refactor(packages): extract ast-grep-core from ast-grep-mcp

packages/ast-grep-core/src/result-formatter.ts

@@ -0,0 +1,70 @@
+import type { SgResult } from "./types"
+
+export function formatSearchResult(result: SgResult): string {
+  if (result.error) {
+    return `Error: ${result.error}`
+  }
+
+  if (result.matches.length === 0) {
+    return "No matches found"
+  }
+
+  const lines: string[] = []
+
+  if (result.truncated) {
+    const reason = result.truncatedReason === "max_matches"
+      ? `showing first ${result.matches.length} of ${result.totalMatches}`
+      : result.truncatedReason === "max_output_bytes"
+      ? "output exceeded 1MB limit"
+      : "search timed out"
+    lines.push(`[TRUNCATED] Results truncated (${reason})\n`)
+  }
+
+  lines.push(`Found ${result.matches.length} match(es)${result.truncated ? ` (truncated from ${result.totalMatches})` : ""}:\n`)
+
+  for (const match of result.matches) {
+    const loc = `${match.file}:${match.range.start.line + 1}:${match.range.start.column + 1}`
+    lines.push(`${loc}`)
+    lines.push(`  ${match.lines.trim()}`)
+    lines.push("")
+  }
+
+  return lines.join("\n")
+}
+
+export function formatReplaceResult(result: SgResult, isDryRun: boolean): string {
+  if (result.error) {
+    return `Error: ${result.error}`
+  }
+
+  if (result.matches.length === 0) {
+    return "No matches found to replace"
+  }
+
+  const prefix = isDryRun ? "[DRY RUN] " : ""
+  const lines: string[] = []
+
+  if (result.truncated) {
+    const reason = result.truncatedReason === "max_matches"
+      ? `showing first ${result.matches.length} of ${result.totalMatches}`
+      : result.truncatedReason === "max_output_bytes"
+      ? "output exceeded 1MB limit"
+      : "search timed out"
+    lines.push(`[TRUNCATED] Results truncated (${reason})\n`)
+  }
+
+  lines.push(`${prefix}${result.matches.length} replacement(s):\n`)
+
+  for (const match of result.matches) {
+    const loc = `${match.file}:${match.range.start.line + 1}:${match.range.start.column + 1}`
+    lines.push(`${loc}`)
+    lines.push(`  ${match.text}`)
+    lines.push("")
+  }
+
+  if (isDryRun) {
+    lines.push("Use dryRun=false to apply changes")
+  }
+
+  return lines.join("\n")
+}