Looks like a lot of the logic for this lives in https://github.com/urfave/cli/blob/main/help.go and the templates in here (unfortunately not exported!) are here: https://github.com/urfave/cli/blob/main/template.go

Use this as an exercise in minimising the diff, that's your challenge - how can you get to near zero red/green lines in the diff here for the documentation output, aiming to only make changes where the existing script is getting it wrong (mostly missing some things I believe).

@akaladarshi : I assume you'll re-request review when you're ready for it to be looked at again.

Very close @akaladarshi, good work so far. I haven't done an in-depth review of the actual code, I'm mainly looking at the output and assuming that the code is good, I'll look over that next.

@rvagg I think I found a minimum solution for this we can directly use the urface cli package for generating, Initially I though we need to print everything (hidden), but this will directly print the correct format value.

     customAppData := func() map[string]interface{} {
		return map[string]interface{}{
			"ExtraInfo": g.app.ExtraInfo,
		}
	}

	cli.HelpPrinterCustom(header, cli.AppHelpTemplate, g.app, customAppData())

@rvagg I think I found a minimum solution for this we can directly use the urface cli package for generating, Initially I though we need to print everything (hidden), but this will directly print the correct format value.

     customAppData := func() map[string]interface{} {
		return map[string]interface{}{
			"ExtraInfo": g.app.ExtraInfo,
		}
	}

	cli.HelpPrinterCustom(header, cli.AppHelpTemplate, g.app, customAppData())

Removed the above change in favour of app.Run(args[]string), because it was not printing the default values of flags. Anyway app.Run internally uses cli.HelpPrinter to print the commands.

Squashed down to a single commit and rebased onto current master in this branch.