From lists0 at freea2a.de  Wed Jun 15 23:39:03 2022
From: lists0 at freea2a.de (Lists0)
Date: Thu, 16 Jun 2022 01:39:03 +0200
Subject: [Haskell-beginners] Invoking ghci with hackage modules
Message-ID: <20220616012615.3072c94c@duin>


Hi all,

a very basic question, that I cannot solve alone:
How do I load modules from hackage into ghci ?
Say, I have a module arrows.hs : 

{-# LANGUAGE Arrows #-}

module Main where
import Control.Arrow
import Control.Monad
import qualified Control.Category as Cat
import Data.List
import Data.Maybe
import System.Random


I get the error in ghci:

% ghci arrows.hs
GHCi, version 8.10.6: https://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Main             ( arrows.hs, interpreted )

arrows.hs:9:1: error:
    Could not find module ‘System.Random’
    Use -v (or `:set -v` in ghci) to see a list of the files searched
for. |
9 | import System.Random
  | ^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.
Prelude> 


System.Random is in the package "random" from hackage, where the other
modules are in the package base.

I cannot find a solution in the doku that works :-(

Thanks for help!


From sylvain at haskus.fr  Thu Jun 16 06:52:03 2022
From: sylvain at haskus.fr (Sylvain Henry)
Date: Thu, 16 Jun 2022 08:52:03 +0200
Subject: [Haskell-beginners] Invoking ghci with hackage modules
In-Reply-To: <20220616012615.3072c94c@duin>
References: <20220616012615.3072c94c@duin>
Message-ID: <9f110887-8ec7-8d21-30b7-e25bf262e13f@haskus.fr>

Hi,

With Stack:

 > stack ghci --resolver=lts-18.28 --package=random arrows.hs

You can use Stack's script feature to specify resolver and packages 
directly in the .hs file. See 
https://www.wespiser.com/posts/2020-02-02-Command-Line-Haskell.html for 
some examples.

Cheers,
Sylvain


On 16/06/2022 01:39, Lists0 wrote:
> Hi all,
>
> a very basic question, that I cannot solve alone:
> How do I load modules from hackage into ghci ?
> Say, I have a module arrows.hs :
>
> {-# LANGUAGE Arrows #-}
>
> module Main where
> import Control.Arrow
> import Control.Monad
> import qualified Control.Category as Cat
> import Data.List
> import Data.Maybe
> import System.Random
>
>
> I get the error in ghci:
>
> % ghci arrows.hs
> GHCi, version 8.10.6: https://www.haskell.org/ghc/  :? for help
> [1 of 1] Compiling Main             ( arrows.hs, interpreted )
>
> arrows.hs:9:1: error:
>      Could not find module ‘System.Random’
>      Use -v (or `:set -v` in ghci) to see a list of the files searched
> for. |
> 9 | import System.Random
>    | ^^^^^^^^^^^^^^^^^^^^
> Failed, no modules loaded.
> Prelude>
>
>
> System.Random is in the package "random" from hackage, where the other
> modules are in the package base.
>
> I cannot find a solution in the doku that works :-(
>
> Thanks for help!
>
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

From yehoshuapw at gmail.com  Thu Jun 16 12:21:09 2022
From: yehoshuapw at gmail.com (=?UTF-8?B?15nXlNeV16nXoiDXldec15o=?=)
Date: Thu, 16 Jun 2022 15:21:09 +0300
Subject: [Haskell-beginners] Invoking ghci with hackage modules
In-Reply-To: <9f110887-8ec7-8d21-30b7-e25bf262e13f@haskus.fr>
References: <20220616012615.3072c94c@duin>
 <9f110887-8ec7-8d21-30b7-e25bf262e13f@haskus.fr>
Message-ID: <CAMcanRWv=4q=Sr72M+rpuNKrdBLaKz6PJskYbv72pCDsxk35xA@mail.gmail.com>

if you're using stack, then indeed, as Sylvain said.
if not, this means that the ghci that is being used, and it's relevant
haskell does not have "random" installed. so for example if this is the
system installed one, install the relevant package with haskell's random
too.

On Thu, Jun 16, 2022 at 9:55 AM Sylvain Henry <sylvain at haskus.fr> wrote:

> Hi,
>
> With Stack:
>
>  > stack ghci --resolver=lts-18.28 --package=random arrows.hs
>
> You can use Stack's script feature to specify resolver and packages
> directly in the .hs file. See
> https://www.wespiser.com/posts/2020-02-02-Command-Line-Haskell.html for
> some examples.
>
> Cheers,
> Sylvain
>
>
> On 16/06/2022 01:39, Lists0 wrote:
> > Hi all,
> >
> > a very basic question, that I cannot solve alone:
> > How do I load modules from hackage into ghci ?
> > Say, I have a module arrows.hs :
> >
> > {-# LANGUAGE Arrows #-}
> >
> > module Main where
> > import Control.Arrow
> > import Control.Monad
> > import qualified Control.Category as Cat
> > import Data.List
> > import Data.Maybe
> > import System.Random
> >
> >
> > I get the error in ghci:
> >
> > % ghci arrows.hs
> > GHCi, version 8.10.6: https://www.haskell.org/ghc/  :? for help
> > [1 of 1] Compiling Main             ( arrows.hs, interpreted )
> >
> > arrows.hs:9:1: error:
> >      Could not find module ‘System.Random’
> >      Use -v (or `:set -v` in ghci) to see a list of the files searched
> > for. |
> > 9 | import System.Random
> >    | ^^^^^^^^^^^^^^^^^^^^
> > Failed, no modules loaded.
> > Prelude>
> >
> >
> > System.Random is in the package "random" from hackage, where the other
> > modules are in the package base.
> >
> > I cannot find a solution in the doku that works :-(
> >
> > Thanks for help!
> >
> > _______________________________________________
> > Beginners mailing list
> > Beginners at haskell.org
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>


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From simon.jakobi at googlemail.com  Thu Jun 16 15:17:50 2022
From: simon.jakobi at googlemail.com (Simon Jakobi)
Date: Thu, 16 Jun 2022 17:17:50 +0200
Subject: [Haskell-beginners] Invoking ghci with hackage modules
In-Reply-To: <20220616012615.3072c94c@duin>
References: <20220616012615.3072c94c@duin>
Message-ID: <CAGtp2SgnETaV2YapPWA6W=EVa721F-z-Z4L12v1Sc8ysR7fHYg@mail.gmail.com>

With cabal repl, you can specify dependencies on Hackage with
--build-depends or -b for short, e.g.

    cabal repl --build-depends random

Am Do., 16. Juni 2022 um 05:19 Uhr schrieb Lists0 <lists0 at freea2a.de>:
>
>
> Hi all,
>
> a very basic question, that I cannot solve alone:
> How do I load modules from hackage into ghci ?
> Say, I have a module arrows.hs :
>
> {-# LANGUAGE Arrows #-}
>
> module Main where
> import Control.Arrow
> import Control.Monad
> import qualified Control.Category as Cat
> import Data.List
> import Data.Maybe
> import System.Random
>
>
> I get the error in ghci:
>
> % ghci arrows.hs
> GHCi, version 8.10.6: https://www.haskell.org/ghc/  :? for help
> [1 of 1] Compiling Main             ( arrows.hs, interpreted )
>
> arrows.hs:9:1: error:
>     Could not find module ‘System.Random’
>     Use -v (or `:set -v` in ghci) to see a list of the files searched
> for. |
> 9 | import System.Random
>   | ^^^^^^^^^^^^^^^^^^^^
> Failed, no modules loaded.
> Prelude>
>
>
> System.Random is in the package "random" from hackage, where the other
> modules are in the package base.
>
> I cannot find a solution in the doku that works :-(
>
> Thanks for help!
>
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners