Perry Weather

A native cross-platform weather app built with the Perry TypeScript-to-native compiler. One TypeScript codebase compiles to native ARM64 executables for macOS, iOS, and Android — no runtime, no VM, no bridge.

Features

• Live weather data from Open-Meteo (free, no API key)
• Current conditions with temperature, humidity, wind speed, and feels-like
• 24-hour temperature chart drawn on a native canvas
• 5-day forecast
• City search via geocoding API
• Location support (CoreLocation on macOS/iOS, LocationManager on Android)
• Dynamic background gradients based on weather conditions
• Keyboard shortcuts on macOS (Cmd+R refresh, Cmd+L search, Cmd+G location)

Project Structure

src/
main.ts # macOS entry point
main_ios.ts # iOS/iPadOS entry point
main_android.ts # Android entry point
weather_api.ts # Open-Meteo API client
geocoding_api.ts # City search / geocoding
ui_current.ts # Current weather UI builder
ui_forecast.ts # 5-day forecast UI builder
ui_chart.ts # Temperature chart (canvas drawing)
ui_search.ts # Search bar and results
weather_icons.ts # Weather code to emoji/description mapping
colors.ts # Theme colors based on weather
formatting.ts # Temperature, wind, humidity formatters
xcode/
project.yml # XcodeGen project spec (macOS + iOS targets)
WeatherMac/ # macOS assets, Info.plist, entitlements
WeatheriOS/ # iOS assets, Info.plist
perry.toml # Perry project config

Building

Prerequisites

• Perry compiler (perry binary in PATH or at a known location)
• Xcode 16+ (for macOS/iOS targets)
• XcodeGen (to generate .xcodeproj from project.yml)

macOS

# Build the Perry compiler (if building from source)cd /path/to/perry && cargo build --release
# Compile directly
perry compile src/main.ts -o weather --target macos
./weather
# Or via Xcode (uses post-build script to compile with Perry)cd xcode && xcodegen generate
open Weather.xcodeproj
# Build and run the "Weather" scheme

iOS

# Compile for simulator
perry compile src/main_ios.ts -o weather_ios --target ios-simulator
xcrun simctl install booted weather_ios.app
# Or via Xcodecd xcode && xcodegen generate
# Build and run the "Weather iOS" scheme

Android

# Compile (requires ANDROID_NDK_HOME)
perry compile src/main_android.ts -o weather_android --target android
# Build APK with gradle, install on device

How It Works

Perry compiles TypeScript directly to native ARM64 machine code via Cranelift. The UI layer uses platform-native widgets:

• macOS: AppKit (NSTextField, NSButton, NSStackView, etc.)
• iOS: UIKit (UILabel, UIButton, UIStackView, etc.)
• Android: Android Views (TextView, Button, LinearLayout, etc.) via JNI

There is no JavaScript runtime, no WebView, and no React Native bridge. The compiled binary is a standard native executable (4.4 MB on macOS) that links directly against platform frameworks.

License

MIT