List Swift toolchain IDs

list-toolchains.swift

#!/usr/bin/env swift

import Foundation

let toolchainsDir = URL(fileURLWithPath: "/Library/Developer/Toolchains")

struct ToolchainInfoPlist: Codable {
    var bundleIdentifier: String
    var createdDate: Date
    var displayName: String

    enum CodingKeys: String, CodingKey {
        case bundleIdentifier = "CFBundleIdentifier"
        case createdDate = "CreatedDate"
        case displayName = "DisplayName"
    }
}

func readPlist(url: URL) throws -> ToolchainInfoPlist {
    try PropertyListDecoder().decode(ToolchainInfoPlist.self, from: Data(contentsOf: url))
}

func getToolchainInfo(toolchainsDir: URL) throws -> [ToolchainInfoPlist] {
    try FileManager.default.contentsOfDirectory(atPath: toolchainsDir.path)
        .map { toolchainsDir.appendingPathComponent($0) }
        .filter(\.hasDirectoryPath)
        .map { $0.appendingPathComponent("Info.plist") }
        .map(readPlist(url:))
}

try getToolchainInfo(toolchainsDir: toolchainsDir)
    .sorted(by: { $0.bundleIdentifier < $1.bundleIdentifier })
    .forEach {
        print("Name:", $0.displayName)
        print("xcrun --toolchain \($0.bundleIdentifier) swift --version")
        print()
}