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Krzysztof kuhy Rudnicki
17a2c62f26
CLAUDE.md was 1101 lines and loaded into every session in this repo. Three
passes, in order: automate what a gate can check, rewrite what is left as
instructions rather than rationale, extract what still does not fit.
Automated. Five prohibitions were enforced by nothing but a paragraph asking a
future reader not to do something; they are now repo_invariants_test.dart:
- no app/linux/ (a GTK embedder target manages ~20fps at 4K)
- dart:io only in *_io.dart seams and lib/desktop/ -- this one is why the
test exists at all, since dart:io does not fail a web *compile*. It throws
at runtime, so a bad import is a blank white window that the widget tests
happily pass through.
- no meal builder / repeat-last-meal / reward prompt
- no image_picker, no CAMERA permission
- wrapper port 8732 and the diet-guard-desktop Chrome profile, both pinned
because IndexedDB is keyed by origin and moving either hides the whole
local food log
Each guard was canary-tested by breaking the invariant and confirming the
suite goes red -- a guard that cannot fail is decoration.
Rules whose behaviour was already covered (budget epoch seeding, sync merge,
food bank) shrink to a pointer at the test that owns them.
Where a rule's entire value was its rationale ("the removal is the feature"),
the why moved into the name and reason string of the gate that now enforces
it, so it lives somewhere executable instead of somewhere quotable.
Extracted. The vendored flutter/flutter rules were 789 of the 1101 lines --
72% of the file, none of it about this repo. Split into five docs/ topic files
under the cap and linked. Verified content-complete: 664 non-blank lines in,
664 out, zero missing.
Python 692 tests / 100% coverage unchanged; Flutter 548 -> 555 (+7 new).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MK3HCZrM75sRHL1gL8usve
151 lines
5.9 KiB
Markdown
151 lines
5.9 KiB
Markdown
<!--
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Vendored from flutter/flutter docs/rules/rules.md, split across five files
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so each stays under this repo's 250-line cap. Upstream content: edit it here
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only to re-sync with upstream, not to record decisions about this repo --
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those belong in CLAUDE.md.
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-->
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# Colour, type, documentation and accessibility
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_Vendored Flutter/Dart AI rules. See [CLAUDE.md](../CLAUDE.md)._
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### Color Scheme Best Practices
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#### Contrast Ratios
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* **WCAG Guidelines:** Aim to meet the Web Content Accessibility Guidelines
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(WCAG) 2.1 standards.
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* **Minimum Contrast:**
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* **Normal Text:** A contrast ratio of at least **4.5:1**.
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* **Large Text:** (18pt or 14pt bold) A contrast ratio of at least **3:1**.
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#### Palette Selection
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* **Primary, Secondary, and Accent:** Define a clear color hierarchy.
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* **The 60-30-10 Rule:** A classic design rule for creating a balanced color scheme.
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* **60%** Primary/Neutral Color (Dominant)
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* **30%** Secondary Color
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* **10%** Accent Color
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#### Complementary Colors
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* **Use with Caution:** They can be visually jarring if overused.
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* **Best Use Cases:** They are excellent for accent colors to make specific
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elements pop, but generally poor for text and background pairings as they can
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cause eye strain.
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#### Example Palette
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* **Primary:** #0D47A1 (Dark Blue)
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* **Secondary:** #1976D2 (Medium Blue)
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* **Accent:** #FFC107 (Amber)
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* **Neutral/Text:** #212121 (Almost Black)
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* **Background:** #FEFEFE (Almost White)
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### Font Best Practices
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#### Font Selection
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* **Limit Font Families:** Stick to one or two font families for the entire
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application.
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* **Prioritize Legibility:** Choose fonts that are easy to read on screens of
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all sizes. Sans-serif fonts are generally preferred for UI body text.
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* **System Fonts:** Consider using platform-native system fonts.
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* **Google Fonts:** For a wide selection of open-source fonts, use the
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`google_fonts` package.
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#### Hierarchy and Scale
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* **Establish a Scale:** Define a set of font sizes for different text elements
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(e.g., headlines, titles, body text, captions).
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* **Use Font Weight:** Differentiate text effectively using font weights.
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* **Color and Opacity:** Use color and opacity to de-emphasize less important
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text.
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#### Readability
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* **Line Height (Leading):** Set an appropriate line height, typically **1.4x to
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1.6x** the font size.
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* **Line Length:** For body text, aim for a line length of **45-75 characters**.
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* **Avoid All Caps:** Do not use all caps for long-form text.
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#### Example Typographic Scale
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```dart
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// In your ThemeData
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textTheme: const TextTheme(
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displayLarge: TextStyle(fontSize: 57.0, fontWeight: FontWeight.bold),
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titleLarge: TextStyle(fontSize: 22.0, fontWeight: FontWeight.bold),
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bodyLarge: TextStyle(fontSize: 16.0, height: 1.5),
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bodyMedium: TextStyle(fontSize: 14.0, height: 1.4),
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labelSmall: TextStyle(fontSize: 11.0, color: Colors.grey),
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),
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```
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### Documentation
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* **`dartdoc`:** Write `dartdoc`-style comments for all public APIs.
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#### Documentation Philosophy
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* **Comment wisely:** Use comments to explain why the code is written a certain
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way, not what the code does. The code itself should be self-explanatory.
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* **Document for the user:** Write documentation with the reader in mind. If you
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had a question and found the answer, add it to the documentation where you
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first looked. This ensures the documentation answers real-world questions.
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* **No useless documentation:** If the documentation only restates the obvious
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from the code's name, it's not helpful. Good documentation provides context
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and explains what isn't immediately apparent.
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* **Consistency is key:** Use consistent terminology throughout your
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documentation.
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#### Commenting Style
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* **Use `///` for doc comments:** This allows documentation generation tools to
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pick them up.
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* **Start with a single-sentence summary:** The first sentence should be a
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concise, user-centric summary ending with a period.
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* **Separate the summary:** Add a blank line after the first sentence to create
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a separate paragraph. This helps tools create better summaries.
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* **Avoid redundancy:** Don't repeat information that's obvious from the code's
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context, like the class name or signature.
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* **Don't document both getter and setter:** For properties with both, only
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document one. The documentation tool will treat them as a single field.
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#### Writing Style
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* **Be brief:** Write concisely.
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* **Avoid jargon and acronyms:** Don't use abbreviations unless they are widely
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understood.
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* **Use Markdown sparingly:** Avoid excessive markdown and never use HTML for
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formatting.
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* **Use backticks for code:** Enclose code blocks in backtick fences, and
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specify the language.
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#### What to Document
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* **Public APIs are a priority:** Always document public APIs.
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* **Consider private APIs:** It's a good idea to document private APIs as well.
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* **Library-level comments are helpful:** Consider adding a doc comment at the
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library level to provide a general overview.
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* **Include code samples:** Where appropriate, add code samples to illustrate usage.
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* **Explain parameters, return values, and exceptions:** Use prose to describe
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what a function expects, what it returns, and what errors it might throw.
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* **Place doc comments before annotations:** Documentation should come before
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any metadata annotations.
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### Accessibility (A11Y)
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Implement accessibility features to empower all users, assuming a wide variety
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of users with different physical abilities, mental abilities, age groups,
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education levels, and learning styles.
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* **Color Contrast:** Ensure text has a contrast ratio of at least **4.5:1**
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against its background.
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* **Dynamic Text Scaling:** Test your UI to ensure it remains usable when users
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increase the system font size.
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* **Semantic Labels:** Use the `Semantics` widget to provide clear, descriptive
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labels for UI elements.
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* **Screen Reader Testing:** Regularly test your app with TalkBack (Android) and
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VoiceOver (iOS).
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