November 2013 - Haskell-Cafe

Internship opportunities at Galois
by Adam Foltzer 01 Nov '13

01 Nov '13

Hello, Galois has some exciting opportunities for interns in software engineering and research for 2014. Most of our projects use Haskell to some extent, so this is a great chance to get experience applying functional programming to real-world problems. Please pass along this posting to anyone you think might be interested, even if they don't yet know Haskell! Thank you, Adam Foltzer --- # Galois Software Engineering/Research Intern # Galois is currently seeking software engineering and research interns for 2014 at all educational levels. We are committed to matching interns with exciting and engaging engineering work that fits their particular interests, creating lasting value for interns, Galois, and our community. A Galois internship is a chance to tackle cutting-edge, meaningful problems in a uniquely collaborative environment with world-leading researchers. Roles may include technology research and development, requirements gathering, implementation, testing, formal verification, and infrastructure development. Past interns have integrated formal methods tools into larger projects, built comprehensive validation suites, synthesized high-performance cryptographic algorithms, written autopilots for quad-copters, designed the syntax and semantics of scripting languages, and researched type system extensions for academic publication. We deeply believe in providing comprehensive support and mentorship to all of our employees, particularly interns. We provide our employees with a steward who regularly checks in to ensure that they feel welcome and safe in the Galois community while gaining real value from their experiences. ## About Galois ## Our mission is to create trustworthiness in critical systems. We're in the business of taking blue-sky ideas and turning them into real-world technology solutions. We've been developing real-world systems for over ten years using functional programming, language design, and formal methods. Galois values diversity. We believe that differing viewpoints and experiences are essential to the process of innovation. We look broadly, including outside of established communities, to deliver innovation. ## How to Prepare ## An internship is an opportunity for learning and growth as an engineer. To make the most of the opportunity, we ask that candidates have experience reading, writing, and maintaining code in a realistic project. Many university courses involve multi-week collaborative projects that provide this type of experience. Most of our projects use the Haskell programming language and the git version control system. These tools aren't often taught in computer science classes, but there are many free resources available that we recommend for learning: - [Learn You a Haskell for Great Good!] [1] by Miran Lipovača - [Real World Haskell] [2] by Bryan O'Sullivan, Don Stewart, and John Goerzen - [tryGit] [3] by Code School - [Pro Git] [4] by Scott Chacon [1]: http://learnyouahaskell.com/ [2]: http://book.realworldhaskell.org/ [3]: http://try.github.io [4]: http://git-scm.com/book ## Qualifications ## - The ability to be geographically located in Portland during the internship - Experience reading, writing, and maintaining code in a project as described above - Proficiency in software development practices such as design, documentation, testing, and the use of version control - Well-developed verbal and written communication skills; comfort in a collaborative team environment The following skills are not required, but may be relevant to a particular project. - Proficiency in Haskell or other programming languages with rich type systems (eg., OCaml, Standard ML, Scala) - Experience using C and assembly languages for low-level systems programming - Development experience in high assurance systems or security software - Specific experience in an area of Galois' expertise, such as: - Assured information sharing - Software modelling and formal verification - Cyber-physical systems and control systems - Operating systems, virtualization and secure platforms - Networking and mobile technology - Cyber defense systems - Scientific computing - Program analysis and software evaluation - Web security ## Logistics ## The length and start date of the internship are negotiable: starting any time from the new year through next fall is acceptable, but an intern must be at Galois for at least three continuous months. The internship is paid competitively, and interns are responsible for living arrangements (although we can certainly help you find arrangements). Galois is located in the heart of downtown Portland with multiple public transportation options available and world-class bicycle infrastructure. ## Application Details ## Send an email to careers(a)galois.com with the subject line "Internship 2014" with the following contents: - Email body: a brief plain-text note explaining your interests, experience, and other relevant details - Attachment: CV/Resume (PDF, plain text, or markdown only) **Applications must be received at least two months before the desired start date**. For example, we must receive your application by November 6, 2013, if you wish to start on January 6, 2014.

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Accessing own haddock files
by Corentin Dupont 01 Nov '13

01 Nov '13

Hi the list, I have an application that need to access its own haddock documentation (to display on a web site). What is the best way to do that? Unfortunatly Cabal doesn't seem to provide that. Cabal generates a file "<package name>_Path.hs" containing: *bindir = "/home/kau/.cabal/bin" libdir = "/home/kau/.cabal/lib/Nomyx-Language-0.4.0/ghc-7.6.3" datadir = "/home/kau/.cabal/share/Nomyx-Language-0.4.0"* But there is no: *docdir = "/home/kau/.cabal/share/doc/Nomyx-Language-0.4.0"* That would be handy in my situation :) Best, Corentin

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Cabal sandboxes over cabal-dev
by Graham Berks 01 Nov '13

01 Nov '13

Can someone point me in the direction of why you would use one over the other ?? Thanks Graham

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SYB: queries using IO Monad
by JP Moresmau 01 Nov '13

01 Nov '13

Hello cafe, I have code that works well using the syb package, and the ext1Q, extQ and gmapQ functions. This code that a Data and transforms it into something else. However I need to make a change, and this change involves calling a function in the IO monad (the function is from another library so I have no choice). However, the ext1Q, extQ and gmapQ functions have no monadic equivalent. There seems to be monadic transformation (from a to different a) but no monadic queries (from a to b). Do I have to rewrite these functions myself to work with monadic queries (it at all possible) or is there a better way? I've seen some functions that work with monads and MonadPlus, but I don't see anything that would work with IO. So far I've checked that the IO() function I'm calling does the job by using unsafePerformIO, but I know that's a sin and I'd like to find a better way! Thanks! JP -- JP Moresmau http://jpmoresmau.blogspot.com/

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cabal-install sandbox with happy and alex
by Badi' Abdul-Wahid 31 Oct '13

31 Oct '13

Hi I've run into difficulty building happy and alex using the sandbox feature of cabal-install 1.18.0.2. Installation of dependencies succeeds but both happy and alex fail with: setup: The program happy is required but it could not be found My workaround is to use the --only-dependencies flag, install the dependencies, and manually install the packages. This is on Mac OS X 10.8.4 with GHC 7.6.3. I've copied the steps demonstrating the problem on lpaste: http://lpaste.net/95027 Summary to reproduce: cabal sandbox init; cabal install happy alex Below is the script for my workaround. [0 :)] badi@olorin /tmp/sb ~> cat sandbox-install.sh #!/usr/bin/env bash packages="$@" cabal sandbox init cabal install --only-dependencies $packages for p in $packages; do cabal unpack $p pushd $p-* cabal sandbox --sandbox ../.cabal-sandbox init cabal configure cabal build runhaskell Setup.lhs install popd done -- Badi' Abdul-Wahid

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