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Add a method to register the help flag #109

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Add a method to register the help flag #109

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keiichiw
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Fixes #108

@keiichiw
Add helpflag() to Options
39e91de 
When we add a flag with `reqopt()`, the mandatory flag is always
required. This behavior doesn't work well when we want to add a `help`
flag, which should work without the required flag is not specified like
`my_command --help`.

So, let's add `helpflag()` method, which add an optional flag "help"
which will allow `parse()` to skip checking the existence of mandatory
flags.
@keiichiw
Don't use "help" as sample data unrelated to helpflag()
44a2da3 
Since `helpflag()` method was added, we shouldn't use "help" as a
placeholder in tests unrelated to the helpflag() method.
@heroin-moose
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heroin-moose commented Jan 7, 2022 •
edited

This issue also arises with -v or -V flags that used to show program version. So I think it should be a more generic option like

opts.optflagsingle("h", "help", "show help and exit");
opts.optflagsingle("v", "version", "show version info and exit");

or something like this.

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Add a way of adding "help" flag which works with required options
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@keiichiw @heroin-moose