Add --dry-run argument to dotnet-format

src/Tools/dotnet-format/CodeFormatter.cs

@@ -23,7 +23,7 @@ internal static class CodeFormatter
     {
         private const int MaxLoggedWorkspaceWarnings = 5;
 
-        public static async Task<int> FormatWorkspaceAsync(ILogger logger, string solutionOrProjectPath, bool isSolution, bool logAllWorkspaceWarnings, CancellationToken cancellationToken)
+        public static async Task<int> FormatWorkspaceAsync(ILogger logger, string solutionOrProjectPath, bool isSolution, bool logAllWorkspaceWarnings, bool saveFormattedFiles, CancellationToken cancellationToken)
         {
             logger.LogInformation(string.Format(Resources.Formatting_code_files_in_workspace_0, solutionOrProjectPath));
 
@@ -61,7 +61,7 @@ public static async Task<int> FormatWorkspaceAsync(ILogger logger, string soluti
                 logger.LogTrace(Resources.Workspace_loaded_in_0_ms, workspaceStopwatch.ElapsedMilliseconds);
                 workspaceStopwatch.Restart();
 
-                exitCode = await FormatFilesInWorkspaceAsync(logger, workspace, projectPath, codingConventionsManager, cancellationToken).ConfigureAwait(false);
+                exitCode = await FormatFilesInWorkspaceAsync(logger, workspace, projectPath, codingConventionsManager, saveFormattedFiles, cancellationToken).ConfigureAwait(false);
 
                 logger.LogDebug(Resources.Format_complete_in_0_ms, workspaceStopwatch.ElapsedMilliseconds);
             }
@@ -92,7 +92,7 @@ void LogWorkspaceWarnings(object sender, WorkspaceDiagnosticEventArgs args)
             }
         }
 
-        private static async Task<int> FormatFilesInWorkspaceAsync(ILogger logger, Workspace workspace, string projectPath, ICodingConventionsManager codingConventionsManager, CancellationToken cancellationToken)
+        private static async Task<int> FormatFilesInWorkspaceAsync(ILogger logger, Workspace workspace, string projectPath, ICodingConventionsManager codingConventionsManager, bool saveFormattedFiles, CancellationToken cancellationToken)
         {
             var projectIds = workspace.CurrentSolution.ProjectIds.ToImmutableArray();
             var optionsApplier = new EditorConfigOptionsApplier();
@@ -115,7 +115,7 @@ private static async Task<int> FormatFilesInWorkspaceAsync(ILogger logger, Works
                 logger.LogInformation(Resources.Formatting_code_files_in_project_0, project.Name);
 
                 var formattedSolution = await FormatFilesInProjectAsync(logger, project, codingConventionsManager, optionsApplier, cancellationToken).ConfigureAwait(false);
-                if (!workspace.TryApplyChanges(formattedSolution))
+                if (saveFormattedFiles && !workspace.TryApplyChanges(formattedSolution))
                 {
                     logger.LogError(Resources.Failed_to_save_formatting_changes);
                     return 1;

src/Tools/dotnet-format/Program.cs

@@ -30,13 +30,14 @@ private static async Task<int> Main(string[] args)
                 .UseExceptionHandler()
                 .AddOption(new Option(new[] { "-w", "--workspace" }, Resources.The_solution_or_project_file_to_operate_on_If_a_file_is_not_specified_the_command_will_search_the_current_directory_for_one, new Argument<string>(() => null)))
                 .AddOption(new Option(new[] { "-v", "--verbosity" }, Resources.Set_the_verbosity_level_Allowed_values_are_quiet_minimal_normal_detailed_and_diagnostic, new Argument<string>() { Arity = ArgumentArity.ExactlyOne }.FromAmong(_verbosityLevels)))
+                .AddOption(new Option(new[] { "--dry-run" }, Resources.Format_files_but_do_not_save_changes_to_disk, new Argument<bool>()))
                 .UseVersionOption()
                 .Build();
 
             return await parser.InvokeAsync(args).ConfigureAwait(false);
         }
 
-        public static async Task<int> Run(string workspace, string verbosity, IConsole console = null)
+        public static async Task<int> Run(string workspace, string verbosity, bool dryRun, IConsole console = null)
         {
             var serviceCollection = new ServiceCollection();
             var logLevel = GetLogLevel(verbosity);
@@ -69,6 +70,7 @@ public static async Task<int> Run(string workspace, string verbosity, IConsole c
                     workspacePath,
                     isSolution,
                     logAllWorkspaceWarnings: logLevel == LogLevel.Trace,
+                    saveFormattedFiles: !dryRun,
                     cancellationTokenSource.Token).ConfigureAwait(false);
             }
             catch (FileNotFoundException fex)

src/Tools/dotnet-format/Resources.Designer.cs

@@ -117,6 +117,15 @@ internal class Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Format files, but do not save changes to disk..
+        /// </summary>
+        internal static string Format_files_but_do_not_save_changes_to_disk {
+            get {
+                return ResourceManager.GetString("Format_files_but_do_not_save_changes_to_disk", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Formatting code file &apos;{0}&apos;..
         /// </summary>

src/Tools/dotnet-format/Resources.resx

@@ -180,4 +180,7 @@
   <data name="Maximum_number_of_workspace_warnings_to_log_has_been_reached_Set_the_verbosity_option_to_the_diagnostic_level_to_see_all_warnings" xml:space="preserve">
     <value>Maximum number of workspace warnings to log has been reached. Set the --verbosity option to the 'diagnostic' level to see all warnings.</value>
   </data>
+  <data name="Format_files_but_do_not_save_changes_to_disk" xml:space="preserve">
+    <value>Format files, but do not save changes to disk.</value>
+  </data>
 </root>
\ No newline at end of file

src/Tools/dotnet-format/xlf/Resources.cs.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.de.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.es.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.fr.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.it.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.ja.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.ko.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.pl.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.pt-BR.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.ru.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.tr.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.zh-Hans.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>

src/Tools/dotnet-format/xlf/Resources.zh-Hant.xlf

@@ -32,6 +32,11 @@
         <target state="new">Format complete in {0}ms.</target>
         <note />
       </trans-unit>
+      <trans-unit id="Format_files_but_do_not_save_changes_to_disk">
+        <source>Format files, but do not save changes to disk.</source>
+        <target state="new">Format files, but do not save changes to disk.</target>
+        <note />
+      </trans-unit>
       <trans-unit id="Formatting_code_file_0">
         <source>Formatting code file '{0}'.</source>
         <target state="new">Formatting code file '{0}'.</target>