Add ANSI rendering for bash tool output

packages/ui/src/lib/ansi.ts

@@ -0,0 +1,36 @@
+import AnsiToHtml from "ansi-to-html"
+
+const ESC_CHAR = "\u001b"
+const ANSI_LITERAL_PATTERN = /\\u001b|\\x1b|\\033/
+const ANSI_SGR_PATTERN = /\u001b\[[0-9;]*m/
+const ANSI_NON_SGR_PATTERN = /\u001b\[[0-9;?]*[A-Za-ln-zA-LN-Z]/g
+
+const ansiConverter = new AnsiToHtml({
+  escapeXML: true,
+})
+
+export function hasAnsi(text: string): boolean {
+  const normalized = normalizeAnsiText(text)
+  return ANSI_SGR_PATTERN.test(normalized)
+}
+
+export function ansiToHtml(text: string): string {
+  const normalized = normalizeAnsiText(text)
+  const sanitized = stripNonSgrAnsi(normalized)
+  return ansiConverter.toHtml(sanitized)
+}
+
+function normalizeAnsiText(text: string): string {
+  if (!ANSI_LITERAL_PATTERN.test(text)) {
+    return text
+  }
+
+  return text
+    .replace(/\\u001b/gi, ESC_CHAR)
+    .replace(/\\x1b/gi, ESC_CHAR)
+    .replace(/\\033/g, ESC_CHAR)
+}
+
+function stripNonSgrAnsi(text: string): string {
+  return text.replace(ANSI_NON_SGR_PATTERN, "")
+}