Add —availability filter to list-devices

Sources/XcodeSimulatorKit/CommandLineOptions.swift

@@ -2,11 +2,23 @@ import Foundation
 import Basic
 import SPMUtility
 
+struct FilteringOptions {
+    enum Availability: String, StringEnumArgument {
+        case yes
+        case no
+        case all
+
+        public static var completion: ShellCompletion = .none
+    }
+
+    var availability: Availability = .yes
+}
+
 struct CommandLineOptions {
     enum SubCommand {
         case noCommand
         case version
-        case listDevices
+        case command(Command)
     }
 
     struct Error: Swift.Error {
@@ -22,10 +34,13 @@ struct CommandLineOptions {
             argumentParser.printUsage(on: stream)
         }
     }
+    struct NoCommandError: Swift.Error { }
 
     private let parser: ArgumentParser
     private(set) var subCommand: SubCommand
 
+    private static let allCommands: [Command] = [ListDevicesCommand()]
+
     static func parse(commandName: String, arguments: [String]) throws -> CommandLineOptions {
         let parser = ArgumentParser(
             commandName: commandName,
@@ -36,29 +51,53 @@ struct CommandLineOptions {
 
         let binder = ArgumentBinder<CommandLineOptions>()
 
-        binder.bind(option: parser.add(
+        binder.bind(
+            option: parser.add(
                 option: "--version",
-            shortName: "-v",
                 kind: Bool.self,
                 usage: "Prints the version and exits"
             ), to: { options, _ in
                 options.subCommand = .version
-        })
-
-        parser.add(
-            subparser: "list-devices",
-            overview: "List available Xcode Simulator devices"
+            }
         )
 
-        var options = CommandLineOptions(parser: parser, subCommand: .noCommand)
-        do {
-            let result = try parser.parse(arguments)
-            switch result.subparser(parser) {
-            case "list-devices":
-                options.subCommand = .listDevices
-            default:
-                try binder.fill(parseResult: result, into: &options)
+        binder.bind(
+            parser: parser,
+            to: { options, subcommand in
+                print("Parsed subcommand: \(subcommand)")
             }
+        )
+
+        for command in allCommands {
+            let subparser = parser.add(
+                subparser: command.name,
+                overview: command.overview
+            )
+            command.addOptions(to: subparser)
+        }
+
+        var options = CommandLineOptions(parser: parser, subCommand: .noCommand)
+        checkresult: do {
+            let result = try parser.parse(arguments)
+            try binder.fill(parseResult: result, into: &options)
+
+            // In some cases like --version, we already have a subcommand and are thus already done
+            guard case SubCommand.noCommand = options.subCommand else {
+                break checkresult
+            }
+
+            guard
+                let subcommandName = result.subparser(parser),
+                var command = allCommands.first(where: { $0.name == subcommandName })
+            else {
+                throw Error(
+                    underlyingError: NoCommandError(),
+                    argumentParser: parser
+                )
+            }
+
+            try command.fillParseResult(result)
+            options.subCommand = SubCommand.command(command)
         } catch {
             throw Error(underlyingError: error, argumentParser: parser)
         }

Sources/XcodeSimulatorKit/Commands/Command.swift

@@ -0,0 +1,14 @@
+import Foundation
+import SPMUtility
+
+protocol Command {
+    /// Subcommand as it will be written on command-line
+    var name: String { get }
+
+    /// Overview for help
+    var overview: String { get }
+
+    func addOptions(to parser: ArgumentParser)
+    mutating func fillParseResult(_ parseResult: ArgumentParser.Result) throws
+    func run() throws
+}

Sources/XcodeSimulatorKit/Commands/ListDevicesCommand.swift

@@ -1,14 +1,57 @@
 import Foundation
 import SPMUtility
 
-struct ListDevicesCommand {
+struct ListDevicesCommand: Command {
+    let name = "list-devices"
+    let overview = "List available Xcode Simulator devices"
+
+    private let binder = ArgumentBinder<ListDevicesCommand>()
+    private var filteringOptions = FilteringOptions()
+
+    func addOptions(to parser: ArgumentParser) {
+        binder.bind(option: parser.add(
+            option: "--availability",
+            kind: FilteringOptions.Availability.self,
+            usage: "Only list available devices? yes|no|all, defaults to all"
+        ), to: { command, availability in
+            command.filteringOptions.availability = availability
+        })
+    }
+
+    mutating func fillParseResult(_ parseResult: ArgumentParser.Result) throws {
+        try binder.fill(parseResult: parseResult, into: &self)
+    }
+
     func run() throws {
         let allDevices = try Simctl.listDevices()
         for (runtime, devices) in allDevices.devices {
+            let filteredDevices = devices.filter(using: filteringOptions)
+            guard !filteredDevices.isEmpty else {
+                continue
+            }
             print("\(runtime):")
-            for device in devices {
+            for device in filteredDevices {
                 print(" - \(device.name)")
             }
         }
     }
 }
+
+extension FilteringOptions.Availability {
+    func matches(_ availability: Bool) -> Bool {
+        switch (self, availability) {
+        case (.yes, true), (.no, false), (.all, _):
+            return true
+        case (.yes, false), (.no, true):
+            return false
+        }
+    }
+}
+
+extension Sequence where Element == Simctl.Device {
+    func filter(using filteringOptions: FilteringOptions) -> [Simctl.Device] {
+        return filter { device in
+            filteringOptions.availability.matches(device.isAvailable)
+        }
+    }
+}

Sources/XcodeSimulatorKit/XcodeSimulatorTool.swift

@@ -35,8 +35,8 @@ public class XcodeSimulatorTool {
             options.printUsage(on: stdoutStream)
         case .version:
             print("xcode-simulator-tool version 0.1")
-        case .listDevices:
-            try ListDevicesCommand().run()
+        case .command(let command):
+            try command.run()
         }
     }
 }

Tests/xcode-simulator-toolTests/CommandLineOptionsTests.swift

@@ -1,12 +1,16 @@
 
 import XCTest
+import Basic
 import SPMUtility
 @testable import XcodeSimulatorKit
 
 class CommandLineOptionsTests: XCTestCase {
     func testListDevices() throws {
         let options = try CommandLineOptions.parse(commandName: "command", arguments: ["list-devices"])
-        XCTAssertEqual(options.subCommand, .listDevices)
+        guard case let CommandLineOptions.SubCommand.command(command) = options.subCommand else {
+            return XCTFail("Should be parsed as a command")
+        }
+        XCTAssertEqual(command.name, "list-devices")
     }
 
     func testArgumentParser() throws {
@@ -18,4 +22,31 @@ class CommandLineOptionsTests: XCTestCase {
         let result = try parser.parse(["a"])
         XCTAssertEqual(result.subparser(parser), "a")
     }
+
+    func testSubParserWithOptions() throws {
+        let parser = ArgumentParser(commandName: "SomeBinary", usage: "sample parser", overview: "Sample overview")
+        let verboseOption = parser.add(
+            option: "--verbose",
+            shortName: "-v",
+            kind: Bool.self,
+            usage: "Print more information"
+        )
+
+        let fillCupParser = parser.add(subparser: "fill-cup", overview: "Fill cup")
+        let contentOption = fillCupParser.add(
+            option: "--content",
+            kind: String.self,
+            usage: "Specify content to fill cup with"
+        )
+
+        let result = try parser.parse(["--verbose", "fill-cup", "--content", "milk"])
+        guard let foundSubparser = result.subparser(parser) else {
+            return XCTFail("Expected to find a sub parser")
+        }
+        XCTAssertEqual(foundSubparser, "fill-cup")
+        XCTAssertEqual(result.get(contentOption), "milk")
+
+        parser.printUsage(on: stdoutStream)
+        fillCupParser.printUsage(on: stdoutStream)
+    }
 }