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+# The Rustdoc 2019 Roadmap
+
+As one of the core tools that affects how people perceive Rust both inside and outside the
+community, it's important that we maintain rustdoc's reputation as one of the best API documentation
+generators. There are a number of in-progress features and numerous incoming feature requests that
+we need to balance between our limited resources and the existing tool design. That said, we believe
+there are a number of improvements we can make in a year that will help us continue to deserve that
+hard-earned reputation.
+
+In keeping with the growing theme of "**maturity**" coming from around the project, this year the
+Rustdoc Team will focus on *finishing what we've started*, *polishing what we have*, and *getting
+rustdoc in more and more places*. Put more concretely, here are our priorities in 2019:
+
+* Pushing existing unstable features to completion
+* Improving documenatation tests
+* Reviving JSON output
+* Experimenting with an archive and server to emit fewer files
+
+Each of these items is either an extension to an existing feature in rustdoc, or included to address
+prominent issues faced by production users and large portions of the community. By pushing these
+features, rustdoc can grow with the community as Rust gains more and more users.
+
+To provide some extra detail for each item:
+
+## Pushing existing unstable features
+
+There are (at least) three high-profile unstable features for rustdoc that are partially
+implemented. All these features are seeing a fair amount of use already in the community, and they
+work well for most situations. But for each one, there's some implementation problem that is keeping
+it from being pushed all the way to stabilization. For this year, the Rustdoc Team would like to
+coordinate efforts to push these features to their fullest, and call for their stabilization:
+
+* Intra-doc links
+* Cross-platform docs with `#[doc(cfg)]`
+* Documentation management with `#[doc(include)]`
+
+## Improving documentation tests
+
+Documentation tests (commonly called "doctests") are one of the most powerful features of rustdoc.
+The ability to ensure that code samples written into documentation are always valid code creates
+confidence in documentation that won't go out of sync with the code it's describing. That said,
+there are still places where doctest code can be improved, or new features added to make them more
+useful in situations where they're not available today. For this year, the Rustdoc Team would like
+to create a "Doctests Working Group" to focus on improvements to the doctest system. Some initial
+ideas put forth include:
+
+* Cross-compilation of doctests
+* Improvements in doctest error reporting
+* Refactoring [code detection][] to properly handle more kinds of code
+
+[code detection]: https://quietmisdreavus.net/code/2018/02/23/how-the-doctests-get-made/
+
+## JSON output
+
+Several years ago, rustdoc supported outputing JSON in addition to its usual HTML. However, the old
+implementation of it was buggy and incomplete, so it was eventually removed. This hasn't stopped
+people from desiring the feature, though. Having a machine-readable format of the API of a crate
+that focused on its documentation would allow Rust documentation to be more easily integrated into
+other documentation hosts, or to allow the creation of alternative "frontends" that consume the JSON
+to create a different output from rustdoc's classic static HTML files. For this year, the Rustdoc
+Team would like to investigate the revival of JSON output and create an initial implementation, to
+allow users to experiment with the format.
+
+## Experimental archive format output
+
+One of the biggest performance problems facing rustdoc, especially on Windows, is the fact that it
+generates at least one file per documentable "item" in the crate. This is a result of the fact that
+rustdoc acts like a static site generator, creating a plain set of web pages from its input. This
+combines with the design of the output site to give each item its own webpage to breathe to force
+the creation of so many files. One solution to this problem is to make rustdoc output an
+intermediate format, like the aforementioned JSON. This could offload the presentation layer to
+something that can take an alternate direction with the design of the site.
+
+Another way is to change the encoding of the files on disk. Last year, an [experimental web
+server][] was created that used a custom archive format to stream compressed files directly without
+decompressing the files and recompressing them again. It was made to serve rustdoc HTML output
+effeciently, and demonstrates its use in documentation by compressing documentation created by
+rustdoc. For this year, the Rustdoc Team would like to investigate extending its custom archive
+format and emitting it natively, so that users can reap the benefits of the file server without
+having to emit all the HTML files first.
+
+[experimental web server]: https://github.com/killercup/static-filez