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Logtalk 3.56.0 released
by Paulo Moura 09 Jun '22

09 Jun '22

Hi, Logtalk 3.56.0 is now available for downloading at: https://logtalk.org/ This release adds linter warnings for source file names and for if-then-else and soft-cut control constructs; improves the linter warnings for "findall/3" goals; adds support for calls to the database and reflection built-in methods where the predicate argument is only bound at runtime and is listed in a "uses/2" or "use_module/2" directive; fixes cases where predicate name conflicts in directives would not be reported; improves "arbitrary" library performance for several types; fixes issues with the "arbitrary" library generation of Unicode code points; provides an improved QuickCheck implementation; improves the "lgtunit" tool code coverage report format to enable reporting all test object parameterizations and files; adds linter warnings for missing documentation directives to the "lgtdoc" tool; improves performance of the "diagrams" tool; improves the documentation of libraries and tools; adds new tests and improves existing tests for Prolog standards compliance; and includes portability updates Scryer Prolog, SICStus Prolog, and Tau Prolog. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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PPDP 2022 - 2nd Call for Papers
by Manuel Hermenegildo 05 May '22

05 May '22

[ Apologies for multiple postings ] =============================== PPDP 2022 - 2nd Call for Papers =============================== 24th International Symposium on Principles and Practice of Declarative Programming 20-22 September 2022, Tbilisi, Georgia Co-located with LOPSTR 2022 as part of CLAS 2022 The conference will be held as a hybrid (blended) meeting, both in-person and virtual. https://software.imdea.org/Conferences/PPDP2022/ ================================================= Latest news: - Invited speakers announced. - Conference to be held as blended meeting, in-person and virtual. - Proceedings published by ACM in the ICPS series. - A selection of the best papers will be invited for submission to TPLP as rapid publications. ================================================= Important Dates --------------- - 15.05.2022 AoE title and abstract submission - 22.05.2022 AoE paper submission - 29.06.2022 rebuttal period (48 hours) - 09.07.2022 notification - 23.07.2022 final paper - 20.09.2022 conference starts About PPDP ---------- The PPDP symposium brings together researchers from the declarative programming communities, including those working in the functional, logic, answer-set, and constraint handling programming paradigms. The goal is to stimulate research in the use of logical formalisms and methods for analyzing, performing, specifying, and reasoning about computations, including mechanisms for concurrency, security, static analysis, and verification. Scope ----- Submissions are invited on all topics related to declarative programming, from principles to practice, from foundations to applications. Topics of interest include, but are not limited to: - Language Design: domain-specific languages; interoperability; concurrency, parallelism and distribution; modules; functional languages; reactive languages; languages with objects; languages for quantum computing; languages inspired by biological and chemical computation; metaprogramming. - Declarative languages in artificial intelligence: logic programming; database languages; knowledge representation languages; probabilistic languages; differentiable languages. - Implementations: abstract machines; interpreters; compilation; compile-time and run-time optimization; memory management. - Foundations: types; logical frameworks; monads and effects; semantics. - Analysis and Transformation: partial evaluation; abstract interpretation; control flow; data flow; information flow; termination analysis; resource analysis; type inference and type checking; verification; validation; debugging; testing. - Tools and Applications: programming and proof environments; verification tools; case studies in proof assistants or interactive theorem provers; certification; novel applications of declarative programming inside and outside of CS; declarative programming pearls; practical experience reports and industrial application; education. The PC chairs will be happy to advise on the appropriateness of a topic. Submission web page --------------------- https://easychair.org/conferences/?conf=ppdp2022 Submission Categories --------------------- Submissions can be made in three categories: - Research Papers, - System Descriptions, - Experience Reports. Submissions of Research Papers must present original research which is unpublished and not submitted elsewhere. They must not exceed 12 pages ACM sigconf style, 2-column (including figures, but excluding bibliography). See below for further formatting instructions. Work that already appeared in unpublished or informally published workshop proceedings may be submitted (please contact the PC chair in case of questions). Research papers will be judged on originality, significance, correctness, clarity, and readability. Submission of System Descriptions must describe a working system whose description has not been published or submitted elsewhere. They must not exceed 10 pages and should contain a link to a working system. System Descriptions must be marked as such at the time of submission and will be judged on originality, significance, usefulness, clarity, and readability. Submissions of Experience Reports are meant to help create a body of published, refereed, citable evidence where declarative programming such as functional, logic, answer-set, constraint programming, etc., is used in practice. They must not exceed 5 pages *including references*. Experience Reports must be marked as such at the time of submission and need not report original research results. They will be judged on significance, usefulness, clarity, and readability. Supplementary material may be provided via a link to an extended version of the submission (recommended), or in a clearly marked appendix beyond the above-mentioned page limits. Reviewers are not required to study extended versions or any material beyond the respective page limit. Format of a submission: For each paper category, you must follow the instructions of the new ACM Primary Article Templates. You must use the LaTeX sigconf proceedings template as the conference organizers are unable to process final submissions in other formats. In case of problems with the templates, please contact ACM's TeX support team at Aptara. Authors should note ACM's statement on author's rights which apply to final papers. Submitted papers should meet the requirements of ACM's plagiarism policy. Final publication will follow the new ACM Primary Article TAPS Publication Workflow. Invited Speakers ---------------- Niki Vazou, IMDEA Software Institute Florian Zuleger, Technische Universität Wien Program Committee ------------------ Beniamino Accattoli, Inria & LIX École Polytechnique, France (co-chair) Manuel Hermenegildo, IMDEA Software Institute and Technical U. of Madrid, Spain (co-chair) Salvador Abreu, NOVA LINCS / University of Evora, Portugal David Baelde, ENS Rennes, IRISA, France Pierre-Evariste Dagand, IRIF - CNRS, France Marina De-Vos, University of Bath, UK Esra Erdem, Sabanci University, Turkey Guilhem Jaber, Université de Nantes, France Oleg Kiselyov, Tohoku University, Japan Georg Moser, University of Innsbruck, Austria Koko Muroya, RIMS, Kyoto University, Japan Gopalan Nadathur, University of Minnesota, US Kim Nguyen, Université Paris-Sud 11, France Carlos Olarte, LIPN, Université Sorbonne Paris Nord, France Ricardo Rocha, University of Porto, Portugal Filip Sieczkowski, Heriot Watt University, UK Theresa Swift, NovaLINCS, Universidade Nova de Lisboa, Portugal Benoit Valiron, LMF - CentraleSupelec, Univ. Paris Saclay, France Jan Van den Bussche, Hasselt University, Belgium German Vidal, MiST, VRAIN, Universitat Politecnica de Valencia, Spain --------------------------------------------------------------------------- Organizing committee chair: Besik Dundua, Tbilisi State University, Georgia Steering committee chair: James Cheney, Edinburgh University, UK ---------------------------------------------------------------------------

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Logtalk 3.55.0 released
by Paulo Moura 28 Apr '22

28 Apr '22

Hi, Logtalk 3.55.0 is now available for downloading at: https://logtalk.org/ This release adds Windows PowerShell versions of the setup, integration, embedding, and tools Bash shell scripts (joint work with Hans N. Beck); includes new and improved Handbook sections; adds a library file for loading all installed packs; improves handling of file paths by the "diagrams", "lgtdoc", and "wrapper" tools; improves the documentation of the "issue_creator", "lgtunit", and "packs" tools; includes fixes and improvements for the "lgtdoc" scripts; updates the "update_html_docs.sh" and "update_svg_diagrams.sh" scripts to optionally generate packs documentation and diagrams; updates the Windows installer to copy the PowerShell integration and setup scripts to the system directory; updates documentation of the Visual Studio Code text editor Logtalk plug-in; adds new tests for official and de facto standard Prolog features; and includes portability updates Scryer Prolog, Tau Prolog, and YAP. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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Explaining why and why not with s(CASP)
by David Epstein 29 Mar '22

29 Mar '22

Hi everyone, I'm new here. I'd like to learn more about how to get human readable explanations for query answers, both why and why not. For example, with the file: scared(P1) :- no_escape(P1), faces_conflict_against(P1,P2), is_weaker_than(P1,P2). no_escape(john). faces_conflict_against(john,bob). is_weaker_than(john,bob). ?- scared(john). John is scared because all three prerequisites matched. How can I ask s(CASP) to tell me the three ways John would not be scared: (1) if he had an escape, (2) if he did not face a conflict with Bob (3) if he were not weaker than Bob. Let's say John has an escape. I'm not exactly sure how negation works yet in Ciao. "not no_escape(john)" triggers an error but "-no_escape(john)" works. Now, John is not scared. How can I ask s(CASP) to tell me what would be required to make him scared? Finally, is there a way to express that we don't know whether John has an escape? Do I simply omit that line? Then, how can I ask s(CASP) to reason through both possibilities and tell me the results? Thank you! -david

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Logtalk 3.54.0 released
by Paulo Moura 23 Mar '22

23 Mar '22

Hi, Logtalk 3.54.0 is now available for downloading at: https://logtalk.org/ This release adds a new linter warning for "catch/3" goals; adds support to user-defined linter warning messages for suspicious calls; adds a new Handbook section on the logic and control built-in public methods; improves the Handbook documentation on the term-expansion mechanism; improves documentation on applying the developer tools to plain Prolog code; adds new "union_find" and "grammars" libraries; improves the "sets" library thanks to a contribution by Adrián Arroyo Calle; adds linter checks for "format/2-3" goals to the "format" library; adds new predicates to the "pairs" library; adds new types to the "arbitrary" and "types" libraries; adds a "lgtunit" tool linter check for the use of unification goals in test outcome assertions; improves the performance of the "ports_profiler" tool; includes new predicates and fixes for the "packs" tool; fixes "lgtdoc" tool issues with Sphinx output; improves and updates examples; adds new standards compliance sets; and includes portability updates for B-Prolog, Ciao Prolog, ECLiPSe, GNU Prolog, LVM, Scryer Prolog, Tau Prolog, Trealla Prolog, and YAP. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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Logtalk 3.53.0 released
by Paulo Moura 20 Jan '22

20 Jan '22

Hi, Logtalk 3.53.0 is now available for downloading at: https://logtalk.org/ This release includes a new developer tool, "issue_creator", for automatically creating bug report issues for failed tests in GitHub or GitLab servers; adds support for using object aliases in the message delegation control construct; adds a Handbook section on calling Prolog foreign predicates; includes documentation fixes and improvements; adds new predicates to the "options" library; fixes a bug in the "intervals" library; updates the "logtalk_tester" automation script to use the new "issue_creator" tool; includes improvements to the "packs" tool; updates the "metagol" port; adds new test sets and tests for Prolog standards compliance; updates support for a new version of the Visual Studio Code text editor Logtalk plug-in; and includes portability updates for Ciao Prolog, GNU Prolog, LVM, SICStus Prolog, SWI-Prolog, Trealla Prolog, and YAP. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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Logtalk 3.52.0 released
by Paulo Moura 07 Dec '21

07 Dec '21

Hi, Logtalk 3.52.0 is now available for downloading at: https://logtalk.org/ This release fixes compiler and linter issues; includes an improved version of the new "packs" tool, a portable and decentralized package manager; adds new "dif" and "format" abstraction libraries; updates the "hook_objects", "os", and "types" libraries; includes documentation updates to the Handbook, tools, man pages, and scripts; includes fixes and improvements for the "debugger", "diagrams", "lgtunit", and "tutor" tools; updates several programming examples; provides additional Prolog standards compliance tests; provides additional Logtalk tests; and includes portability updates for GNU Prolog, LVM, Tau Prolog, Trealla Prolog, XSB, and YAP. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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A portable and decentralized package manager for sharing Logtalk and Prolog resources
by Paulo Moura 28 Oct '21

28 Oct '21

Hi, The recently released Logtalk 3.51.0 version includes a beta version of the new "packs" tool, a portable and decentralized package manager for sharing Logtalk and Prolog resources: https://logtalk.org/manuals/devtools/packs.html This tool allows anyone wishing to share their work to setup a pack registry allowing users to easily install and update those resources. Some of those pack registries are indexed at: https://github.com/LogtalkDotOrg/pack-registries The "packs" tool runs on most of the Logtalk supported backend Prolog systems (see the "Known issues" section in the first link above for current exceptions). When installing Prolog packs, Logtalk is only required to run the tool. The tool includes documentation and linter support for defining new registry and pack specifications. Feedback is most welcome. Let us know if you setup a public pack registry. Enjoy, Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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Logtalk 3.51.0 released
by Paulo Moura 28 Oct '21

28 Oct '21

Hi, Logtalk 3.51.0 is now available for downloading at: https://logtalk.org/ This release includes a beta version of the new "packs" tool, a portable and decentralized package manager; provides new "lgtunit" test outcomes and new input/output testing predicates; improves the compilation of large test sets by generating more compact code; improves the generation of Allure testing reports to include crashed and broken test sets; includes improved man pages to the testing scripts; includes "lgtdoc" tool bug fixes; improves the "make" tool; includes new "csv" library predicates; updates the os library for some backends; improves some of the programming examples; includes additional tests for Prolog compliance; fixes a Windows installer bug with settings files; and includes portability updates for all backends, notably by providing implementations of the atomic_concat/3 and atomic_list_concat/2-3 predicates. Thanks to Paul Brown, Michael T. Richter, and Doug Kearns for their contributions to this release. For details and a complete list of changes, please consult the release notes at: https://github.com/LogtalkDotOrg/logtalk3/blob/master/RELEASE_NOTES.md You can show your support for Logtalk continued development and success at GitHub by giving us a star and a symbolic sponsorship: https://github.com/LogtalkDotOrg/logtalk3 Happy logtalking! Paulo ----------------------------------------------------------------- Paulo Moura Logtalk developer

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Logtalk 3.50.0 released
by Paulo Moura 26 Oct '21

26 Oct '21

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