Scala LSP Setup

This command will configure your Scala development environment with Metals and essential tools.

Prerequisites Check

First, verify Coursier is installed:

cs --version

If not installed:

brew install coursier/formulas/coursier

Installation Steps

1. Install Metals LSP Server

cs install metals

2. Install Development Tools

# Formatting
cs install scalafmt

# Linting and refactoring
cs install scalafix

3. Verify Installation

metals --version
scalafmt --version

4. Enable LSP in Claude Code

export ENABLE_LSP_TOOL=1

Verification

Test the LSP integration:

# Create a test file
cat > test_lsp.scala << 'EOF'
object Main extends App {
  def greet(name: String): String = s"Hello, $name!"
  println(greet("World"))
}
EOF

# Run Scalafmt
scalafmt test_lsp.scala

# Clean up
rm test_lsp.scala