[feature request] cron syntax validation

[darwin67]

Issue description

It would be great to have a method like .validate that can validate and check if the syntax of the cron string is correct.

How to reproduce

N/A

Expected behaviour

N/A

Context

I want to store the cron string into the database and use it later for checking purposes. So it would be great if I can do some validation with the string before saving it.

Additional context

N/A

[jmettraux]

Hello,

you can easily achieve that with:

require 'fugit'

class Fugit::Cron
  def self.validate(s)
    !! parse(s)
  end
end

def Fugit.validate_cron(s)
  !! parse_cron(s)
end

p Fugit::Cron.validate('5 * * * * *') # => true
p Fugit::Cron.validate('nada') # => false

p Fugit.validate_cron('5 * * * * *') # => true
p Fugit.validate_cron('nada') # => false

If you have any question or suggestion, they're welcome.

Best regards.

[darwin67]

Thanks!