Split workspace into electron and ui packages

packages/ui/src/lib/diff-utils.ts

@@ -0,0 +1,50 @@
+const HUNK_PATTERN = /(^|\n)@@/m
+const FILE_MARKER_PATTERN = /(^|\n)(diff --git |--- |\+\+\+)/
+const BEGIN_PATCH_PATTERN = /^\*\*\* (Begin|End) Patch/
+const UPDATE_FILE_PATTERN = /^\*\*\* Update File: (.+)$/
+
+function stripCodeFence(value: string): string {
+  const trimmed = value.trim()
+  if (!trimmed.startsWith("```")) return trimmed
+  const lines = trimmed.split("\n")
+  if (lines.length < 2) return ""
+  const lastLine = lines[lines.length - 1]
+  if (!lastLine.startsWith("```")) return trimmed
+  return lines.slice(1, -1).join("\n")
+}
+
+export function normalizeDiffText(raw: string): string {
+  if (!raw) return ""
+  const withoutFence = stripCodeFence(raw.replace(/\r\n/g, "\n"))
+  const lines = withoutFence.split("\n").map((line) => line.replace(/\s+$/u, ""))
+
+  let pendingFilePath: string | null = null
+  const cleanedLines: string[] = []
+
+  for (const line of lines) {
+    if (!line) continue
+    if (BEGIN_PATCH_PATTERN.test(line)) {
+      continue
+    }
+    const updateMatch = line.match(UPDATE_FILE_PATTERN)
+    if (updateMatch) {
+      pendingFilePath = updateMatch[1]?.trim() || null
+      continue
+    }
+    cleanedLines.push(line)
+  }
+
+  if (pendingFilePath && !FILE_MARKER_PATTERN.test(cleanedLines.join("\n"))) {
+    cleanedLines.unshift(`+++ b/${pendingFilePath}`)
+    cleanedLines.unshift(`--- a/${pendingFilePath}`)
+  }
+
+  return cleanedLines.join("\n").trim()
+}
+
+export function isRenderableDiffText(raw?: string | null): raw is string {
+  if (!raw) return false
+  const normalized = normalizeDiffText(raw)
+  if (!normalized) return false
+  return HUNK_PATTERN.test(normalized)
+}