
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2019-10-02 15:44:23
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<Lucas_WMDE>
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so to me that sounds more like a potential bug
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2019-10-02 15:45:37
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<Lucas_WMDE>
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but multi-level substitution can also be terribly confusing – there’s some safesubst thing that I don’t understand at all
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2019-10-02 15:48:43
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<James_F>
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No-one does.
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2019-10-02 15:56:43
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<apergos>
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are there debugging tips you can provide for wading through the multiple levels of substitution? even that could help
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2019-10-02 15:57:56
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<James_F>
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With MW template craziness, generally I recommend simplifying as a way to avoid unexpected issues.
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2019-10-02 15:58:07
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<James_F>
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So instead of four levels of template indirection, try to do it in one or two.
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2019-10-02 15:58:08
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<James_F>
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Etc.
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2019-10-02 15:58:27
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<James_F>
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Each Lua call multiplies up the "bug surface" of things that can wrong.
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2019-10-02 15:58:42
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<James_F>
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ankry: Good luck. :-(
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2019-10-02 16:01:38
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<Lucas_WMDE>
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yeah, I don’t have any tips for this, sorry :/
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2019-10-02 16:01:48
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<Lucas_WMDE>
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guess that concludes the Technical Advice IRC Meeting…
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2019-10-02 16:01:52
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<James_F>
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OK, that's us at time.
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2019-10-02 16:02:03
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<Lucas_WMDE>
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you could try asking at https://discourse-mediawiki.wmflabs.org/
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2019-10-02 19:37:11
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<domas>
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hi!
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