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Updates and simplification for mkdocs #4556

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merged 4 commits into from
Sep 12, 2018

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davidfischer
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@davidfischer davidfischer commented Aug 22, 2018

This PR simplifies the mkdocs builder and tries to have maximum compatibility between mkdocs versions.

Changes

  • RTD should be compatible with mkdocs 0.15.x, 0.17.x, and 1.x.
  • No longer pass the --theme readthedocs option to mkdocs. Starting in mkdocs>=1.0, this overrides theme settings in mkdocs.yml and it can override mkdocs.yml depending on some options in 0.17 (see this comment for details). This makes the default theme on MkDocs the "mkdocs" theme rather than the readthedocs theme. People who want the readthedocs theme will need to specify that in their mkdocs.yml. This is the default functionality of mkdocs outside of Read the Docs.
  • Don't partially override the mkdocs readthedocs theme with some extra templates. These are incompatible depending on the version of mkdocs being used.
  • The lower right corner flyout menu (like what's used on all sphinx themes except the RTD theme) will be used on all themes of mkdocs.
  • To summarize, the only changes we make to mkdocs when executed on RTD is to inject our CSS/JS (flyout menu, etc.) and to replace the default Google Analytics setup with the Read the Docs GA setup which respects Do Not Track.

Screenshot

screen shot 2018-08-22 at 10 08 05 am

Notice the flyout menu in the lower right rather than overriding the mkdocs RTD theme.

Fixes

Fixes #4314
Fixes #4549
Fixes #4448

@davidfischer davidfischer requested a review from a team August 22, 2018 17:13
@@ -7,6 +7,9 @@
display: block;

bottom: 50px;

/* Workaround for mkdocs which set a specific height for this element */
height: auto;
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This fixes the bug seen here which is currently visible on https://mkdocs.readthedocs.io/en/stable/

screen shot 2018-08-22 at 10 16 18 am

'%s/readthedocs/templates/mkdocs/readthedocs' % settings.SITE_ROOT
)
# The default theme for mkdocs is the 'mkdocs' theme
DEFAULT_THEME_NAME = 'mkdocs'
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Why not default to the rtd theme when users don't have a theme or theme.name?

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Starting with mkdocs>=1.0, theme is required. Also, this is another source of confusion where Read the Docs does something different than the default MkDocs functionality. I believe we shouldn't be changing users' intents.

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that makes sense, I wonder if this is good for old projects, all of them were building with the rtd theme, right?

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I like to keep the same behavior outside than inside RTD.

I want to echo Santos' question: what would happen with old projects that weren't specifying the them? Will they start building with the mkdocs theme? If so, I suppose we should do something to avoid that

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Assuming they target mkdocs<1.0 and don't specify a theme, they will start to build with the mkdocs theme. This would be the same behavior as if they built locally. Starting with mkdocs>=1.0, they will fail to build with an error because theme is required.

Frankly, I think switching them to the mkdocs theme is the correct behavior as then their project builds with the same theme inside and outside RTD. In general, however, I suspect not a lot of projects do not specify a theme.

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I am -1 on this particular change, I think projects should keep the readthedocs theme if that is what they have been building their projects with. We can use a date-based feature flag if necessary, to ensure that projects before the feature flag get the readthedocs theme.

If the user hasn't changed to a custom theme, I don't think we can accurately determine whether they want the default mkdocs theme or our theme, so i'm more inclined to just keep our theme for these users.

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I put some thoughts here about this. I moved the discussion a bit since it references multiple comments.

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davidfischer commented Aug 22, 2018

I built a small project that lets you switch between different themes and versions of mkdocs. It is probably useful for verification but also for illustrating some of the issues highlighted above.

https://rtd-mkdocs-test-project.readthedocs.io/

Edit: This PR is supposed to fix these issues.

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I ❤️ these changes.

I'm not sure about the JS ones because I don't know that code, but they look good to me.

I just left a question that we should consider for old project that are not defining any theme. For those projects, we should keep readthedocs theme, I suppose.

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One thing I would like to add either to this PR or another one is to recommend that authors using mkdocs on Read the Docs have a requirements file that pins mkdocs to a major version.

We don't have a lot of docs on mkdocs, but do you think https://docs.readthedocs.io/en/latest/builds.html is a good place?

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stsewd commented Aug 23, 2018

https://docs.readthedocs.io/en/latest/getting_started.html looks like a good place, maybe another PR making the suggestion for both, sphinx and mkdocs

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The less we mess with mkdocs, probably the better, so that we have the most compatibility. I don't think we're indexing search from mkdocs, so I don't know how much value we're really providing for projects beyond just being a dumb host, but that's probably fine in terms of compatibility.

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I don't know how much value we're really providing for projects beyond just being a dumb host

Hosting multiple concurrent versions is something but I agree.

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getting_started.html looks like a good place, maybe another PR making the suggestion for both, sphinx and mkdocs

I added a note about pinning versions in #4562.

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Is it pure coincidence that over at MkDocs a PR emerged recently to align their version of the RTD theme with upstream again: mkdocs/mkdocs#1594

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I don't know how much value we're really providing for projects beyond just being a dumb host

Makes me wonder...was is/was the motivation to support MkDocs as a documentation type then? Would things be different if the Sphinx + CommonMark combination had existed when you started?

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Is it pure coincidence that over at MkDocs a PR emerged recently to align their version of the RTD theme with upstream

I believe it is coincidence. I haven't spoken with them about it.

@agjohnson agjohnson added the Needed: design decision A core team decision is required label Aug 27, 2018
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While I'm not super tied to requiring our theme, removing default of our theme for mkdocs projects like this does feel like we're stepping further away from mkdocs support and into straight dumb host territory. I think this will just make me even less inclined to support mkdocs going forward.

At least now, our branding is apparent and we have added some functionality. I really don't know what the middle ground is though. Obviously the user experience now is not really acceptable either.

I guess I'd be mostly 👍 on removing our theme as the default under the assumption that we are returning to this to 1) resolve the theme support issues, 2) re-enable our theme as default, and 3) get mkdocs closer to feature parity. Otherwise, without someone from the mkdocs community helping to guide a mkdocs integration, we aren't creating a good user experience here -- and it's costing a good deal of effort still.

@agjohnson agjohnson added this to the 2.7 milestone Aug 27, 2018
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I'm not involved with either community; just an active user of both MkDocs and RTD (creating issues and the odd small PR here and there). I appreciate the effort @davidfischer has been putting into this but I share @agjohnson's concerns. I feel that RTD should have a vital interest that all projects it hosts use the default theme.
The headaches some of the recent MkDocs refactorings have caused you (and still do) should ideally be a thing of the past. I understand they were necessary to bring the project to 1.0 and make it ready for the future. I put a question mark behind the statement

RTD should be compatible with mkdocs 0.15.x, 0.17.x, and 1.x.

How about just supporting 1.x going forward?

...without someone from the mkdocs community helping to guide a mkdocs integration..

As a user I would be very happy to see open or behind-the-scenes collaboration between RTD and @waylan. A smooth and seamless integration would/should benefit both projects I would assume.

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stsewd commented Aug 28, 2018

How about just supporting 1.x going forward?

Sadly we still need to keep building projects < 1.x, as they are already has been built by rtd. Breaking those projects is a bad user experience.

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humitos commented Aug 28, 2018

Sadly we still need to keep building projects < 1.x, as they are already has been built by rtd. Breaking those projects is a bad user experience.

I agree with this, but maybe we can add this also to our deprecation list for next year together with APIv1 and others. What do you think? I'm assuming that this will simplify our code and we could remove some "guessing" that we have on it.

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I agree with this, but maybe we can add this also to our deprecation list for next year together with APIv1 and others. What do you think? I'm assuming that this will simplify our code and we could remove some "guessing" that we have on it.

Firstly, 1.x literally just came out. Deprecating pre-1.x in 4 months seems fast.

Secondly, how would you actually enforce this? People can just put mkdocs<1.0 into their requirements file. Some projects already do this or something similar. You could just make the change but then projects that previously built fine might run into issues on their next build which is never a good experience.

Overall, I think we need to firm up how we are going to handle builder requirements. Currently people can specify any version of sphinx or mkdocs they want and Read the Docs is just expected to work. Perhaps based on people's readthedocs.yml settings, a specific version of Sphinx/MkDocs is used and it can't be overridden. Our current setup is an enormous pain to test and every Sphinx extension or addition we make to mkdocs.yml or conf.py needs to support every Sphinx/MkDocs version. This doesn't scale.

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While I'm not super tied to requiring our theme, removing default of our theme for mkdocs projects like this does feel like we're stepping further away from mkdocs support and into straight dumb host territory.

@agjohnson I want to dig in on this statement a bit. I completely understand that the goal of Read the Docs is not to be a dumb host but I also want to make sure we are actually adding value when we say we are.

  • I am skeptical that making the Read the Docs theme the default for MkDocs adds value. If people want our theme, it's a one line change in their mkdocs.yml. Starting with MkDocs 1.0, specifying a theme is strictly required so this will be a non-issue as people adopt the new version.
  • I believe that docs built on Read the Docs should not have a different theme than when built locally simply because they were built on Read the Docs. This is surprising functionality when people are expecting their docs to just build. It removes people's ability to test and view changes prior to pushing.
  • I am not sure that the customizations to the Read the Docs theme on MkDocs added much value prior to this PR that removes them. All it did is enable the lower left version menu as opposed to the flyout. That was worth something but not much.
  • What does feature parity for MkDocs mean? PDF/ePub support? More extensions?

To me, I think this means we as the RTD maintainers need to do a better job setting out the vision for MkDocs (and Sphinx and other future docs builders) and how RTD aims to add value over a simple docs solution like building docs in Travis and hosting with GitHub Pages. Figuring this out is how we expand from being "the destination for Python docs" to "the destination for OSS docs".

  • One big advantage we have is that for simpler projects it's an easy import process to just start building docs on every push on RTD. The Travis/GitHub setup is non-trivial.
  • The biggest bit of value-add we have is the flyout menu. This shows multiple concurrently supported versions and links to github and other places. It is valuable. We should do more things like this.
  • As we are doing with Sphinx where many of our customizations are done with extensions, I think we should do the same with MkDocs plugins. I think we need to encourage people who use MkDocs to build plugins which are similar to some Sphinx ones we have like warning when the docs version being browsed is not the latest.

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waylan commented Aug 28, 2018

I believe that docs built on Read the Docs should not have a different theme than when built locally simply because they were built on Read the Docs. This is surprising functionality when people are expecting their docs to just build. It removes people's ability to test and view changes prior to pushing.

As a member of the MkDocs team, I agree. In fact, because RTD has traditionally ignored the theme setting and forced their own theme, we have mostly ignored the needs of RTD when developing MkDocs. However, if RTD is willing to honor users wishes (for themes, plugins etc), then we may be more willing to consider the needs of RTD.

For example, RTD needs to provide a way for users to be able to specify third party themes and/or plugins. This requires that the Python package first be installed, and then that the user include it in their MkDocs config file. It may be posable, but I have not seem any documentation on how to specify Python packages that are build dependencies on a project-by-project basis. Therefore. to most users, only the built-in themes and plugins are available. I'd like to see clear, documented support for third party themes and plugins, otherwise, trying to host MkDocs projects on RTD is a waste of users time.

Currently, the RTD theme included with MkDocs includes a partial template versions.html, which gets included in every page and, by default, does not display any "version" information. Of course, RTD could easily provide their own versions.html which would display version info (and maybe they do, I haven't checked). After all, the content within that partial template is in the same location on the page as the version info in the Sphinx built projects. Note that the mike project exists (by @jimporter), which is a standalone documentation versioning tool for MkDocs. With the cooperation of RTD, mike, and MkDocs, we could develop a standard for providing versions info in a universal way that could be supported by any theme. Then, users of all themes could potentially get full feature support when hosting on RTD. However, in the past when we've asked what RTD needs, we have received no response, so we moved forward without them.

In other words, this:

To me, I think this means we as the RTD maintainers need to do a better job setting out the vision for MkDocs (and Sphinx and other future docs builders) and how RTD aims to add value over a simple docs solution like building docs in Travis and hosting with GitHub Pages.

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It may be posable, but I have not seem any documentation on how to specify Python packages that are build dependencies on a project-by-project basis. Therefore. to most users, only the built-in themes and plugins are available.

This is currently possible and there are users doing this. RTD supports including a requirements file and then users can include whatever Python packages they want including plugins and themes. However, I'll agree that documented examples of third party theme and plugin use would be helpful. There is a bug with themes (which this PR fixes) where depending on the mkdocs version the theme may be overridden with the RTD theme.

However, in the past when we've asked what RTD needs, we have received no response, so we moved forward without them.

I don't know when this last was and RTD has definitely gone through time periods of being overwhelmed. However, our issue tracker is now quite active and if you have questions or want answers, don't hesitate to open an issue. I'll do the same on yours. Let's keep an open line of communication.

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Apologies in advance, many thoughts incoming

I am skeptical that making the Read the Docs theme the default for MkDocs adds value

The main value in maintaining a blessed Sphinx or mkdocs theme is that we can provide the reader user an experience that is consistent, expected, and highly usable. Cross device support is lacking for most documentation -- this was the main force behind developing a Sphinx theme in the first place.

I have more thoughts on where our theme and support for themes are headed, but that's another discussion. It is however in the direction of better generic support for multiple themes. But for now, we've tied our user experience to our lone theme and it's readership focus.

I believe that docs built on Read the Docs should not have a different theme than when built locally simply because they were built on Read the Docs.

We also force our theme on Sphinx projects by default, unless you explicitly specify a theme. I think the the behavior with mkdocs should match what we do with Sphinx, which isn't what we're doing ATM.

because RTD has traditionally ignored the theme setting and forced their own theme

For some history here, we had to force our theme as at the time, it was the only way for us to make our search backend integration work (and I believe the only way for us to get mkdocs to work at all). d0ugal was helping to maintain the integration for a while, but also lost the bandwidth to support this. Since then, our search integration is now 100% broken (#1088) and that's bad -- we need to get back to supporting our indexing in mkdocs to provide a consistent search.

Forcing our theme is certainly not a requirement, but the extension points that we need to provide some parity here didn't/don't exist in mkdocs. This really requires someone from the mkdocs community to help maintain, we can only provide second class support with hacks otherwise.

What does feature parity for MkDocs mean?

This is a long list, but I think we can overlook the disparity between authorship features if at least mkdocs has a somewhat similar readership user experience. Not breaking search UX is probably the biggest point here, but I don't know what it takes to get back to in-doc search on our backend. We were historically relying on some mkdocs code that was removed a few versions ago. We need a json output similar to Sphinx's to feed our index (regardless of theme) and we need a method of forcing our search backend on the built pages.

Future plans for search involve more in-doc search, so this divide in features will only become more apparent.

To me, I think this means we as the RTD maintainers need to do a better job setting out the vision for MkDocs

Agreed. We can certainly layout more issues on Mkdocs if there is someone willing to take the work on. Without any interaction with the mkdocs community, it's mostly just stale issues.

We need buy-in from the mkdocs community to support an integration properly, as we're spread too thin to take on support of a mkdocs ecosystem on top of Sphinx. Honestly, I'm already way more inclined to spend our time developing Sphinx core/extensions -- it's hard to justify the cost of building up another toolchain when the features we rely on already exist in Sphinx.

As we are doing with Sphinx where many of our customizations are done with extensions, I think we should do the same with MkDocs plugins

From an architectural/engineering standpoint, I definitely agree. Extensions are probably an more reasonable way for us to bend mkdocs to our will. Having a similar set of authoring features can certainly be a community effort. 👍

Unfortunately, we don't have the bandwidth to develop mkdocs tooling into the tooling that Sphinx is, especially when we're already neglecting efforts/opportunity to really improve Sphinx authorship features.

With the cooperation of RTD, mike, and MkDocs, we could develop a standard for providing versions info in a universal way that could be supported by any theme

I'm not familiar with mike, but for best chances of integration with RTD, we'd want the workflow to work as similar to what we already have as possible. We do a build pass per version, and store this in it's own path on disk. We're unlikely to support a special versioning integration if the support for versioning that mike generates is vastly different or a different process.

Long term, the vision for our version menu that I've been harping on for a while, is to make the footer return JSON, not HTML, so that the theme can do whatever it wants with the data. This might be our standard flyout, it might be a theme-specific flyout (like sphinx_rtd_theme). We need a strong API there though, in order to justify allowing themes to produce their own flyout experience.

Also, a stronger API won't remove the need for RTD to require more control over mkdocs. Extensions are probably still fine here.

Going forward

  • We can highlight more in issues what pieces we need from mkdocs. We need help here, we don't have the bandwidth to both provide an integration and advocate for changes upstream without contributors. The mkdocs milestone is a place to start, but is by no means an exhaustive list of issues.
  • I don't know what to do about the theme right now. @davidfischer perhaps we talk on this more as you have much more recent experience maintaining the mkdocs code and know the technical limitations. It would be helpful to determine what we're breaking and how we'll fix it.

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waylan commented Aug 29, 2018

Forcing our theme is certainly not a requirement, but the extension points that we need to provide some parity here didn't/don't exist in mkdocs. This really requires someone from the mkdocs community to help maintain, we can only provide second class support with hacks otherwise.

What we on the MkDocs team need from RTD is a clear documented list of those extension points. For example, we removed the JSON output because we were of the impression that it was unused (any internal use case had been replaced) and we considered it a waste of our resources to maintain. If we had a definitive list of things RTD needs, we could avoid that in the future.

Long term, the vision for our version menu that I've been harping on for a while, is to make the footer return JSON, not HTML, so that the theme can do whatever it wants with the data.

I think having the version data in JSON makes a lot of sense. I'm not exactly sure how that would look, but I like the general idea.

FYI, in mkdocs/mkdocs#1594 we have a PR which updates MkDocs RTD theme to better match the Sphinx RTD theme in look, behavior and functionality. It hasn't been finalized yet, but I expect it to be part of the MkDocs 1.1 release. Any feedback is certainly welcome.

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jimporter commented Aug 29, 2018

@agjohnson I'm not super-familiar with how RTD works as I've never used it, but mike is built around two main ideas:

  1. When you make a release of a project, the generated docs are a build artifact just as much as the actual binaries, so you shouldn't rebuild them unless you bump the version (in particular, you wouldn't do something like "I cut a new release, so now I'm regenerating docs for every tag in my repository").
  2. Different versions of docs are stored in subdirectories (e.g. http://example.com/1.0) and query a versions.json (example here) file one level up to determine what other versions are available. You can also alias versions to each other (e.g. latest may be an alias to 1.0); these are just copies, although symlinks would probably also work.

In mike, all the above is done with git, primarily targeting gh-pages on Github, although this mostly matters for generating the docs. Once they're built, they're just static web content sitting in a git branch and you could upload them pretty much wherever. It should be fairly straightforward for someone to make a tool that's compatible with the generated docs from mike that works with other setups (e.g. Mercurial, a dedicated webserver to host docs, etc).

If this sounds roughly-similar to RTD, I'm happy to make changes to the versions.json format or other aspect so that we converge on something. It would be pretty cool if multiple docs-generating tools all understood a common versions.json-type file so that project owners could easily switch between tools if they feel the need.

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Versions on RTD are tied to branches/tags, so no metadata is required on RTD. Our flyout API will just put this information into docs based on versions that are active at the moment, so it's currently working and probably not important to get addition context data into mkdocs themes unless we're doing something special.

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waylan commented Aug 29, 2018

@agjohnson from the MkDocs side, we don't care where you get your data from. We care about what format it is presented in to the theme. Document that and we'll consider building support for it into all our themes.

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@waylan in due time, sure. The problem now is we're not sure what needs to change between mkdocs and RTD -- hence this PR that brings mkdocs to a mostly vanilla experience. We're focusing on this PR first.

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Versions on RTD are tied to branches/tags, so no metadata is required on RTD. Our flyout API will just put this information into docs based on versions that are active at the moment

@agjohnson Just to clarify, mike doesn't expect users to make the versions.json file. That's all handled internally, and it's part of the automatically-generated site. I'm not sure how RTD decides what to show in its version selector, but for mike, it adds an extra JS file to the generated docs which fetches the versions.json file and injects the selector.

The important part of this is that it means the list of versions is dynamic. As mentioned above, mike operates on the philosophy that once you've built the docs for a particular version, you never need to rebuild that version. Hence, if I only have 1.0, then that's all you see in the selector; if I add 1.1, then the 1.0 docs will now automatically have 1.1 visible in the version selector without requiring a rebuild of the 1.0 docs.

In any case, I'm happy to help converge on a standard here, but I'm also equally happy with letting mike and RTD work totally differently. Whichever you think makes the most sense for RTD. :)

@davidfischer
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This PR is a little off the rails but I created #4588 to discuss more vision around MkDocs/RTD and possibly mike (which I admit I haven't fully investigated). My intention is for this to be merged relatively soonish and I don't want this discussion to just get closed and go away.

@davidfischer davidfischer merged commit 4450ec6 into master Sep 12, 2018
@davidfischer davidfischer deleted the davidfischer/mkdocs-upgrade-again branch September 12, 2018 22:52
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We released these changes to production today as part of our release.

@marcelstoer, everything looks good on NodeMCU. Let me know if you see otherwise.

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I was notified by GitPunch, thanks. So, you were the one who triggered a doc build just 15min ago? I also did that as soon as I learned about the release 😉

You're right, everything looks ok - except that I don't see any fly-out at all, neither bottom left nor bottom right.

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You're right, everything looks ok - except that I don't see any fly-out at all, neither bottom left nor bottom right.

This is most likely a caching delay. We also triggered a purge on our CDN so it may not have "gotten there" yet.

screen shot 2018-09-25 at 11 50 31 am

@marcelstoer
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This is most likely a caching delay.

Yep, spot on.

I also noticed that the view/edit On GitHub links are still broken but I don't know if they're provided like that from MkDocs.

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I also noticed that the view/edit On GitHub links are still broken but I don't know if they're provided like that from MkDocs.

I'm not super familiar with it to be honest but I don't think RTD is doing anything special.

@stsewd
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stsewd commented Sep 25, 2018

Oh, I think I have a PR to fix that (if you are asking for the link on the flyout menu)

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stsewd commented Sep 25, 2018

Here it is #3525

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Oh ya, the github link in the flyout menu (provided by us) is broken.

humitos added a commit that referenced this pull request Oct 24, 2018
Historically, we were using `readthedocs` as default theme for MkDocs
but in #4556 we decided to
change it to get the same behavior when building locally than in Read
the Docs.

This commit adds a Feature flag to keep having the old behavior for
some particular projects so we can add these project and do not break
their documentation (change the theme without asking/reason).
agjohnson pushed a commit that referenced this pull request Oct 24, 2018
* Feature flag to make `readthedocs` theme default on MkDocs docs

Historically, we were using `readthedocs` as default theme for MkDocs
but in #4556 we decided to
change it to get the same behavior when building locally than in Read
the Docs.

This commit adds a Feature flag to keep having the old behavior for
some particular projects so we can add these project and do not break
their documentation (change the theme without asking/reason).

* Typo
agjohnson pushed a commit that referenced this pull request Oct 24, 2018
Historically, we were using `readthedocs` as default theme for MkDocs
but in #4556 we decided to
change it to get the same behavior when building locally than in Read
the Docs.

This commit adds a Feature flag to keep having the old behavior for
some particular projects so we can add these project and do not break
their documentation (change the theme without asking/reason).
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