From ad25bd76715cbb35c0d179d69ffd6167f65c5697 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Wed, 7 Jan 2026 15:39:27 +0000
Subject: [PATCH] feat(cli): add interactive platform selection to `exfig init`

Improves the UX of `exfig init` by:
1. Making the `--platform` argument optional.
2. Prompting the user to select a platform interactively if the argument is missing and the session is TTY.
3. Added `CaseIterable` to `Platform` enum in `ExFigCore` to support listing options.

This resolves the issue where running `exfig init` without arguments would immediately fail with a missing argument error, making it friendlier for new users.
---
 .../Subcommands/GenerateConfigFile.swift      | 38 ++++++++++++++++++-
 Sources/ExFigCore/Platform.swift              |  2 +-
 mise.lock                                     |  5 +++
 mise.toml                                     |  1 +
 4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/Sources/ExFig/Subcommands/GenerateConfigFile.swift b/Sources/ExFig/Subcommands/GenerateConfigFile.swift
index f73039a5..01c741e6 100644
--- a/Sources/ExFig/Subcommands/GenerateConfigFile.swift
+++ b/Sources/ExFig/Subcommands/GenerateConfigFile.swift
@@ -22,13 +22,15 @@ extension ExFigCommand {
         var globalOptions: GlobalOptions
 
         @Option(name: .shortAndLong, help: "Platform: ios or android.")
-        var platform: Platform
+        var platform: Platform?
 
         func run() async throws {
             ExFigCommand.initializeTerminalUI(verbose: globalOptions.verbose, quiet: globalOptions.quiet)
             let ui = ExFigCommand.terminalUI!
 
-            let fileContents: String = switch platform {
+            let selectedPlatform = try resolvePlatform(ui: ui)
+
+            let fileContents: String = switch selectedPlatform {
             case .android:
                 androidConfigFileContents
             case .ios:
@@ -51,6 +53,38 @@ extension ExFigCommand {
             try writeConfigFile(contents: fileContents, to: destination, ui: ui)
         }
 
+        private func resolvePlatform(ui: TerminalUI) throws -> Platform {
+            if let platform {
+                return platform
+            }
+
+            if !TTYDetector.isTTY {
+                throw ExFigError
+                    .custom(errorString: "Missing expected argument '--platform <platform>'")
+            }
+
+            ui.info("Select a platform:")
+            let platforms = Platform.allCases
+            for (index, p) in platforms.enumerated() {
+                ui.info("\(index + 1). \(p.rawValue)")
+            }
+
+            TerminalOutputManager.shared.writeDirect("Enter number or name: ")
+            ANSICodes.flushStdout()
+
+            guard let input = readLine()?.trimmingCharacters(in: .whitespacesAndNewlines) else {
+                throw ExFigError.custom(errorString: "Operation cancelled")
+            }
+
+            if let index = Int(input), index > 0, index <= platforms.count {
+                return platforms[index - 1]
+            } else if let p = Platform(rawValue: input.lowercased()) {
+                return p
+            } else {
+                throw ExFigError.custom(errorString: "Invalid selection")
+            }
+        }
+
         /// Handles existing file: prompts for confirmation and removes if approved.
         /// - Returns: `true` to proceed with overwrite, `false` if user cancelled
         private func handleExistingFile(at destination: String, ui: TerminalUI) throws -> Bool {
diff --git a/Sources/ExFigCore/Platform.swift b/Sources/ExFigCore/Platform.swift
index ebe298ba..f3af2d39 100644
--- a/Sources/ExFigCore/Platform.swift
+++ b/Sources/ExFigCore/Platform.swift
@@ -4,7 +4,7 @@ import Foundation
 ///
 /// ExFig supports exporting to both iOS (Xcode) and Android (Android Studio) projects.
 /// The platform affects naming conventions, output formats, and generated code.
-public enum Platform: String, Sendable {
+public enum Platform: String, Sendable, CaseIterable {
     /// iOS/iPadOS/macOS platform (Xcode projects).
     /// Generates xcassets, Swift extensions for UIKit and SwiftUI.
     case ios
diff --git a/mise.lock b/mise.lock
index e8d8b629..4dc7ba36 100644
--- a/mise.lock
+++ b/mise.lock
@@ -41,6 +41,11 @@ backend = "aqua:apple/pkl"
 "platforms.macos-x64" = { checksum = "sha256:5f62ae7a7a34c15b3a83af17bda8e6b98516953f383a492340d4aa090caaa6d9", url = "https://github.com/apple/pkl/releases/download/0.30.2/pkl-macos-amd64"}
 "platforms.windows-x64" = { checksum = "sha256:19e92aa59bcf4e54963b6e3b419af7e1b939f5793b44f4a08d60bab1217106f4", url = "https://github.com/apple/pkl/releases/download/0.30.2/pkl-windows-amd64.exe"}
 
+[[tools.swift]]
+version = "6.2.3"
+backend = "core:swift"
+"platforms.linux-x64" = { checksum = "blake3:0857a2267c52dc00ff1b59b93530a4316d3f99884744f4f75661fcbbea8a414b"}
+
 [[tools.swiftformat]]
 version = "0.58.7"
 backend = "asdf:swiftformat"
diff --git a/mise.toml b/mise.toml
index cbffebf3..1238464d 100644
--- a/mise.toml
+++ b/mise.toml
@@ -38,6 +38,7 @@ git-cliff = "2.10.1" # Changelog generation
 
 # --- Configuration ---
 pkl = "0.30.2" # Configuration language (for hk.pkl)
+swift = "6.2.3"
 
 # =============================================================================
 # Tasks