Output JSON for config.

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>

Author: rgoldberg

Scripts/mas

@@ -97,6 +97,17 @@ try (
 	] |
 	map(select(length > 0)) | if length > 0 then join("\n\n") else empty end
 ) catch ("\u001B[4;31mError:\u001B[0m Invalid data from mas: \(.)\n" | halt_error(1))
+'
+	} 4>&1 5>&2
+	;;
+config)
+	{
+		{ exec "${mas}" "${@}" 3>&1 1>&4 2>&5 } | "${jq}" -r '
+try (
+	(keys_unsorted | map(length) | max) as $max_key_length |
+	to_entries[] |
+	"\(.key) \("▁" * ($max_key_length - (.key | length) + 1)) \(.value)"
+) catch ("\u001B[4;31mError:\u001B[0m Invalid data from mas: \(.)\n" | halt_error(1))
 '
 	} 4>&1 5>&2
 	;;

Sources/mas/Commands/Config.swift

@@ -8,6 +8,9 @@
 internal import ArgumentParser
 private import Darwin
 private import Foundation
+private import JSON
+private import JSONAST
+private import JSONEncoding
 
 extension MAS {
 	/// Outputs mas config & related system info.
@@ -16,24 +19,30 @@ extension MAS {
 			abstract: "Output mas config & related system info",
 		)
 
+		@OptionGroup
+		private var outputFormatOptionGroup: OutputFormatOptionGroup
+
 		func run() {
-			printer.info(
-				"""
-				mas ▁▁▁▁ \(version)
-				slice ▁▁ \(runningSliceArchitecture)
-				slices ▁ \(supportedSliceArchitectures.joined(separator: " "))
-				dist ▁▁▁ \(distribution)
-				origin ▁ \(gitOrigin)
-				rev ▁▁▁▁ \(gitRevision)
-				swift ▁▁ \(swiftVersion)
-				driver ▁ \(swiftDriverVersion)
-				store ▁▁ \(appStoreRegion)
-				region ▁ \(macRegion)
-				macos ▁▁ \(macOSVersion)
-				mac ▁▁▁▁ \(configStringValue("hw.product"))
-				cpu ▁▁▁▁ \(configStringValue("machdep.cpu.brand_string"))
-				arch ▁▁▁ \(configStringValue("hw.machine"))
-				""",
+			outputFormatOptionGroup.info(
+				JSON.encode(
+					KeyValuePairs(
+						dictionaryLiteral:
+						("mas", version),
+						("slice", runningSliceArchitecture),
+						("slices", supportedSliceArchitectures.joined(separator: " ")),
+						("dist", distribution),
+						("origin", gitOrigin),
+						("rev", gitRevision),
+						("swift", swiftVersion),
+						("driver", swiftDriverVersion),
+						("store", appStoreRegion),
+						("region", macRegion),
+						("macos", macOSVersion),
+						("mac", configStringValue("hw.product")),
+						("cpu", configStringValue("machdep.cpu.brand_string")),
+						("arch", configStringValue("hw.machine")),
+					),
+				),
 			)
 		}
 	}
@@ -78,8 +87,10 @@ private var supportedSliceArchitectures: [String] {
 	?? [] // swiftformat:disable:this indent
 }
 
-private var macOSVersion: Substring {
-	ProcessInfo.processInfo.operatingSystemVersionString.dropFirst(8).replacing("Build ", with: "", maxReplacements: 1)
+private var macOSVersion: String {
+	String(
+		ProcessInfo.processInfo.operatingSystemVersionString.dropFirst(8).replacing("Build ", with: "", maxReplacements: 1),
+	)
 }
 
 private func configStringValue(_ name: String) -> String {

Sources/mas/Utilities/JSON/KeyValuePairs+JSONObjectEncodable.swift

@@ -0,0 +1,19 @@
+//
+// KeyValuePairs+JSONObjectEncodable.swift
+// mas
+//
+// Copyright © 2026 mas-cli. All rights reserved.
+//
+
+public import JSONAST
+public import JSONEncoding
+
+extension KeyValuePairs: @retroactive JSONEncodable where Key: CustomStringConvertible, Value: JSONEncodable {}
+
+extension KeyValuePairs: @retroactive JSONObjectEncodable where Key: CustomStringConvertible, Value: JSONEncodable {
+	public func encode(to json: inout JSON.ObjectEncoder<JSON.Key>) {
+		for (key, value) in self {
+			json[JSON.Key(rawValue: String(describing: key))] = value
+		}
+	}
+}