Haskell on iPad? (Scheme and Ocaml are there)

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John Velman

18 Jun 2011 18 Jun '11

4:18 p.m.

There are (at least) two Scheme interpreters for iPad at the iTunes store: PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces. There is also an Ocaml app, but I don't know or want to know Ocaml, and the interface looks very unfriendly. I'd really like to have something like this in Haskell, in the "education" pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable? John Velman

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Don Stewart

18 Jun 18 Jun

4:43 p.m.

See e.g. http://www.haskell.org/haskellwiki/IPhone http://www.haskell.org/haskellwiki/IPhone https://github.com/dpp/LispHaskellIPad https://github.com/dpp/LispHaskellIPad On Sat, Jun 18, 2011 at 12:18 PM, John Velman wrote:

...

There are (at least) two Scheme interpreters for iPad at the iTunes store: PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces.

There is also an Ocaml app, but I don't know or want to know Ocaml, and the interface looks very unfriendly.

I'd really like to have something like this in Haskell, in the "education" pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable?

John Velman

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

John Velman

5:46 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

Well, I'm not interested in a lisp interpreter written in Haskell. Nor am I (at the moment) interested in writing an iPad app in Haskell. I changed the subject to clarify. What I would like to see is A Haskell Interpreter on the iPad. To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad. By the way, there are three Scheme interpreters in the iPad app store. In addition to the two I previously mentioned, there is iScheme. - John Velman On Sat, Jun 18, 2011 at 12:43:45PM -0400, Don Stewart wrote:

...

See e.g.

http://www.haskell.org/haskellwiki/IPhone

http://www.haskell.org/haskellwiki/IPhone https://github.com/dpp/LispHaskellIPad

https://github.com/dpp/LispHaskellIPad

On Sat, Jun 18, 2011 at 12:18 PM, John Velman wrote:

...
There are (at least) two Scheme interpreters for iPad at the iTunes store: PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces.

There is also an Ocaml app, but I don't know or want to know Ocaml, and the interface looks very unfriendly.

I'd really like to have something like this in Haskell, in the "education" pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable?

John Velman

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Don Stewart

5:59 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

See also the cloud: http://tryhaskell.org :-) On Sat, Jun 18, 2011 at 1:46 PM, John Velman wrote:

...

Well, I'm not interested in a lisp interpreter written in Haskell. Nor am I (at the moment) interested in writing an iPad app in Haskell.

I changed the subject to clarify.

What I would like to see is A Haskell Interpreter on the iPad.

To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

By the way, there are three Scheme interpreters in the iPad app store. In addition to the two I previously mentioned, there is iScheme.

- John Velman

...
See e.g.

http://www.haskell.org/haskellwiki/IPhone

http://www.haskell.org/haskellwiki/IPhone https://github.com/dpp/LispHaskellIPad

https://github.com/dpp/LispHaskellIPad

On Sat, Jun 18, 2011 at 12:18 PM, John Velman wrote:

...
There are (at least) two Scheme interpreters for iPad at the iTunes

store:

...
PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces.

There is also an Ocaml app, but I don't know or want to know Ocaml, and

On Sat, Jun 18, 2011 at 12:43:45PM -0400, Don Stewart wrote: the

...
...
interface looks very unfriendly.

I'd really like to have something like this in Haskell, in the "education" pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable?

John Velman

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Alexander Solla

6:17 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote:

...

To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward. I bet you could even use Xcode to make a graphical user interface to GHCi.

Jack Henahan

6:27 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny. On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...

On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

MigMit

6:44 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun. Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store — which, by the way, is possible; as there are Scheme interpreters there, why not Haskell? Отправлено с iPhone Jun 18, 2011, в 22:27, Jack Henahan написал(а):

...

I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny.

On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...
On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

John Velman

7:03 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

On Sat, Jun 18, 2011 at 10:44:01PM +0400, MigMit wrote: Well, this is my point. THERE ARE 3 SCHEME INTERPRETERS in the iPad app store. They run on factory iPads, not jailbroken. The GUI for the gambitREPL (Read, Evaluate, Print, Loop) is just like a console. Input a scheme expression. CR. Answer appears, new prompt. In haskell we need to allow for some way to input layout. I don't recall how Hugs handles this, if at all. There are probably 5 or 10 people out there who want to learn functional programming, and they are studying Scheme on their iPads. Or Ocaml. I don't forsee doing production programming ON THE IPAD, but experimenting, testing some functions, and, by the way, learning Haskell. While I'm fantasizing, something like Hugs or ghci with SOE would really be neat. Sorry for shouting :-) John Velman

...

Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun.

Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store — which, by the way, is possible; as there are Scheme interpreters there, why not Haskell?

Отправлено с iPhone

Jun 18, 2011, в 22:27, Jack Henahan написал(а):

...
I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny.

On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...
On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Don Stewart

7:19 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

Oh, Scheme is trivial to implement, when compared with Haskell. So people write it from scratch as a tutorial exercise. Haskell isn't trivial to implement from scratch, so instead we port existing implementations mostly. That means really, porting Hugs or GHC. And you've been pointed at examples. I think people are clearly keen for this, now it is a small matter of programming talent and will. -- Don On Sat, Jun 18, 2011 at 3:03 PM, John Velman wrote:

...

On Sat, Jun 18, 2011 at 10:44:01PM +0400, MigMit wrote:

Well, this is my point. THERE ARE 3 SCHEME INTERPRETERS in the iPad app store.

They run on factory iPads, not jailbroken.

The GUI for the gambitREPL (Read, Evaluate, Print, Loop) is just like a console. Input a scheme expression. CR. Answer appears, new prompt.

In haskell we need to allow for some way to input layout. I don't recall how Hugs handles this, if at all.

There are probably 5 or 10 people out there who want to learn functional programming, and they are studying Scheme on their iPads. Or Ocaml.

I don't forsee doing production programming ON THE IPAD, but experimenting, testing some functions, and, by the way, learning Haskell.

While I'm fantasizing, something like Hugs or ghci with SOE would really be neat.

Sorry for shouting :-)

John Velman

...
Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun.

Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store -- which, by the way, is possible; as there are Scheme interpreters there, why not Haskell?

Отправлено с iPhone

Jun 18, 2011, в 22:27, Jack Henahan написал(а):

...
I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny.

On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...
On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Manuel M T Chakravarty

21 Jun 21 Jun

12:21 a.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

And while we are dreaming, in an iOS port of GHCi (meaning GHCi runs on iOS and doesn't just generate code for it), it would be great to make bytecode persistent — ie, the bytecode that GHCi currently generates internally to interpret programs should be serialized to save and load it. (Note that iOS apps are not allowed to generate binary code, so we wouldn't need the gcc tool chain etc, but just have a stripped down GHCi that generates bytecode only. All pre-compiled libraries that are part of the GHCi app can of course still be native code and load and interact with the interpreter as usual.) Manuel Don Stewart:

...

Oh, Scheme is trivial to implement, when compared with Haskell. So people write it from scratch as a tutorial exercise.

Haskell isn't trivial to implement from scratch, so instead we port existing implementations mostly.

That means really, porting Hugs or GHC. And you've been pointed at examples.

I think people are clearly keen for this, now it is a small matter of programming talent and will.

-- Don

On Sat, Jun 18, 2011 at 3:03 PM, John Velman wrote:

...
On Sat, Jun 18, 2011 at 10:44:01PM +0400, MigMit wrote:

Well, this is my point. THERE ARE 3 SCHEME INTERPRETERS in the iPad app store.

They run on factory iPads, not jailbroken.

The GUI for the gambitREPL (Read, Evaluate, Print, Loop) is just like a console. Input a scheme expression. CR. Answer appears, new prompt.

In haskell we need to allow for some way to input layout. I don't recall how Hugs handles this, if at all.

There are probably 5 or 10 people out there who want to learn functional programming, and they are studying Scheme on their iPads. Or Ocaml.

I don't forsee doing production programming ON THE IPAD, but experimenting, testing some functions, and, by the way, learning Haskell.

While I'm fantasizing, something like Hugs or ghci with SOE would really be neat.

Sorry for shouting :-)

John Velman

...
Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun.

Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store -- which, by the way, is possible; as there are Scheme interpreters there, why not Haskell?

Отправлено с iPhone

Jun 18, 2011, в 22:27, Jack Henahan написал(а):

...
I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny.

On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...
On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Jack Henahan

18 Jun 18 Jun

7:19 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

Oh, wow, I'd never seen gambitREPL, just the (pretty terrible) iScheme. That's pretty neat. It's probably quite doable, then, but the dev would either be forced into Hugs, or they'd have to implement a more portable GHC. Does such a thing exist already? On Jun 18, 2011, at 3:03 PM, John Velman wrote:

...

On Sat, Jun 18, 2011 at 10:44:01PM +0400, MigMit wrote:

Well, this is my point. THERE ARE 3 SCHEME INTERPRETERS in the iPad app store.

They run on factory iPads, not jailbroken.

The GUI for the gambitREPL (Read, Evaluate, Print, Loop) is just like a console. Input a scheme expression. CR. Answer appears, new prompt.

In haskell we need to allow for some way to input layout. I don't recall how Hugs handles this, if at all.

There are probably 5 or 10 people out there who want to learn functional programming, and they are studying Scheme on their iPads. Or Ocaml.

I don't forsee doing production programming ON THE IPAD, but experimenting, testing some functions, and, by the way, learning Haskell.

While I'm fantasizing, something like Hugs or ghci with SOE would really be neat.

Sorry for shouting :-)

John Velman

...
Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun.

Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store — which, by the way, is possible; as there are Scheme interpreters there, why not Haskell?

Отправлено с iPhone

Jun 18, 2011, в 22:27, Jack Henahan написал(а):

...
I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny.

On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote:

...
On Sat, Jun 18, 2011 at 10:46 AM, John Velman wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad.

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward.

I bet you could even use Xcode to make a graphical user interface to GHCi. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Malcolm Wallace

19 Jun 19 Jun

11:14 a.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

On 18 Jun 2011, at 20:19, Jack Henahan wrote:

...

but the dev would either be forced into Hugs, or they'd have to implement a more portable GHC. Does such a thing exist already?

Just as a point of interest, the original nhc compiler was original written for an ARM architecture machine (Acorn Archimedes) with 2Mb of memory. Its successor, nhc98, can be bootstrapped from C sources, and always aimed to be as portable as possible. The project is largely unmaintained now, so there is likely to be some bitrot, but it would probably work OK with some effort. Regards, Malcolm

Tom Murphy

3:44 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

On 6/18/11, Alexander Solla wrote:

...

Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS.

Can you provide a link for info? I don't understand how this would be done. Thanks Tom

Jack Henahan

3:59 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

Well, strictly speaking, GHC only supports self-cross-compilation, id est porting[1], cf. [2]. For more information on cross compilation generally, refer to the wiki page[3]. Does that answer your question, or did you have something else in mind? [1]:http://hackage.haskell.org/trac/ghc/wiki/Building/Porting [2]:http://hackage.haskell.org/trac/ghc/wiki/CrossCompilation [3]:http://en.wikipedia.org/wiki/Cross_compiler On Jun 19, 2011, at 11:44 AM, Tom Murphy wrote:

...

On 6/18/11, Alexander Solla wrote:

...
Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS.

Can you provide a link for info? I don't understand how this would be done.

Thanks Tom

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Alexander Solla

5:49 p.m.

New subject: Haskell *interpreter* on iPad? (Scheme and Ocaml are there)

On Sun, Jun 19, 2011 at 8:44 AM, Tom Murphy wrote:

...

On 6/18/11, Alexander Solla wrote:

...
Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS.

Can you provide a link for info? I don't understand how this would be done.

This was news to me too. I haven't read anything relevant in the GHC manual (but then, I haven't looked for quite a while). I said "apparently", because of the contents of this link: http://www.haskell.org/haskellwiki/IPhone#GHC_as_a_cross_compiler

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participants (8)

Alexander Solla
Don Stewart
Jack Henahan
John Velman
Malcolm Wallace
Manuel M T Chakravarty
MigMit
Tom Murphy