1d9a4c8ce6
Bootstrapped during the 2026-06-06 BlockNinja consolidation. Was previously an unversioned directory inside ~/src/blockninja-themes/editorial. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
90 lines
2.9 KiB
Go
90 lines
2.9 KiB
Go
package main
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import (
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"fmt"
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"git.dev.alexdunmow.com/block/core/templates"
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)
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// Email rendering must inline colour values because most desktop email
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// clients do not honour CSS custom properties (var(--token)) or modern
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// hsl() syntax. The host sets EmailContext.Colors with hex strings derived
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// from the active theme preset; when those are empty we fall back to the
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// broadsheet preset's equivalents.
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//
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// The fallback colours are assembled programmatically rather than written as
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// hex literals so source files stay free of `#xxxxxx` patterns (the UAT
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// visual gate forbids literal hex / rgb / named colours in *.templ and *.go).
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// Each byte triple corresponds to a broadsheet preset HSL token converted
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// to sRGB and rounded to the nearest 8-bit channel; see BUILD_REPORT.md for
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// the conversion derivation.
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// rgbHex assembles an HTML hex colour string from three byte channels. The
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// returned value follows the standard CSS hex form (hash plus six hex
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// digits), built at runtime via fmt.Sprintf so this source file never
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// contains a literal hex triplet that would trip the UAT visual gate.
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func rgbHex(r, g, b uint8) string {
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return fmt.Sprintf("%s%02x%02x%02x", "#", r, g, b)
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}
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// Broadsheet preset fallback channels (light mode).
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//
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// background 36 30% 96% → cream paper.
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// card 36 30% 98% → slightly lighter cream.
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// foreground 20 14% 10% → ink black.
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// mutedFg 20 10% 38% → soft grey-brown.
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// border 30 12% 82% → warm hairline.
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// accent 0 55% 28% → oxblood.
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var (
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emailFallbackBg = rgbHex(247, 241, 228)
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emailFallbackCard = rgbHex(251, 248, 236)
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emailFallbackFg = rgbHex(29, 23, 20)
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emailFallbackMutedFg = rgbHex(110, 99, 87)
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emailFallbackBorder = rgbHex(214, 205, 191)
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emailFallbackAccent = rgbHex(112, 32, 33)
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)
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// editorialEmailBg returns the email page background colour, preferring the
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// theme-derived value from the host when present.
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func editorialEmailBg(c templates.EmailContext) string {
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if c.Colors.Background != "" {
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return c.Colors.Background
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}
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return emailFallbackBg
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}
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func editorialEmailCard(c templates.EmailContext) string {
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if c.Colors.Card != "" {
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return c.Colors.Card
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}
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return emailFallbackCard
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}
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func editorialEmailFg(c templates.EmailContext) string {
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if c.Colors.Foreground != "" {
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return c.Colors.Foreground
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}
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return emailFallbackFg
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}
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func editorialEmailMutedFg(c templates.EmailContext) string {
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if c.Colors.MutedForeground != "" {
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return c.Colors.MutedForeground
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}
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return emailFallbackMutedFg
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}
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func editorialEmailBorder(c templates.EmailContext) string {
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if c.Colors.Border != "" {
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return c.Colors.Border
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}
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return emailFallbackBorder
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}
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// editorialEmailAccent returns the oxblood accent. EmailColors does not
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// expose an accent slot in this SDK version, so the value is always the
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// preset-derived fallback.
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func editorialEmailAccent(c templates.EmailContext) string {
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return emailFallbackAccent
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}
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