Announce: public Jenkins CI server - FP Complete
We have set up a new public Jenkins CI server for use with our open source projects. This server currently runs the Stack integration tests, and deploys to ci.haskell-lang.org and ci.stackage.org every time a commit is pushed to the master branch of their respective repositories. In the future, we also intend to set up Jenkins to run the Stack integration tests on all supported platforms (rather t
Status of School of Haskell 2.0 - FP Complete
Status of School of Haskell 2.0 Earlier this year, I wrote a blogpost about our plans for the next version of the School of Haskell. SoH is a community service and project to make it possible to use interactive snippets of Haskell on any website, in particular on schoolofhaskell.com. Today, we are open sourcing the SoH 2.0 repositories! We’ve also retired FP Haskell Center, and SoH pages that were
Monte carlo analysis in Haskell - FP Complete
A common analytic task is the monte carlo simulation. This involves sampling large numbers of random values in order to come to some kind of conclusion. Random numbers are often thought of as a weak point in purely functional languages. In a purely functional language like Haskell, we keep a strict separation between pure and impure functions. Since by its very nature, a function generating a rand
Call C functions from Haskell without bindings - FP Complete
Because Haskell is a language of choice for many problem domains, and for scales ranging from one-off scripts to full scale web services, we are fortunate to by now have over 8,000 open source packages (and a few commercial ones besides) available to build from. But in practice, Haskell programming in the real world involves interacting with myriad legacy systems and libraries. Partially because t
Haskell Web Server in a 5MB Docker Image - FP Complete
The Problem Recently we needed to redirect all Amazon Elastic Load Balancer (ELB) HTTP traffic to HTTPS. AWS ELB doesn’t provide this automatic redirection as a service. ELB will, however, let you map multiple ports from the ELB into the auto-scaling cluster of nodes attached to that ELB. People usually just point both port 80 & 443 to a webserver that is configured to redirect traffic through the
School of Haskell 2.0 - FP Complete
As announced by Michael Snoyman a couple weeks ago, we are going to be releasing an open source version of the School of Haskell! The SoH provides interactive documentation and tutorials for newcomers and advanced haskellers alike. This interactivity comes in the form of editable code, inline in the webpage, letting you try things out as you learn them. We are dedicated to supporting the community
Announcing: stackage-upload - FP Complete
I’m happy to announce the first version of stackage-upload. Copied below is the content of the README file; if you see errors please send a pull request to update the content. This tool is pretty simple right now, but can be easily extended. If others are interested in collaborating on this project, please be in touch. stackage-upload provides a more secure version of the cabal upload command by u
Announcing: first release of Stackage CLI (Command Line Tools) - FP Complete
We’re happy to announce the first release of stackage-cli (Command Line Interface). This project got started by a request in a somewhat unlikely place: a MinGHC issue. We started on this as a way to automate some of the instructions available on stackage.org, but quickly realized there was a lot more potential to make lives of developers even better. To get started, just run cabal update && cabal
The future of School of Haskell and FP Haskell Center - FP Complete
Last month, we announced the open sourcing of ide-backend, the engine underlying both School of Haskell and FP Haskell Center. In this blog post, I’m going to lay out FP Complete’s plans for the future of both of those services, and our overall commercial Haskell tooling. tl;dr Open sourcing School of Haskell, releasing brand new open source Stackage-based tooling, and merging the features of FP H
New in GHC 7.10: Partial Type Signatures - School of Haskell | School of Haskell
Interactive code snippets not yet available for SoH 2.0, see our Status of of School of Haskell 2.0 blog post In this tutorial we introduce you to the PartialTypeSignatures extension available in GHC starting from version 7.10. The goal is to teach you what you can do with this extension and how it can improve your development workflow. IntroductionPartial type signatures were introduced in GHC 7.
Announcing: monad-unlift - FP Complete
I’ve released the first version of monad-unlift. From its README: Typeclasses for providing for unlifting of monad transformers and stacks, and concrete implementations of common transformers implementing this type classes. This package is a companion to monad-control, providing simplified functions to a common subset of transformers and functionality. I’ve copied in the content of the README belo
Announcing: open sourcing of ide-backend - FP Complete
After many years of development, FP Complete is very happy and proud to announce the open sourcing of ide-backend. ide-backend has served as the basis for our development of School of Haskell and FP Haskell Center, by providing a high level, easy to use, and robust wrapper around the GHC API. We’d like to express our thanks to Duncan Coutts, Edsko de Vries, and Mikolaj Konarski for implementing th
MinGHC for GHC 7.10 - FP Complete
We’re happy to announce the availability of MinGHC for GHC 7.10. MinGHC is a minimal GHC installer for Windows, consisting of: GHC itself cabal-install MSYS, which is necessary for building some packages such as network MinGHC came out of some conversation Neil Mitchell and I had at ICFP last year about pain on the Windows platform, and consists of a lot of good code by Neil, and some hacky attemp
Primitive Haskell - FP Complete
I originally wrote this content as a chapter of Mezzo Haskell. I’m going to be starting up a similar effort to Mezzo Haskell in the next few days, and I wanted to get a little more attention on this content to get feedback on style and teaching approach. I’ll be discussing that new initiative on the Commercial Haskell mailing list. The point of this chapter is to help you peel back some of the lay
A monad for reactive programming. Part 1 - School of Haskell | School of Haskell
Interactive code snippets not yet available for SoH 2.0, see our Status of of School of Haskell 2.0 blog post For the impatient: you can find something runnable at the bottom. Functional reactive programming has no notion of event scope. A functional, declarative, reactive computation is affected as a whole by a signal, and must re-start from the beginning in some way, since it is declarative. A m
3.1 release changes - FP Complete
On September 28 we released 3.1 of the FP Complete public services. We’ve discussed this a bit already, but in this blog post, we want to share some of the more technical details of what we’ve added. Laundry list of features We’ve added a whole bunch of new features to FP Haskell Center. Here are some of the most notable: You can now access all features of the IDE for free It’s faster More file ty
Many Roads to Free Monads - School of Haskell | School of Haskell
Interactive code snippets not yet available for SoH 2.0, see our Status of of School of Haskell 2.0 blog post Free monads are handy constructs to have in one's bag of tricks, and have become fairly popular of late. This article attempts to explain their basis in category theory, as well as some interesting/amusing connections that may not have been spelled out elsewhere. Free as in MonoidsFree mon
Parsing Log FIles in Haskell - School of Haskell | School of Haskell
Interactive code snippets not yet available for SoH 2.0, see our Status of of School of Haskell 2.0 blog post IntroductionIn this tutorial you will learn how to parse log-like files and how to render a log to a file. Many applications use logs to keep track of some useful information to be analysed later on. Parsing a log-like file it is an easy parsing task in comparison with parsing, say, a prog
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Blog Posts - FP Complete
Database access - School of Haskell | School of Haskell