feat: Begins work on supporting toml for configuration.

Sources/CliClient/CliClient.swift

@@ -3,6 +3,8 @@ import DependenciesMacros
 import Foundation
 import ShellClient
 
+// TODO: Drop support for non-json configuration.
+
 public extension DependencyValues {
   var cliClient: CliClient {
     get { self[CliClient.self] }
@@ -38,6 +40,7 @@ public struct CliClient: Sendable {
 
 extension CliClient: DependencyKey {
 
+  // swiftlint:disable function_body_length
   public static func live(
     decoder: JSONDecoder = .init(),
     encoder: JSONEncoder = .init(),
@@ -55,9 +58,10 @@ extension CliClient: DependencyKey {
       var env = env
 
       logger.trace("Loading configuration from: \(url)")
-      try fileClient.loadFile(url, &env, decoder)
-
-      return try .fromEnv(env)
+      guard let config = try fileClient.loadFile(url, &env, decoder) else {
+        return try .fromEnv(env)
+      }
+      return config
 
     } runCommand: { args, quiet, shell in
       @Dependency(\.asyncShellClient) var shellClient
@@ -105,6 +109,8 @@ extension CliClient: DependencyKey {
     }
   }
 
+  // swiftlint:enable function_body_length
+
   public static var liveValue: CliClient {
     .live(env: ProcessInfo.processInfo.environment)
   }