Refactor DocUtils Phase 4: Developer documentation for template system

[ocots]

⚪ Phase 4: Developer Documentation for Template System

This issue covers the creation of a comprehensive developer guide for the DocUtils template and extension system. It aims to make it easier for contributors to create new documentation pages and add custom visualizations.

This is part of the global DocUtils refactoring effort (Epic #130).

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🎯 Objectives

• Document the Template System: Explain how .template files work and how they are processed.
• Reference Guide: Document all available blocks (INCLUDE_ENVIRONMENT, PROFILE_PLOT, PROFILE_ANALYSIS, INCLUDE_FIGURE, INCLUDE_TEXT) and their parameters.
• Extension Guide: Provide a step-by-step tutorial on how to add a new visualization or analysis tool via the Registry system.

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🛠️ Planned Changes

1. New Documentation Page:
   • Create docs/src/developers/docutils_templates.md.
2. Content Sections:
   • Architecture Overview: Core vs Handlers.
   • Template Block Syntax: Full reference of blocks and parameters.
   • How-To: Add a new Handler: Implementing and registering a new function.
   • Debugging: Usage of set_doc_debug!.
3. Docstrings Update:
   • Ensure all core and handler functions have clear, well-formatted docstrings.

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🔗 Part of Epic Branch

Work will be performed on branch feat/docutils-P4-dev-docs and merged into refactor/docutils-infra via PR.

[ocots]

Issue #135 - Refactor DocUtils Phase 4: Developer documentation for template system

Date: 2026-01-09 | State: OPEN | Repo: control-toolbox/CTBenchmarks.jl
PR: #138 on branch feat/docutils-P4-dev-docs

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📋 Summary

Phase 4 focuses on creating comprehensive developer documentation for the DocUtils template and extension system. The goal is to enable contributors to easily create new documentation pages and add custom visualizations through clear guides and references.

Created: 2026-01-09 | Updated: 2026-01-09 | Labels: None

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💬 Discussion

Issue Description: This phase is part of the global DocUtils refactoring effort (Epic #130). It aims to document the template system architecture, provide a complete reference for template blocks, and create a step-by-step extension guide.

Key Objectives:

1. Document how .template files work and are processed
2. Create a reference guide for all template blocks
3. Provide an extension tutorial for adding new handlers

No comments yet - Issue just created.

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✅ Completed

• ✓ Branch created and synced - feat/docutils-P4-dev-docs merged with latest refactor/docutils-infra (commit df8923e4)
• ✓ PR opened - PR Refactor DocUtils Phase 4: Developer documentation for template system #138 created and linked to issue
• ✓ Phase 3 completed - All architectural improvements from Phase 3 are now in the base branch:
  • Wrapper functions eliminated
  • Adapter functions removed
  • 100% generic Engines (DIP-compliant)

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📝 Pending Actions

🔴 Critical (blocking merge)

Create developer documentation page

• Why: Main deliverable for Phase 4
• Where: docs/src/developers/docutils_templates.md (new file)
• Complexity: Moderate
• Details: Comprehensive guide covering:
  • Architecture overview (Core vs Handlers)
  • Template block syntax reference
  • Extension tutorial (how to add a new handler)
  • Debugging guide (set_doc_debug!)

Update docs/make.jl to include new page

• Why: Make documentation accessible
• Where: docs/make.jl
• Complexity: Simple
• Details: Add "Developer Guide" => "developers/docutils_templates.md" to pages list

🟡 High (should do before merge)

Review and improve docstrings

• Why: Ensure all functions have clear, well-formatted docstrings
• Where: docs/src/docutils/Core/*.jl and docs/src/docutils/Handlers/*.jl
• Complexity: Moderate
• Details: Verify docstrings follow Julia conventions:
  • Clear one-line summary
  • Detailed description
  • Arguments section with types
  • Returns section
  • Examples where appropriate

Add code examples to documentation

• Why: Make extension guide practical and actionable
• Where: New developer documentation page
• Complexity: Moderate
• Details: Include working examples of:
  • Creating a new figure handler
  • Creating a new text handler
  • Registering handlers
  • Using handlers in templates

🟢 Medium (nice to have)

Create architecture diagram

• Why: Visual aid for understanding system structure
• Where: docs/src/assets/ (SVG/PNG)
• Complexity: Simple
• Details: Diagram showing:
  • Core modules (Engines)
  • Handler modules
  • Registry system
  • Template processing flow

Add troubleshooting section

• Why: Help developers debug common issues
• Where: Developer documentation page
• Complexity: Simple
• Details: Common errors and solutions:
  • Handler not found in registry
  • Template parsing errors
  • Figure generation failures

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🔧 Technical Analysis

Current State:

• ✅ Architecture: Clean separation (Core/Handlers) established in Phase 1
• ✅ Registry System: Dynamic registration implemented in Phase 2
• ✅ Generic Engines: 100% generic, no handler-specific logic (Phase 3)
• ❌ Documentation: No developer guide exists yet

Code Findings:

• docs/src/docutils/Core/: Contains 7 well-structured engine modules
  • TextEngine.jl: 57 lines, fully generic
  • FigureEngine.jl: 176 lines, fully generic
  • TemplateEngine.jl: 987 lines, orchestrates all processing
  • ProfileEngine.jl: 88 lines, registry-based wrappers
  • TemplateGenerator.jl: 576 lines, auto-generates problem pages
  • Common.jl, DocumenterReference.jl: Utilities
• docs/src/docutils/Handlers/: Contains 5 handler modules
  • DefaultProfiles.jl: Profile configurations
  • PlotTimeVsGridSize.jl: 265 lines, 2 plotting functions
  • PlotIterationsVsCpuTime.jl: 137 lines, 1 plotting function
  • PrintBenchmarkResults.jl: 410 lines, table generation
  • PrintEnvConfig.jl: 242 lines, 6 environment display functions
  • PrintLogResults.jl: 140 lines, log formatting

Docstring Coverage:

• ✅ Most functions have docstrings
• ⚠️ Some docstrings could be more detailed (e.g., examples)
• ✅ Consistent format across modules

Julia Standards:

• ✅ Structure: Excellent modular organization
• ✅ Type Annotations: Present in function signatures
• ✅ Exports: Clean export lists in CTBenchmarksDocUtils.jl
• ✅ Registration Pattern: Well-implemented registry system
• ⚠️ Documentation: Missing developer guide (this issue's goal)

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🚧 Blockers

None currently. All dependencies from previous phases are resolved.

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💡 Recommendations

Immediate:

1. Create docs/src/developers/ directory and start with the main guide
2. Use existing docstrings as foundation - they're already well-written
3. Include real examples from existing handlers - PlotTimeVsGridSize.jl is a good reference
4. Test documentation build after adding new page

Content Structure Suggestion:

# DocUtils Developer Guide

## Architecture Overview
- Core vs Handlers separation
- Registry pattern
- Template processing flow

## Template Block Reference
### INCLUDE_ENVIRONMENT
### INCLUDE_FIGURE
### INCLUDE_TEXT
### PROFILE_PLOT
### PROFILE_ANALYSIS

## Extension Tutorial
### Creating a Figure Handler
### Creating a Text Handler
### Registration
### Using in Templates

## Debugging
### set_doc_debug!
### Common Issues

Long-term:

• Consider adding a "Contributing to DocUtils" section in main README
• Create a video walkthrough for complex extensions
• Add integration tests for template processing

Julia Alignment:

• ✅ Already follows Julia best practices
• Consider adding @doc macro for module-level documentation
• Ensure examples in docs are tested (use @example blocks)

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Status: Ready to start implementation
Effort: Medium (2-4 hours for comprehensive guide)

[ocots]

✅ Issue #135 - RESOLVED

Phase 4 is complete. All objectives have been achieved.

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📋 Summary

Created comprehensive developer documentation for the DocUtils template and extension system as specified in this issue.

PR: #138
Commit: 804189c1

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✅ Completed Objectives

1. Document the Template System ✓

• Explained how .template files work
• Documented template processing flow
• Included ASCII art diagram of complete pipeline

2. Reference Guide ✓

Complete documentation of all template blocks:

• INCLUDE_ENVIRONMENT - Environment configuration
• INCLUDE_FIGURE - Custom figures
• INCLUDE_TEXT - Custom text
• PROFILE_PLOT - Performance profile plots
• PROFILE_ANALYSIS - Performance profile analysis

Each block includes:

• Syntax examples
• Parameter descriptions
• Output format
• Usage examples

3. Extension Guide ✓

Step-by-step tutorial with complete, working code examples:

• Creating a figure handler (PlotObjectiveConvergence example)
• Creating a text handler (PrintSolverComparison example)
• Handler signature requirements
• Registration pattern
• Template usage

4. Additional Content

• Architecture Overview: Core vs Handlers separation
• Debugging Guide: set_doc_debug!() usage
• Troubleshooting: Common issues and solutions
• Best Practices: Handler design, template organization, performance
• Quick Reference: Tables and appendix

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📄 Deliverable

File: docs/src/developers/docutils_templates.md (639 lines)

Sections:

1. Introduction
2. Architecture (Core modules, Handler modules, Processing flow)
3. Template Block Reference (5 blocks, complete syntax)
4. Extension Tutorial (Figure handlers, Text handlers)
5. Debugging
6. Best Practices
7. Appendix: Quick Reference

Integration: Added to docs/make.jl in "Developers Guidelines" section

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🎯 Impact

This documentation enables contributors to:

• Understand the template system architecture
• Create new documentation pages using templates
• Extend the system with custom visualizations
• Debug template processing issues
• Follow best practices for handler development

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Status: ✅ RESOLVED

All planned changes from this issue have been implemented and are ready for merge via PR #138.