First commit

Package.swift

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+// swift-tools-version: 5.10
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "tidcli",
+    platforms: [
+        .macOS(.v10_15)
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .executableTarget(
+            name: "tidcli"),
+    ]
+)

Sources/main.swift

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+import Foundation
+import LocalAuthentication
+
+let arguments = CommandLine.arguments
+var promptMessage = "authenticate to proceed"
+if arguments.count > 1 {
+    promptMessage = arguments[1]
+}
+
+let context = LAContext()
+var error: NSError?
+
+if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) {
+    context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: promptMessage) { success, evaluationError in
+        if success {
+            print("Authentication was successful.")
+        } else {
+            print("Authentication failed.")
+        }
+        exit(success ? 0 : 1)
+    }
+} else {
+    print("Touch ID is not available.")
+    exit(1)
+}
+
+// Keep the run loop running to wait for the async authentication callback.
+RunLoop.main.run()

readme.md

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+# Outrageously simple touch ID command line prompter
+
+TouchID CLI (tidcli) simply pops a TouchID prompt.
+It returns an exit code of 0 on success and 1 on failure.
+
+You can use this to embed additional authentication steps into your shell script or the like.
+
+Custom prompt information can be passed as the first argument.
+
+# Building
+
+Build a release binary with swift by running:
+
+`swift build -c release`
+
+The resulting binary will be in the `.build/release` directory as `tidcli`.