[HarryCordewener]

Requested by Grave · project thread

A gradient's stops are fixed colours, so SharpMUSH's gradient(..., primary|secondary) is drawn in the game's layout_theme for everyone, while tone() and box borders follow each reader's @theme. This lets a stop say which theme colour it stands for, so the renderer can recolour it per reader.

• ColorGradient.Roles (ImmutableArray<ThemeRole?>, by stop position, empty by default) and ColorGradient.Toned(Func<ThemeRole, IColorMarkup?>).
• LayoutContext.Tones: the reader's colour for each role. Shaded and Gauge shade with Toned gradients. A role the reader gives no colour keeps its written stop.
• Wire: roles stored as ro (role names or null) in the gradient object; omitted when there are none, so existing JSON is unchanged.
• HTML: a stop with a role is written var(--ms-tone-<role>, #hex). A shaded block with roles writes --ms-shade unsampled, because a sampled gradient can't keep the variable.

Added to the unreleased 2.24.0 entry in CHANGELOG.md. A SharpMUSH PR that uses it follows.

Tests: GradientTests covers recolouring after the serializer, the no-theme fallback, and the CSS output. Full suite passes (1381).

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Generated by Claude Code

Summary by CodeRabbit

• New Features
  • Gradient stops can now follow named theme colors, allowing shaded blocks and gauges to adapt to a reader’s theme.
  • Gradients retain their original stop colors when no matching theme color is available, and use those colors as fallbacks in CSS.
  • Theme color assignments are preserved when gradients are saved and loaded.

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Reviewing files that changed from the base of the PR and between 9b0cdd7 and 5d9ba03.

Files selected for processing: 5

• CHANGELOG.md
• MarkupString.Html/Emitters/LayoutHtml.cs
• MarkupString.Html/LayoutCss.cs
• MarkupString.Tests/Layout/GradientTests.cs
• MarkupString/Layout/Blocks/BlockCodec.cs

Walkthrough

Color gradients now support optional theme roles for individual stops. Serialization preserves those roles. Layout tone mappings apply to shaded blocks and gauges, while HTML output retains theme CSS variables and their fallback colors.

Changes

Theme-Aware Gradients

Layer / File(s)	Summary
Gradient roles and serialization MarkupString/ColorGradient.cs, MarkupString/Layout/Blocks/BlockCodec.cs, MarkupString/PublicAPI.Unshipped.txt, CHANGELOG.md	ColorGradient stores optional roles per stop, includes them in equality and hashing, and generates CSS variables with color fallbacks. The block codec reads and writes roles in the ro array.
Tone application and rendering MarkupString/Layout/Blocks/Block.cs, MarkupString/Layout/Blocks/Modifiers.cs, MarkupString/Layout/Blocks/Gauge.cs, MarkupString.Html/Emitters/LayoutHtml.cs, MarkupString.Tests/Layout/GradientTests.cs	LayoutContext applies its optional tone mapping to gradients. Shaded blocks and gauges use toned gradients. HTML preserves role variables, and tests cover themed and unthemed rendering.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant BlockReader
  participant ColorGradient
  participant Shaded
  participant LayoutContext
  participant LayoutHtml
  BlockReader->>ColorGradient: restore roles from ro
  Shaded->>LayoutContext: request toned gradient
  LayoutContext->>ColorGradient: apply Tones mapping
  Shaded->>LayoutHtml: render role-aware gradient CSS

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Suggested reviewers: claude

Merge Risk: Moderate · previous review 9b0cd

Gradients that name theme colours can leave shaded text invisible in browsers that reject the gradient syntax. Round-tripped gradients can also assign theme colours to the wrong stops when a stop cannot be decoded. Fix these two before merging; the formatting loss on toned stops is minor.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title "Let a gradient stop name a theme colour, drawn in the reader's" matches the main change. The PR adds ColorGradient.Roles, which lets each gradient stop name an optional ThemeRole. ColorGrad…
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Title check

Explanation

The title "Let a gradient stop name a theme colour, drawn in the reader's" matches the main change. The PR adds ColorGradient.Roles, which lets each gradient stop name an optional ThemeRole. ColorGradient.Toned and LayoutContext.Tones then draw those stops in the reader's theme colours. The changeset also covers serialization as ro, CSS output with var(--ms-tone-<role>, <colour>), and tests. The title is specific and accurate. It ends with a dangling phrase ("drawn in the reader's"), which leaves the noun "colour" implied and reads slightly awkwardly, but the meaning remains clear.

Full details: Docstring Coverage

Explanation

Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 10 functions across 7 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 3

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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Inline comments:
Review comments at @MarkupString.Html/Emitters/LayoutHtml.cs:
- Line 605: Update the shaded-gradient CSS emission around
`shaded.Gradient.ToCss` to retain a sampled-gradient fallback for role-based
shading, then apply the role-aware gradient only when the browser supports its
interpolation space. Ensure unsupported interpolation leaves the sampled shade
visible rather than transparent.

Review comments at @MarkupString/ColorGradient.cs:
- Line 121: Update the role-resolution expression using Roles, tones, toned, and
stop so a resolved role applies toned’s foreground and terminal fallback without
replacing the original stop’s non-colour formatting, including bold, links, and
background.

Review comments at @MarkupString/Layout/Blocks/BlockCodec.cs:
- Line 389: Update the Gradient decoding path in BlockCodec so roles stay
aligned with successfully decoded stops: when a stop’s markup codec is
unavailable, discard its corresponding role as well, or mark the layout
incomplete rather than retaining a misaligned role.

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Commits

Reviewing files that changed from the base of the PR and between b52993e and 9b0cdd7.

Files selected for processing: 9

• CHANGELOG.md
• MarkupString.Html/Emitters/LayoutHtml.cs
• MarkupString.Tests/Layout/GradientTests.cs
• MarkupString/ColorGradient.cs
• MarkupString/Layout/Blocks/Block.cs
• MarkupString/Layout/Blocks/BlockCodec.cs
• MarkupString/Layout/Blocks/Gauge.cs
• MarkupString/Layout/Blocks/Modifiers.cs
• MarkupString/PublicAPI.Unshipped.txt

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