🐛 fix: select most specific LSP server based on rootDir

[elad12390]

Problem

Fixes #23

When multiple LSP servers support the same file extension with different rootDir values (common in monorepos), cclsp was selecting the first matching server regardless of which workspace the file belongs to.

Root Cause

The getServerForFile() method used first-match logic based only on file extension:

const server = this.config.servers.find((server) => server.extensions.includes(extension));

This ignored the rootDir configuration entirely.

Solution

When multiple servers match a file's extension, now selects the server whose rootDir most specifically contains the file (longest matching path). This ensures each file is analyzed by the correct workspace-aware LSP server.

Example:

{
  "servers": [
    { "extensions": ["ts"], "command": ["ts-server"], "rootDir": "." },
    { "extensions": ["ts"], "command": ["ts-server"], "rootDir": "repos/app" }
  ]
}

File at repos/app/src/test.ts → Uses server with rootDir: "repos/app" (more specific)
File at other/test.ts → Uses server with rootDir: "." (fallback)

Changes

• Updated getServerForFile() to select based on most specific rootDir
• Added comprehensive tests for server selection logic
• Maintains backwards compatibility with single-server configurations

Testing

✅ All existing tests pass (158 tests)
✅ Added 7 new test cases for server selection
✅ Linting and type checking pass

bun test src/server-selection.test.ts
 7 pass
 0 fail

[ktnyt]

LGTM! Thank you for your contribution!

[ktnyt]

@elad12390 The fix has been released as v0.6.2. Thank you again!

[elad12390]

@ktnyt Yay thanks happy to help :)