{"id":18627313,"url":"https://github.com/itsnickbarry/ackermann-piet","last_synced_at":"2026-01-25T02:02:29.135Z","repository":{"id":30418305,"uuid":"33971205","full_name":"ItsNickBarry/ackermann-piet","owner":"ItsNickBarry","description":"A visual journey through stack-based superexponential recursion 🎨","archived":false,"fork":false,"pushed_at":"2015-05-24T03:24:50.000Z","size":200,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-05-25T09:02:37.637Z","etag":null,"topics":["art-history","de-stijl","esoteric","piet-mondrian","wow"],"latest_commit_sha":null,"homepage":"","language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/ItsNickBarry.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE.md","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2015-04-15T03:31:22.000Z","updated_at":"2018-06-27T23:39:13.000Z","dependencies_parsed_at":"2022-09-13T10:40:35.397Z","dependency_job_id":null,"html_url":"https://github.com/ItsNickBarry/ackermann-piet","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/ItsNickBarry/ackermann-piet","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ItsNickBarry%2Fackermann-piet","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ItsNickBarry%2Fackermann-piet/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ItsNickBarry%2Fackermann-piet/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ItsNickBarry%2Fackermann-piet/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/ItsNickBarry","download_url":"https://codeload.github.com/ItsNickBarry/ackermann-piet/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ItsNickBarry%2Fackermann-piet/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28741634,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-25T01:40:51.112Z","status":"online","status_checked_at":"2026-01-25T02:00:06.841Z","response_time":113,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["art-history","de-stijl","esoteric","piet-mondrian","wow"],"created_at":"2024-11-07T04:41:54.379Z","updated_at":"2026-01-25T02:02:29.116Z","avatar_url":"https://github.com/ItsNickBarry.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# The Ackermann function, in Piet\nThis repository contains an implementation of the Ackermann function in the Piet language.\n\nThe code is a [visual experience][code].\n\n[code]: ./lib/ackermann-piet.png\n\n## The Ackermann Function\nThe Ackermann function, named for Wilhelm Ackermann, is an example of a total computable function which is not primitive recursive.  As the value of its arguments increases linearly, the time required to compute it increases superexponentially.\n\n### Links\n* The [Ackermann function][wiki] on Wikipedia.\n* The [Ackermann function][youtube] on the Computerphile YouTube channel.\n\n[wiki]: https://en.wikipedia.org/wiki/Ackermann_function\n[youtube]: https://www.youtube.com/watch?v=i7sm9dzFtEI\n\n## Piet\nPiet is a stack-based programming language which consists of images rather than text.  It was written by David Morgan-Mar, prolific author of esoteric programming languages, and named after Dutch painter Piet Mondrian.  The interpreter provides a formalistic analysis of a program's content.  Iconographic elements are analogous to code comments.\n\n### Links\n* [Piet Mondrian][mondrian] on Wikipedia.\n* [Piet][dangermouse] on David Morgan-Mar's website.\n* [PietDev][pietdev], a Piet IDE and debugger by Oscar Rodríguez used in the creation of this program.\n* The [Piet Assembler][assembler], a program by Sergei Lewis which reads text commands and generates Piet code, such as the text output portion of this program.\n\n[mondrian]: https://en.wikipedia.org/wiki/Piet_Mondrian\n[dangermouse]: http://www.dangermouse.net/esoteric/piet.html\n[pietdev]: http://www.rapapaing.com/blog/?page_id=6\n[assembler]: http://www.toothycat.net/wiki/wiki.pl?MoonShadow/Piet\n\n## Known Issues\n* Program contains black pixels, which seems like cheating.\n* Program is kind of ugly overall.\n* Does not seem to work with npiet.  Only successfully tested in PietDev.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitsnickbarry%2Fackermann-piet","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fitsnickbarry%2Fackermann-piet","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitsnickbarry%2Fackermann-piet/lists"}