Merge pull request #28 from spmjs/fix/install

fix(install) 前置 info 查询

Author: sorrycc

lib/install.js

@@ -85,6 +85,9 @@ function* installPackage(id, args, saveDeps) {
   log.info('install', color.magenta(pkgId));
   debug('start install package %s', pkgId);
 
+  var pinfo = yield* info(idObj, args);
+  pkgId = pinfo.name + '@' + pinfo.version;
+
   // The package has downloaded in dest
   // always false when version is not empty
   if (existInDest(idObj, args)) return;
@@ -94,9 +97,6 @@ function* installPackage(id, args, saveDeps) {
     debug('package %s has been in downloadlist', pkgId);
     return;
   }
-
-  var pinfo = yield* info(idObj, args);
-  pkgId = pinfo.name + '@' + pinfo.version;
   args.downloadlist[pkgId] = pinfo;
 
   // save dependencies to package.json