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Thanks to the efforts of the Elixir community, GitHub supports code navigation for Elixir repositories. Read how favorite language can add this support too!
We’re proud to announce the availability of search-based code navigation for the Elixir programming language. Yet this is more than just new functionality. It’s the first example of a language community writing and submitting their own code for search-based code navigation.
Since GitHub introduced code navigation, we’ve received enthusiastic feedback from users. However, we hear one question over and over again: “When will my favorite language be supported?” We believe that every programming language deserves best-in-class support in GitHub. However, GitHub hosts code written in thousands of different programming languages, and we at GitHub can commit to supporting only a small subset of these languages ourselves. To this end, we’ve been working hard to empower language communities to integrate with our code navigation systems. After all, nobody understands a programming language better than the people who build it!
Would you like to develop and contribute search-based code navigation for a language? If a Tree-sitter grammar tool exists for your language, you can do so using Tree-sitter’s tree query language. This language describes how our code navigation systems scan through syntax trees and how to extract the important parts of a declaration or reference. This process is known as tagging, and it’s integrated with the
tree-sitter command-line tool so that you can run and test tag queries locally. When a user pushes new commits or creates a pull request, the GitHub code navigation systems use tag queries to extract jump-to-definition and find-all-references information. Note: If you’re interested in how search-based code navigation works, you can read a technical report that describes the architecture and evolution of GitHub’s implementation of code navigation.
Complete documentation, including how to write unit tests for your tags queries, can be found here. For examples of tag queries, you can check out the Elixir tags implementation, or those written for Python or Ruby. Once you’ve implemented tag queries for a language, have written unit tests, and are satisfied with the output from
tree-sitter tags, you can submit a request on the Code Search and Navigation Feedback discussion page in the GitHub Discussions page in the GitHub feedback repository. The Code Navigation team will add this to their roadmap. When we’re confident in the quality of yielded tags and the load on the back-end systems that handle code navigation, we can enable it in testing for a subset of contributors, eventually rolling it out to all GitHub users, on both private and public repositories.
Please note that search-based code navigation is distinct from GitHub code search. Code search provides a view across all of the corpus of code on GitHub, whereas search-based code navigation is a part of the experience of reading code within a single repository. Search-based code navigation is also distinct from our support for precise code navigation. However, we hope to empower language communities to inform and contribute to the development of and support for these and other features in the future.
We’re committed to working with language maintainers and contributors to keep these rules as useful and up-to-date as possible. Whether you’re a longtime language contributor or someone seeking to enter the community for the first time, we encourage you to take a look at adding support for search-based code navigation, and join the community on the GiHub Discussions Page.