Broad coverage
Completion, navigation, hierarchy, formatting, rename, links, diagnostics, and semantic tokens.
γ Cygni · language intelligence
Speak server fluently.
A pure Ruby LSP client for server lifecycle, document synchronization, diagnostics, semantic tokens, navigation, and workspace edits.
- JSON-RPC + LSP
- Ruby ≥ 3.1
- MIT licensed
ruby-lsp / example.rbready
Documentversion 4
UTF-16 position
UTF-16 position
Diagnostics2 published
0 errors
0 errors
Sadr clientepoch 1
42 pending
42 pending
Completion18 items
validated
validated
Semanticdelta applied
1,204 tokens
1,204 tokens
Own the protocol edge.
Sadr validates what crosses the client boundary and leaves buffers, text storage, and interface policy with the host application.
Precise positions
Convert byte offsets and UTF-16 positions through any caller-owned compatible text index.
Resilient sessions
Cancellable futures, strict response validation, lifecycle control, and automatic server recovery.
Start the server.
Open a document and request language intelligence with ordinary Ruby objects.
$ bundle add sadr
client = Sadr::Client.new(
command: ["ruby-lsp"]
)
client.start
client.open(document)
client.completion(document.uri, position).await