Osprey Programming Language

A modern functional programming oriented language designed for elegance, safety, and performance. It is written in Go and outputs to LLVM.

# Add the tap
brew tap melbournedeveloper/osprey

# Install Osprey
brew install osprey

git clone https://github.com/christianfindlay/vexels.git
cd vexels/compiler
make build
./bin/osprey examples/simple.osp

• Functional-first: Immutable data, pattern matching, pipe operators
• Type-safe: Algebraic data types with variant types
• HTTP-native: Built-in server/client with streaming support
• Fiber concurrency: Lightweight isolated execution contexts
• Zero-cost abstractions: Compiles to efficient LLVM IR

// Variables and functions
let x = 42
fn add(x, y) = x + y

// Types and pattern matching
type Result = Ok { value: Int } | Error { message: String }
let status = match result {
    Ok -> "success"
    Error -> "failed"
}

// HTTP server
httpServer(8080) |> onRequest((req) => 
    response(200, "Hello World")
)

• compiler/ - Main Osprey compiler (Go + ANTLR)
• vscode-extension/ - VSCode language support
• website/ - Documentation site
• webcompiler/ - Browser-based compiler

• Language specification
• API reference
• Contributing guide

Built on proven tech: Go for the compiler, ANTLR for parsing, and LLVM for code generation.

The best part: You don't need to be a compiler expert. AI agents like Claude Sonnet 4 with Cursor make implementing language features accessible to anyone willing to learn. That combo was the first that actually got me over the hump of building a compiler, though other AI setups could get you there too.

Use VS Code Dev Containers - strongly recommended. Open in VS Code and hit "Reopen in Container". Everything's pre-configured.

cd compiler
make install-deps  # Install Go dependencies
make build         # Build compiler
make test          # Run tests
make regenerate-parser  # Regenerate from grammar

Want to add a new operator or language feature? Check out CONTRIBUTING.md for the AI-assisted workflow that works.

🚧 Alpha: Core language features implemented. HTTP and fiber systems in development.

See compiler/spec.md for implementation status and roadmap.

MIT License - see LICENSE