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Today's Topics:
1. Re: Stack minimal dependency specification, or dependency
tree output (Josh Barney)
2. Re: Stack minimal dependency specification, or dependency
tree output (Lyndon Maydwell)
3. Re: Stack minimal dependency specification, or dependency
tree output (Simon Jakobi)
4. Re: The (x:xs) in function parameter is a tuple? (Nan Xiao)
5. Re: Stack minimal dependency specification, or dependency
tree output (Lyndon Maydwell)
6. Re: The (x:xs) in function parameter is a tuple?
(Imants Cekusins)
----------------------------------------------------------------------
Message: 1
Date: Wed, 24 Feb 2016 17:28:52 -0500
From: Josh Barney <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Stack minimal dependency
specification, or dependency tree output
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
> On Feb 24, 2016, at 5:10 PM, Lyndon Maydwell <[email protected]> wrote:
>
> Hi Mark,
>
>
> That would be great, and I have tried that, but there is one issue that
> caused me to take the current approach instead.
>
> The issue is that every change to
>
> * Setup.hs
> * simple-app.cabal
> * stack.yaml
>
> will cause the docker to consider the copy statement
>
> > COPY LICENSE Setup.hs simple-app.cabal stack.yaml /app/
>
> as a fresh checkpoint, and make the cache unusable. Since I've frequently
> changing stack.yaml, and app.cabal, this won't help me much.
>
> Not sure if there's a way around that with this method.
>
> Let me know if I've overlooked something with your approach!
>
>
> - Lyndon
>>
I have found that it works well to use a dummy file that does not change in
order to set up a cache. You can then copy over the real file; preserving the
cached docker layer.
Josh
------------------------------
Message: 2
Date: Thu, 25 Feb 2016 09:33:06 +1100
From: Lyndon Maydwell <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Stack minimal dependency
specification, or dependency tree output
Message-ID:
<CAM5QZtwc39k4RJr52QNGAaenDF898JVVCiiVaPt=xwc_b1d...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Awesome!
I'll give that a go.
Thanks,
- Lyndon
On Thu, Feb 25, 2016 at 9:28 AM, Josh Barney <[email protected]> wrote:
>
>
> > On Feb 24, 2016, at 5:10 PM, Lyndon Maydwell <[email protected]> wrote:
> >
> > Hi Mark,
> >
> >
> > That would be great, and I have tried that, but there is one issue that
> caused me to take the current approach instead.
> >
> > The issue is that every change to
> >
> > * Setup.hs
> > * simple-app.cabal
> > * stack.yaml
> >
> > will cause the docker to consider the copy statement
> >
> > > COPY LICENSE Setup.hs simple-app.cabal stack.yaml /app/
> >
> > as a fresh checkpoint, and make the cache unusable. Since I've
> frequently changing stack.yaml, and app.cabal, this won't help me much.
> >
> > Not sure if there's a way around that with this method.
> >
> > Let me know if I've overlooked something with your approach!
> >
> >
> > - Lyndon
> >>
>
> I have found that it works well to use a dummy file that does not change
> in order to set up a cache. You can then copy over the real file;
> preserving the cached docker layer.
>
> Josh
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
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Message: 3
Date: Wed, 24 Feb 2016 23:55:49 +0100
From: Simon Jakobi <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Stack minimal dependency
specification, or dependency tree output
Message-ID:
<cagtp2siuwhs75hgnhr+8p8llxn3gjzugunn9r-d92adej4r...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Lyndon,
I'd like to see some kind of tree instead, so that when I pre-install the
> dependencies, I can specify a minimal list, rather than a whole slew of
> dependencies that would be pulled in transitively anyway.
There's "stack list-dependencies" but that includes the transitive
dependencies.
You can get the dependency tree (or rather dependency graph) with "stack
dot --external"
"stack dot --external --depth 0" will show only the direct dependencies of
your project.
More stack dot examples:
http://docs.haskellstack.org/en/stable/dependency_visualization/
Cheers,
Simon
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Message: 4
Date: Thu, 25 Feb 2016 07:49:56 +0800
From: Nan Xiao <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] The (x:xs) in function parameter is a
tuple?
Message-ID:
<ca+mhoaow8nr8u04m4jh88xraek5tae4e7bv-y9s0wgpya9w...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Hi all,
Firstly, thanks very much for all responses!
Rein referred "A tuple can have any number of elements", while Graham
referred "There's no "one-ple", or 1-tuple, in Haskell.". So which one
is right? The tuple at least contains 2 elements?
Thanks very much in advance!
Best Regards
Nan Xiao
On Thu, Feb 25, 2016 at 2:37 AM, Graham Gill <[email protected]> wrote:
> Hi Nan, are you just confused about the use of the parentheses "(" and ")"?
>
> (x1,x2), (x1,x2,x3), ... are tuples in Haskell, but (x:xs) is not. (There's
> no "one-ple", or 1-tuple, in Haskell.) In
>
> occurs value [] = 0
> occurs value (x:xs) = (if value == x then 1 else 0) + occurs value xs
>
> the "(" and ")" around "x:xs" are just there for grouping, for operator
> precedence reasons. Function application binds more tightly than ":". If you
> leave the parentheses off, such as in
>
> occurs value x:xs = ...
>
> you'll get a parse error.
>
> Graham
>
>
>
> On 2/24/2016 5:31 AM, Nan Xiao wrote:
>>
>> Hi all,
>>
>> Greetings from me!
>>
>> I am confused about the function parameters and tuple. E.g.:
>>
>> occurs value [] = 0
>> occurs value (x:xs) = (if value == x then 1 else 0) + occurs value xs
>>
>> should we consider (x:xs) as a tuple?
>>
>> Thanks in advance!
>>
>> Best Regards
>> Nan Xiao
>> _______________________________________________
>> Beginners mailing list
>> [email protected]
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
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------------------------------
Message: 5
Date: Thu, 25 Feb 2016 10:58:14 +1100
From: Lyndon Maydwell <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Stack minimal dependency
specification, or dependency tree output
Message-ID:
<cam5qztxmw7qlv9j1x76xqp42bzrwmqsteh4pcm5na4qoooy...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Simon,
> stack dot --external --depth 0
That's exactly what I was first looking for!
Cheers :)
- Lyndon
On Thu, Feb 25, 2016 at 9:55 AM, Simon Jakobi <[email protected]>
wrote:
> Hi Lyndon,
>
> I'd like to see some kind of tree instead, so that when I pre-install the
>> dependencies, I can specify a minimal list, rather than a whole slew of
>> dependencies that would be pulled in transitively anyway.
>
>
> There's "stack list-dependencies" but that includes the transitive
> dependencies.
>
> You can get the dependency tree (or rather dependency graph) with "stack
> dot --external"
>
> "stack dot --external --depth 0" will show only the direct dependencies of
> your project.
>
> More stack dot examples:
> http://docs.haskellstack.org/en/stable/dependency_visualization/
>
> Cheers,
> Simon
>
>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
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Message: 6
Date: Thu, 25 Feb 2016 01:02:02 +0100
From: Imants Cekusins <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] The (x:xs) in function parameter is a
tuple?
Message-ID:
<CAP1qinao7B48OWpT526ck1WdSOCR=t9rk77gip32javbcsm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
My guess is: tuple must contain 2+ elements.
Try to enter (1) in ghci. It is displayed as 1
Parentheses are only recognized as a tuple if there are elements separated
by a comma. Otherwise an expression is assumed.
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