- Haskell-Cafe - Haskell.org

CfP: Haskell Symposium 2023
by Niki Vazou 21 Mar '23

21 Mar '23

=============================================================================== ACM SIGPLAN CALL FOR SUBMISSIONS Haskell Symposium 2023 Seattle, WA, USA Fri 8 -- Sat 9 September, 2023 http://www.haskell.org/haskell-symposium/2023/ ================================================================================ The ACM SIGPLAN Haskell Symposium 2023 will be co-located with the 2023 International Conference on Functional Programming (ICFP). As with last year, Haskell'23 will use a single-track submission process. That is, we will only have the regular track and no early track. The Haskell Symposium presents original research on Haskell, discusses practical experience and future development of the language, and promotes other forms of declarative programming. Topics of interest include: * Language design, with a focus on possible extensions and modifications of Haskell as well as critical discussions of the status quo; * Theory, such as formal semantics of the present language or future extensions, type systems, effects, metatheory, and foundations for program analysis and transformation; * Implementations, including program analysis and transformation, static and dynamic compilation for sequential, parallel, and distributed architectures, memory management, as well as foreign function and component interfaces; * Libraries, that demonstrate new ideas or techniques for functional programming in Haskell; * Tools, such as profilers, tracers, debuggers, preprocessors, and testing tools; * Applications, to scientific and symbolic computing, databases, multimedia, telecommunication, the web, and so forth; * Functional Pearls, being elegant and instructive programming examples; * Experience Reports, to document general practice and experience in education, industry, or other contexts; * Tutorials, to document how to use a particular language feature, programming technique, tool or library within the Haskell ecosystem; * System Demonstrations, based on running software rather than novel research results. Regular papers should explain their research contributions in both general and technical terms, identifying what has been accomplished, explaining why it is significant, and relating it to previous work, and to other languages where appropriate. Experience reports and functional pearls need not necessarily report original academic research results. For example, they may instead report reusable programming idioms, elegant ways to approach a problem, or practical experience that will be useful to other users, implementers, or researchers. The key criterion for such a paper is that it makes a contribution from which other Haskellers can benefit. It is not enough simply to describe a standard solution to a standard programming problem, or report on experience where you used Haskell in the standard way and achieved the result you were expecting. Like an experience report and a functional pearl, tutorials should make a contribution from which other Haskellers can benefit. What distinguishes a tutorial is that its focus is on explaining an aspect of the Haskell language and/or ecosystem in a way that is generally useful to a Haskell audience. Tutorials for many such topics can be found online; the distinction here is that by writing it up for formal review it will be vetted by experts and formally published. System demonstrations should summarize the system capabilities that would be demonstrated. The proposals will be judged on whether the ensuing session is likely to be important and interesting to the Haskell community at large, whether on grounds academic or industrial, theoretical or practical, technical, social or artistic. Please contact the program chair with any questions about the relevance of a proposal. If your contribution is not a research paper, please mark the title of your experience report, functional pearl, tutorial or system demonstration as such, by supplying a subtitle (Experience Report, Functional Pearl, Tutorial Paper, System Demonstration). Submission Details ================== Formatting ---------- Submitted papers should be in portable document format (PDF), formatted using the ACM SIGPLAN style guidelines. Authors should use the `acmart` format, with the `sigplan` sub-format for ACM proceedings. For details, see: http://www.sigplan.org/Resources/Author/#acmart-format It is recommended to use the `review` option when submitting a paper; this option enables line numbers for easy reference in reviews. Functional pearls, experience reports, tutorials and demo proposals should be labelled clearly as such. Lightweight Double-blind Reviewing ---------------------------------- Haskell Symposium 2023 will use a lightweight double-blind reviewing process. To facilitate this, submitted papers must adhere to two rules: 1. Author names and institutions must be omitted, and 2. References to authors' own related work should be in the third person (e.g., not "We build on our previous work" but rather "We build on the work of "). The purpose of this process is to help the reviewers come to an initial judgement about the paper without bias, not to make it impossible for them to discover the authors if they were to try. Nothing should be done in the name of anonymity that weakens the submission or makes the job of reviewing the paper more difficult (e.g., important background references should not be omitted or anonymised). In addition, authors should feel free to disseminate their ideas or draft versions of their paper as they normally would. For instance, authors may post drafts of their papers on the web or give talks on their research ideas. A reviewer will learn the identity of the author(s) of a paper after a review is submitted. Page Limits ----------- The length of submissions should not exceed the following limits: Regular paper: 12 pages Functional pearl: 12 pages Tutorial: 12 pages Experience report: 6 pages Demo proposal: 2 pages There is no requirement that all pages are used. For example, a functional pearl may be much shorter than 12 pages. In all cases, the list of references is not counted against these page limits. Deadlines --------- Paper submission: 1 June 2023 (Thu) Notification: 4 July 2023 (Tue) Camera ready: 18 July 2023 (Tue) Deadlines are anywhere on Earth. Submission ---------- Submissions must adhere to SIGPLAN's republication policy (http://sigplan.org/Resources/Policies/Republication/) and authors should be aware of ACM's policies on plagiarism (https://www.acm.org/publications/policies/plagiarism) Program Committee members are allowed to submit papers, but their papers will be held to a higher standard. The paper submission deadline and length limitations are firm. There will be no extensions, and papers violating the length limitations will be summarily rejected. Papers should be submitted through HotCRP at: https://haskell23.hotcrp.com/ Improved versions of a paper may be submitted at any point before the submission deadline using the same web interface. Supplementary material: Authors have the option to attach supplementary material to a submission, on the understanding that reviewers may choose not to look at it. This supplementary material should not be submitted as part of the main document; instead, it should be uploaded as a separate PDF document or tarball. Supplementary material should be uploaded at submission time, not by providing a URL in the paper that points to an external repository. Authors can distinguish between anonymised and non-anonymised supplementary material. Anonymised supplementary material will be visible to reviewers immediately; non-anonymised supplementary material will be revealed to reviewers only after they have submitted their review of the paper and learned the identity of the author(s). Resubmitted Papers: authors who submit a revised version of a paper that has previously been rejected by another conference have the option to attach an annotated copy of the reviews of their previous submission(s), explaining how they have addressed these previous reviews in the present submission. If a reviewer identifies him/herself as a reviewer of this previous submission and wishes to see how his/her comments have been addressed, the conference chair will communicate to this reviewer the annotated copy of his/her previous review. Otherwise, no reviewer will read the annotated copies of the previous reviews. Proceedings =========== Accepted papers will be included in the ACM Digital Library. Their authors will be required to choose one of the following options: - Author retains copyright of the work and grants ACM a non-exclusive permission-to-publish license (and, optionally, licenses the work with a Creative Commons license); - Author retains copyright of the work and grants ACM an exclusive permission-to-publish license; - Author transfers copyright of the work to ACM. For more information, please see ACM Copyright Policy (http://www.acm.org/publications/policies/copyright-policy) and ACM Author Rights (http://authors.acm.org/main.html) Accepted proposals for system demonstrations will be posted on the symposium website but not formally published in the proceedings. Publication date: The official publication date of accepted papers is the date the proceedings are made available in the ACM Digital Library. This date may be up to two weeks prior to the first day of the conference. The official publication date affects the deadline for any patent filings related to published work. Artefacts ========= Authors are encouraged to make auxiliary material (artefacts like source code, test data, etc.) available with their paper. Authors can opt to have these artefacts published alongside their paper in the ACM Digital Library (copyright of artefacts remains with the authors). Artefacts must be included as part of their submission to HotCRP and should consist of a .zip file containing the artefact materials, a README explaining the contents of the artefact and how it should be used, and a LICENSE file. If an accepted paper's artefacts are made permanently available for retrieval in a publicly accessible archival repository like the ACM Digital Library, that paper qualifies for an Artefact badge (https://www.acm.org/publications/policies/artifact-review-badging) Program Committee ================= Alexander Green Standard Chartered, UK David Thrane Christiansen The Haskell Foundation, Denmark Edsko de Vries Well-Typed LLP, Netherlands Exequiel Rivas Tallinn University of Technology Facundo DomÃnguez Tweag Florian Zuleger TU Vienna, Austria Graham Hutton University of Nottingham, UK Jasper Van der Jeugt Snyk, Switzerland Jennifer Paykin Intel, USA Jesper Cockx Delft University of Technology, Netherlands Jose Nuno Oliveira University of Minho & INESC TEC, Portugal Michael Sperber Active Group GmbH, Germany Michel Steuwer University of Edinburgh, UK Niki Vazou (chair) IMDEA Software Institute, Spain Rumyana Neykova Brunel University London, UK Trevor L. McDonell (co-chair) Utrecht University, Netherlands Ugo Dal Lago University of Bologna, Italy & INRIA, France Wen Kokke University of Edinburgh, UK Leonidas Lampropoulos University of Maryland, College Park, USA If you have questions, please contact the chairs at niki.vazou(a)imdea.org andt.l.mcdonell(a)uu.nl. ================================================================================

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Presentaion on Haskell by Emily Pillmore
by Jonathan Drews 20 Mar '23

20 Mar '23

Hello Folks: On 03/21/23, at 7:00 PM EDT, Emily Pillmore, former CTO of the Haskell Foundation, will give a presentation on Haskell. She will cover the rudiments of functional programming and an overview of CABAL (Common Architecture for Building Applications and Libraries). The link is: https://meet.jit.si/SEMI-BUGHaskellTalk Ms. Pillmore is a profesional programmer and has a degree in Mathematics. She is a member of the Haskell Core Libraries team. She is also a member of the Haskell.org committee This is a great opportunity to get an overview of a pure functional programming language. -- Kind regards, Jonathan http://www.semibug.org/

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Emily Pillmore to talk about Haskell
by Jonathan Drews 17 Mar '23

17 Mar '23

Folks: On March 21st, at 7:00 Pm EDT, Emily Pillmore, The CTO of the Haskell Foundation, will give a presentation on Haskell. The presentation is online and hosted by http://www.semibug.org/. This online event will be conducted through Jitsi. The Jitsi link will be posted here on Monday, March 20th. Please do tell your friends about this event as this is going to be a great presentation on Haskel by one of its most consummate practioners. -- Kind regards, Jonathan

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Utrecht Summer School on Advanced Functional Programming 2023
by Swierstra, W.S. (Wouter) 16 Mar '23

16 Mar '23

# Call for Participation SUMMER SCHOOL ON ADVANCED FUNCTIONAL PROGRAMMING Utrecht, the Netherlands, 03 July – 07 July 2023 http://www.afp.school **Please register before June 15th ** ## ABOUT The Advanced Functional Programming summer school has been running for more than ten years. We aim to educate aspiring Haskell programmers beyond the basic material covered by many textbooks. The lectures will cover several more advanced topics regarding the theory and practice of Haskell programming, including topics such as: * lambda calculus; * monads and monad transformers; * lazy evaluation; * generalized algebraic data types; * type families and type-level programming; * concurrency and parallelism. The summer school will be held in Utrecht and consists of a mix of lectures, labs, and a busy social program. ## PREREQUISITES We expect students to have a basic familiarity with Haskell already. You should be able to write recursive functions over algebraic data types, such as lists and trees. There is a great deal of material readily available that covers this material. If you've already started learning Haskell and are looking to take your functional programming skills to the next level, this is the course for you. ## DATES **Registration deadline: June 15th, 2023** School: 03 July – 07 July 2023 ## COSTS 750 euro - Profession registration fee 250 euro - Student registration fee 200 euro - Housing fee We will charge a registration fee of 750 euros (or 250 euros for students) to cover our expenses. If this is problematic for you for any reason at all, please email the organisers and we can try to offer you a discounted rate or a fee waiver. We have a limited number of scholarships or discounts available for students that would not be able to attend otherwise, especially for women and under-represented minorities. ## FURTHER INFORMATION Further information, including instructions on how to register, is available on our website: http://www.afp.school

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Call for Papers, Functional Software Architecture - FP in the Large
by Graham Hutton 16 Mar '23

16 Mar '23

Dear all, We're delighted to announce that the first ACM SIGPLAN Workshop on "Functional Software Architecture - FP in the Large" will be held in Seattle, USA in September 2023, co-located with the ICFP conference. Please share, and submit your best papers, experience reports, and architectural pearls on large-scale functional programming! Best wishes, Mike Sperber and Graham Hutton Program Chairs, FUNARCH 2023 ====================================================================== *** FUNARCH 2023 -- CALL FOR PAPERS *** The First ACM SIGPLAN Workshop on Functional Software Architecture - FP in the Large 8th September 2023, Seattle, Washington, USA Co-located with ICFP 2023 https://tinyurl.com/FUNARCH23 ====================================================================== TIMELINE: Paper submission 1st June 2023 Author notification 28th June 2023 Camera ready copy 18th July 2023 Workshop 8th Sept 2023 (date to be confirmed) BACKGROUND: "Functional Software Architecture" refers to methods of construction and structure of large and long-lived software projects that are implemented in functional languages and released to real users, typically in industry. The goals for the workshop are: - To assemble a community interested in software architecture techniques and technologies specific to functional programming; - To identify, categorize, and document topics relevant to the field of functional software architecture; - To connect the functional programming community to the software architecture community to cross-pollinate between the two. The workshop follows on from the Functional Software Architecture open space that was held at ICFP 2022 in Slovenia. SCOPE: The workshop seeks submissions in a range of categories: - You're a member of the FP community and have thought about how to support programming in the large, for example by framing functional ideas in architectural terms or vice verse, comparing different languages in terms of their architectural capabilities, clarifying architectural roles played by formal methods, proof assistants and DSLs, or observing how functional concepts are used in other language and architecture communities. Great, submit a research paper! - You're a member of the architecture community, and have thought about how your discipline might help functional programmers, for example by applying domain-driven design, implementing hexagonal architecture, or designing self-contained systems. Excellent, submit a research paper! - You've worked on a large project using functional programming, and it's worked out well, or terribly, or a mix of both; bonus points for deriving architectural principles from your experience. Wonderful, submit an experience report! - You know a neat architectural idiom or pattern that may be useful to others developing large functional software systems. Fabulous, submit an architectural pearl! - You have something that doesn't fit the above categories, but that still relates to functional software architecture, such as something that can be written up, or that could be part of the workshop format like a panel debate or a fishbowl. Superb, submit to the open category! Research papers should explain their research contributions in both general and technical terms, identifying what has been accomplished, explaining why it is significant, and relating it to previous work, and to other languages where appropriate. Experience reports and architectural pearls need not necessarily report original research results. The key criterion for such papers is that they make a contribution from which others can benefit. It is not enough simply to describe a large software system, or to present ideas that are specific to a particular system. Open category submissions that are not intended for publication are not required to follow the formatting guidelines, and can submit in PDF, word or plain text format as preferred. If you are unsure whether your contribution is suitable, or if you need any kind of help with your submission, please email the program chairs at <funarch2023(a)easychair.org>. SUBMISSION: Papers must be submitted by 1st June 2023 using EasyChair, via the following link: https://tinyurl.com/FUNARCH23-submit Formatting: submissions intended for publication must be in PDF format and follow the ACM SIGPLAN style guidelines, using the acmart format and the sigplan sub-format. Please use the review option, as this enables line numbers for easy reference in reviews. For further details, see: https://tinyurl.com/sigplan-acmart If your submission is not a research paper, please mark this using a subtitle (Experience Report, Architectural Pearl, Open Category). Length: submissions must adhere to the limits specified below. However, there is no requirement or expectation that all pages are used, and authors are encouraged to strive for brevity. Research papers 5 to 12+ pages Architectural pearls 5 to 12 pages Experience reports 3 to 6 pages Open category 1 to 6 pages Publication: The proceedings of FUNARCH 2023 will be published in the ACM Digital Library, and authors of accepted papers are required to agree to one of the standard ACM licensing options. Accepted papers must be presented at the workshop by one of the authors, but in special cases we may consider remote presentation. The official publication date is the date the proceedings are made available in the ACM Digital Library. This date may be up to two weeks prior to the first day of the workshop. PROGRAM CHAIRS: Mike Sperber Active Group, Germany Graham Hutton University of Nottingham, UK PROGRAM COMMITTEE: Joachim Breitner Germany Manuel Chakravarty Tweak & IOG, The Netherlands Ron Garcia University of British Columbia, Canada Debasish Ghosh LeadIQ, India Lars Hupel Giesecke+Devrient, Germany Andy Keep Meta, USA Shriram Krishnamurthi Brown University, USA Andres Löh Well-Typed, Germany Anil Madhavapeddy University of Cambridge, UK José Pedro Magalhães Standard Chartered, UK Simon Marlow Meta, UK Hannes Mehnert Robur, Germany Erik Meijer USA Ivan Perez KBR / NASA Ames Research Center, USA Stefanie Schirmer DuckDuckGo, Germany Perdita Stevens University of Edinburgh, UK Stefan Wehr Hochschule Offenburg, Germany Scott Wlaschin FPbridge, UK WORKSHOP VENUE: The workshop will be co-located with the ICFP 2023 conference at The Westin Seattle Hotel, Seattle, Washington, United States. ====================================================================== This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please contact the sender and delete the email and attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. Email communications with the University of Nottingham may be monitored where permitted by law.

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Re: [Haskell-cafe] dynamic web form generation for algebraic data types
by Olaf Klinke 14 Mar '23

14 Mar '23

> > From briefly reading the wiki page > https://wiki.haskell.org/Tangible_Value, it looks like it relies on > Applicative functors for combining values. > So maybe the missing piece for sum-types was Selective functors > https://hackage.haskell.org/package/selective? > > Gustavo Bicalho > Well spotted! I did not know selective applicative functors (SAFs), thanks for mentioning! Indeed `branch` seems to be all that is necessary to get forms for sum types going. In the talk [1] Andrey mentions that SAFs have a bind, but only for enumerable inputs. The papers state that "all effects are declared statically". If we equate "effect" with "form input" then for recursive types like lists this would mean to pre-define an infinite number of fields and have the user select a finite number of them. I wonder whether that is feasible with html forms. Maybe forms (in the html sense) are a red herring for what I am after. Both the Grace and tangible values demos immediately process changes to inputs, there is no distinction between inputting the data and having the data processed: they are event-driven systems. As is JavaScript with its `oninput` and `onchange` functions. So there are two sub-problems here: The first problem is to programmatically generate html elements by JavaScript functions that can build all finite values of a given Generic Haskell type, and nothing else. The second problem is to scrape the thusly generated elements and re-assemble them into a Haskell value on the server side. The second problem is usually solved by html forms, but there may be other means. Olaf [1] https://dl.acm.org/doi/abs/10.1145/3341694#

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Just released: cabal 3.10.1.0
by Mikolaj Konarski 13 Mar '23

13 Mar '23

Dear cabal users and contributors, The cabal team is proud to announce the release of cabal 3.10.1.0. This is mainly a bugfix release, but it has some new features and enhancements as well. The thread about the release, including troubleshooting and porting discussions, is at https://discourse.haskell.org/t/just-released-cabal-3-10-1-0/5978 The changelogs and release notes are at https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.… and, if your code depends on the Cabal library, at https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.10.1.0.md Two backward (in)compatibility notes may be of particular interest: the XDG Base Directory Specification (conditionally) replacing ~/.cabal and the `--enable-documentation` option by default added to all `cabal haddock` invocations. Please look them up at the links above. Let me finish by thanking our esteemed benefactors, past and present, contributing code, devops, testing, feedback, comments. Representing these are the authors of all PRs included in the 3.10.1.0 release, honourably mentioned in the list of fame below. Abastro Alexander Biehl Alexey Radkov amigalemming Andrea Bedini Andreas Abel Andreas Klebinger Artem Pelenitsyn Ben Gamari Bodigrim Brandon Chinn Bryan Richter Byron Johnson Cheng Shao chowells79 Cmdv Colton Clemmer cydparser Daniel Gröber deltaspace0 Evgenii Akentev fendor Francesco Ariis Francesco Gazzetta Gautier DI FOLCO Georgi Lyubenov Gershom Bazerman Guillaume Genestier Hécate Moonlight Ikko Ashimine instinctive Jade Lovelace James Hobson Jan Synáček Jappie Klooster Javier Neira John Ericson Kobayashi Marcin Szamotulski Martijn Bastiaan Matthew Pickering Max Amanshauser Miezhiko Mike Pilgrem Musab Guma'a Patrick Dougherty Paweł Dybiec Pierre Le Marre Robert Vollmert Ross Paterson Saad Ahmed Sergey Vinokurov sheaf Sören Tempel Sylvain Henry Tom McLaughlin Troels Henriksen Vilius Panevėžys Vladislav Zavialov Wismill

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[ANNOUNCE] GHC 9.6.1 is now available
by Ben Gamari 12 Mar '23

12 Mar '23

The GHC team is very pleased to announce the availability of GHC 9.6.1. As usual, binaries and source distributions are available at downloads.haskell.org: https://downloads.haskell.org/ghc/9.6.1/ Beginning with GHC 9.6.1, GHC can be built as a cross-compiler to WebAssembly and JavaScript. This is an important step towards robust support for compiling Haskell to the Web, but there are a few caveats to be aware of in the 9.6 series: - Both the Javascript and WebAssembly backends are still at an early stage of development and are present in this release as a technology preview - Using GHC as a cross-compiler is not as easy as we would like it to be; in particular, there are challenges related to Template Haskell - GHC is not yet run-time retargetable; a given GHC binary targets exactly one platform, and both WebAssembly and JavaScript are considered platforms for this purpose. Cross-compilers must be built from source by their users We hope to lift all of these limitations in future releases. Additionally, 9.6.1 includes: - Significant latency improvements in the non-moving garbage collector - Efficient runtime support for delimited continuations - Improvements in compiler error messages - Numerous improvements in the compiler's memory usage See the [release notes] for a comprehensive accounting of changes in this release. As always, one can find a migration guide to aid in transitioning from older releases on the [GHC Wiki][migration-guide]. We have also recently started extending our release process to cover a wider set of Linux distributions. In particular, we now offer Rocky 8 and Ubuntu 20.04 binary distributions which cover RedHat-derivative and distributions using older glibc releases (namely 2.27), respectively. Thanks to everyone who has contributed code, documentation, testing, and tickets to this release process. As this release represents upstream GHC's first step towards supporting web targets, we are very excited to have this release out the door! Cheers, - Ben [ticket]: https://gitlab.haskell.org/ghc/ghc/issues/ [migration-guide]: https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.6 [release notes]: https://downloads.haskell.org/ghc/9.6.1/docs/users_guide/9.6.1-notes.html

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ANN: hledger-1.29
by Simon Michael 11 Mar '23

11 Mar '23

I'm pleased to announce hledger 1.29 ! https://github.com/simonmichael/hledger/releases/1.29 https://hledger.org/install https://hledger.org/release-notes.html#hledger-1-29 Highlights: Tag checking, flexible multi-period start dates, flexible cost/conversion posting combining, new commands list, hledger manual reorg, easier close command, 10% more Ledger file compatible. Thank you to release contributors Chris Lemaire, Caleb Maclennan, Jonathan Dowland, J. B. Rainsberger, Michael Grünewald, Robert Nielsen, and Yann Büchau. What is hledger ? - Fast, reliable, free, multicurrency, double-entry, plain text accounting[1] software that runs on unix, mac, windows, and the web - Built around human-readable, version-controllable plain text files - Inspired by and largely compatible with Ledger CLI[2]; convertible to and from Beancount[3] - Written in Haskell for correctness and longevity. For help getting started, or more info, see https://hledger.org and join our chat via Matrix or IRC: https://hledger.org/support Newcomers, experts, contributors, sponsors, feedback are welcome! Aloha, -Simon [1] https://plaintextaccounting.org [2] https://ledger-cli.org [3] https://beancount.github.io

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ANN: Haskell Tiny Game Jam 2023 Results
by Simon Michael 10 Mar '23

10 Mar '23

We are very pleased to announce.. the results of Haskell Tiny Game Jam 2023 ! Congratulations and thanks to all participants! - 55 entries in 4 categories from 28 entrants in 3 weeks - 109 reviews, 5 winners and 6 honourable mentions from 2 judges - Shell script to browse and play the games on all major platforms (single binary coming later maybe) - Readable source versions, useful development tips, informative blog posts This was the first Haskell game dev contest. The prize.. glory! Also fun, learning, and advancing Haskell's suitability for game dev and programming in the small. We invite you to come and play, read, and get inspired for the next one! https://github.com/haskell-game/tiny-games-hs

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