Make text wrapping API puplic

[h0lg]

When building CLI apps, wrapping large text to fit the Console.WindowWidth is a common requirement. It would be nice if an API like HelpBuilder.WrapText(string text, int maxWidth) would be publicly accessible for reuse.

command-line-api/src/System.CommandLine/Help/HelpBuilder.cs

Line 319 in 436f973

private static IEnumerable<string> WrapText(string text, int maxWidth)

If there's another API to do that, please point me in the right direction, thanks!

[KalleOlaviNiemitalo]

It doesn't currently measure widths correctly (#1973), and fixing that may require lookup tables that would then cause the package to grow more than is desired for some applications.

If a string wrapping API is made public, then I think it should be defined with a delegate, interface, or abstract class, so that

• System.CommandLine provides a simple implementation and uses that by default
• Applications can also call that implementation
• Applications can also provide a more complex implementation (supporting wide characters, emoji, CJK word boundaries without spaces, etc.) and configure System.CommandLine to use that

[h0lg]

Thanks for your input. I understand that before making a text wrapping API public, you suggest waiting for the API changes that the resolution of #1973 will probably have to make. Makes sense.