Six steps from zero to IDE

on YouTube ↗46m

" summary

Built a prototype called Metals since November that wires the Language Server Protocol to the build tool and compiler to deliver hover types, go‑to‑definition across modules and Java, rename, completions and refactorings. Diagnostics use the SBT server to publish diagnostics on save (no noisy as‑you‑type false errors). Navigation comes from an indexed SemanticDB emitted by compilation for millisecond lookups, completions combine fuzzy index search and the presentation compiler, and edits are applied via scala-fix patches and workspace/applyEdit. It recovers from broken copy‑paste and is usable in VS Code and experimental Vim clients.

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" chapters (7)

1. 0:00Start
2. 3:50Pretty basic features
3. 10:25Rest of the talk
4. 11:39Language Server Protocol
5. 20:11SemanticDB
6. 35:01Build Server Protocol
7. 36:40Conclusion

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