Implement Command-line option for displaying targets

src/MSBuild.UnitTests/CommandLineSwitches_Tests.cs

@@ -422,6 +422,47 @@ public void PreprocessSwitchIdentificationTests(string preprocess)
             unquoteParameters.ShouldBeTrue();
         }
 
+        [Theory]
+        [InlineData("targets")]
+        [InlineData("tArGeTs")]
+        [InlineData("ts")]
+        public void TargetsSwitchIdentificationTests(string @switch)
+        {
+            CommandLineSwitches.IsParameterizedSwitch(
+                @switch,
+                out var parameterizedSwitch,
+                out var duplicateSwitchErrorMessage,
+                out var multipleParametersAllowed,
+                out var missingParametersErrorMessage,
+                out var unquoteParameters,
+                out var emptyParametersAllowed).ShouldBeTrue();
+            parameterizedSwitch.ShouldBe(CommandLineSwitches.ParameterizedSwitch.Targets);
+            duplicateSwitchErrorMessage.ShouldBeNull();
+            multipleParametersAllowed.ShouldBeFalse();
+            missingParametersErrorMessage.ShouldBeNull();
+            unquoteParameters.ShouldBeTrue();
+            emptyParametersAllowed.ShouldBeFalse();
+        }
+
+        [Fact]
+        public void TargetsSwitchParameter()
+        {
+            CommandLineSwitches switches = new CommandLineSwitches();
+            MSBuildApp.GatherCommandLineSwitches(new ArrayList() { "/targets:targets.txt" }, switches);
+
+            switches.HaveErrors().ShouldBeFalse();
+            switches[CommandLineSwitches.ParameterizedSwitch.Targets].ShouldBe(new[] { "targets.txt" });
+        }
+
+        [Fact]
+        public void TargetsSwitchDoesNotSupportMultipleOccurrences()
+        {
+            CommandLineSwitches switches = new CommandLineSwitches();
+            MSBuildApp.GatherCommandLineSwitches(new ArrayList() { "/targets /targets" }, switches);
+
+            switches.HaveErrors().ShouldBeTrue();
+        }
+
         [Theory]
         [InlineData("isolate")]
         [InlineData("ISOLATE")]
@@ -894,6 +935,7 @@ public void InvalidToolsVersionErrors()
                                         1,
                                         true,
                                         new StringWriter(),
+                                        new StringWriter(),
                                         false,
                                         warningsAsErrors: null,
                                         warningsAsMessages: null,

src/MSBuild/CommandLineSwitches.cs

@@ -93,6 +93,7 @@ internal enum ParameterizedSwitch
             FileLoggerParameters9,
             NodeReuse,
             Preprocess,
+            Targets,
             WarningsAsErrors,
             WarningsAsMessages,
             BinaryLogger,
@@ -261,6 +262,7 @@ bool emptyParametersAllowed
             new ParameterizedSwitchInfo(  new string[] { "fileloggerparameters9", "flp9" },     ParameterizedSwitch.FileLoggerParameters9,      null,                           false,          "MissingFileLoggerParameterError",     true,   false  ),
             new ParameterizedSwitchInfo(  new string[] { "nodereuse", "nr" },                   ParameterizedSwitch.NodeReuse,                  null,                           false,          "MissingNodeReuseParameterError",      true,   false  ),
             new ParameterizedSwitchInfo(  new string[] { "preprocess", "pp" },                  ParameterizedSwitch.Preprocess,                 null,                           false,          null,                                  true,   false  ),
+            new ParameterizedSwitchInfo(  new string[] { "targets", "ts" },                     ParameterizedSwitch.Targets,                    null,                           false,          null,                                  true,   false  ),
             new ParameterizedSwitchInfo(  new string[] { "warnaserror", "err" },                ParameterizedSwitch.WarningsAsErrors,           null,                           true,           null,                                  true,   true   ),
             new ParameterizedSwitchInfo(  new string[] { "warnasmessage", "nowarn" },           ParameterizedSwitch.WarningsAsMessages,         null,                           true,           "MissingWarnAsMessageParameterError",  true,   false  ),
             new ParameterizedSwitchInfo(  new string[] { "binarylogger", "bl" },                ParameterizedSwitch.BinaryLogger,               null,                           false,          null,                                  true,   false  ),

src/MSBuild/Resources/Strings.resx

@@ -790,6 +790,22 @@ Copyright (C) Microsoft Corporation. All rights reserved.
   <data name="HelpMessage_37_DocsLink" Visibility="Public">
     <value>For more detailed information, see https://aka.ms/msbuild/docs</value>
   </data>
+  <data name="HelpMessage_38_TargetsSwitch" Visibility="Public">
+    <value>  -targets[:file]
+                     Prints a list of available targets without executing the
+                     actual build process. By default the output is written to
+                     the console window. If the path to an output file
+                     is provided that will be used instead.
+                     (Short form: -ts)
+                     Example:
+                       -ts:out.txt
+    </value>
+    <comment>
+      LOCALIZATION: "MSBuild" should not be localized.
+      LOCALIZATION: "-targets" and "-ts" should not be localized.
+      LOCALIZATION: None of the lines should be longer than a standard width console window, eg 80 chars.
+    </comment>
+  </data>
   <data name="InvalidConfigurationFile" Visibility="Public">
     <value>MSBUILD : Configuration error MSB1043: The application could not start. {0}</value>
     <comment>
@@ -1157,6 +1173,10 @@ Copyright (C) Microsoft Corporation. All rights reserved.
     <value>MSBUILD : error MSB1047: File to preprocess to is not valid. {0}</value>
     <comment>{StrBegin="MSBUILD : error MSB1047: "}</comment>
   </data>
+  <data name="TargetsCouldNotBePrinted">
+    <value>MSBUILD : error MSB1059: Targets could not be printed. {0}</value>
+    <comment>{StrBegin="MSBUILD : error MSB1059: "}</comment>
+  </data>
   <!-- MSB1021 and MSB1020 are also used in the engine but their copies do not have the "MSBUILD : " prefix so we must have our own -->
   <data name="LoggerCreationError" UESanitized="true" Visibility="Public">
     <value>MSBUILD : error MSB1021: Cannot create an instance of the logger. {0}</value>
@@ -1232,7 +1252,7 @@ Copyright (C) Microsoft Corporation. All rights reserved.
     <!--
         The command line message bucket is: MSB1001 - MSB1999
 
-        Next error code should be MSB1059.
+        Next error code should be MSB1060.
 
         Don't forget to update this comment after using the new code.
   -->