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Today's Topics:
1. Re: Config data (Mike Houghton)
----------------------------------------------------------------------
Message: 1
Date: Sat, 13 Jun 2015 08:25:05 +0100
From: Mike Houghton <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Config data
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
Hi,
My primary uses case was to set username/passord and server details for an
emailing module.
Using some of the ideas in this email chain I?ve written a small module at
https://github.com/mike-k-houghton/AppConfig
I hope someone might find it useful.
Thanks
> On 6 Jun 2015, at 21:14, Rein Henrichs <[email protected]> wrote:
>
> Can we please not suggest "not recommended" solutions (that most of us
> probably wouldn't use) without at least providing a recommended alternative?
>
> You can parse the config file into a record and then either pass it as an
> argument wherever it is needed or use Reader (or ReaderT) to make it more
> implicit.
> On Sat, Jun 6, 2015 at 12:16 PM Sumit Sahrawat, Maths & Computing, IIT (BHU)
> <[email protected]> wrote:
> Yeah, sorry I missed the last line on my first read.
>
> The link I gave you also explains how to achieve the same functionality as
> global variables without using them.
> The unsafePerformIO hack works, but for small modules it's much more helpful
> to do it safely.
>
> On 7 June 2015 at 00:37, mike h <[email protected]> wrote:
> Global state is an option - thanks. Didn't think Haskell allowed this.
>
> Having three modules may be more logical but doesn't it just put the same
> problem into the new module?
>
> Thanks
>
>
>
> On Saturday, 6 June 2015, 19:43, Mike Houghton <[email protected]>
> wrote:
>
>
> Hi,
>
> I?ve haskell files parser.hs and email.hs
> email.hs is a module imported into parser and parser has the main.
>
> email has various passwords and server names needed to connect and send
> email. I want to have those details in a config file and read it in at start
> - using say config module. I?m ok with this part but the practicality of
> doing it eludes me...
>
> It seems to me that email module can either get the config details itself or
> be told them by parser. If email wants to get them how would it do this? It
> does not have a main that gets run so can?t load a config file.(can it ??)
>
> However parser can load the config in its main and then tell mail what the
> values are but how would mail save them?
>
> Of course I could chanage the signatures of the email send/receive functions
> in mail to take the connection details but that seems wrong.
>
> Thanks
>
> Mike
>
>
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>
>
> --
> Regards
>
> Sumit Sahrawat
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