feat: add --preserve-root (default) option

bin.js

@@ -2,9 +2,22 @@
 
 const rimraf = require('./')
 
+const path = require('path')
+
+const isRoot = arg => /^(\/|[a-zA-Z]:\\)$/.test(path.resolve(arg))
+const filterOutRoot = arg => {
+  const ok = preserveRoot === false || !isRoot(arg)
+  if (!ok) {
+    console.error(`refusing to remove ${arg}`)
+    console.error('Set --no-preserve-root to allow this')
+  }
+  return ok
+}
+
 let help = false
 let dashdash = false
 let noglob = false
+let preserveRoot = true
 const args = process.argv.slice(2).filter(arg => {
   if (dashdash)
     return !!arg
@@ -16,9 +29,13 @@ const args = process.argv.slice(2).filter(arg => {
     noglob = false
   else if (arg.match(/^(-+|\/)(h(elp)?|\?)$/))
     help = true
+  else if (arg === '--preserve-root')
+    preserveRoot = true
+  else if (arg === '--no-preserve-root')
+    preserveRoot = false
   else
     return !!arg
-})
+}).filter(arg => !preserveRoot || filterOutRoot(arg))
 
 const go = n => {
   if (n >= args.length)
@@ -40,9 +57,12 @@ if (help || args.length === 0) {
   log('')
   log('Options:')
   log('')
-  log('  -h, --help     Display this usage info')
-  log('  -G, --no-glob  Do not expand glob patterns in arguments')
-  log('  -g, --glob     Expand glob patterns in arguments (default)')
+  log('  -h, --help          Display this usage info')
+  log('  -G, --no-glob       Do not expand glob patterns in arguments')
+  log('  -g, --glob          Expand glob patterns in arguments (default)')
+  log('  --preserve-root     Do not remove \'/\' (default)')
+  log('  --no-preserve-root  Do not treat \'/\' specially')
+  log('  --                  Stop parsing flags')
   process.exit(help ? 0 : 1)
 } else
   go(0)