updates help text to incorporate verb aliases

Author: johnjaylward

src/CommandLine/Core/Verb.cs

@@ -9,9 +9,9 @@ namespace CommandLine.Core
 {
     sealed class Verb
     {
-        public Verb(string name, string helpText, bool hidden, bool isDefault, IEnumerable<string> aliases)
+        public Verb(string name, string helpText, bool hidden, bool isDefault, string[] aliases)
         {
-            if ( string.IsNullOrWhiteSpace(name))
+            if (string.IsNullOrWhiteSpace(name))
                 throw new ArgumentNullException(nameof(name));
             Name = name;
 
@@ -29,7 +29,7 @@ public Verb(string name, string helpText, bool hidden, bool isDefault, IEnumerab
 
         public bool IsDefault { get; private set; }
 
-        public IEnumerable<string> Aliases { get; private set; }
+        public string[] Aliases { get; private set; }
 
         public static Verb FromAttribute(VerbAttribute attribute)
         {

src/CommandLine/Text/HelpText.cs

@@ -851,10 +851,10 @@ private IEnumerable<Specification> AdaptVerbsToSpecifications(IEnumerable<Type>
             var optionSpecs = from verbTuple in Verb.SelectFromTypes(types)
                               select
                                   OptionSpecification.NewSwitch(
-                                      string.Empty,
                                       verbTuple.Item1.Name,
+                                      verbTuple.Item1.Aliases.ToDelimitedString(", "),
                                       false,
-                                      verbTuple.Item1.IsDefault?  "(Default Verb) "+verbTuple.Item1.HelpText: verbTuple.Item1.HelpText,  //Default verb
+                                      verbTuple.Item1.IsDefault ? "(Default Verb) " + verbTuple.Item1.HelpText : verbTuple.Item1.HelpText,  //Default verb
                                       string.Empty,
                                       verbTuple.Item1.Hidden);
             if (autoHelp)

src/CommandLine/VerbAttribute.cs

@@ -12,7 +12,7 @@ namespace CommandLine
     //public sealed class VerbAttribute : Attribute
     public class VerbAttribute : Attribute
     {
-        private Infrastructure.LocalizableAttributeProperty helpText;
+        private readonly Infrastructure.LocalizableAttributeProperty helpText;
         private Type resourceType;
 
         /// <summary>
@@ -72,6 +72,6 @@ public Type ResourceType
         /// <summary>
         /// Gets or sets the aliases
         /// </summary>
-        public IEnumerable<string> Aliases { get; private set; }
+        public string[] Aliases { get; private set; }
     }
 }

tests/CommandLine.Tests/Unit/Issue6Tests.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
 using System.Linq;
 using CommandLine.Tests.Fakes;
 using CommandLine.Text;
 using FluentAssertions;
+using Microsoft.FSharp.Core;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -22,26 +25,115 @@ public void Parse_option_with_aliased_verbs(string args, Type expectedArgType)
         {
             var arguments = args.Split(' ');
             object options = null;
+            IEnumerable<Error> errors = null;
             var result = Parser.Default.ParseArguments<AliasedVerbOption1, AliasedVerbOption2>(arguments)
-                .WithParsed((o) => options = o)
+                .WithParsed(o => options = o)
+                .WithNotParsed(o => errors = o)
                ;
+            if (errors != null && errors.Any())
+            {
+                foreach (Error e in errors)
+                {
+                    System.Console.WriteLine(e.ToString());
+                }
+            }
 
             Assert.NotNull(options);
             Assert.Equal(expectedArgType, options.GetType());
         }
 
-        [Verb("move", aliases:new string[] { "mv" })]
+        [Theory]
+        [InlineData("--help", true, new string[]
+            {
+                "copy, cp, cpy    (Default Verb) Copy some stuff",
+                "move, mv",
+                "delete        Delete stuff",
+                "help          Display more information on a specific command.",
+                "version       Display version information.",
+            })]
+        [InlineData("help", true, new string[]
+            {
+                "copy, cp, cpy    (Default Verb) Copy some stuff",
+                "move, mv",
+                "delete        Delete stuff",
+                "help          Display more information on a specific command.",
+                "version       Display version information.",
+            })]
+        [InlineData("move --help", false, new string[]
+            {
+                "-a, --alpha    Required.",
+                "--help         Display this help screen.",
+                "--version      Display version information.",
+            })]
+        [InlineData("mv --help", false, new string[]
+            {
+                "-a, --alpha    Required.",
+                "--help         Display this help screen.",
+                "--version      Display version information.",
+            })]
+        [InlineData("delete --help", false, new string[]
+            {
+                "-b, --beta    Required.",
+                "--help        Display this help screen.",
+                "--version     Display version information.",
+            })]
+        public void Parse_help_option_for_aliased_verbs(string args, bool verbsIndex, string[] expected)
+        {
+            var arguments = args.Split(' ');
+            object options = null;
+            IEnumerable<Error> errors = null;
+            // the order of the arguments here drives the order of the commands shown
+            // in the help message
+            var result = Parser.Default.ParseArguments<
+                                            AliasedVerbOption2,
+                                            AliasedVerbOption1,
+                                            VerbNoAlias
+                                        >(arguments)
+                .WithParsed(o => options = o)
+                .WithNotParsed(o => errors = o)
+               ;
+
+            var message = HelpText.AutoBuild(result,
+                error => error,
+                ex => ex,
+                verbsIndex: verbsIndex
+            );
+
+            string helpMessage = message.ToString();
+            var helps = helpMessage.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries).Skip(2).ToList<string>();
+
+            expected.Length.Should().Be(helps.Count);
+            int i = 0;
+            foreach (var expect in expected)
+            {
+                helps[i].Trim().Should().Be(expect);
+                i++;
+            }
+        }
+
+        [Verb("move", aliases: new string[] { "mv" })]
         public class AliasedVerbOption1
         {
             [Option('a', "alpha", Required = true)]
             public string Option { get; set; }
         }
 
-        [Verb("copy", aliases: new string[] { "cp" })]
+        [Verb("copy",
+            isDefault: true,
+            aliases: new string[] { "cp", "cpy" },
+            HelpText = "Copy some stuff"
+        )]
         public class AliasedVerbOption2
         {
             [Option('a', "alpha", Required = true)]
             public string Option { get; set; }
         }
+
+        [Verb("delete",HelpText = "Delete stuff")]
+        public class VerbNoAlias
+        {
+            [Option('b', "beta", Required = true)]
+            public string Option { get; set; }
+        }
     }
 }