maths/moodle-qtype_stack
Oct 2024 – Feb 2026
14 Months active
Languages Used
MarkdownMaximaPHPCSSHTMLJavaScriptLispMaxima Lisp
Technical Skills
Backend DevelopmentCode OrganizationCode RefactoringDocumentationDocumentation ManagementLicensing
Chris Sangwin
PROFILE
Chris Sangwin
C.J. Sangwin contributed to the maths/moodle-qtype_stack repository by expanding its Topics Library with new example questions focused on proofs and linear algebra, enhancing the breadth and depth of educational resources available to students and educators. He implemented these features using Maxima and STEX, integrating content seamlessly with Moodle through PHP and Git-based workflows. In addition, he developed a formal inductive proof for the sum of cubes identity, strengthening the correctness and reliability of the platform’s mathematical tooling. Sangwin’s work established a scalable foundation for future content growth and improved the quality and trustworthiness of the educational technology.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
438Total
Bugs
67
Commits
438
Features
159
Lines of code
1,460,491
Activity Months14
Your Network
42 peopleWork History
February 2026
5 Commits • 2 Features
Feb 1, 2026Feb 2026 monthly summary for maths/moodle-qtype_stack: Key features delivered: - CI/CD automation for website and Moodle STACK plugin deployment and tests, enabling faster, more reliable releases and reduced manual testing effort. - Documentation and accessibility improvements to improve readability, clarify feedback sections, and enhance accessibility formatting. Major bugs fixed: - Educational content quality fixes addressing a typo in the chain rule expression and ensuring consistent calculus notation across the fact sheet and rules section. Overall impact and accomplishments: - Accelerated development velocity through automated deployment and testing pipelines. - Improved accuracy and consistency of educational content, contributing to better learner outcomes and reduced support effort. - Enhanced documentation quality and accessibility, supporting compliance and broader usability. Technologies/skills demonstrated: - PHP code updates in qtype_stack.php for content accuracy. - GitHub Actions/CI/CD workflows and deployment/test automation. - Documentation best practices and accessibility formatting.
5 Commits • 2 Features
Feb 1, 2026Feb 2026 monthly summary for maths/moodle-qtype_stack: Key features delivered: - CI/CD automation for website and Moodle STACK plugin deployment and tests, enabling faster, more reliable releases and reduced manual testing effort. - Documentation and accessibility improvements to improve readability, clarify feedback sections, and enhance accessibility formatting. Major bugs fixed: - Educational content quality fixes addressing a typo in the chain rule expression and ensuring consistent calculus notation across the fact sheet and rules section. Overall impact and accomplishments: - Accelerated development velocity through automated deployment and testing pipelines. - Improved accuracy and consistency of educational content, contributing to better learner outcomes and reduced support effort. - Enhanced documentation quality and accessibility, supporting compliance and broader usability. Technologies/skills demonstrated: - PHP code updates in qtype_stack.php for content accuracy. - GitHub Actions/CI/CD workflows and deployment/test automation. - Documentation best practices and accessibility formatting.
February 2026
October 2025
14 Commits • 2 Features
Oct 1, 2025October 2025 — Delivered notable feature and reliability improvements for maths/moodle-qtype_stack, with a focus on correctness, user guidance, and release readiness. Key features include explicit surd simplification controls with accompanying tests, and a new Introductory-Mathematics category. Major bug fixes include clearer chained-inequality messages, and robust noun handling in algebraic equivalence and ATDiff. Built-in functions (max/min) are now protected from redefinition, enhancing robustness. All changes were supported by expanded test coverage, documentation, and CI/infrastructure updates to streamline releases.
October 2025
14 Commits • 2 Features
Oct 1, 2025October 2025 — Delivered notable feature and reliability improvements for maths/moodle-qtype_stack, with a focus on correctness, user guidance, and release readiness. Key features include explicit surd simplification controls with accompanying tests, and a new Introductory-Mathematics category. Major bug fixes include clearer chained-inequality messages, and robust noun handling in algebraic equivalence and ATDiff. Built-in functions (max/min) are now protected from redefinition, enhancing robustness. All changes were supported by expanded test coverage, documentation, and CI/infrastructure updates to streamline releases.
September 2025
13 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for maths/moodle-qtype_stack focusing on numerical exactness, test coverage, and security improvements. Implemented test-suite modernization for subscript rendering; enhanced rational/float handling for exact decimals; improved user feedback for semicolon-separated lists/sets; fixed LaTeX display for negative imaginary parts; added a security filter to prevent redefining built-ins as variables. Result: stronger reliability for automated assessments and safer runtime behavior, with improved documentation forthcoming.
13 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for maths/moodle-qtype_stack focusing on numerical exactness, test coverage, and security improvements. Implemented test-suite modernization for subscript rendering; enhanced rational/float handling for exact decimals; improved user feedback for semicolon-separated lists/sets; fixed LaTeX display for negative imaginary parts; added a security filter to prevent redefining built-ins as variables. Result: stronger reliability for automated assessments and safer runtime behavior, with improved documentation forthcoming.
September 2025
August 2025
42 Commits • 17 Features
Aug 1, 20252025-08 summary for maths/moodle-qtype_stack: Licensing documents restructuring, CI release hygiene and environment upgrades, and feature enrichments with UX improvements and richer documentation. The period also included substantial testing and healthcheck work, plus analytics-friendly metadata changes to support product decisions. These changes improve licensing compliance, release reliability, rendering accuracy, test coverage, and maintainability.
August 2025
42 Commits • 17 Features
Aug 1, 20252025-08 summary for maths/moodle-qtype_stack: Licensing documents restructuring, CI release hygiene and environment upgrades, and feature enrichments with UX improvements and richer documentation. The period also included substantial testing and healthcheck work, plus analytics-friendly metadata changes to support product decisions. These changes improve licensing compliance, release reliability, rendering accuracy, test coverage, and maintainability.
July 2025
40 Commits • 10 Features
Jul 1, 2025Month: 2025-07. This period focused on robustness, correctness, and release readiness for maths/moodle-qtype_stack. The work combined bug fixes, feature refinements, and codebase discipline to deliver sustained business value and maintainability. 1) Key features delivered - Added validations for filename and directory name length in CLI stacklibrary checks to prevent path-related failures and improve validation reliability. (commits 65c92228e874076a8b03a783642ab37173cc8e55; 1031d2eb0c8d5f6bc57486164cb163e3c7ebfa01) - Introduced and documented enhancements to equivalence reasoning, including better documentation on symbols and a refactor separating equational vs expression reasoning for clearer logic and easier maintenance. (commits variables in description) - New rules-based simplifier enhancements: added ratAdd and ratLow to expand simplification capabilities and improve automated reasoning efficiency. (commit 61ec027901e08b4729b90623f2398242c8435341) - Documentation updates for Proof assessment and general docs to improve onboarding and knowledge transfer. (multiple commits under Documentation updates for Proof assessment and docs) - Code tidying and cleanup across the codebase, including EQUIVZERO cleanup and deduplicating/renaming code paths to simplify maintenance. (several commits: Code tidy, EQUIVZERO cleanup, etc.) - Release readiness: Moodle 4.10.0 Release Candidate preparation to accelerate timely delivery and provide stakeholders with a stable RC.
40 Commits • 10 Features
Jul 1, 2025Month: 2025-07. This period focused on robustness, correctness, and release readiness for maths/moodle-qtype_stack. The work combined bug fixes, feature refinements, and codebase discipline to deliver sustained business value and maintainability. 1) Key features delivered - Added validations for filename and directory name length in CLI stacklibrary checks to prevent path-related failures and improve validation reliability. (commits 65c92228e874076a8b03a783642ab37173cc8e55; 1031d2eb0c8d5f6bc57486164cb163e3c7ebfa01) - Introduced and documented enhancements to equivalence reasoning, including better documentation on symbols and a refactor separating equational vs expression reasoning for clearer logic and easier maintenance. (commits variables in description) - New rules-based simplifier enhancements: added ratAdd and ratLow to expand simplification capabilities and improve automated reasoning efficiency. (commit 61ec027901e08b4729b90623f2398242c8435341) - Documentation updates for Proof assessment and general docs to improve onboarding and knowledge transfer. (multiple commits under Documentation updates for Proof assessment and docs) - Code tidying and cleanup across the codebase, including EQUIVZERO cleanup and deduplicating/renaming code paths to simplify maintenance. (several commits: Code tidy, EQUIVZERO cleanup, etc.) - Release readiness: Moodle 4.10.0 Release Candidate preparation to accelerate timely delivery and provide stakeholders with a stable RC.
July 2025
June 2025
47 Commits • 16 Features
Jun 1, 2025June 2025 summary for maths/moodle-qtype_stack: Delivered essential bug fixes, CI improvements, and content/library updates with clear business value. Core feature/CI work included reinstating SBCL in the Moodle CI and adding Moodle 5.0 to the CI workflow, improving build stability and compatibility. Library and data quality improvements encompassed tidying stacklibrary categories, fixing broken questions, and updating gitsync data and metadata (questions, topics, and categories). A new test framework extension for noun_simp.mac (PHP) and extensive documentation updates expanded test coverage and developer ergonomics. Key bug fixes covered core arithmetic and parsing issues (e.g., intPow and oneDiv fixes for issue #1484; noun_simp bug), ATAlgEquiv edge-case, multiplication signs handling, PHP 7.4 JSON rounding issues, and improvements in string input validation messages. Additional reliability gains came from XML/docs fixes, bulk testing enhancements (todo blocks), and CI configuration updates.
June 2025
47 Commits • 16 Features
Jun 1, 2025June 2025 summary for maths/moodle-qtype_stack: Delivered essential bug fixes, CI improvements, and content/library updates with clear business value. Core feature/CI work included reinstating SBCL in the Moodle CI and adding Moodle 5.0 to the CI workflow, improving build stability and compatibility. Library and data quality improvements encompassed tidying stacklibrary categories, fixing broken questions, and updating gitsync data and metadata (questions, topics, and categories). A new test framework extension for noun_simp.mac (PHP) and extensive documentation updates expanded test coverage and developer ergonomics. Key bug fixes covered core arithmetic and parsing issues (e.g., intPow and oneDiv fixes for issue #1484; noun_simp bug), ATAlgEquiv edge-case, multiplication signs handling, PHP 7.4 JSON rounding issues, and improvements in string input validation messages. Additional reliability gains came from XML/docs fixes, bulk testing enhancements (todo blocks), and CI configuration updates.
May 2025
15 Commits • 8 Features
May 1, 2025May 2025 monthly summary for maths/moodle-qtype_stack focused on reliability, performance, and usability of algebraic reasoning features used in automated grading and problem generation. Implemented conditional equivalence testing, strengthened algebraic equivalence evaluation, improved error handling and math rendering, and reinforced code quality to support scalable testing and maintainability. Overall, these changes reduce timeouts, improve accuracy of answer tests, and provide clearer feedback for users and contributors.
15 Commits • 8 Features
May 1, 2025May 2025 monthly summary for maths/moodle-qtype_stack focused on reliability, performance, and usability of algebraic reasoning features used in automated grading and problem generation. Implemented conditional equivalence testing, strengthened algebraic equivalence evaluation, improved error handling and math rendering, and reinforced code quality to support scalable testing and maintainability. Overall, these changes reduce timeouts, improve accuracy of answer tests, and provide clearer feedback for users and contributors.
May 2025
April 2025
20 Commits • 8 Features
Apr 1, 2025In April 2025, the maths/moodle-qtype_stack repository delivered a set of targeted feature improvements and reliability fixes that strengthen authoring, distribution, and maintenance of STACK questions. The work enhances interactive question authoring, improves download reliability, tightens algebraic logic, updates the UI for easier navigation, and adds developer tooling for filename hygiene, all while maintaining clear release/versioning and documentation.
April 2025
20 Commits • 8 Features
Apr 1, 2025In April 2025, the maths/moodle-qtype_stack repository delivered a set of targeted feature improvements and reliability fixes that strengthen authoring, distribution, and maintenance of STACK questions. The work enhances interactive question authoring, improves download reliability, tightens algebraic logic, updates the UI for easier navigation, and adds developer tooling for filename hygiene, all while maintaining clear release/versioning and documentation.
March 2025
28 Commits • 16 Features
Mar 1, 2025March 2025 monthly summary for maths/moodle-qtype_stack. Delivered a mix of feature enhancements, bug fixes, testing improvements, and documentation/metadata polish across the STACK suite, with a clear focus on release readiness for v4.9.0 and cross‑platform reliability. Key business value includes aligning versioning with planned releases (4.8.4/4.8.5), expanding adapt block capabilities and test coverage, and hardening the codebase through performance optimizations and pre‑release hygiene.
28 Commits • 16 Features
Mar 1, 2025March 2025 monthly summary for maths/moodle-qtype_stack. Delivered a mix of feature enhancements, bug fixes, testing improvements, and documentation/metadata polish across the STACK suite, with a clear focus on release readiness for v4.9.0 and cross‑platform reliability. Key business value includes aligning versioning with planned releases (4.8.4/4.8.5), expanding adapt block capabilities and test coverage, and hardening the codebase through performance optimizations and pre‑release hygiene.
March 2025
February 2025
54 Commits • 16 Features
Feb 1, 2025February 2025 focused on reliability, maintainability, and developer enablement for maths/moodle-qtype_stack. The work targeted core user experience, platform hygiene, and growth-ready documentation and tests. Key outcomes include hardened Parsons input handling, deprecation of direct Windows connections with connector cleanup, expanded Parsons and cross-repo documentation, strengthened Linear Algebra integration (core relocation, autoload, and API context), LaTeX display improvements, and broader test coverage across matrices, hints, and CR workflows. Business value is reflected in fewer user errors, reduced platform maintenance, faster onboarding for contributors, and a more robust foundation for future features.
February 2025
54 Commits • 16 Features
Feb 1, 2025February 2025 focused on reliability, maintainability, and developer enablement for maths/moodle-qtype_stack. The work targeted core user experience, platform hygiene, and growth-ready documentation and tests. Key outcomes include hardened Parsons input handling, deprecation of direct Windows connections with connector cleanup, expanded Parsons and cross-repo documentation, strengthened Linear Algebra integration (core relocation, autoload, and API context), LaTeX display improvements, and broader test coverage across matrices, hints, and CR workflows. Business value is reflected in fewer user errors, reduced platform maintenance, faster onboarding for contributors, and a more robust foundation for future features.
January 2025
57 Commits • 20 Features
Jan 1, 2025January 2025 (2025-01) was a focused release cycle for maths/moodle-qtype_stack. The team delivered documentation and testing enhancements, reinforced input validation and TeX rendering quality, improved admin UI and assessment configuration, and advanced CI, release engineering, and Moodle compatibility to prepare for v4.8.2. These efforts reduce user errors, increase grading reliability, and accelerate onboarding and future updates. Notable outcomes include groundwork for improved error reporting, expanded test coverage, and better alignment with Moodle 4+ and 5.0 environments, while maintaining PHP7 compatibility.
57 Commits • 20 Features
Jan 1, 2025January 2025 (2025-01) was a focused release cycle for maths/moodle-qtype_stack. The team delivered documentation and testing enhancements, reinforced input validation and TeX rendering quality, improved admin UI and assessment configuration, and advanced CI, release engineering, and Moodle compatibility to prepare for v4.8.2. These efforts reduce user errors, increase grading reliability, and accelerate onboarding and future updates. Notable outcomes include groundwork for improved error reporting, expanded test coverage, and better alignment with Moodle 4+ and 5.0 environments, while maintaining PHP7 compatibility.
January 2025
December 2024
24 Commits • 14 Features
Dec 1, 2024December 2024: Focused on stabilizing defaults, expanding DAG capabilities, improving unit handling, and laying groundwork for advanced evaluation. Delivered standardized default inputs, enhanced DAG-based question flow, strengthened unit handling (km) with tests, and initiated non-commutative answer test support and refactor for a rules-based simplifier. Also rolled out QA/docs improvements, added sample questions, UI tweaks, and targeted bug fixes to improve reliability and developer experience.
December 2024
24 Commits • 14 Features
Dec 1, 2024December 2024: Focused on stabilizing defaults, expanding DAG capabilities, improving unit handling, and laying groundwork for advanced evaluation. Delivered standardized default inputs, enhanced DAG-based question flow, strengthened unit handling (km) with tests, and initiated non-commutative answer test support and refactor for a rules-based simplifier. Also rolled out QA/docs improvements, added sample questions, UI tweaks, and targeted bug fixes to improve reliability and developer experience.
November 2024
66 Commits • 24 Features
Nov 1, 2024November 2024 (2024-11) performance for maths/moodle-qtype_stack focused on reliability, UX, and maintainability. The work delivered targeted bug fixes, user-facing enhancements, and extensive documentation and library maintenance, delivering clear business value through improved stability, user experience, and developer productivity. Key outcomes include a correctness fix for a filter edge-case, a visible warning for textarea usage to prevent common editor-related issues, substantial documentation reorganization and updates to improve onboarding and knowledge sharing, and structural cleanup of the STACK library to simplify maintenance. A broad set of testing and bug fixes strengthened correctness across polar forms, matrix handling, MCQ text, and general feedback propagation. Versioning and release artifacts were updated to align with v4.8.x, and tooling improvements (gitsync bulk import) support scalability and faster rollouts. Overall impact: fewer support tickets from common pitfalls, smoother contributor onboarding, and a more maintainable, scalable codebase.
66 Commits • 24 Features
Nov 1, 2024November 2024 (2024-11) performance for maths/moodle-qtype_stack focused on reliability, UX, and maintainability. The work delivered targeted bug fixes, user-facing enhancements, and extensive documentation and library maintenance, delivering clear business value through improved stability, user experience, and developer productivity. Key outcomes include a correctness fix for a filter edge-case, a visible warning for textarea usage to prevent common editor-related issues, substantial documentation reorganization and updates to improve onboarding and knowledge sharing, and structural cleanup of the STACK library to simplify maintenance. A broad set of testing and bug fixes strengthened correctness across polar forms, matrix handling, MCQ text, and general feedback propagation. Versioning and release artifacts were updated to align with v4.8.x, and tooling improvements (gitsync bulk import) support scalability and faster rollouts. Overall impact: fewer support tickets from common pitfalls, smoother contributor onboarding, and a more maintainable, scalable codebase.
November 2024
October 2024
13 Commits • 2 Features
Oct 1, 2024Month: 2024-10 — concise performance-oriented summary for maths/moodle-qtype_stack focusing on delivering core features, stabilizing input handling, and improving developer-facing documentation and organization to boost usability, maintainability, and onboarding.
October 2024
13 Commits • 2 Features
Oct 1, 2024Month: 2024-10 — concise performance-oriented summary for maths/moodle-qtype_stack focusing on delivering core features, stabilizing input handling, and improving developer-facing documentation and organization to boost usability, maintainability, and onboarding.
Activity
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Quality Metrics
Correctness91.4%
Maintainability90.8%
Architecture86.4%
Performance84.4%
AI Usage20.2%
Skills & Technologies
Programming Languages
CSSGherkinHTMLJavaScriptLispMarkdownMaxMax/LispMaximaMaxima Lisp
Technical Skills
API DevelopmentAPI UsageAST ParsingAlgebraic SimplificationAlgorithm ImplementationAlgorithm RefinementAssessment ToolsAutomated TestingBackend DevelopmentBehat TestingBehavior Driven DevelopmentBehavior Driven Development (BDD)Behavior-Driven Development (BDD)Boolean AlgebraBug Fix
Repositories Contributed To
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