code cleanup

src/fsutil.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+
+// Returns a non-existing path in `base` named `name` (or `name (2)`, `name (3)`...).
+function dedupeDir(base, name) {
+  const candidate = path.join(base, name)
+  if (!fs.existsSync(candidate)) return candidate
+  let n = 2
+  while (fs.existsSync(path.join(base, `${name} (${n})`))) n++
+  return path.join(base, `${name} (${n})`)
+}
+
+module.exports = { dedupeDir }