Changelog

Unreleased

mapdiff --index runs the language indexers in the background. The map opens straight away and gains references when they finish; after files change, they run again the next time the page is loaded.
The bar above the map says how references are found: by name, indexing, or by type, with an Index button and a note when an indexer is not installed.
mapdiff list shows every running server: its repository, address, the change it last drew, and how long it has been up.
mapdiff stop stops the server of the repository you are in, and --all stops every one.
mapdiff clean stops every server and removes everything mapdiff has written: review marks, fetched pull requests, temporary copies of files and the cache folder.
A server stopped with kill now removes its temporary files, as one stopped with Ctrl-C does.

The first version.

Scopes for Rust, Python, TypeScript and JavaScript: a repository as directories, files, types, functions and fields, each with an ID.
Changes by scope: added, removed, modified, renamed and moved, with what kind of change it was (signature, body, comments, formatting, access). Line counts equal git’s.
A reference graph: by name out of the box, and by type after mapdiff index (rust-analyzer, scip-typescript, scip-python).
A reviewer page (mapdiff serve): the change as a tree of scopes with before and after side by side, filters, keyboard navigation and review marks.
A map of the repository at four levels, drawing only what is on screen, with search, selection, paths to callers and dependencies, and a trace view.
A change on the map: colours and counts, a list in reading order, before and after under the map, affected and neighbouring code, the map cut down to the change, GitHub pull requests by number.
Tests are left out of the map and the graph, and are not read. A changed test is still listed in a review.
One binary: the page is built into mapdiff.