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Help.cs
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Help.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using NDesk.Options;
using CommandLine.OptParse;
using Sep.Git.Tfs.Core;
using Sep.Git.Tfs.Util;
using StructureMap;
using StructureMap.Pipeline;
using StructureMap.Query;
using IContainer = StructureMap.IContainer;
namespace Sep.Git.Tfs.Commands
{
[Pluggable("help")]
[Description("help [command-name]")]
public class Help : GitTfsCommand
{
private readonly TextWriter output;
private readonly GitTfsCommandFactory commandFactory;
private readonly IContainer _container;
public Help(TextWriter output, GitTfsCommandFactory commandFactory, IContainer container)
{
this.output = output;
this.commandFactory = commandFactory;
_container = container;
}
public OptionSet OptionSet
{
get { return new OptionSet(); }
}
public IEnumerable<IOptionResults> ExtraOptions
{
get { return null; }
}
/// <summary>
/// Figures out whether it should show help for git-tfs or for
/// a particular command, and then does that.
/// </summary>
public int Run(IList<string> args)
{
foreach(var arg in args)
{
var command = commandFactory.GetCommand(arg);
if(command != null)
{
return Run(command);
}
else
{
output.WriteLine("Invalid argument: " + arg);
}
}
return Run();
}
/// <summary>
/// Shows help for git-tfs as a whole (i.e. a list of commands).
/// </summary>
public int Run()
{
output.WriteLine("Usage: git-tfs [command] [options]");
foreach(var pair in GetCommandMap())
{
output.Write(" " + pair.Key);
if (pair.Value.Any())
{
output.WriteLine(" (" + string.Join(", ", pair.Value) + ")");
}
else
{
output.WriteLine();
}
}
output.WriteLine(" (use 'git-tfs help [command]' for more information)");
return GitTfsExitCodes.Help;
}
/// <summary>
/// Shows help for a specific command.
/// </summary>
public int Run(GitTfsCommand command)
{
if (command is Help)
return Run();
output.WriteLine("Usage: git-tfs " + GetCommandUsage(command));
// deprecated
var usage = new UsageBuilder();
usage.BeginSection("where options are:");
foreach (var parseHelper in command.GetOptionParseHelpers(_container))
usage.AddOptions(parseHelper);
usage.EndSection();
usage.ToText(output, OptStyle.Unix, true);
//new
command.OptionSet.WriteOptionDescriptions(output);
return GitTfsExitCodes.Help;
}
private Dictionary<string, IEnumerable<string>> GetCommandMap()
{
return (from instance in GetCommandInstances()
where instance.Name != null
orderby instance.Name
select instance.Name)
.ToDictionary(s => s, s => commandFactory.GetAliasesForCommandName(s));
}
private string GetCommandName(GitTfsCommand command)
{
return (from instance in GetCommandInstances()
where instance.ConcreteType == command.GetType()
select instance.Name).Single();
}
private IEnumerable<InstanceRef> GetCommandInstances()
{
return _container.Model
.PluginTypes
.Single(p => p.PluginType == typeof (GitTfsCommand))
.Instances
.Where(i => i != null);
}
private string GetCommandUsage(GitTfsCommand command)
{
var descriptionAttribute =
command.GetType().GetCustomAttributes(typeof (DescriptionAttribute), false).FirstOrDefault() as
DescriptionAttribute;
var commandName = GetCommandName(command);
return (descriptionAttribute != null)
? descriptionAttribute.Description
: commandName + " [options]";
}
}
public interface IHelpHelper
{
int ShowHelp(GitTfsCommand command);
int ShowHelpForInvalidArguments(GitTfsCommand command);
}
public class HelpHelper : IHelpHelper
{
private readonly IContainer _container;
public HelpHelper(IContainer container)
{
_container = container;
}
public int ShowHelp(GitTfsCommand command)
{
return _container.GetInstance<Help>().Run(command);
}
public int ShowHelpForInvalidArguments(GitTfsCommand command)
{
ShowHelp(command);
return GitTfsExitCodes.InvalidArguments;
}
}
}