hook: fix default usage message for npm hook

lib/hook.js

@@ -9,15 +9,14 @@ const otplease = require('./utils/otplease.js')
 const pudding = require('figgy-pudding')
 const relativeDate = require('tiny-relative-date')
 const Table = require('cli-table3')
-const usage = require('./utils/usage.js')
 const validate = require('aproba')
 
-hook.usage = usage([
+hook.usage = [
   'npm hook add <pkg> <url> <secret> [--type=<type>]',
   'npm hook ls [pkg]',
   'npm hook rm <id>',
   'npm hook update <id> <url> <secret>'
-])
+].join('\n')
 
 hook.completion = (opts, cb) => {
   validate('OF', [opts, cb])
@@ -32,7 +31,14 @@ const HookConfig = pudding({
   unicode: {}
 })
 
-module.exports = (args, cb) => BB.try(() => hook(args)).nodeify(cb)
+function UsageError () {
+  throw Object.assign(new Error(hook.usage), {code: 'EUSAGE'})
+}
+
+module.exports = (args, cb) => BB.try(() => hook(args)).then(
+  val => cb(null, val),
+  err => err.code === 'EUSAGE' ? cb(err.message) : cb(err)
+)
 function hook (args) {
   return otplease(npmConfig(), opts => {
     opts = HookConfig(opts)
@@ -46,6 +52,8 @@ function hook (args) {
       case 'update':
       case 'up':
         return update(args[1], args[2], args[3], opts)
+      default:
+        UsageError()
     }
   })
 }