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some poor initial progress on command trees

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Yaakov 2021-09-25 22:18:03 +10:00
parent fab5d2a902
commit ebe9e17b86
1 changed files with 144 additions and 2 deletions
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146
src/console/Program.cs
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@ -1,12 +1,154 @@
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Threading.Tasks;
using CommandLine;
using CommandLine.Text;
namespace Shamir
{
public class CdnOperations : ICommandSet
{
[Verb("ls", HelpText = "List files on the CDN")]
public class CdnLsOptions
{
}
[Verb("add", HelpText = "Upload a file to the CDN")]
public class CdnAddOptions
{
}
[Verb("mv", HelpText = "Move a file to the CDN")]
public class CdnMvOptions
{
}
public static IEnumerable<Type> VerbOptionTypes
{
get
{
yield return typeof(CdnLsOptions);
yield return typeof(CdnAddOptions);
yield return typeof(CdnMvOptions);
}
}
public ICommand? FindCommand(ReadOnlySpan<string> args)
{
if (args.Length == 0) return null;
var parserResult = Parser.Default.ParseArguments<CdnLsOptions, CdnAddOptions, CdnMvOptions>(args.ToArray());
return parserResult.MapResult<CdnLsOptions, CdnAddOptions, CdnMvOptions, ICommand>(
options => new CdnLsCommand(options),
options => new CdnAddCommand(options),
options => new CdnMvCommand(options),
errors => new HelpTextCommand(parserResult)
);
}
public class CdnLsCommand : ICommand
{
public CdnLsCommand(CdnLsOptions options)
{
}
public ValueTask<int> ExecuteAsync()
{
Console.WriteLine($"Executing: cdn-ls");
return ValueTask.FromResult(0);
}
}
public class CdnAddCommand : ICommand
{
public CdnAddCommand(CdnAddOptions options)
{
}
public ValueTask<int> ExecuteAsync()
{
Console.WriteLine($"Executing: cdn-add");
return ValueTask.FromResult(0);
}
}
public class CdnMvCommand : ICommand
{
public CdnMvCommand(CdnMvOptions options)
{
}
public ValueTask<int> ExecuteAsync()
{
Console.WriteLine($"Executing: cdn-mv");
return ValueTask.FromResult(0);
}
}
public class HelpTextCommand : ICommand
{
public HelpTextCommand(ParserResult<object> result)
{
this.result = result ?? throw new ArgumentNullException(nameof(result));
Debug.Assert(result.Tag == ParserResultType.NotParsed);
}
readonly ParserResult<object> result;
public ValueTask<int> ExecuteAsync()
{
var helpText = HelpText.AutoBuild(result);
Console.Error.WriteLine(helpText);
return ValueTask.FromResult(1);
}
}
}
public interface ICommand
{
ValueTask<int> ExecuteAsync();
}
public interface ICommandSet
{
ICommand? FindCommand(ReadOnlySpan<string> args);
static IEnumerable<Type> VerbOptionTypes { get; }
}
public class CommandTree : ICommandSet
{
IEnumerable<Type> VerbOptionTypes { get; }
public ICommand? FindCommand(ReadOnlySpan<string> args)
{
if (args.Length == 0) return null;
return args[0] switch {
"cdn" => new CdnOperations().FindCommand(args[1..]),
_ => null,
};
}
}
class Program
{
static void Main(string[] args)
public static async Task<int> Main(string[] args)
{
Console.WriteLine("Hello World!");
var tree = new CommandTree();
var command = tree.FindCommand(args);
if (command is null)
{
PrintHelpText(tree);
return 1;
}
return await command.ExecuteAsync();
}
static void PrintHelpText(ICommandSet tree)
{
}
}
}