feat: display a list applications that can be used with sendkeys

Fixes #46

.vscode/tasks.json

@@ -0,0 +1,12 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "build",
+      "type": "shell",
+      "command": "swift build"
+    }
+  ]
+}

Sources/SendKeysLib/AppLister.swift

@@ -0,0 +1,59 @@
+import ArgumentParser
+import Cocoa
+import Foundation
+
+class AppLister: ParsableCommand {
+    public static let configuration = CommandConfiguration(
+        commandName: "apps",
+        abstract:
+            "Lists apps that can be used with the send command."
+    )
+
+    struct AppInfo: Hashable {
+        let name: String?
+        let id: String?
+
+        init(name: String?, id: String?) {
+            self.name = name
+            self.id = id
+        }
+
+        static func == (lhs: AppInfo, rhs: AppInfo) -> Bool {
+            return lhs.name == rhs.name && lhs.id == rhs.id
+        }
+
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(self.name)
+            hasher.combine(self.id)
+        }
+    }
+
+    required init() {
+    }
+
+    func run() {
+        let apps = Set(
+            NSWorkspace.shared.runningApplications.filter { app in
+                return app.activationPolicy == .regular
+            }
+            .map { app in
+                return AppInfo(name: app.localizedName, id: app.bundleIdentifier)
+            }
+        )
+        .sorted { a, b in
+            return a.name?.lowercased() ?? "" < b.name?.lowercased() ?? ""
+        }
+
+        let maxLength = apps.reduce(
+            0,
+            { max, info in
+                return info.name?.count ?? 0 > max ? info.name!.count : max
+            })
+
+        apps.forEach { info in
+            print(
+                "\((info.name ?? "-").padding(toLength: maxLength + 4, withPad: " ", startingAt: 0))id:\(info.id ?? "-")"
+            )
+        }
+    }
+}

Sources/SendKeysLib/SendKeysCli.swift

@@ -7,7 +7,7 @@ public struct SendKeysCli: ParsableCommand {
         commandName: "sendkeys",
         abstract: "Command line tool for automating keystrokes and mouse events.",
         version: "0.0.0", /* auto-updated */
-        subcommands: [Sender.self, MousePosition.self, Transformer.self],
+        subcommands: [Sender.self, AppLister.self, MousePosition.self, Transformer.self],
         defaultSubcommand: Sender.self
     )