القائمة
Guide for writing new pattern pages in the pony-patterns documentation. Load when adding a new pattern or a new pattern category.
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| name | write-pattern |
| description | Guide for writing new pattern pages in the pony-patterns documentation. Load when adding a new pattern or a new pattern category. |
| disable-model-invocation | false |
Follow these conventions when adding new patterns to the pony-patterns documentation.
Write casually, like you're explaining something to a friend. Be direct and concrete. Avoid being mechanical or listy ("it provides X, Y, and Z"). When something might seem magical or foreign to the reader, take a moment to explain where it comes from and what it does. Don't assume readers already know the standard library or advanced type system features.
Avoid excessive em dashes. Use periods, colons, semicolons, commas, and parentheses for variety.
Every pattern page starts with this front matter:
---
hide:
- toc
---
The page structure is always:
# Pattern Name (H1)## Problem (H2)## Solution (H2)## Discussion (H2)No other H2 headings. Favor flowing narrative prose in Discussion over H3 subsections. If the discussion is long enough that distinct topics genuinely need signposting, subsections are acceptable, but the default should be connected prose with transitions between ideas.
Mermaid diagrams are supported via the pymdownx.superfences custom fence. Both graph and sequenceDiagram types work. In sequence diagrams, participant names must be single letters (participant A as EchoServer). Multi-character participant names silently break rendering. The simplest approach is to skip participant declarations entirely and use names directly in the arrows.
Start from the user's concrete need, not an abstract statement about software engineering. Frame it as something they're trying to do: "Your system needs X", "You want to enforce Y", "You have a value that could be one of several things".
Show a code example of the naive or problematic approach. After the code, explain why it falls short. Connect the prose to the code by naming specific functions or types from the example so the reader can follow along.
Open with what the solution gives you. Talk about the guarantees and benefits before diving into the mechanics. The reader should understand why this approach is better before they see how it works.
Build up incrementally. Don't dump a wall of code and expect the reader to figure it out. Introduce one concept at a time with a small code snippet, then explain what's going on in it. Walk through the moving parts. If something could look magical ("where did MakeConstrained come from?"), explain it.
After walking through all the pieces, show a complete runnable program that ties everything together. This is the reference the reader can copy and adapt.
Favor flowing narrative over a list of bullet points under separate headings. Connect your points with transitions so the discussion reads as a coherent piece rather than a FAQ. Cover things like:
When linking to related patterns, make sure the cross-references go both ways. If the new pattern references an existing one, update the existing pattern to reference the new one too.
Create the markdown file in the appropriate category directory under docs/. If no existing category fits, create a new one (see below).
If the pattern belongs in a new category, create a docs/<category>/index.md with the same front matter (hide: toc), an H1 like "Category Name Patterns", and a brief paragraph describing what the category covers. Also add an entry for the new category in docs/index.md under the "What's here" section, following the same format as the existing entries (bold linked name, then a sentence or two explaining what the category addresses). Keep the entries in alphabetical order.
Add the pattern to the nav section in mkdocs.yml. Categories are listed alphabetically. Each category has an Overview entry pointing to its index page, followed by its patterns.
- Category Name Patterns:
- Overview: 'category-name/index.md'
- Pattern Name: 'category-name/pattern-name.md'
Also update the llmstxt sections block in mkdocs.yml to include the new category. Keep the sections in alphabetical order. If adding a pattern to an existing category that's already listed, no change is needed.
When the new pattern relates to existing patterns, add links in both directions. The new pattern should link to the related ones in its Discussion, and the related patterns should be updated to mention the new one.
The cspell config (cspell.json) excludes fenced code blocks and inline code from spell checking, so Pony identifiers in code won't be flagged. If your prose uses unusual words, check .cspell/project-words.txt and .cspell/pony-terms.txt. Add words only if they're genuinely needed and not already covered.
After writing:
npx is not available, use Docker: docker run --rm -v "$(pwd):/workdir" -w /workdir ghcr.io/streetsidesoftware/cspell:latest "docs/<category>/*.md" plus any modified files.mkdocs build --strict to verify the site builds without broken links. If mkdocs is not installed, create a venv: python3 -m venv .venv && .venv/bin/pip install mkdocs mkdocs-material mkdocs-htmlproofer-plugin then use .venv/bin/mkdocs build --strict. The .venv directory is already in .gitignore.