fix(registry): be better at using the correct registry (relevant for npme)

Closes #53

src/index.js

@@ -1,5 +1,6 @@
 const { readFileSync, writeFileSync } = require('fs')
 const path = require('path')
+const url = require('url')
 
 const _ = require('lodash')
 const log = require('npmlog')
@@ -45,11 +46,12 @@ npmconf.load({}, (err, conf) => {
       token: env.NPM_TOKEN
     },
     loglevel: conf.get('loglevel'),
-    registry: conf.get('registry'),
+    registry: require('./lib/get-registry')(pkg, conf),
     tag: (pkg.publishConfig || {}).tag || conf.get('tag') || 'latest'
   }
 
-  if (npm.registry[npm.registry.length - 1] !== '/') npm.registry += '/'
+  // normalize trailing slash
+  npm.registry = url.format(url.parse(npm.registry))
 
   log.level = npm.loglevel
 

src/lib/get-registry.js

@@ -0,0 +1,12 @@
+module.exports = function (pkg, conf) {
+  if (pkg.publishConfig && pkg.publishConfig.registry) return pkg.publishConfig.registry
+
+  if (pkg.name[0] !== '@') return conf.get('registry') || 'https://registry.npmjs.org/'
+
+  const scope = pkg.name.split('/')[0]
+  const scopedRegistry = conf.get(`${scope}/registry`)
+
+  if (scopedRegistry) return scopedRegistry
+
+  return conf.get('registry') || 'https://registry.npmjs.org/'
+}