Add ANSI color code to HTML conversion for log display

Terminal color codes were rendering as raw escape sequences in the
web UI, making logs hard to read.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/client/ansi.ts

@@ -0,0 +1,62 @@
+const COLORS: Record<number, string> = {
+  30: '#666',     // black (brightened for dark bg)
+  31: '#f87171',  // red
+  32: '#4ade80',  // green
+  33: '#facc15',  // yellow
+  34: '#60a5fa',  // blue
+  35: '#c084fc',  // magenta
+  36: '#22d3ee',  // cyan
+  37: '#e5e5e5',  // white
+  90: '#999',     // bright black
+  91: '#fca5a5',  // bright red
+  92: '#86efac',  // bright green
+  93: '#fde047',  // bright yellow
+  94: '#93c5fd',  // bright blue
+  95: '#d8b4fe',  // bright magenta
+  96: '#67e8f9',  // bright cyan
+  97: '#fff',     // bright white
+}
+
+const ESC = /\x1b\[([0-9;]*)m/g
+
+const escape = (s: string) =>
+  s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+
+export function ansiToHtml(text: string): string {
+  if (!text.includes('\x1b')) return escape(text)
+
+  let result = ''
+  let last = 0
+  let open = false
+  let match: RegExpExecArray | null
+
+  while ((match = ESC.exec(text)) !== null) {
+    result += escape(text.slice(last, match.index))
+    last = match.index + match[0].length
+
+    const codes = match[1] ? match[1].split(';').map(Number) : [0]
+
+    for (const code of codes) {
+      if (code === 0 || code === 39) {
+        if (open) { result += '</span>'; open = false }
+      } else if (COLORS[code]) {
+        if (open) result += '</span>'
+        result += `<span style="color:${COLORS[code]}">`
+        open = true
+      } else if (code === 1) {
+        if (open) result += '</span>'
+        result += '<span style="font-weight:bold">'
+        open = true
+      } else if (code === 2) {
+        if (open) result += '</span>'
+        result += '<span style="opacity:0.7">'
+        open = true
+      }
+    }
+  }
+
+  result += escape(text.slice(last))
+  if (open) result += '</span>'
+
+  return result
+}

src/client/components/LogsSection.tsx

@@ -1,5 +1,6 @@
 import { define } from '@because/forge'
 import type { App, LogLine as LogLineType } from '../../shared/types'
+import { ansiToHtml } from '../ansi'
 import { getLogDates, getLogsForDate } from '../api'
 import { isNarrow } from '../state'
 import { LogLine, LogsContainer, LogsHeader, LogTime, Section, SectionTitle } from '../styles'
@@ -107,7 +108,7 @@ function LogsContent() {
           filteredLiveLogs.map((line, i) => (
             <LogLine key={i}>
               <LogTime>{new Date(line.time).toLocaleTimeString()}</LogTime>
-              <span>{line.text}</span>
+              <span dangerouslySetInnerHTML={{ __html: ansiToHtml(line.text) }} />
             </LogLine>
           ))
         ) : (
@@ -126,7 +127,7 @@ function LogsContent() {
               <span style={{ color: theme('colors-textFaintest'), marginRight: 12 }}>
                 {line.match(/^\[([^\]]+)\]/)?.[1]?.split('T')[1]?.slice(0, 8) ?? '--:--:--'}
               </span>
-              <span>{line.replace(/^\[[^\]]+\] \[[^\]]+\] /, '')}</span>
+              <span dangerouslySetInnerHTML={{ __html: ansiToHtml(line.replace(/^\[[^\]]+\] \[[^\]]+\] /, '')) }} />
             </LogLine>
           ))
         ) : (

src/client/components/UnifiedLogs.tsx

@@ -1,3 +1,4 @@
+import { ansiToHtml } from '../ansi'
 import { isNarrow } from '../state'
 import {
   LogApp,
@@ -65,9 +66,10 @@ function LogLineEntry({ log }: { log: UnifiedLogLine }) {
     <LogEntry narrow={narrow}>
       <LogTimestamp narrow={narrow}>{formatTime(log.time)}</LogTimestamp>
       <LogApp narrow={narrow}>{log.app}</LogApp>
-      <LogText style={statusColor ? { color: statusColor } : undefined}>
+      <LogText
-        {log.text}
+        style={statusColor ? { color: statusColor } : undefined}
-      </LogText>
+        dangerouslySetInnerHTML={{ __html: ansiToHtml(log.text) }}
+      />
     </LogEntry>
   )
 }