[Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
Chris Heller
hellertime at gmail.com
Fri Sep 14 19:14:30 CEST 2012
You might want to have a look at the time-recurrence package:
http://hackage.haskell.org/package/time-recurrence
For your simple cases you would do something like:
Each second:
starting (UTCTime ...) $ recur secondly
Each minute:
starting (UTCTime ...) $ recur minutely
The rules can get quite a bit more complex than that.
I am the author of time-recurrence, so if you have questions feel free to
ping me.
-Chris
On Fri, Sep 14, 2012 at 6:00 AM, <haskell-cafe-request at haskell.org> wrote:
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> Today's Topics:
>
> 1. Fwd: How Type inference work in presence of Functional
> Dependencies (Dan Doel)
> 2. Re: [ANN] Cumino 0.2 - Now supports pretty indentation
> through stylish-haskell (Brandon Allbery)
> 3. Re: [ANN] Cumino 0.2 - Now supports pretty indentation
> through stylish-haskell (Alfredo Di Napoli)
> 4. ANNOUNCE: Groundhog 0.1.0.1 - high-level database library
> (Boris Lykah)
> 5. Re: ANNOUNCE: Groundhog 0.1.0.1 - high-level database library
> (Tom Murphy)
> 6. Re: Either Monad and Laziness (wren ng thornton)
> 7. How do I generate random numbers using random-fu, with
> platform-agnostic code? (Andrew Pennebaker)
> 8. Is Hackage down? (C K Kashyap)
> 9. Re: Is Hackage down? (damodar kulkarni)
> 10. What is the good way to work with list comprehension and
> UTCTime? (Magicloud Magiclouds)
> 11. Re: What is the good way to work with list comprehension and
> UTCTime? (Karl Voelker)
> 12. Re: [ANN] Cumino 0.2 - Now supports pretty indentation
> through stylish-haskell (Alfredo Di Napoli)
> 13. Re: Is Hackage down? (John Wiegley)
> 14. Re: [ANN] Cumino 0.2 - Now supports pretty indentation
> through stylish-haskell (Alfredo Di Napoli)
> 15. Re: What is the good way to work with list comprehension and
> UTCTime? (Roman Cheplyaka)
> 16. Re: What is the good way to work with list comprehension and
> UTCTime? (Magicloud Magiclouds)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 13 Sep 2012 10:44:17 -0400
> From: Dan Doel <dan.doel at gmail.com>
> Subject: [Haskell-cafe] Fwd: How Type inference work in presence of
> Functional Dependencies
> To: Haskell Caf? List <haskell-cafe at haskell.org>
> Message-ID:
> <
> CAHEA9tPsGTUX4Ke9eGCpA+-f_b_Ky9--y6RZkHPAmN9LW8MxHA at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Copying the mailing list, because I forgot.
>
> On Thu, Sep 13, 2012 at 5:18 AM, satvik chauhan <mystic.satvik at gmail.com>
> wrote:
> > Consider the code below :
> >
> > {-# LANGUAGE
> >
> MultiParamTypeClasses,FlexibleInstances,FunctionalDependencies,UndecidableInstances,FlexibleContexts
> > #-}
> > class Foo a c | a -> c
> > instance Foo Int Float
> > f :: (Foo Int a) => Int -> a
> > f = undefined
> >
> > Now when I see the inferred type of f in ghci
> >
> >> :t f
> >
> >> f :: Int -> Float
> >
> > Now If I add the following code
> >
> > g :: Int -> Float
> > g = undefined
> >
> > h :: (Foo Int a) => Int -> a
> > h = g
> >
> >
> > I get the error
> >
> > Could not deduce (a ~ Float)
> >
> >
> > I am not able to understand what has happened here ? The restriction "Foo
> > Int a" should have restricted the type of h to "Int -> Float" as shown in
> > the inferred type of f.
>
> The answer, I believe, is that the difference between the fundep
> implementation and type families is local constraint information.
> Fundeps do no local propagation.
>
> So in your first definition, you've locally provided 'Int -> a', which
> is acceptable to GHC. Then it figures out externally to the function
> that '(Foo Int a) => Int -> a' is actually Int -> Float.
>
> In the second definition, you're trying to give 'Int -> Float', but
> GHC only knows locally that you need to provide 'Int -> a' with a
> constraint 'Foo Int a' which it _won't_ use to determine that a ~
> Float.
>
> This is not inherent to fundeps. One could make a version of fundeps
> that has the local constraint rules (easily so by translating to the
> new type families stuff). But, the difference is also the reason that
> overlapping instances are supported for fundeps and not type families.
> But I won't get into that right now.
>
> -- Dan
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 13 Sep 2012 11:20:51 -0400
> From: Brandon Allbery <allbery.b at gmail.com>
> Subject: Re: [Haskell-cafe] [ANN] Cumino 0.2 - Now supports pretty
> indentation through stylish-haskell
> To: Alfredo Di Napoli <alfredo.dinapoli at gmail.com>
> Cc: Ray <i at maskray.tk>, haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <CAKFCL4WAtx6R0NVtP7nxnj1ZFp=
> KHDx1dGeO-s9EsG4H9nMsvQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> On Thu, Sep 13, 2012 at 2:22 AM, Alfredo Di Napoli <
> alfredo.dinapoli at gmail.com> wrote:
>
> > urxvtc -e sh -c 'echo a'
> >> xterm -e echo a
> >>
> >
> > I would like to, and in fact I've already tried, but urxvt is trickier
> > than other shells. Using the command you gave me does not create a new
> > window, tested both on XMonad and Gnome. This is
> > the error you can see using the option "-hold", this way:
> >
> > urxvt --hold -e "echo a"
> >
> > This opens a new window with the error: *urxvt: Unable to exec child.
> > *
> >
>
> I think you misunderstood; as I read it (and as I would expect it to work
> given the above descrtiption) that would be
>
> urxvt --hold -e sh -c 'echo a'
>
> --
> brandon s allbery allbery.b at gmail.com
> wandering unix systems administrator (available) (412) 475-9364 vm/sms
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> ------------------------------
>
> Message: 3
> Date: Thu, 13 Sep 2012 18:16:06 +0200
> From: Alfredo Di Napoli <alfredo.dinapoli at gmail.com>
> Subject: Re: [Haskell-cafe] [ANN] Cumino 0.2 - Now supports pretty
> indentation through stylish-haskell
> To: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID: <20120913161604.GA31344 at gmail.com>
> Content-Type: text/plain; charset=utf-8
>
> If I remember correctly, I've also tried that combinations, without
> success.
>
> Anyway, I'm not at work so I can't test Cumino against gnome and Xmonad
> until tomorrow morning: I'll keep you posted!
>
> Bye,
> Alfredo
>
> >
> > I think you misunderstood; as I read it (and as I would expect it to work
> > given the above descrtiption) that would be
> >
> > urxvt --hold -e sh -c 'echo a'
> >
> > --
> > brandon s allbery
> allbery.b at gmail.com
> > wandering unix systems administrator (available) (412) 475-9364vm/sms
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 13 Sep 2012 21:23:09 +0300
> From: Boris Lykah <lykahb at gmail.com>
> Subject: [Haskell-cafe] ANNOUNCE: Groundhog 0.1.0.1 - high-level
> database library
> To: haskell-cafe at haskell.org
> Message-ID:
> <CADgh=
> y_wwN0-AwWjoMBvERY0XpgByCoMeuxZ1SegVKXinRV4-A at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I am happy to announce a new version of Groundhog, a library for fast
> high-level database access:
> http://hackage.haskell.org/package/groundhog
> http://hackage.haskell.org/package/groundhog-th
> http://hackage.haskell.org/package/groundhog-postgresql
> http://hackage.haskell.org/package/groundhog-sqlite
>
> Groundhog has been completely overhauled since the last release.
> Notably, it got support for PostgreSQL and natural foreign keys. I
> believe that it is a big step forward as this brings more flexibility
> to the design of the relational schemas while keeping the applications
> independent of the storage layer. Some of the solutions, particularly
> schema migration were based on Persistent code.
>
> Please see examples at
> http://github.com/lykahb/groundhog/tree/master/examples.
>
> Features:
> * Support for Sqlite and PostgreSQL.
> * Natural and composite foreign keys. Earlier it was possible to
> reference an entity only by the mandatory integer primary key. Now an
> entity can have several keys including autoincrement primary key
> (optional) and unique keys which have one or more columns.
> * Full support of embedded datatypes. You can access a field that
> contains an embedded datatype as a whole, or access some of the inner
> subfields individually. This powerful mechanism has allowed
> implementation of the composite keys, and can be used in future to
> work with PostgreSQL composite types or MongoDB embedded documents.
> Instead of serializing value to string, the Groundhog backends flatten
> tree of embedded datatypes to db columns.
> * Projections. You can choose what columns to query from a table in a
> type-safe manner.
> * Initialization and migration of database schema.
> * Sum types and polymorphic types.
> * Expression DSL for use in queries.
> * Basic list support.
> * YAML-based settings mechanism. It separates datatype definition and
> description which facilitates modularity. The settings are inferred
> from the analysis of the difinition, and overridden with values set by
> user.
>
> The Criterion benchmarks are available at
> http://lykahb.github.com/groundhog/SqliteBench.html and
> http://lykahb.github.com/groundhog/PostgreSQLBench.html.
>
> Future plans:
> * Support for joins
> * Database indexes
> * Investigate options for implementing MongoDB and MySQL backends
>
> Your feedback, suggestions for improvement and criticism are welcome.
>
> --
> Regards,
> Boris
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 13 Sep 2012 18:28:34 -0400
> From: Tom Murphy <amindfv at gmail.com>
> Subject: Re: [Haskell-cafe] ANNOUNCE: Groundhog 0.1.0.1 - high-level
> database library
> To: Boris Lykah <lykahb at gmail.com>
> Cc: haskell-cafe at haskell.org
> Message-ID:
> <
> CAO9Q0tU187QkJL5UHyL3A6WvQpOhPWHHTHrMeoWYhOTcWEzHqg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> How does this compare with other high-level Haskell db libraries?
>
> Tom
> On Sep 13, 2012 2:25 PM, "Boris Lykah" <lykahb at gmail.com> wrote:
>
> > I am happy to announce a new version of Groundhog, a library for fast
> > high-level database access:
> > http://hackage.haskell.org/package/groundhog
> > http://hackage.haskell.org/package/groundhog-th
> > http://hackage.haskell.org/package/groundhog-postgresql
> > http://hackage.haskell.org/package/groundhog-sqlite
> >
> > Groundhog has been completely overhauled since the last release.
> > Notably, it got support for PostgreSQL and natural foreign keys. I
> > believe that it is a big step forward as this brings more flexibility
> > to the design of the relational schemas while keeping the applications
> > independent of the storage layer. Some of the solutions, particularly
> > schema migration were based on Persistent code.
> >
> > Please see examples at
> > http://github.com/lykahb/groundhog/tree/master/examples.
> >
> > Features:
> > * Support for Sqlite and PostgreSQL.
> > * Natural and composite foreign keys. Earlier it was possible to
> > reference an entity only by the mandatory integer primary key. Now an
> > entity can have several keys including autoincrement primary key
> > (optional) and unique keys which have one or more columns.
> > * Full support of embedded datatypes. You can access a field that
> > contains an embedded datatype as a whole, or access some of the inner
> > subfields individually. This powerful mechanism has allowed
> > implementation of the composite keys, and can be used in future to
> > work with PostgreSQL composite types or MongoDB embedded documents.
> > Instead of serializing value to string, the Groundhog backends flatten
> > tree of embedded datatypes to db columns.
> > * Projections. You can choose what columns to query from a table in a
> > type-safe manner.
> > * Initialization and migration of database schema.
> > * Sum types and polymorphic types.
> > * Expression DSL for use in queries.
> > * Basic list support.
> > * YAML-based settings mechanism. It separates datatype definition and
> > description which facilitates modularity. The settings are inferred
> > from the analysis of the difinition, and overridden with values set by
> > user.
> >
> > The Criterion benchmarks are available at
> > http://lykahb.github.com/groundhog/SqliteBench.html and
> > http://lykahb.github.com/groundhog/PostgreSQLBench.html.
> >
> > Future plans:
> > * Support for joins
> > * Database indexes
> > * Investigate options for implementing MongoDB and MySQL backends
> >
> > Your feedback, suggestions for improvement and criticism are welcome.
> >
> > --
> > Regards,
> > Boris
> >
> > _______________________________________________
> > Haskell-Cafe mailing list
> > Haskell-Cafe at haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
> >
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> ------------------------------
>
> Message: 6
> Date: Fri, 14 Sep 2012 01:29:32 +0200
> From: wren ng thornton <wren at freegeek.org>
> Subject: Re: [Haskell-cafe] Either Monad and Laziness
> To: haskell-cafe at haskell.org
> Message-ID: <50526C5C.40506 at freegeek.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 9/12/12 5:37 PM, Francesco Mazzoli wrote:
> > At Wed, 12 Sep 2012 12:04:31 -0300,
> > Eric Velten de Melo wrote:
> >> It would be really awesome, though, if it were possible to use a
> >> parser written in Parsec with this, in the spirit of avoiding code
> >> rewriting and enhancing expressivity and abstraction.
> >
> > There is <http://hackage.haskell.org/package/attoparsec-conduit> and
> > <http://hackage.haskell.org/package/attoparsec-enumerator>, which turn
> > attoparsec parsers into enumerators/conduits, and
> > <http://hackage.haskell.org/package/attoparsec-parsec>, which is a
> compatibility
> > layer between attoaparsec and parsec. Good luck :).
>
> Not to mention attoparsec-iteratee, for the iteratee minded folks:
>
> http://hackage.haskell.org/package/attoparsec-iteratee
>
>
> --
> Live well,
> ~wren
>
>
>
> ------------------------------
>
> Message: 7
> Date: Thu, 13 Sep 2012 20:04:49 -0400
> From: Andrew Pennebaker <andrew.pennebaker at gmail.com>
> Subject: [Haskell-cafe] How do I generate random numbers using
> random-fu, with platform-agnostic code?
> To: Haskell Cafe <haskell-cafe at haskell.org>
> Message-ID:
> <CAHXt_SUvif47+r1gV32hKoQTQCw1yfv2i=
> DYKggntLViDxnXUA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I can't figure out how to use Data.Random.Source.IO to generate random
> numbers in a multiplatform way.
>
> I can generate random numbers in Unix using Data.Random.Source.DevRandom,
> and there is an example in the GitHub documentation for Windows using
> Data.Random.Source.MWC, but there is no example code for using
> Data.Random.Source.IO.
>
> Cheers,
>
> Andrew Pennebaker
> www.yellosoft.us
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> ------------------------------
>
> Message: 8
> Date: Fri, 14 Sep 2012 10:33:40 +0530
> From: C K Kashyap <ckkashyap at gmail.com>
> Subject: [Haskell-cafe] Is Hackage down?
> To: Haskell Cafe <haskell-cafe at haskell.org>
> Message-ID:
> <
> CAGdT1gpVt10WoEkOr8tSiunOxfaPN4rk5V2KskAufztcqSa6Cw at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Is it just me or is Hackage indeed been going down more frequently of late?
>
> Regards,
> Kashyap
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> ------------------------------
>
> Message: 9
> Date: Fri, 14 Sep 2012 10:38:55 +0530
> From: damodar kulkarni <kdamodar2000 at gmail.com>
> Subject: Re: [Haskell-cafe] Is Hackage down?
> To: C K Kashyap <ckkashyap at gmail.com>
> Cc: Haskell Cafe <haskell-cafe at haskell.org>
> Message-ID:
> <CAD5Hsyoxt-BqeBOXthp4YA_xm=+
> A0tc-27TKS7CcYYfyrOF1AA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> It shows hackage down:
> http://www.downforeveryoneorjustme.com/http://hackage.haskell.org/
>
> - damodar
>
> On Fri, Sep 14, 2012 at 10:33 AM, C K Kashyap <ckkashyap at gmail.com> wrote:
>
> > Is it just me or is Hackage indeed been going down more frequently of
> late?
> >
> > Regards,
> > Kashyap
> >
> >
> > _______________________________________________
> > Haskell-Cafe mailing list
> > Haskell-Cafe at haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
> >
> >
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> ------------------------------
>
> Message: 10
> Date: Fri, 14 Sep 2012 13:29:52 +0800
> From: Magicloud Magiclouds <magicloud.magiclouds at gmail.com>
> Subject: [Haskell-cafe] What is the good way to work with list
> comprehension and UTCTime?
> To: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <CABErt4f8iN5Ozv7_dbTPDn6ZVp=
> 4ghf+bcm8f72O1RifBJnLpA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Hi,
> Simple usage, I could make an instance of Enum to UTCTime, so
> [utcTime..] could work. But that is so stiff. How if sometimes I want
> to step by 1 min, sometimes I want to step by 1 sec?
> So I think some way like [ t | addUTCTime last 60 ] could be nice.
> But I cannot figure it out....
> Any idea?
> --
> ???????
> ???????
>
> And for G+, please use magiclouds#gmail.com.
>
>
>
> ------------------------------
>
> Message: 11
> Date: Thu, 13 Sep 2012 23:04:51 -0700
> From: Karl Voelker <ktvoelker at gmail.com>
> Subject: Re: [Haskell-cafe] What is the good way to work with list
> comprehension and UTCTime?
> To: Magicloud Magiclouds <magicloud.magiclouds at gmail.com>
> Cc: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <
> CAFfow0zQc43kEgZkVdsD9Wr6PZJfEoLajPdiCRG5cjbEfOarFg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Thu, Sep 13, 2012 at 10:29 PM, Magicloud Magiclouds <
> magicloud.magiclouds at gmail.com> wrote:
>
> > Hi,
> > Simple usage, I could make an instance of Enum to UTCTime, so
> > [utcTime..] could work. But that is so stiff. How if sometimes I want
> > to step by 1 min, sometimes I want to step by 1 sec?
> > So I think some way like [ t | addUTCTime last 60 ] could be nice.
> > But I cannot figure it out....
> > Any idea?
> >
>
> Try using Prelude.iterate.
>
> -Karl
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> ------------------------------
>
> Message: 12
> Date: Fri, 14 Sep 2012 06:14:11 +0000
> From: Alfredo Di Napoli <alfredo.dinapoli at gmail.com>
> Subject: Re: [Haskell-cafe] [ANN] Cumino 0.2 - Now supports pretty
> indentation through stylish-haskell
> To: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <
> CAFqA6+X-0LTOir4i+oOGqiu64cqR_ayrgGnj-P+K2V+FrUcOJw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Ok, I've added the support for urxvt.
> Bear in mind that it partially support urxvt, though: it works fine if you
> run GVim or Vim outside an already running tmux session, otherwise it won't
> start.
> The problem is due to the fact urxvt believes that the new session is
> launched within the running tmux session, whining about nested tmux session
> and not starting at all.
> You can unset the $TERM variable as workaround, but I don't like that
> apporach.
> If you come up with an alternative solution please let me know :)
> A.
>
> On 13 September 2012 16:16, Alfredo Di Napoli <alfredo.dinapoli at gmail.com
> >wrote:
>
> > If I remember correctly, I've also tried that combinations, without
> > success.
> >
> > Anyway, I'm not at work so I can't test Cumino against gnome and Xmonad
> > until tomorrow morning: I'll keep you posted!
> >
> > Bye,
> > Alfredo
> >
> > >
> > > I think you misunderstood; as I read it (and as I would expect it to
> work
> > > given the above descrtiption) that would be
> > >
> > > urxvt --hold -e sh -c 'echo a'
> > >
> > > --
> > > brandon s allbery
> > allbery.b at gmail.com
> > > wandering unix systems administrator (available) (412)
> 475-9364vm/sms
> >
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> ------------------------------
>
> Message: 13
> Date: Fri, 14 Sep 2012 01:21:03 -0500
> From: "John Wiegley" <johnw at newartisans.com>
> Subject: Re: [Haskell-cafe] Is Hackage down?
> To: haskell-cafe at haskell.org
> Message-ID: <m2k3vx86r4.fsf at newartisans.com>
> Content-Type: text/plain
>
> >>>>> C K Kashyap <ckkashyap at gmail.com> writes:
>
> > Is it just me or is Hackage indeed been going down more frequently of
> late?
>
> It's not just you.
>
>
>
>
> ------------------------------
>
> Message: 14
> Date: Fri, 14 Sep 2012 06:50:07 +0000
> From: Alfredo Di Napoli <alfredo.dinapoli at gmail.com>
> Subject: Re: [Haskell-cafe] [ANN] Cumino 0.2 - Now supports pretty
> indentation through stylish-haskell
> To: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <CAFqA6+WT-0Wfv=
> 7DcvBbNuBzxk7tDkcaaf8ERD78q4VucqGGtA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Sorry the typo, the variable is $TMUX and controls the nesting ot tmux
> session. It turns out that if affect not only urxvt but also xterm and
> gnome-terminal.
> Perhaps it could be useful to unset it programmatically, I'll keep you
> posted if I find a workaround.
>
> A.
>
> On 14 September 2012 06:14, Alfredo Di Napoli <alfredo.dinapoli at gmail.com
> >wrote:
>
> > Ok, I've added the support for urxvt.
> > Bear in mind that it partially support urxvt, though: it works fine if
> you
> > run GVim or Vim outside an already running tmux session, otherwise it
> won't
> > start.
> > The problem is due to the fact urxvt believes that the new session is
> > launched within the running tmux session, whining about nested tmux
> session
> > and not starting at all.
> > You can unset the $TERM variable as workaround, but I don't like that
> > apporach.
> > If you come up with an alternative solution please let me know :)
> > A.
> >
> >
> > On 13 September 2012 16:16, Alfredo Di Napoli <
> alfredo.dinapoli at gmail.com>wrote:
> >
> >> If I remember correctly, I've also tried that combinations, without
> >> success.
> >>
> >> Anyway, I'm not at work so I can't test Cumino against gnome and Xmonad
> >> until tomorrow morning: I'll keep you posted!
> >>
> >> Bye,
> >> Alfredo
> >>
> >> >
> >> > I think you misunderstood; as I read it (and as I would expect it to
> >> work
> >> > given the above descrtiption) that would be
> >> >
> >> > urxvt --hold -e sh -c 'echo a'
> >> >
> >> > --
> >> > brandon s allbery
> >> allbery.b at gmail.com
> >> > wandering unix systems administrator (available) (412)
> 475-9364vm/sms
> >>
> >
> >
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>
> ------------------------------
>
> Message: 15
> Date: Fri, 14 Sep 2012 10:03:01 +0200
> From: Roman Cheplyaka <roma at ro-che.info>
> Subject: Re: [Haskell-cafe] What is the good way to work with list
> comprehension and UTCTime?
> To: Magicloud Magiclouds <magicloud.magiclouds at gmail.com>
> Cc: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <
> CAD+QkRoxe0TuwrO3VayE78emfVFFz_rv1RdE+oaX1xanpqpyKg at mail.gmail.com>
> Content-Type: text/plain; charset="gb2312"
>
> Consider using the time-lens package.
>
> import Data.Time.Lens
> import Data.Lens.Common
>
> List comprehension style:
>
> [modL seconds (+ fromIntegral n) t | n <- [0..]]
> [modL minutes (+ n) t | n <- [0..]]
>
> (you need fromIntegral for seconds, because it is of fractional type in
> Data.Time).
>
> iterate style, as suggested by Karl:
>
> iterate (seconds ^+= 1) t
> iterate (minutes ^+= 1) t
>
> On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds <
> magicloud.magiclouds at gmail.com> wrote:
>
> > Hi,
> > Simple usage, I could make an instance of Enum to UTCTime, so
> > [utcTime..] could work. But that is so stiff. How if sometimes I want
> > to step by 1 min, sometimes I want to step by 1 sec?
> > So I think some way like [ t | addUTCTime last 60 ] could be nice.
> > But I cannot figure it out....
> > Any idea?
> > --
> > ???????
> > ???????
> >
> > And for G+, please use magiclouds#gmail.com.
> >
> > _______________________________________________
> > Haskell-Cafe mailing list
> > Haskell-Cafe at haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
> >
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>
> ------------------------------
>
> Message: 16
> Date: Fri, 14 Sep 2012 16:25:58 +0800
> From: Magicloud Magiclouds <magicloud.magiclouds at gmail.com>
> Subject: Re: [Haskell-cafe] What is the good way to work with list
> comprehension and UTCTime?
> To: Roman Cheplyaka <roma at ro-che.info>
> Cc: haskell-cafe <haskell-cafe at haskell.org>
> Message-ID:
> <
> CABErt4fEAnEaFjhSjbYDMX7y0jJJkCO8WAq-ToXjGc5xRtGg4A at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> This is nice. Thanks to all.
>
> On Fri, Sep 14, 2012 at 4:03 PM, Roman Cheplyaka <roma at ro-che.info> wrote:
> > Consider using the time-lens package.
> >
> > import Data.Time.Lens
> > import Data.Lens.Common
> >
> > List comprehension style:
> >
> > [modL seconds (+ fromIntegral n) t | n <- [0..]]
> > [modL minutes (+ n) t | n <- [0..]]
> >
> > (you need fromIntegral for seconds, because it is of fractional type in
> > Data.Time).
> >
> > iterate style, as suggested by Karl:
> >
> > iterate (seconds ^+= 1) t
> > iterate (minutes ^+= 1) t
> >
> > On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds
> > <magicloud.magiclouds at gmail.com> wrote:
> >>
> >> Hi,
> >> Simple usage, I could make an instance of Enum to UTCTime, so
> >> [utcTime..] could work. But that is so stiff. How if sometimes I want
> >> to step by 1 min, sometimes I want to step by 1 sec?
> >> So I think some way like [ t | addUTCTime last 60 ] could be nice.
> >> But I cannot figure it out....
> >> Any idea?
> >> --
> >> ???????
> >> ???????
> >>
> >> And for G+, please use magiclouds#gmail.com.
> >>
> >> _______________________________________________
> >> Haskell-Cafe mailing list
> >> Haskell-Cafe at haskell.org
> >> http://www.haskell.org/mailman/listinfo/haskell-cafe
> >
> >
>
>
>
> --
> ???????
> ???????
>
> And for G+, please use magiclouds#gmail.com.
>
>
>
> ------------------------------
>
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
> End of Haskell-Cafe Digest, Vol 109, Issue 19
> *********************************************
>
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