[Agda] how to run helloworld in agda

John Leo leo at halfaya.org
Wed Dec 9 19:36:29 CET 2015 

Andrea:  Thanks, running cabal install as you suggest did indeed fix the
ghc problem.

Ulf: Thanks as well, I didn't know about your prelude and that does indeed
simplify matters considerably.  It worked beautifully for me.

Kidding aside, Agda is my favorite language and it's great to see some
effort going into the practical side as well.

John

On Wed, Dec 9, 2015 at 10:23 AM, Ulf Norell <ulf.norell at gmail.com> wrote:

> I feel this might be a good time to plug my alternative to the standard
> library. Here's the steps to get hello world running with agda-prelude (
> https://github.com/UlfNorell/agda-prelude):
>
> $ agda --version
> Agda version 2.4.2.4
>
> $ git clone https://github.com/UlfNorell/agda-prelude -b compat-2.4.2
> Cloning into 'agda-prelude'...
> [...]
>
> $ cat Hello.agda
> open import Prelude
> main = putStrLn "Hello World"
>
> $ time agda -c Hello.agda -i. -iagda-prelude/src
> --ghc-flag=agda-prelude/agda-ffi/Agda/FFI.hs
> [...]
> Linking /Users/ulfn/research/scratch/tmp/Hello ...
> user 0m7.155s
>
> $ ./Hello
> Hello World
>
> $ ll Hello
> -rwxr-xr-x  1 ulfn  staff  1981612 Dec  9 19:18 Hello
>
> / Ulf
>
> On Wed, Dec 9, 2015 at 7:17 PM, Andrea Vezzosi <sanzhiyan at gmail.com>
> wrote:
>
>> I guess my instructions were assuming a few things, and the whole
>> process is surely more complicated than it could be.
>>
>> However, have you run "cabal install" from inside
>> "/Users/leo/agda/agda-stdlib-0.11/ffi" ? That should make the Data.FFI
>> module available without specifying include paths to ghc directly.
>>
>> On Wed, Dec 9, 2015 at 6:05 PM, John Leo <leo at halfaya.org> wrote:
>> > I've been following this thread and also had trouble getting hello
>> world to
>> > work even with the advice given so far.  Here's what worked for me.
>> >
>> > My work is in /Users/leo/agda.  Here are the commands with the full
>> paths
>> > for clarity.  First I run
>> >
>> > agda -i/Users/leo/agda -i/Users/leo/agda/agda-stdlib-0.11/src --compile
>> > /users/leo/agda/Hello.agda
>> >
>> > This gives an error:
>> >
>> > Calling: ghc -O -o /Users/leo/agda/Hello -Werror -i/Users/leo/agda
>> -main-is
>> > MAlonzo.Code.Hello /Users/leo/agda/MAlonzo/Code/Hello.hs --make
>> > -fwarn-incomplete-patterns -fno-warn-overlapping-patterns
>> > Compilation error:
>> >
>> > MAlonzo/Code/Foreign/Haskell.hs:4:18:
>> >     Could not find module ‘Data.FFI’
>> >     Use -v to see a list of the files searched for.
>> >
>> > MAlonzo/Code/Foreign/Haskell.hs:5:18:
>> >     Could not find module ‘IO.FFI’
>> >     Use -v to see a list of the files searched for.
>> >
>> > Trying to add FFI as follows does not pass the flag correctly to GHC:
>> >
>> > agda -i/Users/leo/agda -i/Users/leo/agda/agda-stdlib-0.11/src
>> > -i/Users/leo/agda/agda-stdlib-0.11/ffi --compile
>> /users/leo/agda/Hello.agda
>> >
>> > So I had to add it and run ghc manually:
>> >
>> > ghc -O -o /Users/leo/agda/Hello -Werror -i/Users/leo/agda
>> > -i/Users/leo/agda/agda-stdlib-0.11/ffi  -main-is MAlonzo.Code.Hello
>> > /Users/leo/agda/MAlonzo/Code/Hello.hs --make -fwarn-incomplete-patterns
>> > -fno-warn-overlapping-patterns
>> >
>> > This finally worked!  Note that I removed the "module XX where" line
>> from
>> > Hello.agda and it worked in that form.
>> >
>> > I think Agda has to win the award as the serious language which
>> requires the
>> > most work to write hello world.
>> >
>> > John
>> >
>> >
>> > On Wed, Dec 9, 2015 at 7:02 AM, Andrea Vezzosi <sanzhiyan at gmail.com>
>> wrote:
>> >>
>> >> The agda files for the stdlib are going to be in
>> >> "/home/martin/adga2/agda-stadlib/src/" so that's what you should use
>> >> for the -i option.
>> >>
>> >> The haskell library in "/home/martin/adga2/agda-stadlib/ffi/" is
>> >> needed when you compile some program using the MAlonzo haskell
>> >> backend, which is the default one.
>> >>
>> >> If you actually want to run something like an helloworld you have to
>> >> compile it first.
>> >>
>> >> bash$ agda -i/home/martin/adga2/agda-stadlib/ffi/ -i. --compile ag.agda
>> >>
>> >> If you get problems try changing "module ag where" to "module Main
>> where"
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On Wed, Dec 9, 2015 at 3:23 PM, Mandy Martino <tesleft at hotmail.com>
>> wrote:
>> >> > after untar  https://agda.github.io/agda-stdlib
>> >> >
>> >> > into  directory
>> >> > /home/martin/adga2/agda-stadlib
>> >> >
>> >> > cd  ffi
>> >> > cabal install Setup.hs
>> >> >
>> >> > does it mean that the  extracted  file path is the library  path ?
>> >> >
>> >> > /home/martin/adga2/agda-stadlib ?
>> >> >
>> >> > Regards,
>> >> >
>> >> > Martin
>> >> >
>> >> >
>> >> >> Subject: RE: [Agda] how to run helloworld in agda
>> >> >> From: mechvel at botik.ru
>> >> >> To: tesleft at hotmail.com
>> >> >> CC: agda at lists.chalmers.se
>> >> >> Date: Wed, 9 Dec 2015 15:41:17 +0400
>> >> >>
>> >> >> On Wed, 2015-12-09 at 19:11 +0800, Mandy Martino wrote:
>> >> >> > Hi,
>> >> >> >
>> >> >> >
>> >> >> > how to find the path of stdlib after it install ?
>> >> >> >
>> >> >>
>> >> >> For example, I have installed Standard library in
>> >> >>
>> >> >> /home/mechvel/agda/stLib/oct29-2015/src,
>> >> >>
>> >> >> so that this directory contains Algebra.agda, and other .agda files
>> and
>> >> >> subdirectories.
>> >> >> Agda is called as
>> >> >>
>> >> >> agda -c $agdaLibOpt MyProgram.agda
>> >> >>
>> >> >> where $agdaLibOpt is
>> >> >>
>> >> >> -i . -i /home/mechvel/agda/stLib/oct29-2015/src -i
>> /home/mechvel/source
>> >> >>
>> >> >> It lists 3 paths. The last path points to where reside my .agda
>> files
>> >> >> which MyProgram imports.
>> >> >>
>> >> >> ------
>> >> >> Sergei
>> >> >>
>> >> >>
>> >> >> > martin at ubuntu:~/adga2/stdlib/agda-stdlib/ffi$ cat Setup.hs
>> >> >> > import Distribution.Simple
>> >> >> >
>> >> >> >
>> >> >> > main = defaultMain
>> >> >> >
>> >> >> >
>> >> >> > martin at ubuntu:~/adga2/stdlib/agda-stdlib$ ls
>> >> >> > agda-stdlib.agda-lib GenerateEverything.hs LICENCE
>> >> >> > README.md
>> >> >> > AllNonAsciiChars.hs GNUmakefile notes
>> >> >> > Setup.hs
>> >> >> > CHANGELOG Header publish-listings.sh src
>> >> >> > doc index.sh README
>> >> >> > ffi lib.cabal README.agda
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> > Regards,
>> >> >> >
>> >> >> >
>> >> >> > Martin
>> >> >> >
>> >> >> >
>> >> >> > > Subject: Re: [Agda] how to run helloworld in agda
>> >> >> > > From: mechvel at botik.ru
>> >> >> > > To: tesleft at hotmail.com
>> >> >> > > CC: agda at lists.chalmers.se
>> >> >> > > Date: Tue, 8 Dec 2015 21:06:16 +0400
>> >> >> > >
>> >> >> > > On Tue, 2015-12-08 at 16:10 +0800, Mandy Martino wrote:
>> >> >> > > > The interactive mode is no longer supported. Don't complain
>> if it
>> >> >> > > > doesn't work.
>> >> >> > > > Main> :l ag.agda
>> >> >> > > > Checking ag (/home/martin/adga2/ag.agda).
>> >> >> > > > /home/martin/adga2/ag.agda:3,13-25
>> >> >> > > > Failed to find source of module IO.Primitive in any of the
>> >> >> > > > following locations:
>> >> >> > > > /home/martin/adga2/IO/Primitive.agda
>> >> >> > > > /home/martin/adga2/IO/Primitive.lagda
>> >> >> > >
>> >> >> > >
>> >> >> > >
>> >> >> > >
>> /home/martin/.cabal/share/i386-linux-ghc-7.10.1/Agda-2.4.2.3/lib/prim/IO/Primitive.agda
>> >> >> > >
>> >> >> > >
>> >> >> > >
>> >> >> > >
>> /home/martin/.cabal/share/i386-linux-ghc-7.10.1/Agda-2.4.2.3/lib/prim/IO/Primitive.lagda
>> >> >> > > > when scope checking the declaration
>> >> >> > > > open import IO.Primitive using (IO; putStrLn)
>> >> >> > > > Failed.
>> >> >> > > > Main>
>> >> >> > > >
>> >> >> > > > module ag where
>> >> >> > > >
>> >> >> > > > open import IO.Primitive using (IO; putStrLn)
>> >> >> > > > open import Data.String using (toCostring; String)
>> >> >> > > > open import Foreign.Haskell using (Unit)
>> >> >> > > >
>> >> >> > > > main : IO Unit
>> >> >> > > > main = putStrLn (toCostring "Hello, Agda!")
>> >> >> > > >
>> >> >> > >
>> >> >> > > I remove "module ag where" (because this module has `main' in
>> it),
>> >> >> > > and apply
>> >> >> > >
>> >> >> > > agda -c $agdaLibOpt Hello.agda
>> >> >> > >
>> >> >> > > where $agdaLibOpt contains the path to the /src directory of
>> >> >> > > Standard library.
>> >> >> > > This makes the executable file Hello.
>> >> >> > > Then, the command
>> >> >> > >
>> >> >> > > ./Hello
>> >> >> > > prints
>> >> >> > > "Hello, Agda!"
>> >> >> > >
>> >> >> > >
>> >> >> > > > why use open import, but not import
>> >> >> > >
>> >> >> > > After "import Foo",
>> >> >> > >
>> >> >> > > one can write Foo.foo, if foo is defined in Foo module.
>> >> >> > > After
>> >> >> > > import Foo
>> >> >> > > open Foo using (foo)
>> >> >> > >
>> >> >> > > one can write `foo' in the scope.
>> >> >> > > And the line
>> >> >> > >
>> >> >> > > open import Foo using (foo)
>> >> >> > >
>> >> >> > > combines the above lines of `import' and `open'.
>> >> >> > >
>> >> >> > > Regards,
>> >> >> > >
>> >> >> > > ------
>> >> >> > > Sergei
>> >> >> > >
>> >> >> > >
>> >> >> > >
>> >> >> >
>> >> >>
>> >> >>
>> >> >
>> >> > _______________________________________________
>> >> > Agda mailing list
>> >> > Agda at lists.chalmers.se
>> >> > https://lists.chalmers.se/mailman/listinfo/agda
>> >> >
>> >> _______________________________________________
>> >> Agda mailing list
>> >> Agda at lists.chalmers.se
>> >> https://lists.chalmers.se/mailman/listinfo/agda
>> >
>> >
>> _______________________________________________
>> Agda mailing list
>> Agda at lists.chalmers.se
>> https://lists.chalmers.se/mailman/listinfo/agda
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.chalmers.se/pipermail/agda/attachments/20151209/3b67b80e/attachment.html

More information about the Agda mailing list