(#513) Re-use existing Config from container

When calling the showconfig command, it was re-hydrating the
configuration file from disk, rather than using the existing
configuration from the IoC container.

This commit changes the associated methods to re-use the existing
Config object, rather than creating it again from scratch.  This has
the result of only showing the Warning about a missing Yaml file once,
and not twice.

src/GitReleaseManager.Core.Tests/Commands/ShowConfigCommandTests.cs

@@ -1,5 +1,7 @@
+using System;
 using System.Threading.Tasks;
 using GitReleaseManager.Core.Commands;
+using GitReleaseManager.Core.Configuration;
 using GitReleaseManager.Core.Helpers;
 using GitReleaseManager.Core.Options;
 using NSubstitute;
@@ -21,7 +23,10 @@ public void Setup()
         {
             _fileSystem = Substitute.For<IFileSystem>();
             _logger = Substitute.For<ILogger>();
-            _command = new ShowConfigCommand(_fileSystem, _logger);
+
+            var currentDirectory = Environment.CurrentDirectory;
+            var configuration = ConfigurationProvider.Provide(currentDirectory, _fileSystem);
+            _command = new ShowConfigCommand(_logger, configuration);
         }
 
         [Test]

src/GitReleaseManager.Core/Commands/ShowConfigCommand.cs

@@ -1,26 +1,24 @@
-using System;
 using System.Threading.Tasks;
 using GitReleaseManager.Core.Configuration;
-using GitReleaseManager.Core.Helpers;
 using GitReleaseManager.Core.Options;
 using Serilog;
 
 namespace GitReleaseManager.Core.Commands
 {
     public class ShowConfigCommand : ICommand<ShowConfigSubOptions>
     {
-        private readonly IFileSystem _fileSystem;
         private readonly ILogger _logger;
+        private readonly Config _config;
 
-        public ShowConfigCommand(IFileSystem fileSystem, ILogger logger)
+        public ShowConfigCommand(ILogger logger, Config config)
         {
-            _fileSystem = fileSystem;
             _logger = logger;
+            _config = config;
         }
 
         public Task<int> ExecuteAsync(ShowConfigSubOptions options)
         {
-            var configuration = ConfigurationProvider.GetEffectiveConfigAsString(options.TargetDirectory ?? Environment.CurrentDirectory, _fileSystem);
+            var configuration = ConfigurationProvider.GetEffectiveConfigAsString(_config);
             _logger.Information("{Configuration}", configuration);
 
             return Task.FromResult(0);

src/GitReleaseManager.Core/Configuration/ConfigurationProvider.cs

@@ -41,9 +41,8 @@ public static Config Provide(string gitDirectory, IFileSystem fileSystem)
             return new Config();
         }
 
-        public static string GetEffectiveConfigAsString(string currentDirectory, IFileSystem fileSystem)
+        public static string GetEffectiveConfigAsString(Config config)
         {
-            var config = Provide(currentDirectory, fileSystem);
             var stringBuilder = new StringBuilder();
             using (var stream = new StringWriter(stringBuilder, CultureInfo.InvariantCulture))
             {