java/Package.swift at main · purpln/java · GitHub

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// swift-tools-version: 6.0

import PackageDescription
import Foundation

let package: Package

if Context.environment["__CFBundleIdentifier"] == "com.apple.dt.Xcode" {
    func findJavaHome() -> String {
        if let home = Context.environment["JAVA_HOME"] {
            return home
        }

        // This is a workaround for envs (some IDEs) which have trouble with
        // picking up env variables during the build process
        if let home = Context.environment["HOME"],
           let path = try? String(contentsOfFile: "\(home)/.java_home", encoding: .utf8).split(separator: "\n").first {
            return String(path)
        }

        preconditionFailure("Please set the JAVA_HOME environment variable to point to where Java is installed.")
    }
    let javaHome = findJavaHome()

    let javaIncludePath = "\(javaHome)/include"
    #if os(Linux)
    let javaPlatformIncludePath = "\(javaIncludePath)/linux"
    #elseif os(macOS)
    let javaPlatformIncludePath = "\(javaIncludePath)/darwin"
    #elseif os(Windows)
    let javaPlatformIncludePath = "\(javaIncludePath)/win32"
    #endif

    package = Package(name: "Java", products: [
        .library(name: "Java", targets: ["Java"]),
    ], targets: [
        .target(name: "Java", dependencies: [
            "JavaRuntime",
            "JavaTypes",
        ], swiftSettings: [
            .unsafeFlags(["-I\(javaIncludePath)/", "-I\(javaPlatformIncludePath)/"]),
        ], linkerSettings: [
            .unsafeFlags([
                "-L\(javaHome)/lib/server",
                "-Xlinker", "-rpath",
                "-Xlinker", "\(javaHome)/lib/server",
            ], .when(platforms: [.linux, .macOS])),
            .unsafeFlags([
                "-L\(javaHome)/lib"
            ], .when(platforms: [.windows])),
            .linkedLibrary("jvm"),
        ]),
        .target(name: "JavaRuntime", swiftSettings: [
            .unsafeFlags(["-I\(javaIncludePath)/", "-I\(javaPlatformIncludePath)/"]),
        ]),
        .target(name: "JavaTypes"),
    ])
} else {
    package = Package(name: "Java", products: [
        .library(name: "Java", targets: ["Java"]),
    ], targets: [
        .target(name: "Java", dependencies: [
            "JavaRuntime",
            "JavaTypes",
        ]),
        .target(name: "JavaRuntime"),
        .target(name: "JavaTypes"),
    ])
}