October 2014 - Haskell-Cafe

ANN: yi-0.10.0 , the text editor written in Haskell
by Mateusz Kowalczyk 14 Oct '14

14 Oct '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 We're glad to announce Yi 0.10.0. Yi is 10 years old today! Our main repository is at [1]. Yi compiles with GHC 7.6.3 all the way up to GHC 7.8.3. There have been many changes since the latest Hackage release (0.8.2). I inline the relevant part of the changelog at the bottom. We are slowly trying to populate the documentation pages: we have recently started using GitHub pages[2] for this purpose. Please have a look! On top of the issues listed in the changelog, a lot of issues were closed separately. If you had a pending issue, please check the issue tracker. As always we're looking for contributors: we have tasks in just about any area. Note that you don't even need to know Haskell to help us. Visit us on #yi on Freenode: be prepared to stay for more than 5 minutes. Installation instructions are available at [2]. If you're using nix, Yi 0.10.0 will be packaged shortly. 0.10.0 - ------ * Unicode syntax highlighting fixed (issue #82) * Hook to GTK Window exposed (#557) * Multiple components moved out to separate packages (oo-prototypes, word-trie, yi-languages, yi-string) * Replace a lot of the API to use YiString/Text instead of String improving performance * Greatly improve performance in the pango front-end as long as line-wrapping is on (default) * Recognise read-only files (#145) * Various Vim keymap improvements and fixes * Use lens instead of uniplate, replace some boilerplate with lens * Improve test framework to handle windows interactions, e.g. scrolling. * Use GHC.Generics instead of derive on GHC 7.8 * Remove bitrotten ghcapi and scion flags. * Support non-qwerty vim users * Support eventlog profiling with -feventlog * Eliminate idle CPU consumption in vty frontend * General cleanup * Make C-w closer to actual emacs behaviour (#612) * Make M-h behave more like emacs (#611) * Hint with buffer names when using C-k with emacs keymap (#606) * Fix display of paths starting with / (#528) * Don't mark buffer as changed if nothing was killed (#618) * Nicer findFile &c behaviour in dired buffers (#149) * Implement C-a for CUA (#167) * Fix dired for directories with unicode files/dirs (#445) * Fix vim indenting under some circumstances (#621) * Allow the font size to be changed per buffer (#608) * Double-click and triple-click selection in pango (#100 and #101) * Count columns properly in presence of tabs (#440) * Extra marking operations in dired Contributors: Alan Zimmerman, Anders Papitto, Anthony Quizon, Ben Armston, Benno Fünfstück, Carter Charbonneau, Corey O'Connor, Cray Elliott, Dmitry Ivanov, fiendfan1, Ilya Smelkov, Jakub Arnold, Jared Hance, jetho, Mateusz Kowalczyk, Richard Goulter, Ryan Desfosses, Siddhanathan Shanmugam 0.9.0 - ----- * Vim keymap removed. Vim2 is now called Vim. [1]: https://github.com/yi-editor/yi [2]: http://yi-editor.github.io/ - -- Mateusz K. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJUPWXYAAoJEM1mucMq2pqXgzcP/0iljWag1qweflSYIqKa+FOc n/NYTqUV3HIYSGxolUvnm5HMfJ1uFFYmV7BVEtC7VcdntdP/bUCxu2gdOA9XxIrL JFwV3tzvLFqPYsm0bBVwq+lqRaBF2ICK95gmZpE+Osw7lrIK0SwibGAuLL+niRoo Qf5duTZXMBw0gQxay47zAb1XPwUhLYQUThSnbcOAG1raRI3OCV/eyMky+l5WMLTy 3RK5j2ZsWnps9k1XOFBVR/pQ6kJiFrButfLY7c3RBbfY9+uHQDN1ba3hr3wHsXUP fw4PiM6WmHecezH1Q7TSzH0XL+Mh5miM+g2QGphKAjeACOzskiCYRGcBpUCHSPsO EdxHe62oUvonEPAP747lCMRcYURknvoyVCDKjYzNKFBHJPFAizWW+tlv82QKKT1j CKECN7Lkra3nlLKzi11TdLHMUDGmatJeNHUMp4W1EDGG/hRbobrmD+2U2Yt/pRKH f/tSeE5Azk0xjDMNmYZBprqf1O1Q9tve4NrIHgQK0EXRWhkcFAsGIdqQBHP27Z0s JdCXdlMaRs4u2IfYoDevnFadMGF10oqQ1wUJPtIzcVvghgBkZEIMswsqbD5fTtPf Y/DFe2YcJl+lxPqgm/fq3aDnJABGYLftfJ05Rs1BGA909bnW29YqK0Si8JxAoH4R K6YQBTpqWULfHXh/ZQ68 =CAHP -----END PGP SIGNATURE-----

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ANN: New version of graphmod (1.2.4)
by Iavor Diatchki 14 Oct '14

14 Oct '14

Hello, I am pleased to announce a new version of `graphmod`---a program that helps you visualize the import dependencies between the modules in your Haskell programs. The new feature in version 1.2.4 is support for pruning the dependency graph, which is enabled with the flag -p or --prune-edges. When this option is selected, `graphmod` will ignore imports to modules that are already imported by some of the dependencies of the module. For example, consider the following modules: module A where { import B; import C } module B where { import C } module C where { } When generated with `--prune-edges`, the resulting graph will be: A -> B -> C Note that there is no edge from `A` to `C`, because `C` is already imported by `B`. Happy hacking, -Iavor

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Re: [Haskell-cafe] Pretty Printing Libraries with an Emphasis on Consistency
by Oliver Charles 14 Oct '14

14 Oct '14

Yes, hindent is exponential in its pretty printing and that's exactly the program I'm trying to speed up ;) To be specific, hindent has `sandbox` which runs a printer and then lets me make decisions on what the resulting state might be. I'm curious if there are other approaches. - ocharles On Sat, Oct 11, 2014 at 12:01 PM, Alan & Kim Zimmerman <alan.zimm(a)gmail.com> wrote: > Have you looked at hindent? > On 11 Oct 2014 11:52 AM, "Oliver Charles" <ollie(a)ocharles.org.uk> wrote: > >> Hi all, >> >> It seems that all of the pretty printing libraries on Hackage at the >> moment have an emphasis on being compact, but not necessarily consistent. >> By consistent, I mean that similar blocks of code are indented in the same >> fashion, even when not strictly necessary. >> >> Take for example, the start of "Pretty Printing with Lazy Dequeues". >> Here, the example is: >> >> if True >> then if True then True else True >> else >> if False >> then False >> else False >> >> I call this inconsistent, because the two sides of the top-level if have >> been formatted under different rules. A consistent formatting of this would >> be: >> >> if True >> then >> if True >> then True >> else True >> else >> if False >> then False >> else False >> >> The above can obviously be reached if you *always* format `if` in this >> style, but that's not what I'm after. If it's possible to format both sides >> on one-line, then that should be preferred. So an equally desirable output >> (that meets my "consistency" requirement) is: >> >> if True >> then if True then True else True >> else if True then True else True >> >> It doesn't seem that there is a library on Hackage that lets one express >> such a pretty printer. It seems that a pretty printer of this nature would >> need to have some sort of backtracking ability - I can imagine trying to >> print both sides of the if statement on one-line, and if this fails, try >> printing *both* on multiple lines. >> >> Curious to hear what people have to say on this matter, >> - ocharles >> >> _______________________________________________ >> Haskell-Cafe mailing list >> Haskell-Cafe(a)haskell.org >> http://www.haskell.org/mailman/listinfo/haskell-cafe >> >>

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Wiki account creation
by Pelumi Magbagbeola 13 Oct '14

13 Oct '14

Preferred Username is: Looms (I hope I have done this correctly)

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Dependencies missing when building ghc.
by Magicloud Magiclouds 13 Oct '14

13 Oct '14

Hi, I am with my new Ubuntu Trusty box. I have installed ghc by apt-get. Then I wanted to build ghc from git to upgrade to 7.8.3. I did following commands. I tried 'make clean', or reget the source. No luck yet. $ git clone --recursive git://git.haskell.org/ghc.git $ ./sync-all -r git://git.haskell.org remote set-url origin $ git checkout ghc-7.8.3-release $ ./sync-all get $ rm -r libraries/time # as prompted by sync-all $ ./sync-all get $ ./boot $ ./configure $ make ===--- building phase 0 make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds make[1]: Nothing to be done for `phase_0_builds'. ===--- building phase 1 make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds "inplace/bin/ghc-cabal" check libraries/haskell98 "inplace/bin/ghc-cabal" configure libraries/haskell98 dist-install "" --with-ghc="/home/local/ANT/shida/src/git/ghc/inplace/bin/ghc-stage1" --with-ghc-pkg="/home/local/ANT/shida/src/git/ghc/inplace/bin/ghc-pkg" --disable-library-for-ghci --enable-library-vanilla --enable-library-profiling --enable-shared --configure-option=CFLAGS=" -fno-stack-protector " --configure-option=LDFLAGS=" " --configure-option=CPPFLAGS=" " --gcc-options=" -fno-stack-protector " --with-gcc="/usr/bin/gcc" --with-ld="/usr/bin/ld" --configure-option=--with-cc="/usr/bin/gcc" --with-ar="/usr/bin/ar" --with-ranlib="/usr/bin/ranlib" --with-alex="/usr/bin/alex" --with-happy="/usr/bin/happy" Configuring haskell98-2.0.0.4... ghc-cabal: At least the following dependencies are missing: base ==4.8.* make[1]: *** [libraries/haskell98/dist-install/package-data.mk] Error 1 make: *** [all] Error 2 -- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

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Re: [Haskell-cafe] online tutorial
by Roelof Wobben 13 Oct '14

13 Oct '14

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online tutorial
by Roelof Wobben 13 Oct '14

13 Oct '14

Hello, I want to learn haskell by using the fpcomplete site. Now I wonder if this ( https://www.fpcomplete.com/school/starting-with-haskell/haskell-fast-hard) is a good tutorial for a beginner. Roelof

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documentation build failing in hackage?
by Alberto G. Corona 13 Oct '14

13 Oct '14

Sorry if this has been asked/discussed previously It seems that there are many packages in which the documentation is not generated. That is the visible effect since there is no indication if the build process failed or not. Could anyone give me some hints? I did a lazy look at the hackage2 documentation but I found nothing about that. Only that it is possible to upload the documentation if the build bot fails... -- Alberto.

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New Functional Programming Job Opportunities
by Functional Jobs 13 Oct '14

13 Oct '14

Here are some functional programming job opportunities that were posted recently: Functional Software Engineer at Cake Solutions Ltd http://functionaljobs.com/jobs/8755-functional-software-engineer-at-cake-so… Software Engineer / Developer at Clutch Analytics/ Windhaven Insurance http://functionaljobs.com/jobs/8753-software-engineer-developer-at-clutch-a… Cheers, Sean Murphy FunctionalJobs.com

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cabal sandbox using absolute path on symlinked dir
by Vlatko Basic 13 Oct '14

13 Oct '14

Hello Cafe, On Ubuntu, after creating a sandboxed project in a symlinked directory, cabal.sandbox.config contains absolute (canonical) paths of the directory, and not the symlinked paths. Is this a bug, and is there a way to correct that behavior? There is no way to move the project to a different place without recreating the whole sandbox. Best regards, vlatko

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