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Munich Haskell Meeting
by Heinrich Hördegen 25 Apr '14

25 Apr '14

Dear all, next week, our monthly Munich Haskell Meeting is scheduled for the 29th of April, 19h30 Cafe Puck. If you plan to join, please go to http://www.haskell-munich.de/dates and hit the button. Everybody is welcome! Heinrich

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Thoughts on Hakyll vs. Octopress for an experienced Haskeller but HTML newbie
by Joey Eremondi 25 Apr '14

25 Apr '14

Disclaimer: Cross-posted at http://www.reddit.com/r/haskell/comments/23xgzf/thoughts_on_hakyll_vs_octop… I'm starting a personal website/blog, just the typical thing you see a lot of programmers keeping. I'm looking at using Github Pages, but as I don't want to hand-code everything, I'll be using a static site generator. I'm choosing between Hakyll and Octopress, but I wanted to get some opinions before I put in the effort of learning and installing one. I'll start by saying that I'm comfortable with Monads, EDSLs, and Haskell in general. Conversely, I have next to no HTML/CSS skill. What I'm really wondering is, how much hand-HTML does Hakyll require you to do? In particular: 1. Does Hakyll have any support for visual "themes"? If not, are there libraries/examples of visual layouts I could choose from? 2. Does Hakyll integrate well with Github pages? 3. How hard is it to get things like a Facebook like button, twitter sidebar, comments, etc. working in Hakyll? Is there anything equivalent to Octopress's plugins <http://octopress.org/docs/blogging/plugins/>? 4. Octopress advertises itself as dealing well with code snippets. Does Hakyll deal well with code within pages? I realize that many of these things will not be built into Hakyll, so cases where it's not built in but there are lots of easy examples to take from are welcome. Reccomendations of one over the other are welcome, but I'm more looking for feedback and knowledge from people who have used Hakyll (and Octopress, though that's more tangential to this subreddit). Thanks! EDIT: Generalized to "comments" instead of just "disqus comments"

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Monad.Reader #24 call for copy
by Edward Z. Yang 24 Apr '14

24 Apr '14

Call for Copy: The Monad.Reader - Issue 24 -------------------------------------------- Whether you're an established academic or have only just started learning Haskell, if you have something to say, please consider writing an article for The Monad.Reader! The submission deadline for Issue 24 will be: **Saturday, July 5, 2014** The Monad.Reader ~~~~~~~~~~~~~~~~ The Monad.Reader is a electronic magazine about all things Haskell. It is less formal than journal, but somehow more enduring than a wiki- page. There have been a wide variety of articles: exciting code fragments, intriguing puzzles, book reviews, tutorials, and even half-baked research ideas. Submission Details ~~~~~~~~~~~~~~~~~~ NEW this issue: for my reviewing sanity, I am setting a soft page limit of fifteen pages. If you would like to write something longer, get in touch, but remember: brevity is the soul of wit. In any case, contact me if you intend to submit something -- the sooner you let me know what you're up to, the better. Please submit articles for the next issue to me by e-mail. Articles should be written according to the guidelines available from http://themonadreader.wordpress.com/contributing/ Please submit your article in PDF, together with any source files you used. The sources will be released together with the magazine under a BSD license. If you would like to submit an article, but have trouble with LaTeX please let me know and we'll work something out.

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Re: [Haskell-cafe] How to get access to Haddock HTML for newly cabal installed package?
by David Banas 24 Apr '14

24 Apr '14

Nope. I’ve had some great suggestions, but am still struggling to figure this one out. And, yes, I’m running on a MacBook using OSX Mavericks. Thanks, -db > Date: Thu, 24 Apr 2014 00:19:45 +0200 > From: Daniel D?az Casanueva <dhelta.diaz(a)gmail.com> > To: Haskell-Cafe <haskell-cafe(a)haskell.org> > Subject: Re: [Haskell-cafe] How to get access to Haddock HTML for > newly cabal installed package? > Message-ID: > <CAJFXAQjAHCfgD_vAcsGSxmzV1HmSpV_BOMyfVJZO4Ya5vJ0s%2BQ(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > I clicked "Reply All", hoping to reach the list, and I did. And yes, you > are right about he's probably using OSX. However, I do not have access to > any OSX to look for the right path. Did you solve the problem, David? > > Best regards, > Daniel D?az.

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How to get access to Haddock HTML for newly cabal installed package?
by David Banas 24 Apr '14

24 Apr '14

Does anyone know how I get the link to the Haddock generated HTML for a newly cabal installed package to show up in: file:///Users/dbanas/Library/Haskell/doc/index.html ? I’ve got documentation=True set, in ~/.cabal/config. Thanks, -db

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Diony Rosa
by Diony Rosa 24 Apr '14

24 Apr '14

http://kagankoc.av.tr/wpjbk/fowmsjjzqavbptwpdmgezeghq.wiodhkueoruzhok

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ANN: Monad.Reader Issue 23
by Edward Z. Yang 24 Apr '14

24 Apr '14

I am pleased to announce that Issue 23 of the Monad Reader is now available. http://themonadreader.files.wordpress.com/2014/04/issue23.pdf http://themonadreader.wordpress.com/2014/04/23/issue-23/ Issue 23 consists of the following five articles: * FizzBuzz in Haskell by Embedding a Domain-Specific Language by Maciej Pírog http://themonadreader.files.wordpress.com/2014/04/fizzbuzz.pdf * Supercompilation: Ideas and Methods (+appendix) by Ilya Klyuchnikov and Dimitur Krustev http://themonadreader.files.wordpress.com/2014/04/super-final.pdf * A Haskell sound specification DSL: Ludic support and deep immersion in Nordic technology-supported LARP by Henrik Bäärnhielm, Daniel Sundström and Mikael Vejdemo-Johansson http://themonadreader.files.wordpress.com/2014/04/celestria_main.pdf * MFlow, a continuation-based web framework without continuations by Alberto Gomez Corona http://themonadreader.files.wordpress.com/2014/04/mflow.pdf * Practical Type System Benefits by Neil Brown http://themonadreader.files.wordpress.com/2014/04/nccb.pdf This time around, I have individual article files for each (and the supercompilation article has an extra appendix not included in the full issue PDF). Feel free to browse the source files. You can check out the entire repository using Git: git clone https://github.com/ezyang/tmr-issue23.git If you’d like to write something for Issue 24, please get in touch! Cheers, Edward

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Haskell Weekly News: Issue 292
by Daniel Santa Cruz 24 Apr '14

24 Apr '14

Welcome to issue 292 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers from April 13 to 19, 2014 Edward Kemett wrote in to remind us of the Call For Proposals for CUFP 2014, which is going to be held in Gothenburg, Sweden between September 4-6. See more details here [1] http://goo.gl/X62cBO Quotes of the Week * pdxleif: see s.p. jones & h.p. lovecraft's paper on the subject: "generic programming with lenses, barbed wire, and the fibres of sanity" Top Reddit Stories * A time traveling debugger for Elm - pause, rewind, replay, and change history Domain: debug.elm-lang.org, Score: 87, Comments: 6 On Reddit: [2] http://goo.gl/GJahIU Original: [3] http://goo.gl/V2kcCP * OC: Haskell programming font with ligatures Domain: github.com, Score: 78, Comments: 59 On Reddit: [4] http://goo.gl/ZaFRJ4 Original: [5] http://goo.gl/m17EUj * Porting GHC: A Tale of Two Architectures Domain: chiark.greenend.org.uk, Score: 77, Comments: 12 On Reddit: [6] http://goo.gl/MJ196R Original: [7] http://goo.gl/PVVHZo * Try Idris Domain: tryidris.org, Score: 70, Comments: 22 On Reddit: [8] http://goo.gl/7hn84J Original: [9] http://goo.gl/6iPW8S * Why are examples completely absent from hackage? Am I missing something? Domain: self.haskell, Score: 67, Comments: 68 On Reddit: [10] http://goo.gl/QmZjZs Original: [11] http://goo.gl/QmZjZs * Implementing Python in Haskell - Melbourne Haskell Users Group, April 24 Domain: meetup.com, Score: 53, Comments: 6 On Reddit: [12] http://goo.gl/tYRtG9 Original: [13] http://goo.gl/oClHGb * Blog post - Haskell Gets Static Typing Right - Andres Löh Domain: skillsmatterblog.wordpress.com, Score: 51, Comments: 25 On Reddit: [14] http://goo.gl/5AQO4h Original: [15] http://goo.gl/WddMUA * Haskell for all: Scalable program architectures Domain: haskellforall.com, Score: 45, Comments: 19 On Reddit: [16] http://goo.gl/JDYSQl Original: [17] http://goo.gl/MUrRRg * GHC 7.8′s -staticlib flag makes compiling Mac libs easy Domain: maxs.io, Score: 42, Comments: 5 On Reddit: [18] http://goo.gl/SVICOm Original: [19] http://goo.gl/FwVdOv * Autocomplete command line options with GHC 7.8 Domain: self.haskell, Score: 39, Comments: 10 On Reddit: [20] http://goo.gl/bXNI20 Original: [21] http://goo.gl/bXNI20 * How to learn Haskell Domain: acm3.wustl.edu, Score: 39, Comments: 16 On Reddit: [22] http://goo.gl/oaQsAL Original: [23] http://goo.gl/TLbCEL * Calling Python from Haskell Domain: lunaryorn.com, Score: 36, Comments: 14 On Reddit: [24] http://goo.gl/9n8O4m Original: [25] http://goo.gl/j8YqgK * "latest API" link in Hackage Domain: self.haskell, Score: 30, Comments: 15 On Reddit: [26] http://goo.gl/RJnphF Original: [27] http://goo.gl/RJnphF * Functional Pearl: F for Functor Domain: cs.ox.ac.uk, Score: 27, Comments: 14 On Reddit: [28] http://goo.gl/i7TPuf Original: [29] http://goo.gl/7c33Xn Top StackOverflow Questions * Idris eager evaluation votes: 14, answers: 1 Read on SO: [30] http://goo.gl/LDpNtI * Why use such a peculiar function type in monads? votes: 11, answers: 4 Read on SO: [31] http://goo.gl/XX8KSX * How does mapA work with a Stream Function Arrow in Haskell? votes: 8, answers: 1 Read on SO: [32] http://goo.gl/vECKBa * Lenses and Monomorphism Restriction votes: 8, answers: 2 Read on SO: [33] http://goo.gl/hG44KA * Is this a GHC bug? votes: 7, answers: 1 Read on SO: [34] http://goo.gl/sqByI2 * Why do some of threepenny-gui FRP combinators operate on a MonadIO monad instead of being pure? votes: 6, answers: 2 Read on SO: [35] http://goo.gl/ySVqya * S combinator in Haskell votes: 6, answers: 2 Read on SO: [36] http://goo.gl/vnb64N * Graphing criterion benchmarks taking different orders of magnitude of time votes: 6, answers: 1 Read on SO: [37] http://goo.gl/J3jgWf * Fun with fixity votes: 6, answers: 1 Read on SO: [38] http://goo.gl/molyi9 Until next time, [39]+Daniel Santa Cruz References 1. http://cufp.org/2014cfp 2. http://debug.elm-lang.org/ 3. http://www.reddit.com/r/haskell/comments/233ff9/a_time_traveling_debugger_f… 4. https://github.com/i-tu/source-code-pro-L/ 5. http://www.reddit.com/r/haskell/comments/23g9dv/oc_haskell_programming_font… 6. http://www.chiark.greenend.org.uk/ucgi/~cjwatson/blosxom/2014-04-15-porting… 7. http://www.reddit.com/r/haskell/comments/232erb/porting_ghc_a_tale_of_two_a… 8. http://www.tryidris.org/console 9. http://www.reddit.com/r/haskell/comments/22yww7/try_idris/ 10. http://www.reddit.com/r/haskell/comments/23dxli/why_are_examples_completely… 11. http://www.reddit.com/r/haskell/comments/23dxli/why_are_examples_completely… 12. http://www.meetup.com/Melbourne-Haskell-Users-Group/events/174401572/ 13. http://www.reddit.com/r/haskell/comments/238akv/implementing_python_in_hask… 14. http://skillsmatterblog.wordpress.com/2014/04/15/guest-post-haskell-gets-st… 15. http://www.reddit.com/r/haskell/comments/233njg/blog_post_haskell_gets_stat… 16. http://www.haskellforall.com/2014/04/scalable-program-architectures.html 17. http://www.reddit.com/r/haskell/comments/2300zb/haskell_for_all_scalable_pr… 18. http://maxs.io/ghc-78-static-lib-flag/ 19. http://www.reddit.com/r/haskell/comments/23fyok/ghc_78s_staticlib_flag_make… 20. http://www.reddit.com/r/haskell/comments/236qkb/autocomplete_command_line_o… 21. http://www.reddit.com/r/haskell/comments/236qkb/autocomplete_command_line_o… 22. http://acm3.wustl.edu/functional/haskell.php 23. http://www.reddit.com/r/haskell/comments/239f2m/how_to_learn_haskell/ 24. http://www.lunaryorn.com/2014/04/15/calling-python-from-haskell.html 25. http://www.reddit.com/r/haskell/comments/2330aj/calling_python_from_haskell/ 26. http://www.reddit.com/r/haskell/comments/22xz96/latest_api_link_in_hackage/ 27. http://www.reddit.com/r/haskell/comments/22xz96/latest_api_link_in_hackage/ 28. http://www.cs.ox.ac.uk/people/daniel.james/functor/functor.pdf 29. http://www.reddit.com/r/haskell/comments/2327e7/functional_pearl_f_for_func… 30. http://stackoverflow.com/questions/23149532/idris-eager-evaluation 31. http://stackoverflow.com/questions/23051800/why-use-such-a-peculiar-functio… 32. http://stackoverflow.com/questions/23048100/how-does-mapa-work-with-a-strea… 33. http://stackoverflow.com/questions/23066099/lenses-and-monomorphism-restric… 34. http://stackoverflow.com/questions/23091080/is-this-a-ghc-bug 35. http://stackoverflow.com/questions/23044464/why-do-some-of-threepenny-gui-f… 36. http://stackoverflow.com/questions/23095224/s-combinator-in-haskell 37. http://stackoverflow.com/questions/23129649/graphing-criterion-benchmarks-t… 38. http://stackoverflow.com/questions/23142075/fun-with-fixity 39. https://plus.google.com/105107667630152149014/about

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Syntax proposal for "reverse apply"/"pipeline apply" (flip ($))
by Alexey Muranov 24 Apr '14

24 Apr '14

Hello, i am completely new to Haskell, but i am somewhat fascinated by lambda-calculus and programming. For whatever it is worth, i would like to propose for discussion a syntax for "(flip ($))" operation in Haskell. I think that a good syntax would be "|^", for example: square x = x * x y = 3 |^ square -- y == 9 Explanation: * i would have suggested just ^, but it would conflict with number exponentiation, * it is rather common in mathematics to write function application in exponential notation: x ^ f instead of f(x), especially if f is an automorphism of some structure, * (flip ($)) is exactly the exponentiation of Church numerals, * in "The calculi of lambda-conversion", Alonzo Church uses the "shorthand" notation "[N^M]" for "(MN)", where M and N are lambda-terms. * I am probably not the only person missing the ability to apply functions from the right: http://stackoverflow.com/questions/1457140/haskell-composition-vs-fs-pipe-f… Well, other notations i've thought of are "\^" and "~$". Alexey.

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Info on dependencies among libs distributed with ghc?
by Magnus Therning 23 Apr '14

23 Apr '14

I'm working on the packaging of Ghc for Arch Linux and the packaging of Ghc 7.8 was in place about a week ago. It was delivered with `Cabal` 1.18, and already now there's a 1.20 available, which is required by the latest version of `cabal-install` :( Ghc 7.8 comes with quite a few other basic libraries. Are there any dependencies between these libraries besides the obvious one on `base`? In other words, can I update Cabal without running into the diamond-dependency problem? /M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: magnus(a)therning.org jabber: magnus(a)therning.org twitter: magthe http://therning.org/magnus Most software today is very much like an Egyptian pyramid with millions of bricks piled on top of each other, with no structural integrity, but just done by brute force and thousands of slaves. -- Alan Kay

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