feat: add skin logo support

ui-tui/src/banner.ts

@@ -2,6 +2,50 @@ import type { ThemeColors } from './theme.js'
 
 type Line = [string, string]
 
+// ── Rich markup parser ──────────────────────────────────────────────
+// Parses Python Rich markup like "[bold #A3261F]text[/]" into Line[].
+const RICH_RE = /\[(?:bold\s+)?(?:dim\s+)?(#(?:[0-9a-fA-F]{3,8}))\]([\s\S]*?)(\[\/\])/g
+
+export function parseRichMarkup(markup: string): Line[] {
+  const lines: Line[] = []
+
+  for (const raw of markup.split('\n')) {
+    const trimmed = raw.trimEnd()
+
+    if (!trimmed) {
+      lines.push(['', ' '])
+
+      continue
+    }
+
+    let lastIndex = 0
+    let matched = false
+    let m: RegExpExecArray | null
+
+    RICH_RE.lastIndex = 0
+
+    while ((m = RICH_RE.exec(trimmed)) !== null) {
+      matched = true
+      const before = trimmed.slice(lastIndex, m.index)
+
+      if (before) {
+        lines.push(['', before])
+      }
+
+      lines.push([m[1]!, m[2]!])
+      lastIndex = m.index + m[0].length
+    }
+
+    if (!matched) {
+      lines.push(['', trimmed])
+    } else if (lastIndex < trimmed.length) {
+      lines.push(['', trimmed.slice(lastIndex)])
+    }
+  }
+
+  return lines
+}
+
 const LOGO_ART = [
   '██╗  ██╗███████╗██████╗ ███╗   ███╗███████╗███████╗       █████╗  ██████╗ ███████╗███╗   ██╗████████╗',
   '██║  ██║██╔════╝██╔══██╗████╗ ████║██╔════╝██╔════╝      ██╔══██╗██╔════╝ ██╔════╝████╗  ██║╚══██╔══╝',
@@ -39,6 +83,22 @@ function colorize(art: string[], gradient: readonly number[], c: ThemeColors): L
 }
 
 export const LOGO_WIDTH = 98
+export const CADUCEUS_WIDTH = 30
 
-export const logo = (c: ThemeColors) => colorize(LOGO_ART, LOGO_GRADIENT, c)
-export const caduceus = (c: ThemeColors) => colorize(CADUCEUS_ART, CADUC_GRADIENT, c)
+export const logo = (c: ThemeColors, customLogo?: string): Line[] =>
+  customLogo ? parseRichMarkup(customLogo) : colorize(LOGO_ART, LOGO_GRADIENT, c)
+
+export const caduceus = (c: ThemeColors, customHero?: string): Line[] =>
+  customHero ? parseRichMarkup(customHero) : colorize(CADUCEUS_ART, CADUC_GRADIENT, c)
+
+export function artWidth(lines: Line[]): number {
+  let max = 0
+
+  for (const [, text] of lines) {
+    if (text.length > max) {
+      max = text.length
+    }
+  }
+
+  return max
+}