Flexible argument parsing library and help screen generator
Install-Package ArgParser -Version 1.0.0-rc3
dotnet add package ArgParser --version 1.0.0-rc3
paket add ArgParser --version 1.0.0-rc3
The ArgParser.TestApp program is what is used to create the gif on the root README. You can use it to test your own applications or see how the gif was made.
Most existing libraries in this space do so using attributes and reflection. I find this approach to be restrictive and not conducive to extension. Extension is important because there a seemingly infinite amount of styles for how args should be interpretted.
- switch style
-h,--help,/?,-help,--value=something,value:something
- groupable parameters
git commit -am something
- sub commands
dotnet new
- count switches
-vvv
Provide a framework that allows for the creation of any type of argument parser, and a set of extensions that allow the user to opt into common styles.
It needs to be fairly trivial to create parsers for some of the most commonly used commands: git, find, dotnet along with similar help generation.
using System;
using System.Linq;
using ArgParser.Core;
using ArgParser.Styles;
using ArgParser.Styles.Extensions;
using Figgle;
namespace testnuget
{
class UtilOptions
{
public bool IsHelpRequested { get; set; }
public int SomeValue { get; set; }
}
class Program
{
static void Main(string[] args)
{
new ContextBuilder()
.AddParser<UtilOptions>("util", help =>
{
help
.SetName("utility")
.SetShortDescription("General utility tool");
})
.WithFactoryFunction(() => new UtilOptions())
.WithBooleanSwitch('h', "help", o => o.IsHelpRequested = true)
.WithSingleValueSwitch('v', "value", (o, s) => o.SomeValue = Convert.ToInt32(s), help =>
{
help
.SetName("Some Value")
.SetDefaultValue("1")
.SetShortDescription("Some value for something");
})
.Finish
.RegisterExtensions()
.AddAutoHelp((parseResults, exceptions) =>
{
foreach (var kvp in parseResults)
if (kvp.Key is UtilOptions casted && casted.IsHelpRequested)
return kvp.Value.Id;
var missingValues = exceptions.OfType<MissingValueException>();
var first = missingValues.FirstOrDefault();
return first?.Parser.Id;
})
.SetTheme("util",
Theme.Create(FiggleFonts.Doom, ConsoleColor.Green, ConsoleColor.DarkGreen, ConsoleColor.Yellow, ConsoleColor.Red,
ConsoleColor.Yellow))
.Parse(args)
.When<UtilOptions>((o, p) => {
Console.WriteLine(o.SomeValue);
});
Console.ReadKey();
}
}
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