refactor(tools): rename safe-grep to grep with override capability

src/tools/grep/constants.ts

@@ -0,0 +1,99 @@
+import { existsSync } from "node:fs"
+import { join, dirname } from "node:path"
+import { spawnSync } from "node:child_process"
+
+export type GrepBackend = "rg" | "grep"
+
+interface ResolvedCli {
+  path: string
+  backend: GrepBackend
+}
+
+let cachedCli: ResolvedCli | null = null
+
+function findExecutable(name: string): string | null {
+  const isWindows = process.platform === "win32"
+  const cmd = isWindows ? "where" : "which"
+
+  try {
+    const result = spawnSync(cmd, [name], { encoding: "utf-8", timeout: 5000 })
+    if (result.status === 0 && result.stdout.trim()) {
+      return result.stdout.trim().split("\n")[0]
+    }
+  } catch {
+    // ignore
+  }
+  return null
+}
+
+function getOpenCodeBundledRg(): string | null {
+  // OpenCode binary directory (where opencode executable lives)
+  const execPath = process.execPath
+  const execDir = dirname(execPath)
+
+  const isWindows = process.platform === "win32"
+  const rgName = isWindows ? "rg.exe" : "rg"
+
+  // Check common bundled locations
+  const candidates = [
+    join(execDir, rgName),
+    join(execDir, "bin", rgName),
+    join(execDir, "..", "bin", rgName),
+    join(execDir, "..", "libexec", rgName),
+  ]
+
+  for (const candidate of candidates) {
+    if (existsSync(candidate)) {
+      return candidate
+    }
+  }
+
+  return null
+}
+
+export function resolveGrepCli(): ResolvedCli {
+  if (cachedCli) return cachedCli
+
+  // Priority 1: OpenCode bundled rg
+  const bundledRg = getOpenCodeBundledRg()
+  if (bundledRg) {
+    cachedCli = { path: bundledRg, backend: "rg" }
+    return cachedCli
+  }
+
+  // Priority 2: System rg
+  const systemRg = findExecutable("rg")
+  if (systemRg) {
+    cachedCli = { path: systemRg, backend: "rg" }
+    return cachedCli
+  }
+
+  // Priority 3: grep (fallback)
+  const grep = findExecutable("grep")
+  if (grep) {
+    cachedCli = { path: grep, backend: "grep" }
+    return cachedCli
+  }
+
+  // Last resort: assume rg is in PATH
+  cachedCli = { path: "rg", backend: "rg" }
+  return cachedCli
+}
+
+export const DEFAULT_MAX_DEPTH = 20
+export const DEFAULT_MAX_FILESIZE = "10M"
+export const DEFAULT_MAX_COUNT = 500
+export const DEFAULT_MAX_COLUMNS = 1000
+export const DEFAULT_CONTEXT = 2
+export const DEFAULT_TIMEOUT_MS = 300_000
+export const DEFAULT_MAX_OUTPUT_BYTES = 10 * 1024 * 1024
+
+export const RG_SAFETY_FLAGS = [
+  "--no-follow",
+  "--color=never",
+  "--no-heading",
+  "--line-number",
+  "--with-filename",
+] as const
+
+export const GREP_SAFETY_FLAGS = ["-n", "-H", "--color=never"] as const