[Haskell-cafe] Lift data from IO to Validation

[Debasish Ghosh]

Hi -

I am not an experienced Haskell programmer and would like to have some help
with the following problem ..

I am trying to validate a bunch of inputs and found the package
Data.Validation. I am also using Data.Time for date and time. I have a
function like this ..

validateOpenDate :: ZonedTime -> Validation [String] ZonedTime

It's supposed to validate a date for which I need to fetch the current date
and time. I can do that with getZonedTime :: IO ZonedTime. I want to check
if the current time is less than the date time I pass to the function and
return an appropriate Validation.

The question is how do I lift the result from IO into the Validation ? Or
is there any alternative strategy that I should consider for this
validation ? I have a number of other validations which follow the same
strategy but don't have the IO. My final goal is to be able to compose all
these validations applicatively to prepare a final ADT in a smart
constructor.

Any help will be appreciated ..

regards.

-- 
Debasish Ghosh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/haskell-cafe/attachments/20200104/132582e0/attachment.html>