commandlineparser
Display help without requiring ParseArguments
I'm trying to print the help text for my options without having to force a parser error.
Currently, it seems the only way to print the help text is to call something like
Parser.Default.ParseArguments<Options>(new string[] { "verb", "--help" });
I see there's HelpText.AutoBuild but that seems to require a NotParsed result.
Is there a way to write the help text for an options class without having to parse arguments? Maybe something like HelpText.DisplayHelp<Options>?
I also am interested in having the help command not generate an error which creates noise in my logging that is undesirable..
I just noticed this snippet from the HelpTextTests unit test that just creates a fake result. Does this do what you were looking for?
var help = new HelpText { AddDashesToOption = true }
.AddOptions(new NotParsed<Options_With_HelpText_And_MetaValue>(
TypeInfo.Create(typeof(Options_With_HelpText_And_MetaValue)),
Enumerable.Empty<Error>()));
Console.WriteLine(help.ToString());
It doesn't do the Copyright info or project name, but you can call the AddPreOptionsLine method on HelpText to add it in yourself.
@nemec The problem is NotParsed is an internal class so is not available during general usage.
Ah, you're right. I was looking at the class but it's the constructor that's internal.
@Steve887, @nemec
Even though the NotParsed class is internal, you could create an instance by using reflection (although it's questionable if you should do so). I created a gist with an extension method GetAutoBuildHelpText on the ParserResult class that will do exactly the same as the code in the unit test, except for the fact that it'll do this by using reflection.
You can find the gist here: https://gist.github.com/azforeversupporter/82b794ded5d16a390d89eb2071035388
This is still a problem and would make the usage of this library a lot better. I have some business specific validation rules to perform and these business rules are document in the help message. So when the parsed values are invalid, I'd like to give an error message that says what went wrong and display the help/usage. Would love to see this get fixed.
