February 2022 - Haskell-Cafe

Any chances to fetch data from Vertica DB?
by Geraldus 11 Feb '22

11 Feb '22

Hi, dear Café! I'm trying to figure out if there is any way to connect and fetch data from the Vertica database? I got used to the amazing `esqueleto` package, and ideally, I'm looking for a way to use type-safe queries. Albeit at the moment raw SQL queries would be sufficient. Any feedback would be appreciated!

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C binding <-> safer haskell API
by PICCA Frederic-Emmanuel 10 Feb '22

10 Feb '22

Hello, I try to create a binding for a C library I can find something like this in the c library merge(HklCube *cube, const HklFrame *frame) So I create a binding with binding-DSL #ccall merge, Ptr <HklCube> -> Ptr <HklFrame> -> IO () Now I want to create a higher level API whcich encode the fact that the cube is modified after the merge. So what is the best way to encode this in the type ? merge :: _ merge c f = do .... c'merge pc pf I thought about IORef, but I am not sure thaht this is the right way to have a safer haskell interface for this method. thanks for your help Fred

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Haskell Foundation Stability Working Group
by Chris Dornan 10 Feb '22

10 Feb '22

Hi Everyone, This is to announce the formation of the Haskell Foundation Stability Working Group <https://github.com/haskellfoundation/stability>, a new working group for for studying and promoting stability in the Haskell ecosystem. Check out our our home page <https://github.com/haskellfoundation/stability> (https://github.com/haskellfoundation/stability) where you can read about who we are, and what we do and are doing (and have been doing). We meet on a call about once a fortnight – let us know if you would like to join any of our calls or raise any topic with the group (the e-list for contacting the group is on the home page). Chris Dornan for the Haskell Foundation Stability Working Group

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current status of cloud haskell?
by stuebinm 09 Feb '22

09 Feb '22

Hi all! I've been meaning to do more with concurrent (and parallel) haskell, and having looked around a bit on hackage (and being a fan of Erlang's OTP) the cloud haskell packages seem like a dream come true. But only at first glance — the last release of distributed-process [1], which looks to be the main library, was in 2018, and many of the other packages are older. The "recent news" section of the website [2] even has its last entry from 2016! So I'd be assuming that the project has been abandoned, yet on github [3] it looks to still be (comparatively) alive and well, with activity just a few months ago. So what's the current status there? Is anyone here using it productively, or involved in its development / knows if or when to expect a new release? thanks! ~stuebinm [1] https://hackage.haskell.org/package/distributed-process [2] http://haskell-distributed.github.io/ [3] https://github.com/haskell-distributed/distributed-process

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Haskell Foundation seeks new Executive Director
by Richard Eisenberg 09 Feb '22

09 Feb '22

Hi all, Following Andrew Boardman's resignation announcement [1] yesterday, the Haskell Foundation is seeking a new Executive Director. The job ad appears below. Note that we are eager to identify our next leader, and so the turnaround is tight -- we will fully consider only applications received by the end of Feb 22 (anywhere on Earth). Please spread the word, recommend folks to consider, use your networks, etc! Feel free to post here or reach out to me with any questions. Job ad home: https://haskell.foundation/careers/ed.html [1]: https://discourse.haskell.org/t/haskell-foundation-executive-director-chang… ------------------------------ # Executive Director ## About the Haskell Foundation The Haskell Foundation (HF) is an independent, non-profit organization dedicated to broadening the adoption of Haskell, by supporting its ecosystem of tools, libraries, education, and research. ## The Role HF seeks a full-time Executive Director (ED) to continue to inspire and develop the organization. The ED is responsible for furthering HF’s mission and vision, ensuring that resources are in place to accomplish its goals. The ED will drive sourcing for sponsorships, structure the organization, recruit and channel the efforts of both volunteers and paid staff. Working with HF's Board of Directors, the ED will articulate HF’s strategic priorities and direction. They will assess and evaluate strategies, hire teams, set budgets, forge alliances, and build partnerships to further the mission. The ED will play a crucial role in building the culture of HF around community service. HF will succeed if and only if it succeeds in unlocking the expertise and enthusiasm of volunteer members of the community. This will be a major goal for the ED, so that volunteers find HF to be a solid professional home with ample opportunities for recognition and professional growth. Finally, the ED will actively promote HF to build its financial reserves and goodwill. They will secure, budget, and allocate resources appropriately and hold themselves accountable for the financial health of the organization. ## Reporting Relationships The ED reports to the Board of Directors. All other members of staff and volunteers report directly or indirectly to the ED. ## Responsibilities **Organization Mission and Strategy**: Works with the Board and staff to ensure that the mission is fulfilled. * Responsible for the implementation of volunteer programs that carry out the organization’s mission. * Responsible for recruiting existing community projects to affiliate with HF, and for assessing their ongoing adherence to HF standards. * Responsible for the enhancement of HF’s image by being engaged with the community and by working closely with other professional and private organizations. * Be the public face of HF through public presentations at Haskell-related events. * Cultivate excellent relationships with the community and operate HF’s social media presence. **Organization Operations**: Oversees and implements appropriate resources to ensure that the operations of the organization are appropriate. * Responsible for the hiring and retention of competent, qualified staff as financial resources permit. * Responsible for the effective administration of HF’s operations. * Responsible for signing all notes, agreements, and other instruments made and entered into and on behalf of the organization. * Responsible for fiscal management that generally anticipates operating within the approved budget, ensures maximum resource utilization, and maintenance of the organization in a positive financial position. **Viability**: Develops financial resources sufficient to ensure the sustainability of the organization. * Responsible for fundraising and developing other revenues necessary to support HF’s mission. * Participate in identifying and cultivating corporate, institutional and individual sponsors. **Board Governance**: Works with the Board to help it enact HF’s mission. * Responsible for leading HF in a manner that supports the organization’s mission. * Responsible for communicating effectively with the Board and providing, in a timely and accurate manner, all information necessary for the Board to function properly and to make informed judgements. * Ensure that HF is in compliance with relevant state and federal laws, regulations and with standard accounting procedures. * Work with individual Board members and subcommittees as directed by the Board. * Inform the Board regularly of internal organization matters, including relevant staffing, funding and program success and priorities. * Responsible for the fiscal integrity of HF, ensure that the Board is able to monitor the financial condition of HF. This means preparing budgets and financial statements which accurately reflect the financial condition of the organization and are kept up to date. ## Salary and Employment The ED can live anywhere in the world – remote working is the standard within HF. The ED must be eligible under USA law and the law in their jurisdiction to perform work (as an employee or as a contractor) for a non-profit organization incorporated in the USA. Salary will be commensurate with the experience and qualities of the candidate, and will also reflect the Foundation’s status as a non-profit organization funded by donations. ## Key Credentials and Personal Qualities Candidates are encouraged to apply with the expectation that the Board will assist and coach in areas of personal development tailored to the successful candidate’s needs. **Essential attributes:** * Successful experience in development and organizational leadership in a non-profit or business setting. * Self-starter, with strong motivational and staff leadership abilities. * Demonstrated knowledge, via experience or an advanced degree in CS, math or a related technical field. * Willingness to execute fundraising plans and strategies that generate significant results. * Commitment to results; “can-do" mindset with emphasis on accountability. * Exceptional in communicating verbally and in written language. * Integrity and impeccable work ethic. **Desirable attributes:** * Experience at change management. * Experience in writing persuasive materials including successful appeals, proposals, presentations, stewardship materials, and other collateral. * Knowledge of the Haskell community and its dynamics. HF celebrates diversity and inclusion, and does not discriminate on an individual’s identity characteristics. Under-represented minorities are especially encouraged to apply. ## Application Process Interested candidates should submit a resume and thoughtful cover letter outlining how their skills and experience meet the qualifications of the position, and their vision for the Foundation. Send to nominations(a)haskell.foundation. If you have any questions about the position, feel free to email chair(a)haskell.foundation. Closing date: Tuesday, February 22, 2022.

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Re: [Haskell-cafe] optparse-applicative with attoparsec parser
by Sébastien Leblanc 07 Feb '22

07 Feb '22

> > Date: Fri, 4 Feb 2022 15:09:41 +0100 (CET) > From: PICCA Frederic-Emmanuel > <frederic-emmanuel.picca(a)synchrotron-soleil.fr> > To: haskell-cafe(a)haskell.org > Subject: [Haskell-cafe] optparse-applicative with attoparsec parser > Message-ID: > < > 30404406.15581346.1643983781075.JavaMail.zimbra(a)synchrotron-soleil.fr> > > Content-Type: text/plain; charset=utf-8 > > Hello, > > I Try to write a parser for this command line > > binoculars-ng --debug process data/test/config_sixs_ruche_flymedv_3.ini > 698-734 735-736 > > But I have this problem > > Invalid argument `735-736' > > The parser used for this is this one > > processOptions :: Parser Options > processOptions = Process > <$> optional config > <*> optional (argument (eitherReader (parseOnly > configRangeP . pack)) (metavar "RANGE")) > > it use the configRangeP attoparser parser whcih knows how to deal with the > string "698-734 735-736" > > configRangeP :: Parser ConfigRange > configRangeP = ConfigRange <$> (inputRangeP `sepBy` many (satisfy isSep)) > where > isSep :: Char -> Bool > isSep c = c == ' ' || c == ',' > > the result should be this one > > Just (ConfigRange [InputRangeFromTo 698 734,InputRangeFromTo 735 736]) > > so my question how should I fix my processOptions fucntion in order to > deal with this problem. > > thanks for considering > It seems that the issue stems from having your arguments separated by spaces. If your parser is parsing [[ [debug-flag] <command> <file> <ranges> ]], then it does not know what to do with the last particle (735-736). You would need to wrap your ranges in quotes in your shell, to include the space, or replace the space with a comma instead (698-734,735-736) Sébastien

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Haskell Developer Roles at Standard Chartered Bank (UK and SG)
by J. Stutterheim 07 Feb '22

07 Feb '22

Hi all, I'm happy to report that my team at Standard Chartered Bank is hiring Haskell programmers! We're currently hiring in London, and we expect to open positions in Singapore soon. If you're interested in writing Haskell code for mission-critical cloud-based applications, this is the job for you. Financial knowledge is not required, as there will be plenty of opportunity to pick it up on the job. If you're interested in having a chat, please apply through the following link: https://scb.taleo.net/careersection/ex/jobdetail.ftl?job=2200001642&lang=en After applying through the link above, please shoot me an email at `jurrien dot stutterheim at sc dot com` so that I know that you have applied. Best regards, Jurriën

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How can I get a list of all English words?
by Amber Crawford 06 Feb '22

06 Feb '22

I'm creating a project in which I need a list of every English word, so I'm wondering how I would get this. The only thing I need is that I can filter the words based on some boolean function, thanks. btw I'm pretty beginner so sry If i'm not really good at writing these.

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optparse-applicative with attoparsec parser
by PICCA Frederic-Emmanuel 04 Feb '22

04 Feb '22

Hello, I Try to write a parser for this command line binoculars-ng --debug process data/test/config_sixs_ruche_flymedv_3.ini 698-734 735-736 But I have this problem Invalid argument `735-736' The parser used for this is this one processOptions :: Parser Options processOptions = Process <$> optional config <*> optional (argument (eitherReader (parseOnly configRangeP . pack)) (metavar "RANGE")) it use the configRangeP attoparser parser whcih knows how to deal with the string "698-734 735-736" configRangeP :: Parser ConfigRange configRangeP = ConfigRange <$> (inputRangeP `sepBy` many (satisfy isSep)) where isSep :: Char -> Bool isSep c = c == ' ' || c == ',' the result should be this one Just (ConfigRange [InputRangeFromTo 698 734,InputRangeFromTo 735 736]) so my question how should I fix my processOptions fucntion in order to deal with this problem. thanks for considering Frederic

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Asking for advice on category for a paper for ICFP
by Anton Kholomiov 02 Feb '22

02 Feb '22

Hi! I'm trying to write a paper for ICFP, This is my first paper of this kind. Can you please help me to choose the right category for it? The paper is about a novel technique of implementation of FRP. I've studied the Haskell FRP zoo and I can confirm that it's novel. In my opinion it's very elegant and simple, but of course I'm biased :) So far so good. Can you please help me to choose the right category for it? Is it a normal research paper or is it a functional pearl? So the FRP is an old technique, but I propose a novel variant of implementation which I hope is easy to study even in normal class rooms and does not contain unsafePerform tricks. Cheers, Anton

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